Iom Gen Truseal 1

7/30/2019 Iom Gen Truseal 1

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GENERAL VALVE

Installation, Operation and Maintenance Manual GENERAL TRUSEAL / IOM-GEN-TRUSEAL

GENERALTRUSEAL

P R O C E S S V A L V E S

Installation, Operation and Maintenance Manual


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Camerons Valves & Measurement Group Revised 10/07 IOM-GEN-TRUSEAL

Installation, Operation and Maintenance Manual


TABLE OF CONTENTS

GENERAL TRUSEAL VALVESInstallation ..................................................................1Valve Operation ......................................................... 2Operating Instructions ............................................... 3Parts List ................................................................... 4Bleed Systems .......................................................... 6Repairs ...................................................................... 8Field Service Guide ................................................. 11Operator Inspection ................................................. 13

GENERAL TRUSEAL / IOM-GEN-TRUSEAL


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INSTALLATION

Installation, Operation and Maintenance Manual 1 GENERAL TRUSEAL / IOM-GEN-TRUSEAL

ORIENTATIONGENERAL TRUSEAL valves may beinstalled in any position.

FLOW DIRECTION

The GENERAL TRUSEAL valve design issymmetrical. Flow shut-off is achievedequally on both sides, independent of flowdirection.Note: Read the section on ThermalRelief Accessories, on pages 6-7, whichDO result in a preferred flow direction.

CLEARANCE FOR REPAIRFor easy repair, space should be allowedbelow the valve for removal of the lowerplate and withdrawal of the seating slips.See Table 1 for dimensions. Sufficient clearspace is required above the GENERALTRUSEAL valve, to allow free movement ofthe position indicator flag and for removal

of the operator mechanism.

TABLE 1CLEARANCE REQUIRED BELOW THEVALVE FOR SLIP REMOVAL

Note: Allowing more than the specifiedminimum amount of clearance will makeservicing easier.

Minimum Clearance

Valve ASME ASME ASMESize 150 300 600

2" 3" 3" 3"

3" 3" 3" 3"

4" 5" 5" 4"

6" 8" 9" 8"8" 10" 9" 7"

10" 12" 12" 11"

12" 15" 14" 14"

14" 16" 16" -

16" 18" 18" -

18" 18" 18" -

20" 22" 24" -

24" 26" - -

30" 30" - -

FLANGE FASTENERSCertain TRUSEAL flange holes are drilled and tapped, when there is nopossibility of fitting a hexagonal nut behind the flange. The quantity andsize of these tapped holes is shown on Table 2. Capscrews or stud boltsmay be used in these holes.

TABLE 2

FLANGE FASTENERS

Valve Size Number of Length Required

Tapped Holes Thread Capscrews or Stud Bolts

inch ASME Class Per Flange UNC inch inch

6 150 4 3/4"-10 2 3

8 150 4 3/4"-10 2 3

10 150 4 7/8"-9 2 1/4 3 1/2

12 150 4 7/8"-9 2 1/4 3 1/2

14 150 4 1"- 8 2 1/2 3 3/4

16 150 8 1"-8 2 1/2 3 3/4

18 150 8 1 1/8"-8 2 3/4 4

8 300 4 7/8"-9 2 3/4 4

10 300 4 1"-8 3 5

PRESSURE TESTGENERAL TRUSEAL valves can be hydrostatically pressure-tested afterinstallation, to full API 6D limits as defined below.

TABLE 3

PRESSURE TEST

Valve Figure No. 211 221 241 Comments

ASME Class 150 300 600

Shell Test Pressure (psig) 500 1200 2250 No leakage permitted(Valve Open) (kg/cm2) 35 85 158

Seat Test Pressure (psig) 300 800 1600 Test upstream and downstream(Valve Closed) (kg/cm2) 21 56 113 seats. No leakage permitted.

Supplemental (API 598) (psig) 80 80 80 Test upstream and downstreamAir Seat Test Pressure (psig) 6 6 6 seats. No leakage permitted.(Valve Closed)

GEAR-HEAD ORIENTATIONWhen GENERAL TRUSEAL gear operators are used, the orientation ofthe handwheel shaft can be changed to suit operational requirements.Follow these instructions to change gear-head orientation.(See page 4 for parts reference).

a. Remove all the gear housing bolts (part no. 42), but support theweight of the handwheel and shaft.

b. Turn the handwheel so that the gear housing rotates to the desiredposition.

c. Align the bolt holes and replace the gear housing bolts.

