General Pump Datasheets for Pressure Relief Valves

Pressure relief valves are self-actuated safety valves designed to relieve excess pressure upstream from the line.
Pressure Relief Valves: Learn more

Product Name Notes
316 Stainless Steel Pressure Trapping Unloader/Regulator General Pump, along with our parent company, Interpump Group S.r.l., has been the world leader in plunger pump development since 1982. While known as...
316 Stainless Steel Regulating Valve Features Strong construction in 316 Stainless Steel High performance in compact design New Teflon back-up ring for longer life and smooth operation Adjustable lock-nut to...
Adjustable Reduced Pressure Unloader General Pump, along with our parent company, Interpump Group S.r.l., has been the world leader in plunger pump development since 1982. While known as the leader...
Adjustable Trapped Pressure Unloader Features Sturdy steel and brass construction Adjustable locknut to control max pressure Easy maintenance Hexagonal discharge check valve to prevent jamming
Automatic Pressure Regulating Valve Features Regulates operating pressure of the system by releasing excess volume through the by-pass. Protects the system from over pressurization.
Automatic Pressure Regulating Valve General Pump, along with our parent company, Interpump Group S.r.l., has been the world leader in plunger pump development since 1982. While known as the leader...
Balanced relief valve/unloader with no check valve Trapped pressure type unloader - ideal for use in systems which incorporate a gasoline engine; eliminates back pressure in system when pulling a...
Balanced relief valve General Pump, along with our parent company, Interpump Group S.r.l., has been the world leader in plunger pump development since 1982. While known as the leader in...
Check Valve, Brass Features Light Cracking Pressure Brass Body with Stainless Wetted Parts O-ring on Poppet for a Leak Proof Seal Solid Body Construction, Won’t Come Apart During Installation
Check Valve, Stainless Steel Features Light Cracking Pressure Stainless Body with Stainless Wetted Parts O-ring on Poppet for a Leak Proof Seal Solid Body Construction, Won’t Come Apart During Installation...
Direct Mount Control Set Unloader For EP Series Pumps Features Direct-mount, control set unloader Used with ET, EP and ES series pumps Built-in bypass Sturdy steel and brass construction Adjustable...
Direct Mount Control Set Unloader For EZ 47, 60 and 63 Series Pumps, optional 2.1mm injector Features Direct-mount for EZ 47, 60 and 63 series pumps Sturdy steel and brass...
Direct Mount Control Set Unloader For EZ Series Pumps General Pump, along with our parent company, Interpump Group S.r.l., has been the world leader in plunger pump development since 1982.
Direct Mount Control Set Unloader For EZ, 47, 60 and 63 Series Pumps, With 2.1 MM Injector General Pump, along with our parent company, Interpump Group S.r.l., has been the...
Direct Mount Control Set Unloader For EZ, 47, 60 and 63 Series Pumps A direct-mount, adjustable, trapped pressure type unloader with built in bypass and plastic knob.
Direct Mount or Long Body Unloader with 2.2 or 2.5 mm Injector Reduces cost - eliminates the need for fittings and bypass hose Compact design - features forged brass body...
Direct Mount Unloader with Chemical Injector, Pressure Gauge and Filter General Pump, along with our parent company, Interpump Group S.r.l., has been the world leader in plunger pump development since...
Direct Mount Unloader with or without 2 mm Injector Reduces cost - eliminates the need for fittings and bypass hose Compact design - features forged brass body and hardware Versatile...
Direct Mount, Control Set Unloader For TT/TP Series 51 Pumps Features Direct-mount, trapped pressure Built-in bypass Sturdy steel and brass construction Adjustable locknut to control the maximum pressure Plastic knob...
Direct Mount, Control Set Unloader For TT/TP Series 51 Pumps General Pump, along with our parent company, Interpump Group S.r.l., has been the world leader in plunger pump development since...
Direct Mount, Control Set Unloader for Use With EZ, 47, 60 and 63 Series Pumps, Optional 1.8 MM Injector Features Direct-mount, control set unloader Used with 44, 47, 50, 60,...
Direct Mount, Control Set Unloader, Available With or Without Injector General Pump, along with our parent company, Interpump Group S.r.l., has been the world leader in plunger pump development since...
Easy Start Valve, Provides Easy Start for Manual Start Gas Engines, SS Seat and Ball Features Maximum working pressure = 5,000 psi Eases system start-up. Especially useful for engine-driven pressure...
