BIFFI Gas-over-Oil actuators, series GPO Pentair reserves the right to change the contents without notice BIFRM-0023-EN-1306 www.pentair.com/valves Features • Canted scotch yoke mechanism transforms movement of the hydraulic cylinder into a 90° rotation • Remote operation/network solutions (Modbus or other protocols) • Solar panel option for power supply of solenoid valves and electronic line break control • Housing in fabricated carbon steel, for maximum strength • Actuator flange can be machined to customer specifications • Gas-over-oil tanks according ASME VIII Div. 1, PED 97/23 EC. Other on request • Totally enclosed, weatherproof housing • Special coatings available for offshore or corrosive environments Technical data Torque : up to 400.000 Nm Supply pressure : 105 barg max. Temperature : -30 to +100°C Approvals Actuators are built according the following 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 The GPO calculations are approved by Lloyd Register (Machinery General Design Appraisal) according to S.I, N° 825, pipeline Safety Regulation. All GPO actuators are individually tested and EN 10204.3.1B certified. Materials Body : Carbon steel Cylinders : ENP/polished Piston rods : Hard chrome plated/ polished Guide bars : Hard chrome plated/ polished Bushing : Bronze or sintered, with PTFE Reliable gas-over-oil actuator for extreme applications in both on- and offshore markets
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BIFFI
Gas-over-Oil actuators, series GPO
Pentair reserves the right to change the contents without notice BIFRM-0023-EN-1306www.pentair.com/valves
Features• Canted scotch yoke mechanism
transforms movement of the hydraulic cylinder into a 90° rotation
• Remote operation/network solutions (Modbus or other protocols)
• Solar panel option for power supply of solenoid valves and electronic line break control
• Housing in fabricated carbon steel, for maximum strength
• Actuator flange can be machined to customer specifications
• Gas-over-oil tanks according ASME VIII Div. 1, PED 97/23 EC. Other on request
• Totally enclosed, weatherproof housing• Special coatings available for offshore or
corrosive environments
Technical dataTorque : up to 400.000 NmSupply pressure : 105 barg max.Temperature : -30 to +100°C
ApprovalsActuators are built according the following European directives:• Machinery Directive 8973/23 EC, 93/368• Low Voltage Directive EC/392, 91/368 EC• Electro-magnetic compatibility Directive
The GPO calculations are approved by Lloyd Register (Machinery General Design Appraisal) according to S.I, N° 825, pipeline Safety Regulation. All GPO actuators are individually tested and EN 10204.3.1B certified.
Reliable gas-over-oil actuator for extreme applications in both on- and offshore markets
2,5
1,5
1,0
2,0
2,5
1,5
1,0
2,0
0 9045
c
d
e
a
b
Gas-over-Oil actuators, series GPO
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1. General information on the scotch-yoke mechanism
Biffi gas-over-oil actuators, ‘GPO’ series for normal temperature (-30° to +80°C) or for low temperature (-60° to +80°C), are normally manufactured with a canted scotch-yoke mechanism. The torque curve developed by this type of actuator is most suitable to operate quarter-turn valves, particularly ball valves.
Figure 1 shows the diagrams, as a function of the angular position, of the typical required torque of a ball valve both in opening and in closing, and the output torque of a canted scotch-yoke mechanism.Figure 1 also shows the comparison between the output torque curves of a canted and a symmetric scotch-yoke mechanisms, and of a ‘constant torque’ actuator (i.e. Rack & Pinion type).These graphs demonstrate that, since the arm length and the cylinder diameter are the same, canted scotch-yoke actuators have the most suitable mechanism, both for technical and economical reasons, to operate quarter-turn valves.Biffi can anyway provide symmetric scotch-yoke actuators for special applications as low pressure ball valves or plug valves.- Special modules for remote communication via bus (Modbus or other protocols) are available.- Special power supply of solenoid valves and electronic line break control with solar panel is also
available.