ICE WARNING: Water in the bottom of the GENERAL TRUSEALvalve must be drained before freezing conditions occur.Ice below the plug can exert enough force to destroy the operatormechanism. Drain any water from plugged holes in the lower plate.The valve must be in the closed position before removing plugs.


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Installation, Operation and Maintenance Manual 2


VALVE OPERATION


1.Valve fully closed,plug is down withthe resilient sealscompressedagainst the valvebody.

2.Plug raised withseals retractedfrom the bodycontact bydovetailconnection.

3.Plug turning toopen position.No seal to bodycontact.Line load carriedon plug trunnions.

4.Valve is fully openwith sealsprotected fromflow path.

5.Valve is fullyopen with sealsprotected fromflow path.

6.Plug turningtoward theclosed position.Resilient sealsheld away frombody by dovetailconnections.

7.Plug turned a full90, positioningthe seals overboth the upstreamand downstreamports.

8.Plug down,seals expandedoutward againstbody.Valve fully closed.

BODY BLEED

BODY BLEED

OPENING CLOSING


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OPERATION INSTRUCTIONS


LIFT AND TURNGENERAL TRUSEAL is a lift-and-turnplug valve. The valve operatormechanism converts the rotary actionof the handwheel into the thrust and

turn movement of the plug.

BEFORE USEBefore operational use, check that theisolation valve on the thermal relief orautomatic body bleed, if applicable, isfully open to allow the system tofunction. If the valve is equipped witha manual body bleed only, then openand close the manual bleed valve torelieve the internal body pressure,before attempting to open a closedGENERAL TRUSEAL.

OPERATIONClockwise turning of the handwheel

will close the valve.Counter-clockwise turning of thehandwheel will open the valve.

CLOSINGClose the GENERAL TRUSEAL valveuntil resistance is felt. The soft sealshave made contact with the body.Turn the handwheel further tocompress the soft seals until thereis a definite feel of "end of travel".Now the soft seals are fullycompressed, metal-against-metal,giving fire safe seating. Firm, positiveturning of the handwheel is sufficientto seal the valve. Verity tight sealing

by opening the manual body bleedvalve or by observing any other bleedsystem fitted. Pressure release isnormal. Constant dripping is normal.See page 11, if dripping continues.

OPENINGIf a manual bleed alone is fitted, openit and close it, to release any thermalpressure build up. Turn the GENERALTRUSEAL handwheel counter

clockwise until definite "end of travel"can be felt. Do not force or slam thehandwheel fully open. The end oftravel is pre-set to ensure portalignment. Do not "back-off" a partialturn from fully open.

INDICATOR FLAGThe indicator flag shows the positionof the plug port at all times. Positionedat right angles to the pipeline anddown, shows the GENERAL TRUSEALis closed. In-line with the pipeline andup, shows the GENERAL TRUSEALis open.

CAUTIONDo not throttle with a GENERALTRUSEAL valve. Even thoughGENERAL TRUSEAL valves cannotslam shut, they should only be openor closed. Never leave a GENERALTRUSEAL valve in a half-way position.The soft resilient seals can be erodedby high velocity flow that occurs if thevalve is used in the partially openposition.

ROUTINE ATTENTIONGENERAL TRUSEAL valves requireno routine maintenance for positivesealing performance. Occasional

injection of bearing grease,depending on the frequency ofoperations, will keep the turningaction smooth. A grease point islocated near the handwheel.

MANUAL BODY BLEED (MBV)

MANUAL BLEED WITH THERMAL RELIEF (MTR)

INDICATOR FLAG

DO NOT USE FORCE!

