Gpo

“GPO” SERIES

GAS-OVER-OIL ACTUATORS

Contents may change without notice

Foreword pag. 1Quality Assurance pag. 2

GPO Gas-over-oil Actuator

1. General Information on the Scotch-Yoke Mechanism pag. 32. GPO Assembly pag. 43. Housing and Cylinder pag. 54. Scotch-Yoke Mechanism pag. 65. Cylinder pag. 76. Gas-over-oil Tanks pag. 77. Working Principle pag. 88. Valve Position Indication pag. 99. Actuator Control System pag. 10

10. Speed Control pag. 1311. Emergency Hydraulic Manual Operation pag. 1312. Assembly of Actuator onto Valve pag. 1313. Actuator Power Supply pag. 1414. Final Testing pag. 15

GPO Performances Tables pag. 16

GPO Technical Data pag. 18

15. Sizing of Gas-over-oil Actuators pag. 2416. Gas-over-oil Actuators "HYGLA" for Linear Valves pag. 24

Overall Dimensions pag. 25

GPO Enquiry and Ordering Data pag. 33

Explosion-proof Certificates pag. 34

Table of Contents

� Copyright by BIFFI Italia. All rights reserved. BIFRM-0023-EN-0401A !@#$ INTERNATIONAL LTD. COMPANY

1

Foreword

The actuator execution for EUROPEANdestinations is in accordance with thefollowing European Directives:• Machinery Directive 8973/23 EC, 93/368• Low Voltage Directive EC/392, 91/368 EC• Electro-magnetic compatibility

Directive 89/336 EC, 92/31 EC• ATEX 94/9/EC Directive• “PED” Pressure Equipment Directive

97/23 EC

Biffi GPO gas-over-oil actuators havebeen produced for more than 40 yearsand through a continuous process ofengineering and manufacturing theynow represent a precise reference pointfor every company in the gas pipelinesvalve automation market.The experience and the knowledgeacquired in the actuator industry allowBiffi to satisfy the most specific needs of Customers worldwide.The reliability and high productionquality enabled Biffi to continuouslyexpand the market and to become aworld leader universally recognised bythe most important oil, gas andengineering companies.

Gas-Over-Oil Actuator

Contents may change without notice � Copyright by BIFFI Italia. All rights reserved. BIFRM-0023-EN-0401A !@#$ INTERNATIONAL LTD. COMPANY



2

Quality Assurance

carried out, highlight all possible criticalpoints inside the organisation, and thusmake it possible to take the necessarycorrective actions and to optimise theavailable resources.It is a guarantee for the Customer as thecontrol of every phase of the productioncycle, from the quotation to the invoice,is performed within a controlled anddocumented system.

The Biffi Quality control System isorganised through a network ofpersonal computers interfaced to themain frame. This computerised systemguarantees the correct information flowthrough all the departments. It alsoguarantees a uniform and regularmethod to automatically andsystematically check all the Company'sactivities.

The GPO calculations are approved byLloyd Register (Machinery GeneralDesign Appraisal) according to S.I, N° 825,pipeline Safety Regulation.All GPO actuators are individually testedand EN 10204.3.1B certified.

Biffi has designed and implemented aQuality Assurance System inaccordance with European standardEN-29001 (ISO 9001). The QualityAssurance System defines thecompetence, the purpose and theprocedures related to each companydepartment.Biffi Italia is certified for theEnvironmental Managment System inaccordance with ISO – EN 14001Biffi Italia is also assessed byAchilles/First Point Organisation.

The Quality Assurance System is theinstrument for monitoring the productionprocess and the quality of the relevantservices. Biffi Quality System ensures thefollowing advantages: it is a guaranteefor Biffi, as the various tests, which are

3

1. General information on the scotch-yokemechanism

Biffi gas-over-oil actuators, "GPO" seriesfor normal temperature (-30° to +80°C)or for low temperature (-60° to +80°C),are normally manufactured with acanted scotch-yoke mechanism. Thetorque curve developed by this type ofactuator is most suitable to operatequarter-turn valves, particularly ballvalves.

Fig. 1 shows the diagrams, as a functionof the angular position, of the typicalrequired torque of a ball valve both inopening and in closing, and the outputtorque of a canted scotch-yokemechanism.Fig.1 also shows the comparisonbetween the output torque curves of acanted and a symmetric scotch-yoke

mechanisms, and of a "constant torque"actuator (i.e. Rack & Pinion type). These graphs demonstrate that, sincethe arm length and the cylinder diameterare the same, canted scotch-yokeactuators have the most suitablemechanism, both for technical andeconomical reasons, to operate quarter-turn valves.Biffi can anyway provide symmetricscotch-yoke actuators for specialapplications as low pressure ball valvesor plug valves.- Special modules for remote

communication via bus (Modbus orother protocols) are available.

- Special power supply of solenoidvalves and electronic line break controlwith solar panel is also available.


2,5

1,5

1,0

2,0

2,5

1,5

1,0

2,0

Torq

ue

0°Closed

90°Open

45°Angularposition

c

d

e

a

b

Notes

a) valve opening torque b) valve closing torque c) actual actuator output torque

(canted design)d) actual actuator output torque

(symmetric design)e) output torque of a constant torque

actuator


Fig. 1




4

2. GPO Actuator assembly

Control group

Housing with scotch-yoke mechanism

Junction box

Flow controlvalves

Hydraulic cylinder

Mechanicalstopper

Mechanicalstopper

Hydraulic manual override

Gas-over-oil tanks

3. Housing and cylinder

1 Housing Carbon steel2 Yoke Carbon steel3 Bushing Bronze4 Cover Carbon steel5 Block pin Alloy steel6 Sliding block Bronze7 Guide block Carbon steel8 Guide bar Alloy steel (hard chrome plated)9 Bushing Bronze

10 Cylinder tube Carbon steel (ENP)11 Piston rod Alloy steel (hard chrome plated)12 Bushing Bronze13 Piston Carbon steel14 Guide ring Teflon® + graphite

Teflon® is a registered trade mark of E.I. DuPont de Nemours & Company

Item Name Material of construction

5




12

3

56

24

1

101413

11

8

79



4. Scotch-yoke mechanism

The yoke has a bore with keyways tocouple the valve stem, the dimensionsof which are according to Biffi standardtables. On request Biffi can supply aninsert bush with machined orunmachined bore according to thedimensions of the valve stem.The yoke receives the thrust of thecylinder from the block pin (5) by meansof the bronze sliding blocks (6) whichmove inside the slots of the yoke arms.The block pin is mounted in the guideblock (7) where the threaded end of thecylinder piston rod is screwed.The guide block slides along the guidebar (8) by means of the bushing (9)made of sintered bronze charged withteflon.The bushing guarantees a very lowfriction coefficient.

