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Type C34 Main Valve

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Balanced Single Seat
Liquid Service
  • Normally Closed
  • Single Seat
  • Nitrile Diaphragm
  • Balanced Composition Disc
  • Protected Main Spring
  • Balanced Piston Design without Dashpot
  • Fluid Applications
  • Accurate Regulation for Non-violent Load Fluctuations
  • ANSI/FCI 70-2 Class VI Shutoff
  • Virtually Frictionless for Long Service Life
  • Packless Construction
  • Wide Variety of Pilots for Many Applications
Typical Configurations
  • Pressure Reducing - Type C34D
  • Air Adjusted - Type C34A
  • Back Pressure - Type C34Q
  • Pump Governor - Type C34P
  • Load Allocating - Type C34FD
  • Air Controlled - Type C34AP60
  • Electronic Slow Start - Type C34D208D
  • Solenoid Controlled - Type C34MD
  • Solenoid Actuated - Type C34M
  • Differential - Type C34N
  • Cooling Control - Type C34T
Application Data
  • Pressure Regulating for Liquid Distribution
  • Regulating for Process Control (Temperature or Pressure)
  • Maintain Back Pressure or Differential Pressure
  • For use with Self-contained, Pneumatic or Electronic Pilots
  • Single Point or Multiple Use Applications
  • Slow Start-up or Shutdown
The valve shall be self-operated, external pilot type, single seated, diaphragm actuated, normally closed design. The valve will shut tight on dead end service and shall maintain a discharge pressure which will not vary more than 10% (2 psi minimum) of set point from zero flow to rated flow regardless of inlet pressure variation. Valve shall be suitable for 200ºF (93ºC) service temperature. Bodies shall be cast iron. Sizes 2-1/2" and larger shall have flanged ends. Trim shall be stainless steel. Valves shall be equipped with a reversible composition disc. Diaphragms and discs shall be nitrile. There shall be no springs in the fluid space and no stuffing box.



1 to 6 in

Pressure at 200ºF

250 psig

Body Material

Cast Iron - ASTM A126 Cl. B

Stem Material

303 Stainless Steel ASTM A582

Disc Material

Nitrile Comp

Seat Material

1 - 2" - 303 Stainless Steel ASTM A582
2 1/2 - 6" - 304 Stainless Steel ASTM A276 Cond A

Gasket Material


Diaphragm Material


Spring Material



EZ Connections


·  Valve Rating (Type C34 Main Valve)

·  Dimensions & Weight (Type C34 Main Valve)

·  Rated Flow Coefficients (Type C34 Main Valve)


Main Valve Options
(PDF, 192KB)

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