Figure 1
Closed
Torq
ue
Angular position Open
Notes
a) valve opening torqueb) valve closing torquec) actual actuator output torque
(canted design)d) actual actuator output torque
(symmetric design)e) output torque of a constant torque actuator
Quality AssuranceBiffi has designed and implemented a Quality Assurance System in accordance with European standard EN-29001 (ISO 9001).Biffi Italia is certified for the Environmental Management System in accordance with ISO – EN 14001.Biffi Italia is also assessed by Achilles/First Point Organization.The Quality Assurance System is the instrument for monitoring the production process and the quality of the relevant services.Biffi Quality System ensures the following advantages: it is a guarantee for Biffi, as the various tests, which are carried out, highlight all possible critical points inside the organization, and thus make it possible to take the necessary corrective actions and to optimize the available resources. It is a guarantee for the customer as the control of every phase of the production cycle, from the quotation to the invoice, is performed within a controlled and documented system.
Gas-over-Oil actuators, series GPO
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2. GPO actuator assembly
Figure 2
Gas-over-oil tanks
Control group
Housing withscotch-yoke mechanism
Junction box
Flow control valves
Hydraulic cylinder
Mechanical stopper
Mechanical stopper
Hydraulic manual override
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4. Scotch-yoke mechanism
The scotch-yoke mechanism shown in figure 4 transforms the linear movement of the hydraulic cylinder into a 90° rotation.The housing (1) in fabricated carbon steel provides for the coupling of the actuator to the valve flange and the support of the hydraulic cylinder; it encloses the scotch-yoke mechanism and together with the cover provides the mechanical protection.For the coupling to the valve, the housing is provided with a flange with threaded holes and dimensions according to the Biffi standard tables SCN 6200 and SCN 6201 (see figure 33 & 34). If required, Biffi can supply an adaptor flange machined according to the valve coupling dimensions provided by the customer.The yoke (2) during its rotation is contained by bronze bushings (3): one is assembled in the flange of the housing, the other in the cover (4).The yoke has a bore with keyways to couple the valve stem, the dimensions of which are according to Biffi standard tables. On request Biffi can supply an insert bush with machined or unmachined bore according to the dimensions of the valve stem.The yoke receives the thrust of the cylinder from the block pin (5) by means of the bronze sliding blocks (6) which move inside the slots of the yoke arms.
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1
Figure 4Canted scotch-yoke mechanism
1. in open position2. in intermediate position
3. in closed position
2
3
5. Cylinder
The cylinders of gas-over-oil actuators are engineered and manufactured to be used in hydraulic service. Special care is taken to provide a smooth internal surface of the cylinder tube (10) by honing it.The piston rod (11) slides inside the bore of the head flange guided by the bushing (12). This guide bushing has surface contact with the piston rod in bronze charged with PTFE and guarantees a very low friction coefficient.The piston (13) slides inside the cylinder tube and is guided by a PTFE ring (14) which guarantees a high efficiency.The piston and piston rod seals are made by PTFE rings precharged by an o-ring made of the most suitable compound for the severest working conditions.
The block pin is mounted in the guide block (7) where the threaded end of the cylinder piston rod is screwed.The guide block slides along the guide bar (8) by means of the bushing (9) made of sintered bronze charged with PTFE.The bushing guarantees a very low friction coefficient.The guide bar withstands the transversal forces originated by the angle between the surface of the slots and the perpendicular to the piston rod axis.In this way the piston rod is not loaded with transversal forces, thus not wearing its guide bushing and its ring seals which are assembled in the head flange of the hydraulic cylinder.The bronze material used in the sliding parts guarantees a high efficiency of the mechanism.The angular stroke of the yoke is adjustable between 82° and 98° by means of the mechanical stops screwed into the end flange of the hydraulic cylinder (closed valve) and into the left side of the housing (open valve).In case of an actuator with two cylinders, both mechanical stops are screwed into the end flanges of the cylinders.
6. Gas-over-oil tanks
The gas-over-oil tanks are used to separate the feeding gas from the hydraulic cylinder.A dipstick screwed into the upper nozzle of the tank is used to check the oil level. In the bottom part of the tank is the hydraulic filter. The tanks are normally engineered, manufactured and tested according to ASME VIII-DIV. 1. The tanks can also be supplied in accordance with PED European Directive 97/23 EC, or other codes on request.
