Parker RH4 Series Relief Valve

$204.57 / EA
  • Manufacturer: Parker Instrumentation
  • Product Family: RH4 Series
  • End 1 Type: Single Ferrule Compression
  • End 2 Size: 1/4 in.
  • End 2 Type: Single Ferrule Compression
  • Seal Material: Fluorocarbon
  • Temperature Rating: -10°F to 400°F (-23°C to 204°C)
  • End 1 Size: 1/4 in.
Parker CPI RH4 Series Rotary Plug Valve, 1/4" CPI™ Compression, RH4A Valve Series, Fluorocarbon Rubber Seal, PTFE Back-up Ring, Stainless Steel Body, Automatically Operated.

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Product Description

The Parker RH4A Series relief valve offers a range of pressure settings up to 6000 psig in eight different spring ranges. The settings are externally adjustable while the valve is in operation. A manual override option is available for pressures up to 1500 psig that permits users to relieve media independent of system pressure, while maintaining predetermined cracking pressure.


  • Pressure settings are externally adjustable
  • Blow-out and chip resistant molded seat design
  • 316 stainless steel construction standard
  • Back pressure has minimum affect on cracking pressure
  • Lock wire feature secures a given pressure setting
  • Color coded springs and labels for cracking range

Dimension Drawing