Relief Valves

Rv20prd

Relief valves are a type of valve used to control or limit the pressure in a system or vessel which can build up by a process upset, instrument or equipment failure, or fire.


Type/Model No./Cavity Pressure Flow Uses Characteristics  
Direct-Acting Poppet

Direct-Acting Poppet

High pressure for demanding for demanding applications.

Model: RVD50-20; Cav: 10-2

 

5075 psi/350 bar; (30 gpm/114 lpm)

  • Safety relief
  • Low leakage
  • Very low hysteresis
  • Continuous duty
  • Medium flow range
  • Stable


 

  • Extremely fast response
  • Very low pressure rise
  • Smooth, quiet relief
  • Contamination-tolerant
  • Consistent pressure setting
Direct-Acting Poppet 2

Direct-Acting Poppet

Model: RV08-20; Cav: 08-2

Model: RV58-20; Cav: 08-2

Model: RV10-20; Cav: 10-2

Model: RV08-29; Cav: 08-2

 

3600 psi/248 bar

5000 psi/345 bar

3300 psi/228 bar

3500 psi/241 bar

  • Safety relief
  • Low flow range
  • Low internal leakage
  • RV58-20 may not be used for cross-over relief applications
  • Inexpensive
  • Fast response
  • Contamination-tolerant
  • Higher flow stability


 

Differential-Area Poppet

Differential-Area Poppet

Model: RV08-22; Cav: 08-2

Model: RV10-22; Cav: 10-2

Model: RV50-22; Cav: 10-2

 

3600 psi/248 bar

3500 psi/241 bar

5000 psi/345 bar

  • Medium flow range
  • Low hysteresis
  • Very low internal leakage
  • Continuous duty
  • RV50-22 may not be used in cross-over relief applications
  • Extremely fast response
  • Higher reseat resistance
  • Low pressure rise
  • Accurate


 

Differential-Area Reverse Flow

Differential-Area Poppet, Reverse Flow

Model: RV10-23; Cav: 10-2A

 

3500 psi/241 bar

  • Low leakage
  • Low hesteresis
  • Medium flow range
  • Continuous duty
  • Fast response
  • Reseat at 90% of crack pressure
  • Low pressure overshoot

Pilot-Operated Poppet

Model: RV10-24

 

-

 

-Obsolete-

 

-

 

-

Pilot-Operated Spool

Pilot-Operated Spool

Model: RV10-26; Cav: 10-2

Model: RV50-26; Cav: 10-2

Model: RV12-26; Cav: 12-2

Model: RV52-26; Cav: 12-2

Model: RV16-26; Cav: 16-2

Model: RV56-26; Cav: 16-2

 

3500psi/241 bar

5000 psi/345 bar

3500 psi/241 bar

5000 psi/345 bar

3500 psi/345 bar

5000 psi/345 bar

 

  • High flow range
  • Pilot leakage
  • Continuous duty
  • Low hysteresis
  • No cross-over relief
  • Varying load conditions

 

 


  • Very quiet
  • Stable pressure relief
  • Higher pressure rise
  • Contamination tolerant
  • Reseat at 90% of crack pressure
Pilot-Operated Spool Reverse

Pilot-Operated Spool, Reverse Check

Model: RV10-28; Cav: 10-2A

3500 psi/241 bar
  • Low leakage
  • Low hysteresis
  • No cross-over relief
  • Fast response
  • Reverse free flow
  • Low pressure overshoot
Direct-Acting

Direct-Acting Bi-Directional

Model: CR10-28; Cav: 10-2

Model: CR08-38; Cav: 08-3

 

 

3500 psi/240 bar

3500 psi/241 bar

  • Low flow range
  • Low leakage
  • Continuous duty
  • Profits back pressure
  • Fast response
  • Reseat at 90% of crack pressure
Cross-Over Direct-Acting

Cross-Over Direct-Acting Poppet

Model: CRV08-20; Cav: N/A

Model: CRV10-20; Cav: N/A

 

 

3300 psi/228 bar

3500 psi/241 bar

  • Protection from load-induced pressure surges
  • Low flow range
  • Low internal leakage
  • Extremely fast response
  • Contamination tolerant
  • Poor pressure-rise characteristics
Cross-Pver Differential-Area

Cross-Over Differential-Area Poppet

Model: CRV08-22; Cav: N/A

Model: CRV10-22; Cav: N/A

 

 

2600 psi/180 bar

3500 psi/241 bar

  • Medium flow range
  • Protection from load-induced pressure surges
  • Low internal leakage
  • Extremely fast response
  • Smooth response to pressure surges
Thermal Relief

Thermal Relief

Model: TR04-B20; Cav: 04-B2

 

6000 psi/414 bar

  • Relief of pressure-induced thermal intensification
  • Low leakage
  • 10 drops/minute at 85% of pressure setting
  • Withstands high pressure