Figure 5a - Piston seals
Figure 5b - Piston rod seals
Figure 6
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7. Working principle
The gas-over-oil actuator is fed by pressurized gas which, after being filtered, flows through the control valves into the tank relevant to the operation (opening or closing) to be performed. The hydraulic oil contained in the tank is pressurized by the gas and flows into the relevant cylinder chamber, while the oil contained in the other chamber flows into the second tank. The cylinder piston stroke causes the actuator operation.The oil flow from the cylinder into the tanks is adjusted by means of two flow control valves. In this way it is possible to adjust the stroking time of the actuator.Emergency manual override can be performed by selecting the opening and closing operation by means of the hand actuated directional control valve and then actuating the hand pump.
Figure 7 - Latvian Gaze, 28” ball valve with GPO Figure 8 - Samsun Station Turkey 16” ball valves with GPO
8. Valve position indication
If required, the actuator can be supplied with electric limit switches which can be adjusted along the complete angular stroke of the valve. The limit switches can be provided in different types according to customer requirements: sealed, with contacts in inert gas atmosphere, with gold contacts, magnetic, proximity type etc. When possible, because of dimensions, quantity and characteristics, the limit switches are enclosed in a weather-proof IP 68 according to IEC 529 and EN 60529 and explosion-proof enclosure, which meets the ATEX European standard with a compliance certificate issued by an approved laboratory.In the upper part of the standard Biffi limit switches enclosure there is a local position indicator, which shows the position of the valve along the angular stroke.When a remote continuous signaling of the position of the valve is required, the actuator is supplied with a position transmitter in accordance with customer requirements.If limit switches are not required, a local mechanical position indicator is provided in the upper part of the yoke, for the continual indication of the position of the valve.
Figure 10 - Local mechanical position indicator
Figure 9 - Internal view of the electric limit switches enclosure
Figure 12 - Control system complete with solenoid valves and ‘line break’ device
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9. Actuator control system
Biffi has produced a wide range of pneumatic and hydraulic components specifically engineered to suit the most varying needs of the customer (i.e. control mode, emergency operation, working temperature range, pressure range of the gas supply etc.). These components guarantee a high reliability and compact design.Every pneumatic valve is engineered to work with high pressure gas. Therefore the control group does not need to be fed by means of a pressure reducer. In this way the reliability of the system is increased.The pneumatic valves in aluminium alloy are poppet-type in order to provide bubble tightness. The sealing seats are made of PTFE, thus granting chemical resistance, lack of sticking and aging effects and the highest compatibility with every environment condition. The basic control system of the Biffi gas-over-oil actuator mainly consists of a double 3-way 2-position control valve, which is normally piloted by 2 solenoid valves for remote control, one for closing and one for opening. It is also possible to locally operate this valve by means of 2 levers, one for closing and one for opening.The junction box, where all the wiring coming from the actuator electric components and from the remote control panel are connected, can be supplied complete with a local / remote selector.
The solenoids enclosures and the junction box are weather- and explosion-proof in accordance with ATEX standard (compliance certificate issued by approved laboratory). The Biffi control system is also certified by FM (U.S.A.), A.S. (Australia) and Gosgortechnadzor-EX-D (Russia).The pneumatic control valves are enclosed in a weather-proof padlockable enclosure.
Biffi can supply different types of control systems following customer requirements.Figure 11 - Control system complete with solenoid valves
Gas-over-Oil actuators, series GPO
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The actuator control can be made with one or more electric signals or by means of low/high pressure pneumatic signals.Automatic control groups for the actuator operation (in opening or in closing) are also available. The ‘ESD’ and the ‘line break’ devices are typical examples.The standard line break control is completely autonomous, not depending on other power/control sources.The ‘line break’ device automatically closes the actuator when the pressure drop rate exceeds a preset value.Special versions of line break control for sour gas, liquid fluids, dirty and very humid natural gas are also available.The ‘ESD’ device automatically opens or closes the actuator when the pressure or the pressure value is outside the normal range of values.The pressure switch can either be pneumatic or electric. A typical example of ‘ESD’ device is shown in schematic drawing figure 26.
A typical example of ‘line break’ device is shown in schematic drawing figure 28.In case the control signal is also present at the end of the manoeuvre like for the ‘electric fail safe’ system (see enclosed figure 27) and for the ‘ESD’ device, the actuator can be provided with pneumatic limit switches which cause the exhaust of the gas used for the operation at the end of the actuator manoeuvre. In this way the gas-over-oil tanks and all the hydraulic components are only pressurized during the actuator operation.
