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GE Oil & Gas

- VariPak valves with Cv max. 3.8 do not have seatring 

gaskets (2).

5.4 REASSEMBLY (Figures 5, 15, 19, 20, 24, 25, 26, 27, 
28 and 29)
Before reassembly, thoroughly clean the inside of the 
valve body and parts, paying particular attention to 
gasket seating surfaces and contact surfaces. Make 
sure to use a new seat-ring gasket (2) and new packing 
(6) during reassembly.

A.  Insert a new seat-ring gasket (2) into valve body (13), 

then fit seat ring (3), making sure that the gasket is 
correctly centered on the seat-ring shoulder. Turn it 
so that one of its ports is lined up with the valve body 
outlet orifice.

Note: If the maximum Cv is less than 0.10, first fit the 

seat ring (3e) on the new gasket (2), taking the same 
precautions as above. Then fit the spacer (3f), turning it 
so that one of its ports is turned towards the body outlet 
orifice.
VariPak valves with a maximum Cv of 3.8 do not include 

a seat-ring gasket (2).

B.  Carefully apply Never Seez grease or equivalent to 

the threads and bottom of the seat-ring retainer 
(4). Using a 9/16" or 14 mm piece of hex stock and a 
wrench, torque the retainer to 59 ftlb or 8 daN.m for 
stainless-steel reinforced graphite gaskets or 40 ft-lb 
or 5.5 daN.m for glass-filled PTFE gaskets (see figure 
19).

Note: Torque the retainer to 30 ft-lb or 4 daN.m for 
valves with a maximum Cv of 3.8.
C.  Insert the plug and stem assembly into the seat 

ring. For valves with a maximum Cv < 0.10, check 

that there are no friction points in the plug stroke. 
If a friction point is detected, loosen retainer (4) 
and reposition seat ring (3e) until the stem slides 
smoothly. Fit spacer (5), turning it so that one of its 
holes is aligned with safety pin (11) hole in the valve 
body.

Note: For valves with a maximum Cv less than 0.10, 

check that the retaining ring (182) is fitted on the plug 
before fitting the plug in the spacer (3f). If the retaining 
ring is worn or damaged, replace it.

 

Figure 19 - Tightening the seat-ring retainer (4)

D.  Wind two layers of PTFE tape around the safety pin 

(11). Screw the pin into the bonnet five and a half to 
six turns as from the thread engagement point.

 

Note: To determine the thread engagement point:

 

- Screw the safety pin about one turn.

 

- Pull the safety pin out while unscrewing it.

E.  Fit the packing, making sure that the skive cut of 

each packing ring is located 120° away from the that 
of the adjacent ring. Push the rings down slightly 
using a 1/2" sch., size 160 tube. Fit the packing 
follower (9) onto the plug stem. 

F.  Fit actuator bracket (108) and secure it with two 

nuts (8a). Slip packing flange (10) onto plug stem. 
Handtighten the two packing flange nuts and add 
one full turn with the wrench.

G.  Fit, in the following order, grommet plate (101), 

conical compression spring (106) and its spring 
button (102) (see position in figure 26 and 27). Screw 
nut (103) and clevis (104a) on the plug stem.

Adjust the nut and clevis without locking them together 
until the clevis holes are positioned approximately:

 

-  2.3 mm below the alignment of the pin holes in 

the actuator bracket (108) for the VariPak 28001 
single-lever valve (see figure 15).

 

-  1.5 mm above the alignment of the pin holes in 

the actuator bracket (108) for the VariPak 28002 
adjustable-Cv valve (see figure 20).

Note: Measuring this distance can be simplified by fitting 
pins (105), (184) and (18) into their holes.

Summary of Contents for Masoneilan VariPak 28000 Series

Page 1: ...GE Oil Gas 28000Series Masoneilan VariPak Adjustable Cv Control Valves Instruction Manual ...

Page 2: ...MENT AT THE SITE THESEINSTRUCTIONSDONOTPURPORTTOCOVERALLDETAILSORVARIATIONSINEQUIPMENT NOR TO PROVIDE FOR EVERY POSSIBLE CONTINGENCY TO BE MET IN CONNECTION WITH INSTALLATION OPERATION OR MAINTENANCE SHOULD FURTHER INFORMATION BE DESIRED OR SHOULD PARTICULAR PROBLEMS ARISE WHICH ARE NOT COVERED SUFFICIENTLY FOR THE CUSTOMER OPERATOR S PURPOSES THE MATTER SHOULD BE REFERRED TO GE THE RIGHTS OBLIGAT...