The scotch-yoke mechanism shown inFig.4 transforms the linear movement ofthe hydraulic cylinder into a 90° rotation.The housing (1) in fabricated carbonsteel provides for the coupling of theactuator to the valve flange and thesupport of the hydraulic cylinder; itencloses the scotch-yoke mechanismand together with the cover provides the mechanical protection. For the coupling to the valve, thehousing is provided with a flange withthreaded holes and dimensionsaccording to the Biffi standard tablesSCN 6200 and SCN 6201 (see pages28 and 29). If required, Biffi can supplyan adaptor flange machined accordingto the valve coupling dimensionsprovided by the Customer.The yoke (2) during its rotation iscontained by bronze bushings (3): one isassembled in the flange of the housing,the other in the cover (4).

The guide bar withstands the transversalforces originated by the angle betweenthe surface of the slots and theperpendicular to the piston rod axis.In this way the piston rod is not loadedwith transversal forces, thus not wearingits guide bushing and its ring sealswhich are assembled in the head flangeof the hydraulic cylinder.The bronze material used in the slidingparts guarantees a high efficiency of themechanism.The angular stroke of the yoke isadjustable between 82° and 98° bymeans of the mechanical stops screwedinto the end flange of the hydrauliccylinder (closed valve) and into the leftside of the housing (open valve).In case of an actuator with twocylinders, both mechanical stops arescrewed into the end flanges of thecylinders.

Fig. 4 – Canted scotch-yoke mechanism Fig. 4.1 – Canted scotch-yoke mechanism in open positionFig. 4.2 – Canted scotch-yoke mechanism in intermediate positionFig. 4.3 – Canted scotch-yoke mechanism in closed position

Fig. 4.1

Fig. 4

Fig. 4.2

Fig. 4.3

6 Contents may change without notice



7

The tanks can also be supplied in accordance with PED EuropeanDirective 97/23 EC, or other Codes on request.

The gas-over-oil tanks are used toseparate the feeding gas from thehydraulic cylinder.A dipstick screwed into the uppernozzle of the tank is used to check theoil level. In the bottom part of the tank is the hydraulic filter. The tanks arenormally engineered, manufactured andtested according to ASME VIII-DIV. 1.

6. Gas-over-oil tanks

5. Cylinder

Piston seals Piston rod seals

bushing (12). This guide bushing hassurface contact with the piston rod inbronze charged with teflon andguarantees a very low frictioncoefficient. The piston (13) slides inside the cylindertube and is guided by a teflon ring (14)which guarantees a high efficiency.

The cylinders of gas-over-oil actuatorsare engineered and manufactured to beused in hydraulic service. Special careis taken to provide a smooth internalsurface of the cylinder tube (10) byhoning it. The piston rod (11) slides inside thebore of the head flange guided by the

The piston and piston rod seals aremade by teflon rings precharged by ano-ring made of the most suitablecompound for the severest workingconditions.



8

7. Working principle

The gas-over-oil actuator is fed bypressurised gas which, after beingfiltered, flows through the control valvesinto the tank relevant to the operation(opening or closing) to be performed.The hydraulic oil contained in the tank ispressurised by the gas and flows intothe relevant cylinder chamber, while theoil contained in the other chamber flowsinto the second tank. The cylinderpiston stroke causes the actuatoroperation.

LATVIAN GAZE, 28” ball valve with GPO

The oil flow from the cylinder into thetanks is adjusted by means of two flowcontrol valves. In this way it is possibleto adjust the stroking time of theactuator.Emergency manual override can beperformed by selecting the opening andclosing operation by means of the handactuated directional control valve andthen actuating the handpump.

SAMSUN Station TURKEY 16” ball valves with GPO



9

8. Valve position indication

In the upper part of the standard Biffilimit switches enclosure there is a localposition indicator, which shows theposition of the valve along the angularstroke.When a remote continuous signalling ofthe position of the valve is required, theactuator is supplied with a positiontransmitter in accordance withCustomer requirements.If limit switches are not required, a localmechanical position indicator isprovided in the upper part of the yoke,for the continual indication of theposition of the valve.

If required, the actuator can be suppliedwith electric limit switches which can beadjusted along the complete angularstroke of the valve. The limit switchescan be provided in different typesaccording to Customer requirements:sealed, with contacts in inert gasatmosphere, with gold contacts,magnetic, proximity type etc. Whenpossible, because of dimensions,quantity and characteristics, the limitswitches are enclosed in a weather-proof IP 68 according to IEC 529 andEN 60529 and explosion-proofenclosure, which meets the ATEXEuropean standard with a compliancecertificate issued by an approvedLaboratory.

Fig. 6 - Internal view of the electriclimit switches enclosure

Fig. 7 - Local mechanical position indicator

9. Actuator control system

The pneumatic valves in alluminium alloyare poppet-type in order to providebubble tightness. The sealing seats aremade of teflon, thus granting chemicalresistance, lack of sticking and agingeffects and the highest compatibility withevery environment condition. The basiccontrol system of the Biffi gas-over-oilactuator mainly consists of a double 3-way 2-position control valve, which isnormally piloted by 2 solenoid valves forremote control, one for closing and onefor opening. It is also possible to locallyoperate this valve by means of 2 levers,one for closing and one for opening.

Biffi has produced a wide range ofpneumatic and hydraulic componentsspecifically engineered to suit the mostvarying needs of the customer(i.e. control mode, emergencyoperation, working temperature range,pressure range of the gas supply etc.).These components guarantee a highreliability and compact design.Every pneumatic valve is engineered towork with high pressure gas. Therefore the control group does notneed to be fed by means of a pressurereducer. In this way the reliability of thesystem is increased.