Pneumatic line break system
Electric signals
16 16
8
19
3 11G
C
K
H L
D
BFEA
2
13
20
Figure 13 - Control system complete with solenoid valves and ‘line break’ device
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An electronic version of the line break control is also available.
A pressure reducer or a ‘torque limiting device’ (Biffi patent) can be supplied, when the gas supply pressure varies in a wide range and when the actuator output torque must not exceed a fixed value in order not to damage the valve.The pressure reducer limits the output torque of the actuator by reducing the gas supply pressure at a preset value. The ‘torque limiting device’ consists of 2 pressure piloted valves, one for each gas-over-oil tank, which stop the gas flow coming from the pneumatic control valves of the actuator and exhaust the gas enclosed in the gas-over-oil tanks when the output torque exceeds the preset value.When the gas supply to the actuator is not always available, a storage tank engineered and manufactured according to the applicable code and working conditions is provided. The tank is equipped with the required accessories: safety relief valve, pressure gauge, stop valve, drain valve, etc.For heavy duty service or when required by the customer, the control valves can be supplied in a special execution (materials or design not standard), for instance pneumatic valves according to NACE standard for sour gas service.For any particular requirements it is advisable to contact Biffi sales offices, which will provide the most suitable and convenient solutions to the various needs.
Figure 14 - Torque limiting device
Figure 15 - GPO actuator with electronic line break control
Figure 16 - Hand pump with directional control valve and flow control valve
10. Speed control
The speed of actuator operation is adjusted by controlling the oil flow from the cylinder to the gas-over-oil tanks by means of 2 flow control valves. These valves are mounted on the pump-distributor group. They are unidirectional and allow independent adjustment of the stroking time both in closing and opening. By acting on the oil flow and not on the gas, it is possible to be more accurate in the speed adjustment, thus granting a smoother stroke of the actuator.
11. Emergency hydraulic manual operation
The Biffi gas-over-oil actuator is supplied with hand pump and a 4-position directional control valve to operate the valve in emergency conditions in case of gas supply failure.The directional control valve has 4 positions: automatic, close, open and by-pass. In ‘automatic’ position the hand pump is overridden, since in this case the actuator works by means of the gas supply. The ‘close’ and ‘open’ positions allow operating the actuator by actuating the hand pump.The ‘by-pass’ position allows for balancing the level of the oil contained in the 2 gas-over-oil tanks.A special execution assuring the priority of the remote operation is also available.
Gas-over-Oil actuators, series GPO
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12. Assembly of actuator onto the valve
For coupling to the valve, the housing is provided with a flange with threaded holes according to Biffi standard tables SCN 6200 and SCN 6201 enclosed (see figure 33 and figure 34).
The number, dimensions and diameter of the holes are made in accordance with ISO 5211, but for actuator models 0.3 to 6 the holes are drilled on the centerline in order to allow an easier assembly of an intermediate flange, when required. This intermediate flange can be supplied when the valve flange cannot directly match the actuator flange in its ‘standard’ configuration. For the biggest actuator models, the actuator flange can be machined in accordance with the valve flange dimensions.The yoke has a bore with keyways for coupling to the valve stem, the dimensions of which are according to Biffi standard tables SCN 6200 and SCN 6201.
If required, for the standard models size 0.3 to 6, Biffi can supply an insert bush with unmachined bore in accordance with Biffi standard table SCN 6202 enclosed (see figure 36). On request the insert bush bore can be machined by Biffi to couple the valve stem, provided its dimensions match the maximum stem acceptance of the bush according to Biffi table TN 1005, enclosed (page 28).The particular execution of the flange and bushing allow the actuator to be rotated by 90° in 4 different positions according to the following figure.
The Biffi insert bush with 2 external keys at 45° allows positioning the keyway for the valve every 90°. Consequently actuator can be mounted in 4 positions at 90° on top of the valve.For the biggest actuator models, the bore of the yoke can be machined according to the dimensions of the valve stem.
Figure 17 - Housing with scotch-yoke mechanism. Insert bush arrangement in 4 positions at 90°
Insert bush turned upside down
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
hol
es fl
ange
N.8
hol
es fl
ange
A
A
A
A
A A
AA
Pos.(1)
Pos.(2) Pos.(3) Pos.(4)
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13. Actuator power supply
The Biffi gas-over-oil actuator is engineered and manufactured to work with a pressure supply varying from 7 bar to 105 bar (from 100 psi to 1500 psi). Biffi can also provide actuators working at pressure supply values outside the above range.