Nor extension poles on GENERALTRUSEAL valve handwheels.

ever use wheelkeys, cheaters,


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PARTS LIST

Valve Body Section

Gear System Operator


No. Description

45 Handwheel Bolt

50 Bearing Retainer O-Ring-Inner

51 Bearing Retainer O-Ring-Outer

56 Dust Cap O-Ring

74 Pinion Key

76 Handwheel Key

80 Gear Locknut

81 Pinion Locknut

86 Washer

92 Ball Bearing

93 Ball Bearing

No. Not Shown

36 Shim Set

71 Grease Fitting

79 Gear Key

No. Description

28 Dust Plug

29 Handwheel Spacer

31 Bearing Spool

32 Gear

33 Pinion Shaft

34 Gear Housing

35 Pinion

40 Bearing Retainer

41 Bearing Spool Bolt

42 Gear Housing Bolt

44 Bearing Retainer Bolt

No. Description

1 Body

2 Bonnet

3 Lower Plate

4 Plug

5 Slip

6 Packing Gland

7 Bushing

8* Gasket (flat or spiral wound)

No. Description

42 Packing Gland Bolt

43 Body Stud

44 Body Nut

52 Body O-Ring

53 Inner Gland O-Ring

54 Outer Gland O-Ring

61* V-Packing Set or Graphite Rings

75 Body Drain Pipe Plug

*when ordering parts.Specify valve serial number


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PARTS LIST


200 Series 400 Series Operator 200 Series Operator

No. Description

21 Operator Housing

22 Bearing Cap

23 Handwheel

24 Drive Nut

25 Stem

26 Coupling Cam

27 Cam Pins

28 Dust Cap

30 Shim Set

38 Indicator Flag

38a Indicator Flag Pin

41 Bearing Cap Bolt

45 Operator Housing Bolt

51 Bearing Cap O-Ring

56 Dust Cap O-Ring

78 Coupling Pins

79 Handwheel Key

91 Thrust Bearing Assembly

71 Grease Fitting (not shown)

No. Description

21 Operator Housing22 Bearing Cap

23 Handwheel

24 Drive Cam

25 Stem

26 Coupling Cam

27 Cam Pins

38 Indicator Flag

38a Indicator Flag Pin

39 Indicator Flag Rod

41 Bearing Cap Bolt

45 Operator Housing Bolt55 Stem Seal O-Ring

63 Bearing Cap O-Ring

77 Coupling Pins

79 Handwheel Key

80 Handwheel Retaining Nut

91 Thrust Bearing

30 Shim Set (not shown)

400 Series


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BLEED SYSTEMS


1MANUAL BLEED VALVE (MBV)The simplest bleed valve for hand operatedGENERAL TRUSEAL valves.When GENERAL TRUSEAL is closed, openbody bleed valve to check drop tight sealing.

Close MBV before opening the GENERALTRUSEAL. Bleed outlet should be properlypiped to suitable drainage sump.Note: the "goose neck" pipe to preventdrainage of the body liquid.

THERMAL RELIEF**TO BODY (TRB)With the GENERAL TRUSEAL closed theThermal Relief Valve releases any thermalexpansion of the body liquid, back safely andautomatically, to the line. Relief set at 25 psi.*

THERMAL RELIEF TOATMOSPHERE** (TRA), (See Page 10)

Similar to TRB except thermal relief valve isset at 50 psi above pipeline rated pressureand is vented to atmosphere.

1MANUAL BLEED VALVE WITHTHERMAL RELIEF** (MTR)The manual bleed proves drop tight sealing.The Thermal Relief Valve releases anythermal expansion of the body liquid, backsafely and automatically to the line.Relief set at 25 psi.*

1When a manual bleed or automatic bleed is

fitted, the vent pipe should always be abovethe highest point of the valve body cavity.This will prevent liquid in the body cavity

from dripping out. Leakage past either sealwould expel liquid from the already-full bodycavity.

*The relief valve is set to open at 25 psion all valves, regardless of their workingpressure. With the valve closed, the reliefvalve will open at 25 psi above upstreampressure. This system functions only whenthe GENERAL TRUSEAL valve is closedand the isolation valve is open.

CAUTIONA thermal relief system, piped back to the valve throat, converts theGENERAL TRUSEAL to a "DIRECTIONAL" valve. Thermal relief shouldalways be piped back to the upstream side. If it were piped to thedownstream, any leakage past the main seal on the "up" side would bepermitted to by-pass the "down" seal, by way of the directional check valve.