Fig. 8 - Control system completewith solenoid valves

10




The junction box, where all the wiringcoming from the actuator electriccomponents and from the remotecontrol panel are connected, can besupplied complete with a local / remoteselector.

The solenoids enclosures and thejunction box are weather- andexplosion-proof in accordance withATEX standard (compliance certificateissued by approved Laboratory).The Biffi control system is also certifiedby FM (U.S.A.), A.S. (Australia) andGosgortechnadzor-EX-D (Russia).The pneumatic control valves areenclosed in a weather-proofpadlockable enclosure.

Biffi can supply different types of controlsystems following customerrequirements.

Fig. 9 - Control system complete with solenoid valves and "LINE BREAK" device



11

The "ESD" device automatically opensor closes the actuator when thepressure or the pressure valueis outside the normal range ofvalues. The pressure switch can eitherbe pneumatic or electric. A typicalexample of "ESD" device is shown inschematic drawing 4, page 21.

A typical example of "LINE BREAK"device is shown in schematic drawing 6,page 23.In case the control signal is also presentat the end of the manoeuvre like for the"ELECTRIC FAIL SAFE" system (seeenclosed schematic drawing 5, page22) and for the "ESD" device, theactuator can be provided with

The actuator control can be made withone or more electric signals or bymeans of low/high pressure pneumaticsignals.Automatic control groups for theactuator operation (in opening or inclosing) are also available. The "ESD"and the "LINE BREAK" devices aretypical examples.The standard LINE BREAK control iscompletely autonomous, not dependingon other power/control sources.The "LINE BREAK" device automaticallycloses the actuator when the pressuredrop rate exceeds a preset value.Special versions of LINE BREAK controlfor sour gas, liquid fluids, dirty and veryhumid natural gas are also available.

pneumatic limit switches which causethe exhaust of the gas used for theoperation at the end of the actuatormanoeuvre. In this way the gas-over-oil tanks and allthe hydraulic components are onlypressurised during the actuatoroperation.

Fig. 10 - Control system complete with solenoid valves and "LINE BREAK" device

Pneumatic line break system

Electric signals

Line break pressure system

16 16

8

19

3 11G

C

K

H L

D

BFE

2

13

20

torque exceeds the preset value.When the gas supply to the actuator isnot always available, a storage tankengineered and manufacturedaccording to the applicable code andworking conditions is provided. The tankis equipped with the requiredaccessories: safety relief valve, pressuregauge, stop valve, drain valve, etc.For heavy duty service or when requiredby the Customer, the control valves canbe supplied in a special execution(materials or design not standard), forinstance pneumatic valves according toNACE standard for sour gas service.For any particular requirements it isadvisable to contact Biffi sales offices,which will provide the most suitable andconvenient solutions to the variousneeds.

GPO actuator with ELECTRONIC LINE BREAK Control

An electronic version of the LINEBREAK control is also available.

A pressure reducer or a "TORQUELIMITING DEVICE" (Biffi patent) can besupplied, when the gas supply pressurevaries in a wide range and when theactuator output torque must not exceeda fixed value in order not to damage thevalve.The pressure reducer limits the outputtorque of the actuator by reducing thegas supply pressure at a preset value.The "TORQUE LIMITING DEVICE"consists of 2 pressure piloted valves,one for each gas-over-oil tank, whichstop the gas flow coming from thepneumatic control valves of the actuatorand exhaust the gas enclosed in thegas-over-oil tanks when the output

12




Fig. 11 - Torque limiting device



13

The Biffi gas-over-oil actuator is suppliedwith handpump and a 4-positiondirectional control valve to operate thevalve in emergency conditions in case ofgas supply failure.The directional control valve has 4 positions:automatic, close, open and by-pass.

The speed of actuator operation isadjusted by controlling the oil flow fromthe cylinder to the gas -over-oil tanks bymeans of 2 flow control valves.These valves are mounted on thepump-distributor group.

The Biffi insert bush with 2 externalkeys at 45° allows to position thekeyway for the valve every 90°.Consequentely actuator can be mountedin 4 positions at 90° on top of the valve.

For the biggest actuator models, the bore of the yoke can be machinedaccording to the dimensions of the valvestem.

In "automatic" position the handpump isoverridden, since in this case theactuator works by means of the gassupply. The "close" and "open" positionsallow to operate the actuator byactuating the handpump.The "by-pass" position allows for

For coupling to the valve, the housing isprovided with a flange with threadedholes according to Biffi standard tablesSCN 6200 and SCN 6201 enclosed(pages 28 and 29).

The number, dimensions and diameterof the holes are made in accordancewith ISO 5211, but for actuator models0.3 to 6 the holes are drilled on thecenterline in order to allow an easierassembly of an intermediate flange,when required. This intermediate flangecan be supplied when the valve flangecan not directly match the actuatorflange in its "standard" configuration.For the biggest actuator models, theactuator flange can be machined inaccordance with the valve flangedimensions.The yoke has a bore with keyways forcoupling to the valve stem, thedimensions of which are according toBiffi standard tables SCN 6200 andSCN 6201.

If required, for the standard models size0.3 to 6, Biffi can supply an insert bushwith unmachined bore in accordancewith Biffi standard table SCN 6202enclosed (page 31). On request theinsert bush bore can be machined byBiffi to couple the valve stem, providedits dimensions match the maximumstem acceptance of the bush accordingto Biffi table TN 1005, enclosed (page 32).The particular execution of the flangeand bushing allow the actuator to berotated by 90° in 4 different positionsaccording to the following figure.

Fig. 13: Hand pump with directionalcontrol valve and flow control valve

Insert bush turned upside down

They are unidirectional and allowindependent adjustment of the strokingtime both in closing and opening.By acting on the oil flow and not on thegas, it is possible to be more accurate inthe speed adjustment, thus granting asmoother stroke of the actuator.