The advantage of the Biffi gas-over-oil actuator is that it functions with the gas flowing in the pipeline without requiring another power source supply.Each actuator is also provided with a connection port to be fed by a separate supply line from a gas storage unit or by bottled gas.The Biffi gas-over-oil actuator is supplied with a filter to avoid the entrance of particles which might prevent the proper working of the pneumatic components. In case of wet gas, Biffi can supply a filter-condensate separator-dehydrator unit.
14. Final testing
It is very important to point out that Biffi tests 100% of the actuators. In order to do so, Biffi testing department is equipped with sophisticated test rigs which allow to check the correct working of the actuator with all the foreseen control modes.The testing department is also equipped with electronic devices which allow to measure various actuators parameters like the output torques, the values of which are written on the test certificate attached to each actuator. The tests are carried out in accordance with Biffi internal specifications and they can be integrated with additional tests in accordance with customer requirements.These tests can be witnessed by third party authorities or by the customer, in accordance with contractual terms.
Electric remote controlEnergize solenoid valve 10-PC to close or 10-PO to open the actuator, during the entire valve stroke.Solenoid valves must be de-energized at the end of the actuator operation.
Local controlPress lever of valves 10-PO to open and 10-PC to close with power supply
Manual operationSelect by the valve 2C the opening or closing operation and actuate the hand pump 2A
10
9 4-C 4-O
5 5
3-C3-O
2
Gas exhaust
6
7 8
12
Open
Close
Electric connection to solenoid valves and microswitches
DC DO
POPC
1
11
E.M.Auxiliary gas supply connection
Gas supply connection
C
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Electric remote controlEnergize solenoid valve 10-PC to close or 10-PO to open the actuator, during the entire valve strokeSolenoid valves must be de-energized at the end of the actuator operation
Local controlPress lever on valves 10-PO to open or 10-PC to close with power supply
Manual operationSelect by the valve 2C the opening or closing operation and actuate the hand pump 2A
Torque limiting deviceWhen the actuator output torque exceeds the set value, the torque limiting switch 13 stops the gas flow to the relevant gas-hydraulic tank 4, and the enclosed gas is exhausted
Local and remote control, torque limiting device
Item Name
1 Double-acting gas-over-oil actuator 2 Hydraulic manual override A – Hand pump B – Adjustable relief valve C – Hand-operated directional control valve 3 Unidirectional flow regulator (adjustable setting) 4 Gas-hydraulic tank 5 Hydraulic filter 6 Stop valve 7 Gas filter/Condensate separator 8 Dust excluder with check valve 9 Control valves enclosure with vent valve 10 Double 3/2 n.c. solenoid valve with manual override PC – 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 microswitches 12 Terminals enclosure 13 Torque limit switch Note
The operating diagram is drawn with control valves not actuated
Figure 25 - Local and remote control, torque limiting device
Gas supply connection
Electric connection to solenoid valves and microswitches
Gas exhaust
Auxiliary gas supply connection
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
15*
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Local and remote control, emergency low pressure shut down
Item Name
1 Double-acting gas-over-oil actuator 2 Hydraulic manual override A – Hand pump B – Adjustable relief valve C – Hand-operated directional control valve 3 Unidirectional flow regulator (adjustable setting) 4 Gas-hydraulic tank 5 Hydraulic filter 6 Stop valve 7 Gas filter/Condensate separator 8 Dust excluder with check valve 9 Control valves enclosure with vent valve 10 Double 3/2 n.c. solenoid valve with manual override PC – 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 microswitches 12 Terminals enclosure 13 Mechanical filter 14 Check valve 15 Gas storage tank 16 Needle valve 17 Pressure gauge 18 Relief valve 19 Manual drain valve 20 N.o. pneumatic pressure switch (adjustable setting) 21 3/2 n.o. cam-actuated/spring-return valve 22 3/2 n.o. pneumatic pilot/hand-return valve 23 Higher pressure shuttle valve
Electric remote controlEnergize solenoid 10-PC to close or 10-PO to open the actuator during the entire valve stroke. Solenoid valves must be de-energized at the end of the actuator operation.