Page 3: ... 10 3 3 Pneumatic and Electrical Circuit 11 3 4 Limit Switches 11 4 Calibration 12 4 1 Piston Rod Clevis Adjustment 12 4 2 Plug Stem Adjustment 12 4 3 Limit Stop Adjustment 13 4 4 Varipak 28002 Cv Adjustment 14 4 5 Positioner Start Up Pressure Adjustment 14 5 Maintenance 14 5 1 Actuator Diaphragm Removal 14 5 2 Adding Packing Ring 14 5 3 Disassembly 15 5 4 Reassembly 16 5 5 Packing Quick Change Me...

Page 4: ... GE has a highly skilled After Sales Department to assist customers with start up maintenance and repair of valves and instruments Contact your nearest GE Sales Office or Representative or the After Sales Department at the Condé sur Noireau plant in France 1 3 TRAINING GE organizes regular training courses in the operation maintenance and application of its Masoneilan control valves and instrument...

Page 5: ...tly be calibrated on site between 0 004 and 0 010 2 2 FLOW COEFFICIENT OF VARIPAK 28001 SINGLE LEVER AND 28002 ADJUSTABLE Cv VALVES 2 2 1 Plug seat ring combinations trim Eight plugs and five seat rings are used to make up the ten available plug and seat ring combinations identified by codes from 0 to 9 see figure 2 The shape of each plug and the port diameter of the seat ring can be used to match...

Page 6: ...nation The plug and seat ring combination can be changed very easily for trim Nos 1 to 9 inclusive Simply replace the following parts The plug and seat ring see figures 1 and 2 to select the combination required for the new Cv The Cv adjustment plate 25 in the case of the VariPak 28002 adjustable Cv valve If necessary the actuator spring 134 see figure 3 to check the spring range corresponding to ...

Page 7: ...e adjustment knob again firmly Note This operation entails moving lever No 2 either pneumatically by allowing air into the actuator or manually by pressing piston clevis 140b with a screwdriver or similar tool so that the slides of the two levers are perfectly parallel It may be necessary to reset the zero to calibrate the closure point after changing the Cv 2 3 ACTUATOR A single actuator allows V...

Page 8: ...ew 116 Unhook spring 114 from spring clamp 115 2 5 1 VariPak 28001 single lever valve E Remove retainer clips 112b from pin 18 and remove the pin from lever 113 and plug clevis 104a Note This operation will be simplified by relieving the load exerted on the plug clevis by the conical compression spring 106 To do this push against the plug stem end with a screwdriver while driving out the pins F Re...

Page 9: ...cover 110 using the two screws 109 If the valve is equipped with a handwheel refit the cover and turn the handwheel clockwise so that it engages in lever arm stop 122 Tighten cover screws 109 N Put the valve back into service Note When replacing an Air to Close actuator with an Air to Open actuator do not forget to neutralize the limit stop by screwing it down at the bottom of the piston When repl...

Page 10: ...ned stainless steel All the line bolting required for installation can be supplied by GE on request Figure 7 VariPak flanged connection Connected by 25 mm flanges machined to standards ISO PN 20 50 and 100 ANSI 150 300 and 600 lb Fit gaskets compatible with service conditions between the valve body and the pipe flanges Figure 8 VariPak flanged body The VariPak valve body can be supplied on request...

Page 11: ...Check that the supply pressure is that indicated on the serial plate 7700P or 7700E positioners can be installed on both VariPak 28001 single lever and VariPak 28002 adjustable Cv valves Figure 11 Connections with 7700P positioner Figure 12 Connections with 7700E positioner 3 4 Limit Switches Figure 13 In some cases limit switches can be provided for the VariPak valve on request These are wired an...

Page 12: ...nst indicator Check that indicator 126 is correctly positioned Release air pressure 4 1 2 Adjusting the piston rod clevis on the Figure 14 Piston rod clevis 104b adjustment VariPak 28002 adjustable Cv valve Figures 14 and 27 This adjustment is only required if the piston 131 has been removed In this case it should be carried out during reassembly before coupling the levers 21 and 22 to the clevise...

