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IOM-3381/4381

7

Option-20, Dome Loaded

MODEL 3381

 

 

 

Repair Parts

 

Item No.  Description 

  Kit B

 

Body

 

Spring Chamber

 

Pressure Plate

 

Pusher Plate

 

Spring Button

 

Body Cap

 

Piston Spring --------  

‡‡

 

Adjusting Screw

 

Lock Washer

 

10 

Pressure Plate Nut

 

11 

Adjusting Screw Locknut

 

12 

Nameplate

 

13 

Diaphragm -----------  

‡‡

 

14 

Diaphragm Gasket(s) 

‡‡

 

15 

Pusher Plate Gasket  

‡‡

 

16 

Piston  -----------------  

‡‡

 

17 

Range Spring

 

18 

Handwheel

 

19 

Mounting Nut

Figure 1:

Basic Model 3381 with Metal Seat Design

Composition Seat Design

(

NOTE:  Mount in Horizontal line with 

Adjusting Screw down as shown.)

Figure 2:

Option-5 Cryogenic Model 3381, Metal Seat Design

Option-22 Panel Mounting 

(Handwheel portion is same as Option-2 Handwheel)

Summary of Contents for 3381

Page 1: ...n sight 5 Allinstallationsshouldincludeadownstreamrelief device if the inlet pressure could exceed the pres sure rating of any downstream equip ment or the maximum outlet pressure rating of the unit 6...

Page 2: ...mplete diaphragm failure will cause the regu lator to fail open 10 A Basic Regulator Refer to Figure 1 Model 3381 or 4381 Regulator may be rotated around the pipe axis 360 Recommended position is with...

Page 3: ...ultiple metal diaph ragms may be stacked 6 Loosen pusher plate nut 10 and separate all parts 3 4 9 13 15 of the diaphragm subassembly 7 Inspect pressure plate 3 to ensure no deformation due to over pr...

Page 4: ...if worn nickedordepressed Ifintegralseatisnicked useseatlappingcompoundtoremove Valves 8 Remove diaphragm s 13 and diaphragm gasket s 14 9 Clean body 1 and diaphragm flange Do not scratch diaphragm ga...

Page 5: ...develop bubble tight shutoff In general tighter shutoff can be expected with composition seat 11 Pressurize with air and spray liquid leak de tector to test around body cap 6 and body 1 for leakage Te...

Page 6: ...r and Product Code that was stamped on the metal name plate and attached to the unit This information can also be found on the Bill of Material parts list that was provided when unit was originally sh...

Page 7: ...Plate Nut 11 Adjusting Screw Locknut 12 Nameplate 13 Diaphragm 14 Diaphragm Gasket s 15 Pusher Plate Gasket 16 Piston 17 Range Spring 18 Handwheel 19 Mounting Nut Figure 1 Basic Model 3381 with Metal...

Page 8: ...e Spring Chamber Construction Option 2 80 Handwheel NOT available with Option 22 Repair Parts Item No Description Kit B 1 Body 2 Spring Chamber 3 Pressure Plate 4 Pusher Plate 5 Spring Button 6 Body C...

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