Local operationPress lever of valves 10-PO to open or 10-PC to close with power supply
Manual operationSelect by the valve 2C the opening or closing operation and actuate the hand pump 2A
Emergency shutdown operationThe pressure to be controlled is connected to the pressure switch (20) pilot.When the pressure decreases below the set point of the pressure switch (20), a pressure signal pilots the valve (22) to inhibit opening operation and power valve (10-PO) causes the actuator closing.The pilot pressure must be re-established and the opening operation inhibition valve must be manually reset before the actuator can be reopened
Note
The operating diagram is drawn for solenoid valves coils not energized, low pressure in the ESD device pilot line, and no pressure in the gas supply line and into the storage tank
OpenClose9
4-C 4-O
2
5A
B
5
3-O 3-C
1
11
8
Figure 26 - Local and remote control, emergency low pressure shut down
C
E.M.
T.E.12
7
Gas exhaust
Auxiliary gas supply connection Electric connection to
solenoid valves and microswitches
Esd device pilot connection
* = Optional
6B
21
22
20
10
23PO
DCDO
PC
18*
19*
17*
16*14*
13* 6AGas supply connection Pneumatic connection
Hydraulic connectionElectric connection
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Electric remote controlEnergize solenoid 21 to open, de-energize to close the actuator: in case of electric supply failure the actuator moves automatically in closingAt the end of actuator strokes the valves 24 are actuated and cause the exhaust of the gas utilized for the operation
Local controlMove the valve 20 to ‘local operation’Press lever on valves 10-PO to open or 10-PC to close with power supply
Manual operationMove the valve 20 to ‘local operation’Select by the valve 2C the opening or closing operation and actuate the hand pump 2A
24-C
DC DO
Figure 27 - 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*
E.M.
16B
17B
Gas exhaust Electric connection to solenoid valve and microswitches
Auxiliary gas supply connection
Gas supply connection6
7
POPC4-O4-C
C
Close
Open
Local and remote control, electric fail safe
Item Name
1 Double-acting gas-over-oil actuator 2 Hydraulic manual override A – Hand pump B – Adjustable relief valve C – Hand-operated directional control valve 3 Unidirectional flow regulator (adjustable setting) 4 Gas-hydraulic tank 5 Hydraulic filter 6 Stop valve 7 Gas filter/Condensate separator 8 Dust excluder with check valve 9 Control valves enclosure with vent valve 10 Double 3/2 n.c. hand-operated/spring-return valve PC – 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 12 Terminals enclosure 13 Mechanical filter 14 Check valve 15 Gas storage tank 16 Needle valve 17 Pressure gauge 18 Relief valve 19 Manual drain valve 20 3/2 hand-operated valve 21 3/2 n.o. solenoid/spring-return pilot valve 22 3/2 n.o. pneumatic pilot/spring-return valve 23 Higher pressure shuttle valve 24 3/2 n.o. cam-actuated/spring-return valve
Note
The operating diagram is drawn for solenoid valve coil not energized, no pressure in the gas supply line and into the storage tank, valve in intermediate position
13*
Local and remote control, line break device
Item Name
1 Double-acting gas-over-oil actuator 2 Hydraulic manual override A – Hand pump B – Adjustable relief valve C – Hand-operated directional control valve 3 Unidirectional flow regulator (adjustable setting) 4 Gas-hydraulic tank 5 Hydraulic filter 6 Stop valve 7 Gas filter/Condensate separator 8 Dust excluder with check valve 9 Control valves enclosure with vent valve 10 Double 3/2 n.c. solenoid valve with manual override PC – 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 microswitches 12 Terminals enclosure 13 Mechanical filter
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A
16*
15*
19*
14*
C
B
L.B. Device test ports
L.B.23
DODC
EF
Figure 28 - Local and remote control, line break device
Electric remote controlEnergize solenoid valve 10-PC to close or 10-PO to open the actuator, during the entire valve strokeSolenoid valves must be de-energized at the end of the actuator operation
Local controlPress lever on valves 10-PO to open or 10-PC to close with power supply
2122
* = Optional
A
BC
108
9
7A T.E.
