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Series 436/438 Valves

The Series 436 and 438 Valves can be used in a variety of applications that require a steel bodied valve. This could include high or low pressure separators, treaters, dehydrators, or any other pressure vessel.

Series 436 Features

  • Meets ANSI Flanged Dimensions - Perfect for Offshore Applications
  • Proven Closed Yoke Design - Reduces the chance of debris entering the valve
  • NACE Adaptable - Can be modified for use in sour service

 

Specifications 

Body Material   Steel  Maximum Working Pressure   See Chart  
Body Cover   Steel  Temperature Limits   -40 F to 250 F (-40 C to 121 C)
End Connections   Flanged  Valve Travel   1-1/8 Inches 
Diaphragm Cases   Steel  Spring Rate  750 lbs. per inch 
Diaphragm  65 sq. in. Reinforced Buna N
Max. Recommended Pressure 70 psi  
Spring Pre-load  (3-15 psi Bench Range)
Normal 210 lbs. Maximum 750 lbs. 
Packing  1/2" x 1" Non-Lubricated Packing   Flow Direction  Under the seat for precise modulation.
Over the seat for shut-in service, on-off service
non-critical modulation. 
Stem Seat Plug   303 Stainless Steel, Viton Facing   Trim  Modified equal percentage 

 

Series 438

The Series 438 Valve is perfect for offshore vessels.

Features

  • Meets ANSI Flanged Dimensions - Perfect for Offshore Applications.
  • Hammer Union Construction - Reduces downtime for repair.
  • NACE Adaptable - Can be modified for use in sour service.
  • Proven Closed Yoke Design - Reduces the chance for debris entering the valve.

 

Specifications

Temperature Limits   -40 F to 250 F (-40 C to 121 C) End Connections   Flanged 
Stem 303 S.S.  Diaphragm Operator   Steel, 80 sq. in. , Nylon Reinforced Buna N Diaphragm
100 psi Maximum Working Pressure  
Seat and Plug  See Ordering Information pdf located on the side of this page.  Packing  Non-Lubricated Packing  
Body Material   Cast Steel A-216-WCB   Maximum Working Pressure   1440 ps  
Body Cover   Steel A-105 GR2, Union      

 

General Notes

1. Standard topworks is direct action (normally closed) with 65 sq. in. effective area

2. Cv and Cg values are for fully open inner valve

3. Stock numbers applicable only when valve desired is exactly as described above

4. To order specify model number, stock number, and trim description

5. See the parts pdf located below