Rotation 180°Around verticalBase position

Rotation 180°Around axis

A-A from pos. (2)

Rotation 180°Around axis

A-A from pos. (1)

Housing

Insert bush (1)

Drive sleeve

Snap ring

Adaptor flange

FLOW LINE

Drive sleeve

Insert bush (1)

N.4

ho

les

flang

eN

.8 h

ole

s fla

nge

A

A

A

A

A A

AA

Pos.(1)

Pos.(2) Pos.(3) Pos.(4)

balancing the level of the oil contained inthe 2 gas-over-oil tanks.A special execution assuring the priorityof the remote operation is also available.

11. Emergency hydraulic manual operation

10. Speed control

12. Assembly of actuator onto the valve

Housing with scotch-yoke mechanism - Insert bush arrangement in 4 positions at 90°.

13. Actuator power supply

The advantage of the Biffi gas-over-oilactuator is that it functions with the gasflowing in the pipeline without requiringanother power source supply.Each actuator is also provided with aconnection port to be fed by a separatesupply line from a gas storage unit or bybottled gas.

The Biffi gas-over-oil actuator is suppliedwith a filter to avoid the entrance ofparticles which might prevent the properworking of the pneumatic components.In case of wet gas, Biffi can supply afilter-condensate separator-dehydratorunit.

The Biffi gas-over-oil actuator isengineered and manufactured to workwith a pressure supply varying from 7bar to 105 bar (from 100 psi to 1500psi). Biffi can also provide actuatorsworking at pressure supply valuesoutside the above range.

14




14. Final testing

measure various actuators parameterslike the output torques, the values ofwhich are written on the test certificateattached to each actuator. The tests arecarried out in accordance with Biffiinternal specifications and they can beintegrated with additional tests inaccordance with Customerrequirements.

These tests can be witnessed by thirdparty authorities or by the Customer, inaccordance with contractual terms.

It is very important to point out that Biffitests 100% of the actuators. In order todo so, Biffi testing department isequipped with sophisticated test rigswhich allow to check the correctworking of the actuator with all theforeseen control modes.The testing department is also equippedwith electronic devices which allow to

15



Gas-Over-Oil ActuatorGPO actuators performance tables


16

1. * standard models2. Max allowable pressure 100 bar

(static pressure applicable to fullystroked actuator against the travel stops)

3. for Symmetric yoke, please changeC with S

Notes

Fig. 14 - Typical GPO configuration

Canted yoke Symmetric yokeActr Max operating Output torque Output torque Output torque Output torque Output torqueModel torque (Nm) at 45° (Nm/bar) at 0° (Nm/bar) at 90° (Nm/bar) at 0° (Nm/bar) at 90° (Nm/bar)*3.3C-75 3000 22 64 31 40 38*0.3C-100 3000 41 115 57 73 69*0.9C-100 9000 47 132 65 85 80*0.9C-135 9000 87 243 120 154 146*1.5C-135 15000 108 304 150 212 169*1.5C-175 15000 184 512 255 356 287*3C-135 30000 176 493 244 346 285*3C-175 30000 298 829 412 582 482*6C-175 60000 348 970 482 679 565*6C-200 60000 451 1320 624 887 732*6C2-200 60000 947 2419 1311 1695 153614C-235 120000 700 1912 969 1360 111514C-280 120000 996 2715 1379 1931 158814C2-235 120000 1448 3700 2005 2631 230914C2-280 120000 2059 5261 2851 3741 328218C-235 180000 805 2197 1114 1564 128318C-280 180000 1146 3122 1586 2220 182718C2-235 180000 1666 4255 2306 3025 265618C2-280 180000 2368 6050 3278 4300 415232C-235 300000 955 2616 1323 1812 152932C-280 300000 1360 3707 1883 2573 217732C2-235 300000 1978 5052 2738 3506 316532C2-280 300000 2812 7183 3892 4984 449950C-235 400000 1073 2934 1486 2013 169950C-280 400000 1528 4165 2116 2858 241950C-300 400000 1739 4782 2407 3281 275150C2-235 400000 2198 5614 3042 3895 351750C2-280 400000 3124 7981 4325 5538 499950C2-300 400000 3568 9121 4943 6329 5713

GPO actuators performance table

17



Fig. 16 - GPO 6S-200 complete with "TORQUE LIMITING DEVICE"

Fig. 15 - GPO bi-cylinder actuator complete with "LINE BREAK" device

Actuator Oil Gas Tank Hand pump Oilmodel displacement consumption capacity operations content

(lt.) (lt.) (lt.) per stroke (lt.)0.3C*-75 0.7 1.6 4.3 38 8 0.3C*-100 1.2 2.7 4.3 65 7.6 0.9C*-100 1.4 3.2 7.5 76 13.5 0.9C*-135 2.4 5.2 7.5 130 13 1.5C*-135 3 6 7.5 162 12.5 1.5C*-175 5 9 12 270 20 3C*-135 5 9 19 270 33 3C*-175 8 14 19 432 33 6C*-175 10 17 24 392 40 6C*-200 12 20 24 470 40 6C*2-200 24 40 49 470 80 14C*-235 18 30 35 706 60 14C*-280 26 42 50 1020 85 14C*2-235 36 59 75 706 120 14C*2-280 51 84 96 1020 170 18C*-235 21 34 40 824 70 18C*-280 30 48 60 1176 100 18C*2-235 41 68 82 824 135 18C*2-280 59 97 123 1176 190 32C*-235 25 40 50 980 80 32C*-280 35 57 75 1372 115 32C*2-235 48 80 96 980 160 32C*2-280 68 113 130 1372 220 50C*-235 27 44 60 1060 90 50C*-280 39 3 82 1530 130 50C*-300 45 72 96 1765 150 50C*2-235 52 85 96 1060 170 50C*2-280 76 125 140 1530 250 50C*2-300 88 144 171 1765 290

GPO actuators technical data

For Symmetric yoke, please change Cwith S

Note

Pneumatic connectionHydraulic connection

11

1

Electricconnection to

microswitches

C

3-O

4-O4-C9

10

8

7

6

Gas exhaust

Auxiliary gassupply connection

DWG 1 - Local control

Gas supplyconnection

Close

Open

5

2

A

B

5

3-C

E.M.

