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

Body Cover
Steel

End Connections
Flanged

Diaphragm Cases
Steel

Diaphragm
65 sq. in. Reinforced Buna N
Max. Recommended Pressure 70 psi

Packing
1/2" x 1" Non-Lubricated Packing

Stem Seat Plug
303 Stainless Steel, Viton Facing

Maximum Working Pressure
See Chart

Temperature Limits
-40°F to 250°F

Valve Travel
1-1/8 Inches

Spring Rate
750 lbs. per inch

Spring Pre-load
(3-15 psi Bench Range)
Normal 210 lbs. Maximum 750 lbs.

Flow Direction
Under the seat for precise modulation.
Over the seat for shut-in service, on-off service
non-critical modulation.

Trim
Modified equal percentage

Series 438 Features

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

Stem
303 S.S.

Seat and Plug
See Ordering Information pdf located on the side of this page.

Body Material
Cast Steel A-216-WCB

Body Cover
Steel A-105 GR2, Union

End Connections
Flanged

Diaphragm Operator
Steel, 80 sq. in. , Nylon Reinforced Buna N Diaphragm
100 psi Maximum Working Pressure

Packing
Non-Lubricated Packing

Maximum Working Pressure
1440 ps

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, Trim Description.

5. See the parts pdf located on the left side of the page.