Easy Start Valve, Provides Easy Start for Manual Start Gas Engines Features Maximum working pressure = 5,000 psi Eases system start-up. Especially useful for engine-driven pressure washers Fits any brand...
Easy Start Valve Eliminates back pressure when pulling a manual start gas engine.
Flow Sensitive Unloader (optional 6 amp microswitch) Features Near total zero setting of the outlet pressure at gun closure increases safety Reduced pressure loss Makes for easier gun operation Extremely...
Flow Sensitive Unloader (optional 6 Amp Microswitch) General Pump, along with our parent company, Interpump Group S.r.l., has been the world leader in plunger pump development since 1982. While known...
Flow Sensitive Unloader, 303 Stainless Steel Features Near total zero setting of the outlet pressure at gun closure increases safety Reduced pressure loss Makes for easier gun operation Extremely reliable...
Flow Sensitive Unloader, 303 Stainless Steel General Pump, along with our parent company, Interpump Group S.r.l., has been the world leader in plunger pump development since 1982. While known as...
Flow Sensitive Unloader. Optional: 6 Amp Microswitch, 3.5 and 4.5 Orifice Features Near total zero setting of the outlet pressure at gun closure increases safety Reduced pressure loss Makes for...
Flow Sensitive Unloader Features All stainless and brass internal parts. No external moving parts or springs. Unique balance nozzle principle: Eliminates high pressure in all lines while unit is in...
Flow Sensitive Unloader Features Compact - Low profile saves space Dual Auxiliary Ports - Allows for easy installation of pressure operated accessories Reliability - No discharge check valve means higher...
Flow Sensitive Unloader Features Features all stainless and brass internal parts. New design reduces sensitivity to entrapped air. No external moving parts or springs. Eliminates high pressure in all lines...
Flow Sensitive Unloader Features Features all stainless and brass internal parts. No external moving parts or springs. Unique balance nozzle principle: Eliminates high pressure in all lines while unit is...
Flow Sensitive Unloader Features Unique, flow-balanced piston permits precise pressure adjustments, while safety eliminating discharge line pressure when in bypass Features all stainless or brass internal parts with no external...
Hot Water Safety Relief Valve – 303 Stainless Steel FEATURES High pressure safety valve: 1500-4500 PSI relief pressure Designed for reduced back pressure compared to most models Less “whistling” and...
Industrial Safety Relief Valve, Stainless Steel Features Limits the pressure at the max working pressure of the system When the max working pressure is exceeded it opens and discharges the...
Industrial Safety Relief Valve, Stainless Steel Features Regulates the operating pressure of the system by releasing excess volume through the by-pass Protects the system from over pressurization
Industrial Safety Relief Valve Features Duty: It limits the pressure at the max working pressure of the system How it works: When the max working pressure is exceeded it opens...
Industrial Safety Relief Valve Features Limits the pressure at the max working pressure of the system When the max working pressure is exceeded it opens and discharges the total pump...
Industrial Safety Relief Valve Features Limits the pressure to the maximum working pressure of the system. When the max working pressure is exceeded it opens and discharges the total pump...
Industrial Safety Relief Valve Features Regulates the operating pressure of the system by releasing excess volume through the by-pass Protects the system from over pressurization
Industrial Safety Relief Valve General Pump, along with our parent company, Interpump Group S.r.l., has been the world leader in plunger pump development since 1982. While known as the leader...
Industrial Safety Valve Features Limits the pressure to the maximum working pressure of the system. When the max working pressure is exceeded it opens and discharges the total pump flow,...
Industrial Unloader, automatic Features Sturdy construction in stainless steel and brass Bypass control actuates at very low pressure values, with reduced pressure in the delivery line when gun is closed...
Industrial Unloader, automatic General Pump, along with our parent company, Interpump Group S.r.l., has been the world leader in plunger pump development since 1982. While known as the leader in...
Industrial unloader, manual bypass lever and automatic operation General Pump, along with our parent company, Interpump Group S.r.l., has been the world leader in plunger pump development since 1982. While...
Industrial Unloader Features Features new, lighter design and hot water capability Regulates operating pressure of the system by releasing excess volume through the by-pass. Protects the system from over pressurization.
Industrial Unloader General Pump, along with our parent company, Interpump Group S.r.l., has been the world leader in plunger pump development since 1982. While known as the leader in plunger...
Long Body Unloader Without Injector Reduces cost - eliminates the need for fittings and bypass hose Compact design - features forged brass body and hardware Versatile - mounts in seconds...