PC PO

DC DO

Gas-Over-Oil ActuatorGPO actuators technical data


18

1 Double-acting gas-over-oil actuator2 Hydraulic manual override

A – HandpumpB – Adjustable relief valveC – Hand-operated directional control valve

3 Unidirectional flow regulator (adjustable setting)4 Gas-hydraulic tank5 Hydraulic filter6 Stop valve7 Gas filter/Condensate separator8 Dust excluder with check valve9 Control valves enclosure with vent valve

10 Double 3/2 n.c. hand-operated/spring-return valvePC – 3/2 n.c. hand-operated/ spring pilot valve (to close)PO – 3/2 n.c. hand-operated/spring pilot valve (to open)DC – 3/2 n.c. pneumatic pilot/spring-return valve (to close)DO – 3/2 n.c. pneumatic pilot/spring-return valve (to open)

11 Electric microswitches

Item Name

Note

Local controlPress lever of valve 10-PO to open or10-PC to close with power supply

Manual operationSelect by the valve 2C the opening or closing operation and actuate the hand pump 2A

The operating diagram is drawn withcontrol valves not actuated

19



DWG 2 - Local and remote control

Pneumatic connectionHydraulic connectionElectric connection




10 Double 3/2 n.c. solenoid valve with manual overridePC – 3/2 n.c. pilot solenoid valve, manual override (to close)PO – 3/2 n.c. pilot solenoid valve, manual override (to open)DC – 3/2 n.c. pneumatic pilot/spring-return valve (to close)DO – 3/2 n.c. pneumatic pilot/spring-return valve (to open)

11 Electric microswitches12 Terminals enclosure

Electric remote controlEnergize solenoid valve 10-PC to closeor 10-PO to open the actuator, during allthe valve stroke.Solenoid valves must be de-energizedat the end of the actuator operation.

Local control Press lever of valves 10-PO to open and 10-PC to close with power supply

Manual operation Select by the valve 2C the opening orclosing operation and actuate the handpump 2A

Item Name

10

9 4-C 4-O

5 5

3-C3-O

2

Gas exhaust

6

7 812

T.E.

Open

Close

Note


Electric connectionto solenoid valves

and microswitches

DC DO

POPC

C

1

11E.M.





20






11 Electric microswitches12 Terminals enclosure13 Torque limit switch

Item Name

Note


Close

Open

8

6

7

DC DO

DWG 3 - Local and remote control, torque limiting device

Electric remote controlEnergize solenoid valve 10-PC to closeor 10-PO to open the actuator, during allthe valve strokeSolenoid valves must be de-energizedat the end of the actuator operation

Local control Press lever on valves 10-PO to open or10-PC to close with power supply


Torque limiting deviceWhen the actuator output torqueexceeds the set value, the torquelimiting switch 13 stops the gas flow tothe relevant gas-hydraulic tank 4, andthe enclosed gas is exhausted


Electric connectionto solenoid valvesand microswitches

Gas exhaust


12

11

1

9

10

T.E.

POPC

E.M.

C

3-C3-O

5

2

5

13-O13-C

4-C 4-O

A

B

21



OpenClose9

4-C 4-O

2

5A

B

5

3-O 3-C

1

11

8





11 Electric microswitches12 Terminals enclosure13 Mechanical filter14 Check valve15 Gas storage tank16 Needle valve17 Pressure gauge18 Relief valve19 Manual drain valve20 N.o. pneumatic pressure switch (adjustable setting)21 3/2 n.o. cam-actuated/spring-return valve22 3/2 n.o. pneumatic pilot/hand-return valve23 Higher pressure shuttle valve

Item Name

Note

The operating diagram is drawn forsolenoid valves coils not energized, lowpressure in the ESD device pilot line,and no pressure in the gas supply lineand into the storage tank

Electric remote controlEnergize solenoid 10-PC to close or 10-POto open the actuator during all the valvestroke. Solenoid valves must be de-energized at the end of the actuatoroperation.

Local operationPress lever of valves 10-PO to open or 10-PC to close with power supply

Manual operation Select by the valve 2C the opening or closing operation and actuate the handpump 2A

Emergency shut downoperation The pressure to be controlled is connectedto the pressure switch (20) pilot.When the pressure decreases below theset point of the pressure switch (20), apressure signal pilots the valve (22) toinhibit opening operation and power valve(10-PO) causes the actuator closing.The pilot pressure must be re-establishedand the opening operation inhibitionvalve must be manually reset before theactuator can be reopened

DWG 4 - Local and remote control, emergency low pressure shut down

C

E.M.

T.E.127

Gasexhaust

Auxiliary gassupply connection Electric connection

to solenoid valvesand microswitches

Esd devicepilotconnection

* = Optional

6B

21

22

20

10

23PO

DCDO

PC

18* 15*19*

17*16* 14*

13* 6A Gas supplyconnection Pneumatic connection

Hydraulic connectionElectric connection




22




10 Double 3/2 n.c. hand-operated/spring-return valvePC – 3/2 n.c. hand-operated/ spring pilot valve (to close)PO – 3/2 n.c. hand-operated/spring pilot valve (to open)DC – 3/2 n.c. pneumatic pilot/spring-return valve (to close)DO – 3/2 n.c. pneumatic pilot/spring-return valve (to open)

11 Electric microswitches12 Terminals enclosure13 Mechanical filter14 Check valve15 Gas storage tank16 Needle valve17 Pressure gauge18 Relief valve19 Manual drain valve20 3/2 hand-operated valve21 3/2 n.o. solenoid/spring-return pilot valve22 3/2 n.o. pneumatic pilot/spring-return valve23 Higher pressure shuttle valve24 3/2 n.o. cam-actuated/spring-return valve

Electric remote controlEnergize solenoid 21 to open, de-energize to close the actuator: in case of electric supply failure theactuator moves automatically in closing At the end of actuator strokes the valves24 are actuated and cause the exhaustof the gas utilized for the operation

Local control Move the valve 20 to “local operation”Press lever on valves 10-PO to open or10-PC to close with power supply

Manual operation Move the valve 20 to “local operation”Select by the valve 2C the opening orclosing operation and actuate the handpump 2A

Item Name

24-C

DC DO

Note

The operating diagram is drawn forsolenoid valve coil not energized, nopressure in the gas supply line and intothe storage tank, valve in intermediateposition

DWG 5 - Local and remote control, electric fail safe

1

11128

20

22

21

5

2

5

3-C3-O

24-O

910

23 23

T.E.