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BLEED SYSTEMS


TRUSEAL

Valve

CAUTIONIn normal service, the Manual Bleed is kept closed, unless to check forGENERAL TRUSEAL tightness or to vent thermal pressure rise. Withautomatic bleed or thermal relief back-to-line, the manual isolation valvethat is attached to the GENERAL TRUSEAL body must always be open,except for maintenance. If the isolation valve is closed, the relief systemcannot operate.

AUTOMATIC BODY BLEED1

VALVE (ABV)A plunger actuated check valve is openedby the coupling cam as the GENERALTRUSEAL is closed (either manually or bypower actuator). This system removes thehuman element from seal checking,making it completely automatic.The isolation valve may be padlocked"open" to ensure total double block andbleed integrity, avoiding any risk of humanerror in sealing verification.***

1MANUAL BLEED VALVEWITH GAUGE (MBG)The manual bleed valve is combined witha gauge when emission to atmosphere isundesirable. The closing action of aGENERAL TRUSEAL valve automaticallyreduces body cavity pressure due to the

expanding seating segments. The gaugealone will indicate tight seals. (After aperiod of time, body pressure may againincrease due to thermal expansion of fluidin the body cavity).

THERMAL RELIEF** VALVEWITH GAUGE (TRG)

A thermal relief valve, to relieve any bodypressure which may build up due tothermal change, is combined with a gaugeto indicate tight seals. No emissions toatmosphere.No sump system required.Relief set at 25 psi*.

**Thermal relief systems are designed torelieve excess pressure rise in the bodycavity of a closed valve due to ambienttemperature causing expansion of theliquid in the valve.

*** Some fluid is emitted at each actuation.A sump system is important as fluid willspurt out as the GENERAL TRUSEALapproaches the closed position and thecam opens the ABV. The spurting willcease as GENERAL TRUSEAL is fullyclosed for positive verification of doublesealing.

Note: All automated TRUSEAL valvesrequire some form of body pressurerelief. TRB/TRA/MTR/ABV/TRG


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REPAIRS


These instructions are written assuming the valve is installed in a horizontal line,with plug stem vertical, handwheel above the pipeline. Should there be anydifficulty interpreting these guidelines for other mounting positions, consult yournearest GENERAL TRUSEAL representative.

LOWER PLATE REMOVAL

SUPPORT ONE SLIP, REMOVE THE OTHER

SEATING SLIPS

LOWER PLATE GASKET

SEATING SEALINSPECTION OR CHANGESeating seals are bonded to metalsegments called "slips". Slips can befactory re-bonded, if the metal hasnot been damaged.

WARNING:NEVER ATTEMPT TO CHANGESLIPS WITH VALVE UNDERPRESSURE.

DAMAGE TO THE VALVE ANDINJURY TO PERSONNELCOULD RESULT.

Leave the GENERAL TRUSEALmounted in line, in the open positionand drain the line before proceeding.

Check by means of the body bleedand lower plate drain, that the pipe isempty. Close the GENERAL TRUSEAL,to wedge the slips against the valvebody. This will prevent the slips fromdropping out when the lower plate isremoved.

With support under the lower plate,remove the lower plate nuts(part no. 44) and the lower plate.

If necessary, use jack-bolts in thetapped holes provided for thispurpose.

With support under the slips, turnthe GENERAL TRUSEALhandwheel towards "open". Keephands and feet out from under theslips.

The slips (part no. 5) will slide offthe plug.

Be sure that the spaces left byremoval of the slips are clean.

Inspect the seals for evidence ofdamage. Substitute with new slipsif there is any cut or missingsection in the soft seal.Reassemble in reverse order.Be sure to use a new body O-ring(part no. 52) and a new gasket(part no. 8).

Do not force any part. Slips shouldfit freely on plug dovetails.Check for sediment or corrosion or

build-up of foreign deposits, ifcomponents do not fit easilytogether.

Alternatively, slip removal from thetop is possible, by removing thebonnet.

Consult your local Cameronrepresentative for detailedinstructions.

SLIPS FIT ON PLUG DOVETAILS


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REPAIRS


CHANGINGTHE STEM PACKING

WARNING:

NEVER ATTEMPT TO CHANGEPACKING WITH VALVE UNDERPRESSURE.

DAMAGE TO THE VALVE ANDINJURY TO PERSONNELCOULD RESULT.