6C
B
5 5
2
1
3-O
4-C 4-O
7B
12
PC PO
Gas exhaust
17*
18*
13A* 6A*
13B* 6B*
24
Line break device
connection
Auxiliary gas supply connection
3-C
A
11E.M.
Gas supply connection (upstream the valve)
Gas supply connection (downstream the valve)
Electric connection to solenoid valves and microswitches
CloseOpen
Note
The operating diagram is drawn with control valves not actuated
Manual operationSelect by the valve 2C the opening or closing operation and actuate the hand pump 2A
Line break operationA rate of pressure drop in the pipeline causes a differential pressure across the diaphragm valve 22. When the differential pressure is higher than the preset value, the diaphragm valve 22 trips and pilots the valve 20 to inhibit open operation and the power valve 10C causes the actuator to close.
After the line break intervention, the inhibition valve (20) must be manually reset before the actuator can be reopened.The line break pilot has to be connected to the pipeline (downstream the valve) and the pressure intake has to be separate from the gas supply pressure intake
14 Higher pressure shuttle valve (double check valve) 15 Gas storage tank 16 Needle valve 17 Pressure gauge 18 Relief valve 19 Manual drain valve 20 3/2 n.o. pneumatic pilot/hand-return valve 21 Shuttle valve device A – Check valve B – Low pressure vent valve C – Stop valve for pressure gauge D – Pressure gauge E – 2/2 hand-operated valve F – 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 orifice B – Stop valve 24 Reference tank for line break device
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Pentair reserves the right to change the contents without notice page 20
15. Sizing of gas-over-oil actuators
Normally the power gas for GPO actuator feeding is taken directly from the gasline. This means that the pressure of the gasline is the same used by the actuator. Being the pipeline pressure normally not constant, a minimum and a maximum value of the pipeline pressure is defined by the technical specifications.With the minimum pressure the actuator must move the valve with the minimum ∆P. With the maximum pressure the actuator must move the valve with maximum ∆P.Usually the most critical situation for the actuator is the running torque of the valve when the minimum pipeline pressure is available.Only when the gas supply is taken from an independent source (separate pipeline, emergency tank, separate control system) the actuator with the minimum supply pressure must be able to move the valve with the maximum ∆P.
Particular attention must be paid to the opening of vent valves and by-pass valves, generally of small size. In this case the gas speed and the ∆P across the valve generate a significant dynamic torque to close the valve not only near to the closing position, but along the valve stroke. The valve makers must carefully evaluate this situation and provide the correct torque values for the real operating condition of the valve.The rule of thumb for this application is to consider the actuator supply at minimum pressure (i.e. 25 barg) to move the valve with the max ∆P (i.e. 100 barg).
16. Gas-over-oil actuators ‘HYGLA’ for Linear Valves
For the motorization of linear valves, as through-conduit gate valves frequently used in the gas pipelines, Biffi can also propose the proper gas-over-oil actuators of the ‘HYGLA’ series.
HYGLA actuators utilize the same high-pressure controls used for quarter-turn actuators GPO.Proper pedestals with flanges and adjustable stem joint to meet the valve top mounting design are normally supplied.
In order to keep the valve in position, the control systems usually include the hydraulic locking device with double piloted check valves with thermal relief function or mechanical lock piloted by the power gas.
Gas-over-Oil actuators, series GPOoverall dimensions
Pentair reserves the right to change the contents without notice page 21
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
a
y
A
l m
ut
X
p
qr
B
n
o
Exhaust
z z
ed
fg
C
w
h i
Lifting points
cb
Figure 30 - TN 1037-1
Dimensions in mmActuator A B C a b c d e f g h i l m n o p q r s t u Ø Coupling Weightmodel dwg (Kg)
Gas-over-Oil actuators, series GPOoverall dimensions
Pentair reserves the right to change the contents without notice page 22
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
Figure 31 - TN 1037-2
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
Dimensions in mmActuator A B C a b c d e f g h i l m n o p q r s t u Ø Coupling Weightmodel dwg (Kg)
Gas-over-Oil actuators, series GPOoverall dimensions
Pentair reserves the right to change the contents without notice page 23
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
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
Figure 32 - TN 1037-3
Dimensions in mmActuator A B C a b c d e f g h i l m n o p q r s t u Ø Coupling Weightmodel dwg (Kg)