18*

17A*16A*

* = Optional

15*19*14*

13*

E.M.

16B

17B

Gas exhaust Electric connectionto solenoid valveand microswitches

Auxiliary gas supplyconnection

Gas supplyconnection6

7

POPC4-O4-C

C

CloseOpen

23







11 Electric microswitches12 Terminals enclosure13 Mechanical filter14 Higher pressure shuttle valve (double check valve)15 Gas storage tank16 Needle valve17 Pressure gauge18 Relief valve19 Manual drain valve20 3/2 n.o. pneumatic pilot/hand-return valve21 Shuttle valve device

A – Check valveB – Low pressure vent valveC – Stop valve for pressure gaugeD – Pressure gaugeE – 2/2 hand-operated valveF – Higher pressure shuttle valve

22 2/2 n.c. diaphragm pilot valve (adjustable)23 Check valve with orifice for line break device

A – Check valve with orificeB – Stop valve

24 Reference tank for line break device

Item Name

Note


DWG 6 - Local and remote control, line break device


Electric remote controlEnergize solenoid valve 10-PC to closeor 10-PO to open the actuator, during allthe valve strokeSolenoid valves must be de-energizedat the end of the actuator operation

Local control Press lever on valves 10-PO to open or10-PC to close with power supply


Line break operationA rate of pressure drop in the pipelinecauses a differential pressure acrossthe diaphragm valve 22. When thedifferential pressure is higher than thepreset value, the diaphragm valve 22trips and pilots the valve 20 to inhibitopen operation and the power valve10C causes the actuator to close.After the line break intervention, theinhibition valve (20) must be manuallyreset before the actuator can bereopened.The line break pilot has to be connectedto the pipeline (downstream the valve)and the pressure intake has to beseparate from the gas supply pressureintake

21 22

* = Optional

E

A

BC

F

108

97A T.E.

6C

B

5 5

2

1

3-O

4-C 4-O

7B

12

PC PO

DODCGasexhaust

17*16*

18* 15*19*

14*

13A* 6A*

13B*6B*

A

2324L.B.

L.B. Devicetest ports

Line breakdeviceconnection

Auxiliarygas supplyconnection

3-C

A

B

C

11E.M.

Gas supply connection(upstream the valve)

Gas supply connection(downstream the valve)

Electric connection to solenoidvalves and microswitches

CloseOpen



24

15. Sizing of gas-over-oil actuatorsUsually the most critical situation for theactuator is the running torque of thevalve when the minimum pipelinepressure is available.Only when the gas supply is taken froman indipendent source (separatepipeline, emergency tank, separatecontrol system) the actuator with theminimum supply pressure must be ableto move the valve with the maximum DP.

Particular attention must be payed tothe opening of vent valves and by-passvalves, generally of small size. In this

case the gas speed and the DP acrossthe valve generate a significant dynamictorque to close the valve not only nearto the closing position, but along thevalve stroke. The valve makers mustcarefully evaluate this situation andprovide the correct torque values for thereal operating condition of the valve. The rule of thumb for this application isto consider the actuator supply atminimum pressure (i.e. 25 barg) to movethe valve with the max DP (i.e. 100 barg).

Normally the power gas for GPOactuator feeding is taken directly fromthe gasline. This means that thepressure of the gasline is the same usedby the actuator. Being the pipelinepressure normally not constant, aminimum and a maximum value of thepipeline pressure is defined by thetechnical specifications.With the minimum pressure the actuatormust move the valve with the minimum∆P. With the maximum pressure theactuator must move the valve withmaximum ∆P.

quarter-turn actuators GPO.Proper pedestals with flanges andadjustable stem joint to meet the valvetop mounting design are normallysupplied.

In order to keep the valve in position,the control systems usually include the

hydraulic locking device with doublepiloted check valves with thermal relieffunction or mechanical lock piloted bythe power gas.

For the motorisation of linear valves, asthrough-conduit gate valves frequentlyused in the gas pipelines, BIFFI can also propose the proper gas-over-oilactuators of the “HYGLA” series.

HYGLA actuators utilise the same high-pressure controls used for

16. Gas-over-oil actuators “HYGLA” for Linear Valves

25

Gas-Over-Oil Actuatoroverall dimensions drawing


Dimensions in mm

t u Ø Coupling Weightdwg (Kg)

332 300 102 125332 300 102 140367 377 142 170367 377 142 190367 377 142 210367 377 142 250438 337 168 390438 337 168 410

Actuator A B C a b c d e f g h i l m n o p q r smodel0.3•-75 947 615 862 515 268 186 427 147 72 790 200 319 222 532 292 221 189 345 70 1550.3•-100 969 615 862 515 268 186 427 147 72 790 200 319 222 554 292 221 189 345 70 1550.9•-100 1043 681 829 551 304 222 463 147 12 817 243 342 245 593 315 244 250 393 80 1850.9•-135 1110 681 829 551 304 222 463 147 12 817 243 342 245 660 315 244 250 393 80 1851.5•-135 1152 742 829 552 305 223 464 147 11 818 284 362 293 702 335 264 270 413 100 1851.5•-175 1213 742 1157 552 305 223 464 147 11 1146 284 362 293 763 335 264 270 413 100 1853•-135 1555 917 1313 565 318 234 476 147 20 1293 371 443 391 1032 416 345 319 493 160 2353•-175 1623 917 1313 565 318 234 476 147 20 1293 371 443 391 1100 416 345 319 493 160 235

SCN6200

a

y

A

l m

ut

X

p

qr

B

n

o

Exhaust

z z

ed

fg

C

w

h i

Lifting points

cb

Notes

X = 1/2 NPT gas supply connectionY = 1/4 NPT emergency gas supply

connectionW = 1 NPT electric connectionZ = 25 mm lifting holes diameterWeights are referred to base

construction (without adaptor)• = C For canted yoke

S For symmetric yoke

TN 1037-1



26

Dimensions in mm


478 90 219 515478 90 219 550501 0 219 950501 0 219 1320726 0 219 1190726 0 273 1430890 0 219 1580890 0 273 1820900 42 273 1800900 42 355 2120900 42 355 2290