If the packing is to be changed, thepipeline must be drained and checkedby venting the body bleed.Only proceed after you are certain thevalve and line do not contain pressure.Remove the operator as decribed inthe next column. ("Operator Change").

Remove the packing gland bolts(part no. 42, Page 4).

Remove the packing gland (part no. 6).

Remove the V-packing set (part no. 61).

Carefully install new V-packing, onering at a time, taking care that lips arenot damaged and that lips face intothe valve.

Install new gland O-rings (part no. 53 &54) and scraper ring, if originally fitted.

Install packing gland and retaining bolts.Torque the bolts until the gland is tight,metal/metal, against the bonnet surface.

Install operator with coupling pin andfixing bolts.

Use only GENERAL TRUSEALapproved parts, as dimensions arecritical to good operation.

CAM PIN CHANGE(See Page 12)Worn or damaged cam pins (part no. 27)can cause the GENERAL TRUSEAL tomalfunction, (i.e. stiff turning or failure toseal tight).

Remove one pin at a time, to inspectfor wear or damage. Replace that pinbefore removing another cam pin,to avoid realignment difficulty of pinsin their guide slots.

When installing cam pins, do not useexcessive torque. The cam pins onlyrequire a "snug" metal-to-metal fit.

A slightly polished wear-spot is normal.Severe "D" shape, flat spot, or bendingof the pin is not normal. Replace witha new cam pin if wear is evident andinvestigate the cause.

Use only genuine GENERAL TRUSEAL

parts. Dimensions and materialhardness are critical for good operation.

OPERATOR CHANGEOR REMOVAL1. Close the GENERAL TRUSEAL valve.

2. Remove the yoke housing bolts(part no. 45, Page 13).

3. Drive out the lower coupling pin(part no. 77 or 78).

4. Lift off the whole operator.

5. Install an operator in reverse order.

CAUTION:

If the operator has been removedfrom a GENERAL TRUSEAL valve,the lower plate MUST NOT BEREMOVED without first ensuringthat the plug is firmly held by itsupper stem. There is a couplinghole through the upper stem, towhich support may be attached.

OPERATOR REMOVAL

PACKING GLAND REMOVAL

V-PACKING REMOVAL

REPLACING GLAND O-RINGS


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REPAIRS


THERMAL RELIEFBLEED SYSTEM(TRA, TRB, TRG or MTR -See pages 6-7).

Malfunction of the thermal reliefsystem can be diagnosed if a manualbleed is also installed. If any drippingfrom the manual bleed is stopped byclosing the isolation valve in the throatof the GENERAL TRUSEAL, then theGENERAL TRUSEAL elastomer sealsare in good condition. The leak pathis through the thermal relief system.

THERMAL RELIEFSYSTEM REPAIR1. Close the GENERAL TRUSEAL

valve.

2. Open the manual bleed valve, (if

fitted), to verify that line pressureis not present in the vent system.If no manual bleed has been fitted,line pressure must be removedfrom the pipeline before the reliefcouplings are loosened.

3. Close the isolation valve in thethroat of the GENERAL TRUSEAL,(if fitted),

4. Only proceed further when liquidrun-off has stopped. The thermalrelief element is now isolated andcan be uncoupled from its pipework.

5. Clean out the relief valve or replaceit with a new part. Check for tight

sealing with an airline and soapbubble test before installation.

6. Reassemble the pipework, takingcare to install the relief valve withthe correct flow direction, FROMthe body TO the line (TRB, TRG orMTR Assembly). FROM the bodyTO atmosphere (TRA Assembly).

AUTOMATIC BLEED VALVE(ABV) - REPLACEMENTIf it is necessary to remove the ABV,first close the GENERAL TRUSEAL.Verify that the body pressure hasvented by observing discharge fromthe bleed drain pipe. Close theisolation valve on the body cavity andthen disconnect the bleed pipes fromthe ABV.

Loosen the locknut on the ABV andunscrew the ABV body from theoperator housing. Clean it or replaceit with a new ABV. To reinstall the ABV,screw the ABV into the operatorhousing until the plunger-end justtouches the cam. Blow through the

ABV ports and continue to turn theABV to find the point where the seatbegins to lift. Then rotate the ABV an

additional 1/2 turn clockwise andtighten the locknut.

