Parker Relieving Dial Regulators | 51R Series



  • 1/4" ports
  • Self-relieving
  • Pressure reference indicating dial face
  • Non-rising, pressure adjustment dial
  • Full pressure adjustment in less than one full turn
  • Recommended for pilot-air applications



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Part Numbers

Part Number*  Description

Port Size


Height (A)

mm (in)

Width (H)

mm (in)


Standard pressure - 5 to 160 psig (0.34 to 11 bar)

1/4" 0.7 71 (2.80)  56 (2.20)

Low pressure - 2 to 40 psig (0.14 to 3 bar)

1/4" 0.7 71 (2.80) 56 (2.20)

*For BSPP ports, add a "1" to the end of the part number.


Service Kits and Accessories

Part Number Description
RRP-16-024-80 Adjustment dial knob
RRP-95-906-80 Spring, regulation, Bellville washer - 2 to 40 psig
RRP-95-905-80 Spring, regulation, Bellville washer - 5 to 160 psig
RRP-95-765-80 Piston and bonnet repair kit
RRP-96-934-80 Valve, pilot with o-ring and valve spring

Technical Specifications


Flow Capacity: 0.7 scfm
Max Operating Temperature: 150°F
Max. Supply Pressure: 20.7 bar (300 psig)
Port Size: 1/4" (NPT, BSPP)
Weight: 1.3 lbs (0.5 kg)

Warning Triangle WARNING: These products can expose you to chemicals including lead and/or DEHP and/or carbon black, which are known to the State of California to cause cancer or birth defects or other reproductive harm.  For more information go to