Unloader & Relief Valves

Our Unloader & Relief Valves products help control pressure and bypass flow in compatible pressure washer systems.

Browse our Unloader & Relief Valves range below with fast UK delivery available.

Controlsets
Controlsets
Trapped Pressure Unloader Valves
Trapped Pressure Unloader Valves
Flow Sensitive Unloader Valves
Flow Sensitive Unloader Valves
Pressure Regulating Valves
Pressure Regulating Valves
Safety Relief Valves
Safety Relief Valves
Foot Operated On/Off & Bypass Valves
Foot Operated On/Off & Bypass Valves
Pneumatic On/Off & Distributor Valves
Pneumatic On/Off & Distributor Valves
Pneumatic Unloader Valves
Pneumatic Unloader Valves
Pneumatic Pressure Regulating Valves
Pneumatic Pressure Regulating Valves
Pump Thermal Protectors
Pump Thermal Protectors
Easy Start Valves
Easy Start Valves

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Pressure Washing Supplies UK is a UK supplier of pressure washing equipment, pumps, hose reels, hoses, valves, fittings and replacement parts for professional, agricultural and industrial use.

  • Pratissoli SV12 Safety Relief Valve
    Pratissoli SV12 Safety Relief Valve
    Part No: SV12
    • 640-1800 Bar pressure
    • 12-100 Lpm flow
    • 30°C max water temperature
    • Stainless steel construction
    • Factory set & sealed to order
    • 1/2"BSPM inlet
    • Call sales office for installation advice
    £312.50 GBP
    £312.50 GBP
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  • 555 Pressure Regulator - AISI 316
    555 Pressure Regulator - AISI 316
    Part No: SST555-172
    • 172 Bar max pressure
    • 26 Lpm max flow
    • 82°C rated water temperature
    • Mount off line on a tee
    • AISI 316L stainless steel
    • BUNA seals
    • Not preset
    £200.76 GBP
    £200.76 GBP
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  • 555 Pressure Regulator - AISI 316
    555 Pressure Regulator - AISI 316
    Part No: SST555-137
    • 137 Bar max pressure
    • 26 Lpm max flow
    • 82°C rated water temperature
    • Mount off line on a tee
    • AISI 316L stainless steel
    • BUNA seals
    • Not preset
    £200.76 GBP
    £200.76 GBP
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  • Pratissoli S4090 Certified Safety Relief Valve
    Pratissoli S4090 Certified Safety Relief Valve
    Part No: S4090-400
    • 400 Bar max working pressure
    • 480 Bar set pressure
    • 150-451 Lpm flow
    • 85°C max water temperature
    • Factory set & sealed to order
    • PED certified to 97/23/CE cat. II
    • Stainless steel construction
    £2,129.26 GBP
    £2,129.26 GBP
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  • Pratissoli S4090 Certified Safety Relief Valve
    Pratissoli S4090 Certified Safety Relief Valve
    Part No: S4090-350
    • 350 Bar max working pressure
    • 420 Bar set pressure
    • 150-516 Lpm flow
    • 85°C max water temperature
    • Factory set & sealed to order
    • PED certified to 97/23/CE cat. II
    • Stainless steel construction
    £2,129.26 GBP
    £2,129.26 GBP
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  • Pratissoli S4090 Certified Safety Relief Valve
    Pratissoli S4090 Certified Safety Relief Valve
    Part No: S4090-320
    • 320 Bar max working pressure
    • 384 Bar set pressure
    • 150-564 Lpm flow
    • 85°C max water temperature
    • Factory set & sealed to order
    • PED certified to 97/23/CE cat. II
    • Stainless steel construction
    £2,129.26 GBP
    £2,129.26 GBP
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  • Pratissoli S4090 Certified Safety Relief Valve
    Pratissoli S4090 Certified Safety Relief Valve
    Part No: S4090-150
    • 150 Bar max working pressure
    • 180 Bar set pressure
    • 150-950 Lpm flow
    • 85°C max water temperature
    • Factory set & sealed to order
    • PED certified to 97/23/CE cat. II
    • Stainless steel construction
    £2,129.26 GBP
    £2,129.26 GBP
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  • Pratissoli S4090 Certified Safety Relief Valve
    Pratissoli S4090 Certified Safety Relief Valve
    Part No: S4090
    • 70-400 Bar pressure
    • 150-950 Lpm flow*
    • 85°C max water temperature
    • Factory set & sealed to order*
    • PED certified to 97/23/CE cat. II
    • Stainless steel construction
    • 1"1/2BSPM inlet
    £2,129.26 GBP
    £2,129.26 GBP
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  • Interpump S3 Safety Relief Valve
    Interpump S3 Safety Relief Valve
    Part No: S3
    • 60-700 Bar pressure
    • 10-100 Lpm flow*
    • 60°C max water temperature
    • Brass body - St.steel internals
    • Not preset, see manual
    • 1/2"BSPM inlet
    £203.98 GBP
    £203.98 GBP
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  • Interpump S284 Safety Relief Valve
    Interpump S284 Safety Relief Valve
    Part No: S284
    • 50-300 Bar pressure*
    • 7-41 Lpm flow
    • 85°C max water temperature
    • Brass construction
    • Not preset, see manual
    • 3/8" male inlet
    • 10mm hose barb discharge
    £30.81 GBP
    £30.81 GBP
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