Premium Pressure-compensating Unloader min-max setting, Stainless Steel Check Valve, Brass Knob General Pump, along with our parent company, Interpump Group S.r.l., has been the world leader in plunger pump development...
Pressure Trapping Unloader in 316 Stainless Steel Features Control - Adjustable high and low pressure limits protects equipment from damage. Convenience - Large handle allows for easy adjustment and is...
Pressure Trapping Unloader in 316 Stainless Steel General Pump, along with our parent company, Interpump Group S.r.l., has been the world leader in plunger pump development since 1982. While known...
Regulating Valve General Pump, along with our parent company, Interpump Group S.r.l., has been the world leader in plunger pump development since 1982. While known as the leader in plunger...
Safety Relief Valve, End Discharge, 316 Stainless Steel FEATURES High pressure safety valve: 3,500 - 6,000 PSI relief pressure Less “whistling” and chatter than competing brands Highly accurate over full...
Safety Relief Valve, End Discharge FEATURES High pressure safety valve: 1,000–6,000 PSI relief pressure One model fits all pressures – no springs to change Less “whistling” and chatter than competing...
Safety Relief Valve, Side Discharge With Hose Barb FEATURES High pressure safety valve: 1,000–6,000 PSI relief pressure One model fits all pressures – no springs to change Less “whistling” and...
Safety Relief Valve, Side Discharge Features Brass and Stainless Steel Construction Fully Adjustable Protects system components from over- pressure conditions
Safety Relief Valve, Side Discharge FEATURES High pressure safety valve: 1,000–6,000 PSI relief pressure One model fits all pressures – no springs to change Less “whistling” and chatter than competing...
Safety Relief Valve, Side Discharge General Pump, along with our parent company, Interpump Group S.r.l., has been the world leader in plunger pump development since 1982. While known as the...
Safety Relief Valve Features The ZKSR is a pressure relief which permits regulation of the bypass pressure: As a pressure relief and regulating valve, for flow rate of 1.6 to...
Steam Valve General Pump, along with our parent company, Interpump Group S.r.l., has been the world leader in plunger pump development since 1982. While known as the leader in plunger...
Trapped Pressure Unloader for the 51 and 60 Series Pumps, with and without check valve Features Sturdy steel and brass construction Adjustable locknut to control max pressure Easy maintenance Hexagonal...
Trapped pressure unloader with knob General Pump, along with our parent company, Interpump Group S.r.l., has been the world leader in plunger pump development since 1982. While known as the...
Trapped Pressure Unloader, Adjustable Features Sturdy steel and brass construction Adjustable locknut to control max pressure Easy maintenance Hexagonal discharge check valve to prevent jamming
Trapped Pressure Unloader, Adjustable General Pump, along with our parent company, Interpump Group S.r.l., has been the world leader in plunger pump development since 1982. While known as the leader...
Trapped Pressure Unloader, Blue Spring, with Adjustment Knob Features NEW improved design! Reduced pressure loss Makes for easier gun operation Extremely reliable Easy maintenance Includes knob fitted with locknut for...
Trapped Pressure Unloader, Blue Spring Features NEW improved design! Reduced pressure loss Makes for easier gun operation Extremely reliable Easy maintenance
Trapped Pressure Unloader, High Temperature Brass Features Suitable for use with multiple guns at the same time Dynamic seals made up of O-Rings and Teflon runner Optimized internal passages that...
Trapped Pressure Unloader, SS Inlet and Outlet Features NEW improved design! Reduced pressure loss Makes for easier gun operation Extremely reliable Easy maintenance Stainless Steel inlet and outlet
Trapped pressure unloader, white spring, with knob. Features NEW improved design! Reduced pressure loss Makes for easier gun operation Extremely reliable Easy maintenance Includes knob fitted with locknut for minimum...
Trapped Pressure Unloader, White Spring Features NEW improved design! Reduced pressure loss Makes for easier gun operation Extremely reliable Easy maintenance
Trapped Pressure Unloader, With EZ Start and Knob Features NEW improved design! Reduced pressure loss Makes for easier gun operation Extremely reliable Easy maintenance Includes knob fitted with locknut for...
Trapped Pressure Unloader, With Microswitch – 16A Resistive Load, 6A Inductive Load Features New improved design Reduced pressure loss Makes for easier gun operation Extremely reliable Easy maintenance Facilitates water...
Trapped Pressure Unloader, With Stainless Steel Check Valve Features NEW improved design! Reduced pressure loss Makes for easier gun operation Extremely reliable Easy maintenance Includes knob fitted with locknut for...
