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921 Series Pressure Regulator

Brand: Trerice Gauges & Valves
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The Trerice 921 Series Pressure Regulator is fully self-contained and requires no external power source. This regulator requires that a user-supplied pressure sensing line be connected from the controlled point to the diaphragm actuator.

Pressure in this line acts upon the diaphragm to develop the necessary thrust to stroke the valve, thereby maintaining the system at the desired condition.

For pressure reducing applications, the pressure sensing line is mounted downstream, and the valve closes as this sensed pressure increases. Reduced outlet pressure not to be less than 10% of inlet pressure.

For back pressure relief applications, the sensing line is mounted upstream, and the valve opens as the sensed pressure increases.

Suitable for a variety of pressure regulating and pressure reducing applications.
Features
  • Self-Operating Design
  • Spring-Loaded Diaphragm Actuated
  • Cast Ductile Iron Housing & Yoke
  • ½" - 6" Valve Sizes

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Specifications

Brand

Actuator Models

  • 921PRV: Pressure Reducing Valve
  • 921BPR: Back Pressure Relief

Housing

  • Cast Ductile Iron, Black Finish

Pressure Plate

  • Cast Iron

Diaphragm Material

  • Nylon Reinforced Neoprene

Regulated Pressures

  • 2-100 psi

Maximum PRV Inlet Pressure

  • 1/2” - 2”: 200 psi
  • 2-1/2” - 6”: 125 psi, 200 psi inlet available with Class 250 flanged valve body. Consult Factory

Maximum BPR Set Pressure

  • 100 psi

Pressure Connection

  • 1/4” NPT

Adjustment Nut

  • Steel

Adjustment Screw

  • Brass

Adjustment Spring

  • Cadmium Plated Steel

Body Material

  • 1/2” - 2”: Bronze
  • 2-1/2” - 6”: Cast Iron

Trim Material

  • Stainless Steel

Trim Style

  • Quick-Opening

Connection

  • 1/2” - 2”: Threaded, Malleable Iron Union Ends
  • 2-1/2” - 6”: Class 125 Flanged

Pressure & Temperature Rating

  • 1/2” - 2”: 250 psi @ 410° F (210° C)
  • 2-1/2” - 6”: 125 psi @ 350° F (175° C)

Documentation

Data Sheets

Manuals

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