Page 13: ...e the air pressure after inserting the shim At this closing point where the plug is not tightened onto the seating the slides of levers No 1 and 2 should be perfectly parallel This characteristic makes it possible to change the adjustment knob 24 position later to obtain the required real Cv value B Loosen adjustment knob 24 and slide it along lever No 1 to the maximum Cv position on adjustment pl...

Page 14: ... in the valve actuator or positioner before maintenance or disassembly 5 1 ACTUATOR DIAPHRAGM REMOVAL Figures 17 24 25 26 and 27 A Unscrew the two pressure connection nuts 138a and pull tubing 140 out Remove the four cap screws 139 and diaphragm cover 137 Remove the worn diaphragm Form new diaphragm 136 and fit it on the piston as shown in figure 17 Fit the diaphragm roll into the bracket groove T...

Page 15: ...tely loosen locknut 117 and screw 116 Remove spring clamp 115 from lever No 2 and remove balance spring 114 from the positioner E Remove the retainer clip 112b from each of the two pins 184 and disengage the pins from lever No 1 and clevis 104a Note This operation will be simplified by relieving the load exerted on the plug clevis by the conical compression spring 106 To do this push against the p...

Page 16: ...at ring 3e until the stem slides smoothly Fit spacer 5 turning it so that one of its holes is aligned with safety pin 11 hole in the valve body Note For valves with a maximum Cv less than 0 10 check that the retaining ring 182 is fitted on the plug before fitting the plug in the spacer 3f If the retaining ring is worn or damaged replace it Figure 19 Tightening the seat ring retainer 4 D Wind two l...

Page 17: ...lever No 2 where spring clamp 115 is fitted is located above and in line with balance spring 114 I Fit adjustment pin 23 in the slide of lever No 1 and screw adjustment knob 24 on its threaded end Insert the smooth end of pin 23 into the groove in lever No 2 and place lever No 1 on support bracket 108 Couple lever No 1 to actuator bracket 108 using pin 105 and two retainer clips 112a Note Check th...

Page 18: ...oved while the valve is still pressurized The internal parts of the valve cannot be removed unless the safety pin is removed first Remove the two packing flange nuts 8b and back off the two actuator bracket mounting nuts 8a as far as possible C Remove the actuator plug assembly from the valve body tapping it off with a block of wood and mallet if necessary Clean the packing box in the valve body R...

Page 19: ...6 and its three O rings spring 158 and manifold block 144 Tighten the screws 141a refit tubing 140 and tighten pressure connection nuts 138a Note The ports in gasket 146 must be aligned with those in the positioner block 147 To ensure correct positioner performance check that all gaskets are perfectly leaktight I Hook spring clamp 115 to lever 22 or 113 In the case of VariPack 28001 valve see figu...

Page 20: ...w parts Otherwise simply check that parts are in perfect condition before refitting Caution Handle the shims carefully 145 C If the parts mentioned above have been removed proceed as follows Fit the O ring 153 shims 145 pilot valve assembly 155 to 157 gasket 146 and the three O rings the spring 158 and manifold block 144 I P module 20 Tighten screws 141a refit tubing 140 and tighten pressure conne...

Page 21: ...Δ 161 4 Washer c 1 Plug stem Cv max 1 2 0 6 122 1 Lever arm stop Δ 162 4 Nut d 1 Plug stemCv max 0 25 0 10 123 1 Cover plug Δ 163 4 Wire 13 a 1 Body Cv max 3 8 124 1 Pivot pin No 4 Δ 164 1 Terminal 13 b 1 Body Cv max 3 8 125 1 Locknut 165 2 Logo 18 1 Pivot pin No 3 22 108 126 1 Indicator 168 1 Cover washer 20 1 I P module 127 1 Indicator plate 170 2 Signal decal 21 1 Lever No 1 129 2 Indicator pla...

Page 22: ...22 GE Oil Gas 180 181 Figure 25 Cross section of the VariPak 28001 single lever actuator and the 7700E positioner Figure 26 Partial cross section of VariPak 28001 single lever air to open valve ...

Page 23: ...24 GE Oil Gas Figure 27 Partial cross section of VariPak 28002 adjustable Cv air to open valve Figure 29 Coupling detail of levers No 1 and 2 Figure 28 Partial top view 180 181 ...

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