Actuator A B C a b c d e f g h i l m n o p q r smodel6•-175 1785 1160 1120 602 355 271 512 202 77 1043 480 279 430 1154 241 170 398 680 185 4556•-200 1855 1160 1120 602 355 271 512 202 77 1043 480 279 430 1224 241 170 398 680 185 455

14•-235 2098 1223 1475 715 468 384 618 202 59 1416 543 392 496 1252 354 283 381 660 200 63014•-280 2098 1223 1865 715 468 384 618 202 59 1806 543 392 496 1252 354 283 381 660 200 63018•-235 2255 1230 1525 729 482 398 682 202 37 1488 550 456 564 1355 418 347 384 870 230 63018•-280 2255 1230 1400 729 482 398 682 202 37 1363 550 456 564 1355 418 347 441 870 230 63032•-235 2446 1548 1865 750 503 419 703 202 80 1785 660 430 610 1556 392 321 543 920 270 63032•-280 2446 1548 1850 750 503 419 703 202 80 1770 660 430 610 1556 392 321 570 920 270 63050•-235 2610 1825 1540 780 533 449 733 202 92 1448 685 355 698 1700 317 246 551 1140 300 86050•-280 2610 1825 1400 780 533 449 733 202 92 1308 685 355 698 1700 317 246 592 1140 300 86050•-300 2610 1825 1500 780 533 449 733 202 92 1408 685 355 698 1700 317 246 592 1140 300 860

SCN6200

SCN6201-1

SCN6201

Notes





a

y

Ø

A

l m

t

X

p

q

r

B n o

Exhaust

ed

fg

C

w

h i

Lifting points

Lifting points

c

b

u

s

TN 1037-2

27



Dimensions in mm


478 90 273 700501 0 273 1400501 0 356 1620726 0 356 1550726 0 356 1800890 0 356 1950890 0 356 2220900 42 356 2220900 42 457 2480900 42 457 2700

Actuator A B C a b c d e f g h i l m n o p q r smodel6•-2-200 2396 1160 1290 602 355 271 512 202 77 1213 480 279 1172 1224 241 170 425 680 185 455

14•2-235 2445 1223 1842 715 468 384 618 202 59 1783 543 392 1193 1252 354 283 410 660 200 63014•2-280 2445 1223 1400 715 468 384 618 202 59 1341 543 392 1193 1252 354 283 452 660 200 63018•2-235 2642 1230 1225 729 482 398 682 202 37 1188 550 456 1287 1355 418 347 452 870 230 63018•2-280 2642 1230 1737 729 482 398 682 202 37 1700 550 456 1287 1355 418 347 452 870 230 63032•2-235 3032 1548 1400 750 503 419 703 202 80 1320 660 430 1476 1556 392 321 570 920 270 63032•2-280 3032 1548 1824 750 503 419 703 202 80 1744 660 430 1476 1556 392 321 570 920 270 63050•2-235 3315 1825 1400 780 533 449 733 202 92 1308 685 355 1615 1700 317 246 542 1140 300 86050•2-280 3315 1825 1400 780 533 449 733 202 92 1308 685 355 1615 1700 317 246 592 1140 300 86050•2-300 3315 1825 1542 780 533 449 733 202 92 1450 685 355 1615 1700 317 246 592 1140 300 860

SCN 6200

SCN6201-1

SCN6201

Notes





a

y

Ø

A

l m

t

X

p

q

r

B n o

Exhaust

ed

fg

C

w

h i

Lifting points

Lifting points

cb

u

s

TN 1037-3

Gas-Over-Oil Actuatorcoupling dimensions


28

Ød4

h2

W

45°

D10

Drive sleeve

FLOW LINE

Top view of the scotch yoke mechanism(actuator shown in closed position)

N. Threaded holes

N.8

ho

les

flang

eN

.4 h

ole

s fla

nge

H m

ax

Ød2 +0.10

Ød3 ±0.2

Ød1 max

Øh1

+0.

50

P.C.D., number and size according to ISO 5211 (but the holes are on centerlineinstead of stradole the centerline)K +0.40

Ød5 +0.4+0.1

Actuator Ød1 Ød2 Ød3 Ød4 N h1 h2 H max Ød5 W Kmodel0.3 240 93 165 M20 4 5 17 127 70 12 75.60.9 310 112 254 M16 8 5 19 150 86 14 93.61.5 360 144 298 M20 8 6 19 190 112 18 1193 430 195 356 M30 8 9 23 200 157 25 167.86 520 250 406 M36 8 14 29 260 200 28 212.8

Dimensions in mmNote

P.C.D., number and size accordingto ISO 5211 (but the holes are oncenterline instead of straddle thecenterline)

SCN 6200

29



Ød4

h2

W D10

Drive sleeve

FLOW LINE


N. Threaded holes

N.1

2 ho

les

flang

eN

.16

hole

s fla

nge

H m

ax

Ød2 +0.10

Ød3 ±0.2

Ød1 max K

+0.

40

Actuator Ød1 Ød2 Ød3 Ød4 N h1 h2 H max Ød5 W Kmodel14 580 250 483 M36 12 10 29 340 175 45 195.818 680 290 603 M36 16 12 32 350 200 45 220.832 780 290 603 M36 16 12 32 400 220 50 242.8

Dimensions in mm Note

P.C.D., number and size accordingto ISO 5211

Ød5 +0.2+0.1

SCN 6201

h1 +

0.5 0



30


Drive sleeve

FLOW LINE

Flange sizing according to ISO

Actuator Ød1 Ød2 Ød3 Ød4 N h1 h2 H max Ød5 W Kmodel50 800 315 698 M36 24 10 32 430 240 56 264.860 840 315 698 M36 24 10 32 430 240 56 264.8

Dimensions in mmNotes

- Insert bush supplied by BIFFI withunmachined bore.Blind insert on request.For maximum stem acceptance seedwg. TN1005.

- Fixing bolts and nuts supplied by BIFFIonly on request.