Reconnect the bleed lines to the ABVand open the isolation valve on thebody cavity.

Cycle the GENERAL TRUSEAL openand closed to check for properoperation of the ABV. A spurt of liquidshould come from the ABV drain pipe

just before the GENERAL TRUSEALreaches "fully closed".

MANUAL BLEED WITH THERMAL RELIEF (MTR)

AUTOMATIC BLEED VALVE (ABV)

THERMAL RELIEF TO BODY (TRB)

THERMAL RELIEF TO ATMOSPHERE (TRA)

AUTOMATIC BLEED WITH SIGHT GLASS


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FIELD SERVICE GUIDE


OBSERVATION

LEAKAGEFROMBODY BLEED(GENERAL TRUSEAL valve inCLOSED position)

SUGGESTED PROCEDURE

1 Check for the possibility that theGENERAL TRUSEAL valve is notfully closed. Do not use excessiveforce to close, as this may causedamage to the GENERALTRUSEAL.

2 The dripping may be due tothermal expansion of the liquid ortrapped vapor in the valve body,caused by temperature rise.If this is the case, leakage willstop when temperature stabilizes.

3 If a thermal relief and manualbleed system is fitted, ventingback to the line, isolate the reliefvalve by closing the manualisolation valve in the GENERALTRUSEAL throat. If leakage fromthe manual bleed stops, refer toinstructions for the repair of athermal relief system on page 10.

4 Close the body bleed, then fullyopen and close the GENERALTRUSEAL two or three times to

flush out any dirt that may haveaccumulated in the valve.

5 If none of the above proceduresstop the leakage, remove theseating slips. (See instructionson page 8). Inspect foraccumulated dirt or ice, ordamage to the soft seals.Inspect the spaces left by theremoval of the slips to ensurethey are clean. If the seals arecut or damaged, replace withnew slips. Install the cleaned ornew slips and fit a new gasketand body O-ring before

replacing the lower plate.

OBSERVATION

LEAKAGE FROMAUTOMATIC BLEED

VALVE (ABV)(GENERAL TRUSEAL valve inOPEN position)

SUGGESTED PROCEDURE

1 Close the isolation valve on theGENERAL TRUSEAL body.

2 Check to see if the plunger ofthe ABV is free to move.

A screwdriver blade can beinserted through the cut-out holein some operators to depressthe ABV plunger. Otherwise,continue with steps 3-5 below.

3 Open the isolation valve on theGENERAL TRUSEAL body.

4 Stroke the GENERAL TRUSEALopen and closed two or threetimes to flush out any dirt thatmay have accumulated in the

ABV seal area.

5 If the ABV still does not operateproperly, remove the ABV andclean or replace it. Refer toinstructions on page 10.

OBSERVATION

GENERALTRUSEAL VALVEWILL NOT OPEN(DO NOT USEEXCESSIVE FORCE!)

SUGGESTED PROCEDURE

1 Check for a "pressure lock" conditionby venting the body cavity, relievingexcess pressure.

2 If a thermal relief is fitted, check thatthe isolation valve on the throat ofthe GENERAL TRUSEAL is open,allowing the thermal relief system tooperate.

3 Drive out the coupling pin (partno. 77 or 78). Try to actuate theoperator only. If the handwheel stilldoes not move, there is a problemwith the operator mechanism.Read the instructions on operatorinspection, page 13. If thehandwheel moves easily, thestiffness is in the valve body section.

4 Remove line pressure and vent theGENERAL TRUSEAL body cavitypressure. Refit the coupling pin.Remove the yoke housing bolts(part no. 45), the flag indicator(part no. 38) and the cam pins (partno. 27). Now turning the handwheel

will lift the operator housing upwards,exposing the packing gland. Lift thehousing enough to allow a wrenchto fit onto the packing gland bolts.Loosen the packing gland bolts oneturn. Reassemble the operator andturn the handwheel. If it now moveseasily, the stiffness could have beencaused by excessive swelling of thestem packing, resulting in the tightgripping of the plug stem.

Consult Cameron for advice onsuitable stem packing material, ifpacking swelling appears to be aproblem. Do not restore line

pressure to the valve until thepacking gland bolts are tightened.