Trapped pressure unloader Features NEW improved design! Reduced pressure loss Makes for easier gun operation Extremely reliable Easy maintenance
Trapped pressure unloader Features Sturdy brass and steel construction Hexagonal shaped check valve to avoid jamming Max pressure adjustment by screw and locknut Easy maintenance
Trapped Pressure Unloader Features Sturdy brass and steel construction Multiple connections for easy installation Powerful spring action provides reliable pressure adjustment Hexagonal shaped check valve avoids jamming Knob is fitted...
Trapped pressure unloader Features Suitable for high flow rates, perfect for GP's HTCK series Dynamics seals made up of O-ring and back-up ring Optimized internal passages that guarantee reduced pressure...
Trapped Pressure Unloader Features Suitable for use with multiple guns at the same time Dynamic seals made up of O-Rings and Teflon runner Optimized internal passages that guarantee reduced pressure...
Trapped Pressure Unloader General Pump, along with our parent company, Interpump Group S.r.l., has been the world leader in plunger pump development since 1982. While known as the leader in...
Trapped Pressure Unloaders, Includes Panel Mount Feature and 5 Amp Microswitch, with and without check valve Features Extremely durable construction in stainless steel and brass Easy start-up due to low...
Trapped Pressure Unloaders, Including Microswitch Features Extremely durable unloader with microswitch Waterproof, 6 amp pressure switch
Trapped Pressure Unloaders Features Ideal for use in systems which incorporate a gasoline engine. Eliminates back pressure in system when pulling a manual start engine. Brass and stainless steel construction.
Trapped Pressure, 303 Stainless Steel - with and without check valve General Pump, along with our parent company, Interpump Group S.r.l., has been the world leader in plunger pump development...
Trapped Pressure, 303 Stainless Steel Features Sturdy 303 stainless steel and brass construction Hexagonal shaped check valve to avoid jamming Max pressure adjustment by screw and locknut Easy maintenance
Trapped Pressure, 303 Stainless Steel General Pump, along with our parent company, Interpump Group S.r.l., has been the world leader in plunger pump development since 1982. While known as the...
Trapped Pressure, Blue Spring, with and without check valve Features New improved design! Reduced pressure loss Makes for easier gun operation Extremely reliable Easy maintenance
Trapped Pressure, for the 51 and 60 Series Pumps, with and without injector Features Sturdy steel and brass construction Adjustable locknut to control max pressure Easy maintenance Hexagonal discharge check...
Trapped Pressure, Green Spring (features stainless steel outlet/bypass fittings) Features NEW improved design! Reduced pressure loss Makes for easier gun operation Extremely reliable Stainless steel inlet and outlet fittings
Trapped Pressure, Green Spring Features NEW improved design! Reduced pressure loss Makes for easier gun operation Extremely reliable Easy maintenance
Trapped Pressure, High Temperature Brass Features Suitable for use with multiple guns at the same time Designed for use up to 185º F Optimized internal passages that guarantee reduced pressure...
Trapped Pressure, White Spring Features New improved design! Reduced pressure loss Makes for easier gun operation Extremely reliable Easy maintenance
Trapped Pressure, With 5 Amp Microswitch and Stainless Steel check Valve Features Sturdy brass and steel construction Multiple connections for easy installation Powerful spring action provides reliable pressure adjustment Hexagonal...
Trapped Pressure, With Black Knob General Pump, along with our parent company, Interpump Group S.r.l., has been the world leader in plunger pump development since 1982. While known as the...
Trapped Pressure, With Microswitch – 16A Resistive Load, 6A Inductive Load and knob Features NEW improved design! Reduced pressure loss Makes for easier gun operation Extremely reliable Easy maintenance Facilitates...
Trapped Pressure, With Microswitch - 16A Resistive Load, 6A Inductive Load and Knob General Pump, along with our parent company, Interpump Group S.r.l., has been the world leader in plunger...
Trapped Pressure, With Red Knob Features Premium pressure compensated unloader for low spike pressures Adjustable max pressure settings Stainless steel internal components for maximum durability
Unloader with 2.2 mm Injector, optional banjo fittings Reduces cost - eliminates the need for fittings and bypass hose Compact design - features forged brass body and hardware Versatile -...
Unloader, manual bypass lever and automatic operation Features 3 way flow-through design pressure regulator with by-pass lever and automatic unloading Regulates operating pressure of the system by releasing excess volume...