- Different values of insert protrusion Kon request

N. Threaded holes

SCN 6201-1H

max

h1 +

0.5 0

Ød2 +0.10

Ød3 ±0.2

Ød1 max

Ød4

h2

W D10

Ød5 +0.2+0.1

K +

0.4

0

31



h2

Drive sleeve

Snap ring

Housing

Insert bush (1)

FLOW LINE

N.8

ho

les

flang

eN

.4 h

ole

s fla

nge

H

K (3

)

Ø I

Ø E

Ød3 ±0.2

Ød1 max

Actuator Ød1 Ød2 Ød3 Ød4 N h1 h2 H max Ød5 W Kmodel0.3 240 93 165 M20 4 5 17 23 70 20 1060.9 310 112 254 M16 8 5 19 41 86 20 1301.5 360 144 298 M20 8 6 19 53 112 22 1573 430 195 356 M30 8 9 23 73 157 32 1626 520 250 406 M36 8 14 29 109 200 35 214

Dimensions in mmNotes

- Insert bush supplied by BIFFI withunmachined bore.Blind insert on request.For maximum stem acceptance seedwg. TN1005.

- Fixing bolts and nuts supplied by BIFFIonly on request.

- Different values of insert protrusion Kon request

h1 +

0.5 0

Ø 2 +0.10

Ød4(2)Adaptor flange

N. Threaded holes

SCN 6202



32

Dimensions in mm

Notes

* S max: maximum external diameter in case of rounded edge.

* *Without adaptator flange- Key according to UNI6604 or

DIN6885 sh.1 or BS4235 part 1. or ISO773, or equivalent.

- The listed max acceptance valuesare applicable for stems with keywayparallel or perpendicular to the flowline and for square stems withdiagonal in parallel to the flow line

Actuator Max Max stem Max stem Square stem Max stemmodel operating diameter diameter with protrusion **

torque (Nm) with square key rectangular(key dimension) key (•)

W S*

0.3 2500 52 (14) 55 46 64 1200.9 7000 66 (16) 70 55 77 1401.5 12000 85 (18) 90 73 103 1803 25000 120 (32) 130 104 147 1906 50000 150 (36) 170 133 188 250

W

S max

TN 1005 - Stem acceptance for insert bush

Coupling bolts tightening torqueThread size Recommended tightening torque (Nm)

M8 20M10 40M12 70M14 110M16 160M20 320M22 420M24 550M27 800M30 1100M33 1400M36 1700

33

Gas-Over-Oil Actuatorenquiry and ordering data


Your enquiries for gas-hydraulic actuators can be efficiently processed when you supply the informationrequested on this page.Please use this page as guidance when sending yourenquiries; if you need assistance just directly contactour offices.

Applicable documents

Valve data

Actuator data

Customer requisition n° ...............................................................................................

Data sheet ...................................................................................................................

Specification ................................................................................................................

Manufacturer ........................................Model ..................Type .........................Size: ..................... � mm � inchesClass ............................ � Ansi/ � ApiDiff. pressure: from .............. to ............

� bar � psiService .............................................................................................................................................................................

Torque required to operate the valve(safety factor) � Nm � Lbs-inAt 0° (Close Valve) to open:

................... at min. diff. press. (90°)

................... at max. diff. press. (90°)At 90° (Open Valve) to close:

................... at min. diff. press. (90°)

................... at max. diff. press. (90°)Running: ............. Angular position: .....°

� To Open ...............................� To Close ...............................

Coupling dimensionsCustomer’s drawing N°..........................

Stem� Biffi Standard � According to

Customer’s DRWdiameter/square side ......................mmheight .............................................mmkey dimension ............... x ..............mmFlange Biffi standard � According to customer’s DRWG �Operating time (sec.): .............................Opening: from ................. to .................Closing: from ................. to .................Installationpipe axis: � vertical � horizontalvalve stem: � vertical � horizontalcylinder axis: � parallel � perpendicular

to the pipe axis

Gas supplyPressure: from .............. to ....................

� bar � psiTemperature ......................... � °C � °FFrom: � Main line � Separate LineComposition: ........................................

Connections: q.ty ..................................size ..................................

Environment conditions ........................Temperature ......................... � °C � °FRequired painting cycle ........................

Notes ...............................................................................................................................................................................................................................................................................................................................................................................

Remote electric controlSolenoid valve to Open �Solenoid valve to Close �Coils supply voltage ..........................

� DC � AC ............ HzLocal control � Emergency operation control ................. Set value ............................................... Other control .......................................................................................................Electric limit switchesOpen: q.ty .............................................Closed: q.ty ...........................................Intermediate: q.ty ..................................

� SPDT

Supply voltage .......................................� DC � AC ............ Hz� DPDT

Load: Inductive ........................ AmpsResistive ........................ Amps� Sealed SPDT

� SPDT: sealed under inert gasType/Manufacturer ................................ Electric position transmitter� from 0 to ...................................Ohm� from 1 to .........................................V� from 4 to 20 mA� Special ..............................................Local position indicator

� Standard � Special

Electric components protection� Weatherproof IP ................................� Explosionproof ..................................Standard ...............................................Cables entries N° ............... size ...........Gas storage tankN° of operations .................................... Code .....................................................Starting pressure .............. � bar � psiSafety valve � Code ..............................Other accessories ..............................................................................................................................................................................................................................................................................................

Control system

notes ...............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

notes ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................



34

Explosion-proof certificate for “Solenoid valves”according to ATEX directive 94/9/EC

35





36

Explosion-proof certificate for “Limit switches” enclosureaccording to ATEX directive 94/9/EC

37



Biffi Italia S.r.L. - Località Caselle S. Pietro - 29017 Fiorenzuola d’Arda (PC) - ITALYTel. (0523) 944411 - Fax (0523) 941885 / 943923 / 944500

e_mail: [email protected]

A.C

avaz

zuti/

Gra

fiche

Mal

vezz

i/3.0

00/0

4.01

Gpo

Documents

notethe operating diagram

hard chrome plated

atex directive 94 9 ec

compliance certificate issued

low friction coefficient

electric fail safe

local controlpress lever

torque limiting device