5 If there is no release of stiffness,the valve must be isolated fromservice. Remove the lower plateand slips (refer to instructions onpage 8) to determine the cause ofthe stiffness inside the valve body.See "CAUTION", page 9.


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12Installation, Operation and Maintenance Manual


FIELD SERVICE GUIDE


OBSERVATION

GENERALTRUSEAL VALVEWILL NOT CLOSE(DO NOT USEEXCESSIVE FORCE!)

SUGGESTED PROCEDURE

1 Remove the operator yoke housingbolts (part no 45). If handwheelrotation now causes the housing tolift upwards easily, then the operatoris functioning correctly. If the operatorhandwheel does not rotate easily,then skip to procedure number 8.

2 Look for stiffness in the body section.Restore the bolts to the yoke housing,then follow the seal inspectioninstruction on page 8. Omit theinstruction to close the valve. Takespecial care to support the weight ofthe lower plate and slips, as lowerplate nuts are removed.

3 Look for dirt accumulated below theplug that could prevent downwardmovement.

4 Look for compacted sand andpipe-scale on the face of the seatingslips that could prevent the soft sealsfrom touching the body.

5 Look for accumulated sand or scale

or ice in the trunnion hole of thelower plate.

6 Look for corrosion or excessivedeposits of hard material in thedovetail region between slips andplug. Remove any deposits witha wire brush and investigate thecause of the deposit.

7 Look for blockage of the reliefholes in plug trunnion bushing(part no. 7, page 4).

8 If the removal of yoke housing bolts(in section 1 this page), did not freethe handwheel movement, do notremove the operator, or the plugmay drop while in the "Open"position. With the operator stillmounted on the valve, follow theinstructions for "Operator Inspection",page 13, to determine the cause ofstiffness.

CAUTION:

WHEN DISMANTLING ANYMECHANICAL ASSEMBLY,TAKE CARE TO KEEPHANDS AWAY FROM ANYPARTS THAT MAYSUDDENLY MOVE WHENTHE RETAINING FORCEIS REMOVED.USE SUPPORTS FOR ANYPARTS THAT COULD MOVE.

OPERATOR BOLTS REMOVED HOUSING LIFTED

CAM PIN REMOVAL

CAM PIN INSPECTION

COUPLING PIN REMOVAL

PACKING GLAND BOLTS EXPOSED

VALVE WITH OPERATOR REMOVED


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OPERATOR INSPECTION


1 Look for ice, dirt, or foreign objectsthat may interfere with freemovement.

2 Remove the cam pins (part no. 27)

one at a time and inspect fordamage or excessive wear. Seeinformation on cam pin change onpage 9. Replace each pin beforeremoving another one.

3 Replace with new pins if necessaryand investigate the cause ofdamage. Excessive force at thehandwheel may be the cause.

4 Remove the handwheel andbearing assembly from the top ofthe operator. Take special carewhen slackening thrust bearingretainer bolts (part no. 41), in case

the bearing is under a loadcondition. Check that the threadsof the stem (part no. 25) turn freelyin the matching threads of thedrive nut or cam (part no. 24).If there has been any threaddamage, replace both stem anddrive nut or cam.

5 Inspect thrust bearing (part no.91)for possible damage. Replace ifnecessary.

6 Gear housing, stem threads andguide pin slots are grease packedduring manufacture. Re-packingwith grease, after dismantling, isrequired.

7 When the operator has beenremoved from a GENERALTRUSEAL valve, the lower plateMUST NOT BE REMOVED withoutfirst ensuring that the plug is firmlyheld by its upper stem. There isa coupling hole through the upperstem, to which support may beattached.

Operators can be safely removedfrom GENERAL TRUSEAL valveswhile the pipeline system is underfull rated pressure and the valve isin the closed position.

If the Field Service Proceduresindicate a stiffness in theoperator, follow this sequenceof inspections until the problemis identified.

200 Series Operator 400 Series Operator


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GENERAL VALVE

Camerons Valves & Measurement Group Printed in Canada Revised 10/07-NP-3M IOM-GEN-TRUSEAL

3250 Briarpark Drive, Suite 300Houston, Texas 77042USA Toll Free 800 323 9160

For the most current contact and location information go to: www.c-a-m.com

Contact your Camerons Valves & Measurement group representative for a Repair Manual


Iom Gen Truseal 1

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