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The minimum cracking pressure is the lowest differential pressure that is allowable in your system.
Lohms represent resistance in a fluid system.
Lohm is a measure of resistance to flow. The higher the Lohm rate, the more restrictive the flow. The maximum Lohm rating of the part is your flow criteria for the part.
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187 Zero-Leak PRI® Valve
Axial Flow, Zero Leak, Insert Retained Pressure Relief Valve 
Key Product Facts
  • Weighs only 1.5 grams
  • Relief Flow Lohm Rate: 2,500 Lohms max
  • Rated for Operating Pressure up to 3,000 psi
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281 Zero-Leak PRI® Valve
Axial Flow, Insert Retained, Zero Leak, Thermal Relief Valve with Integral Safety Screen
Key Product Facts
  • Weighs only 6 grams
  • Provides zero leakage and high crackikng pressures
  • Rated for Operating Pressure up to 4,000 psi
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375 Momentum PRI® Valve
Axial Flow, Insert Retained, High Flow, Pressure Relief Valve 
Key Product Facts
  • Weighs only 10 grams
  • Relief Flow Lohm Rate: 100 Lohms max
  • Rated for Operating Pressure up to 3,000 psi
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HI-Q PRV
Side Exit, Threaded, High Flow, Pressure Relief Valve 
Key Product Facts
  • Weighs only 200 grams
  • Relief Flow Lohm Rate: 75 Lohms max
  • Rated for Operating Pressure up to 5,000 psi
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281 PRI® Valve
Axial Flow, Insert Retained, Pressure Relief Valve 
Key Product Facts
  • Weighs only 4.5 grams
  • Relief Flow Lohm Rate: 220 Lohms max
  • Rated for Operating Pressure up to 3,000 psi
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187 TRI
Axial Flow, Insert Retained, Thermal Relief Valve with Integral Filter
Key Product Facts
  • Weighs only 2.6 grams
  • Optimized for Small Flows from Thermal Expansion
  • Rated for Operating Pressure up to 4,000 psi
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281 High Pressure PRI® Valve
Axial Flow, High Pressure Insert Retained, Pressure Relief Valve with Intergral Safety Screen
Key Product Facts
  • Weighs only 6 grams
  • Relief Flow Lohm Rate: 1,500 Lohms max
  • Rated for Operating Pressure up to 5,000 psi
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687 PRV
Side Exit, Threaded, Pressure Relief Valve 
Key Product Facts
  • Weighs only 38 grams (Screened Version 39 grams)
  • Relief Flow Lohm Rate: 230 Lohms max (Screened Version 300 Lohms max)
  • Rated for Operating Pressure up to 3,000 psi
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375 HD PRI® Valve
Axial Flow, Insert Retained, High Damped, Pressure Relief Valve
Key Product Facts
  • Weighs only 21 grams
  • Relief Flow Lohm Rate: 400 Lohms max
  • Rated for Operating Pressure up to 5,000 psi
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500 Momentum PRI® Valve
Axial Flow, Insert Retained, High Flow, Pressure Relief Valve 
Key Product Facts
  • Weighs only 20 grams
  • Relief Flow Lohm Rate: 50 Lohms max
  • Rated for Operating Pressure up to 3,000 psi
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250 High Pressure TRI
Axial Flow, Insert Retained, Thermal Relief Valve with Integral Filter
Key Product Facts
  • Weighs only 4.5 grams
  • Optimized for Small Flows from Thermal Expansion
  • Rated for Operating Pressure up to 5,000 psi
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187 PRI® Valve
Axial Flow, Insert Retained, Low Pressure Pressure Relief Valve 
Key Product Facts
  • Weighs only 1.5 grams (Screened Version 2.3 grams)
  • Relief Flow Lohm Rate: 1,100 Lohms max (Screened Version 1,500 Lohms max)
  • Rated for Operating Pressure up to 3,000 psi
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250 PRI® Valve
Axial Flow, Insert Retained, Pressure Relief Valve with Integral Safety Screen
Key Product Facts
  • Weighs only 4.5 grams
  • Relief Flow Lohm Rate: 4.500 Lohms max
  • Rated for Operating Pressure up to 3,000 psi
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375 High Pressure PRI® Valve
Axial Flow, High Pressure Insert Retained, Pressure Relief Valve 
Key Product Facts
  • Weighs only 20 grams
  • Relief Flow Lohm Rate: 400 Lohms max
  • Rated for Operating Pressure up to 5,000 psi
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