Collection: Unloader & Relief 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.

  • Interpump K5 Unloader Valve K5.2
    Interpump K5 Unloader Valve K5.2
    Part No: K5.2
    • 200 Bar max pressure*
    • 16-25 Lpm flow
    • 60°C max water temperature
    • Flow sensitive valve
    • Brass & st.steel construction
    • 3/8"BSPF inlet
    • 1/2"BSPM outlet
    Regular price £66.50 GBP
    Regular price Sale price £66.50 GBP
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  • Interpump K5 Unloader Valve K5.1
    Interpump K5 Unloader Valve K5.1
    Part No: K5.1
    • 200 Bar max pressure*
    • 11-16 Lpm flow
    • 60°C max water temperature
    • Flow sensitive valve
    • Brass & st.steel construction
    • 3/8"BSPF inlet
    • 1/2"BSPM outlet
    Regular price £66.50 GBP
    Regular price Sale price £66.50 GBP
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  • Interpump K5 Unloader Valve K5.0
    Interpump K5 Unloader Valve K5.0
    Part No: K5.0
    • 200 Bar max pressure*
    • 8-11 Lpm flow
    • 60°C max water temperature
    • Flow sensitive valve
    • Brass & st.steel construction
    • 3/8"BSPF inlet
    • 1/2"BSPM outlet
    Regular price £66.50 GBP
    Regular price Sale price £66.50 GBP
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  • Interpump K3 Unloader Valve K3.2
    Interpump K3 Unloader Valve K3.2
    Part No: K3.2
    • 100 Bar max pressure*
    • 16-21 Lpm flow
    • 60°C max water temperature
    • Flow sensitive valve
    • Brass & st.steel construction
    • 3/8"BSPF inlet
    • 1/2"BSPM outlet
    Regular price £57.70 GBP
    Regular price Sale price £57.70 GBP
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  • Interpump K3 Unloader Valve K3.1
    Interpump K3 Unloader Valve K3.1
    Part No: K3.1
    • 100 Bar max pressure*
    • 11-16 Lpm flow
    • 60°C max water temperature
    • Flow sensitive valve
    • Brass & st.steel construction
    • 3/8"BSPF inlet
    • 1/2"BSPM outlet
    Regular price £57.70 GBP
    Regular price Sale price £57.70 GBP
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  • Interpump K3 Unloader Valve K3.0
    Interpump K3 Unloader Valve K3.0
    Part No: K3.0
    • 100 Bar max pressure*
    • 8-11 Lpm flow
    • 60°C max water temperature
    • Flow sensitive valve
    • Brass & st.steel construction
    • 3/8"BSPF inlet
    • 1/2"BSPM outlet
    Regular price £60.61 GBP
    Regular price Sale price £60.61 GBP
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  • Interpump K10 Unloader Valve K10.3
    Interpump K10 Unloader Valve K10.3
    Part No: K10.3
    • 600 Bar max pressure
    • 35-40 Lpm flow
    • 60°C max water temperature
    • Flow sensitive valve
    • AISI303 st.steel construction
    • 3/8"BSPF inlet
    • 3/8"BSPM outlet
    Regular price £365.14 GBP
    Regular price Sale price £365.14 GBP
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  • Interpump K10 Unloader Valve K10.2
    Interpump K10 Unloader Valve K10.2
    Part No: K10.2
    • 600 Bar max pressure
    • 27-34 Lpm flow
    • 60°C max water temperature
    • Flow sensitive valve
    • AISI303 st.steel construction
    • 3/8"BSPF inlet
    • 3/8"BSPM outlet
    Regular price £365.14 GBP
    Regular price Sale price £365.14 GBP
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  • Interpump K10 Unloader Valve K10.1
    Interpump K10 Unloader Valve K10.1
    Part No: K10.1
    • 600 Bar max pressure
    • 19-26 Lpm flow
    • 60°C max water temperature
    • Flow sensitive valve
    • AISI303 st.steel construction
    • 3/8"BSPF inlet
    • 3/8"BSPM outlet
    Regular price £365.14 GBP
    Regular price Sale price £365.14 GBP
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  • Interpump K10 Unloader Valve K10.0
    Interpump K10 Unloader Valve K10.0
    Part No: K10.0
    • 600 Bar max pressure
    • 12-18 Lpm flow
    • 60°C max water temperature
    • Flow sensitive valve
    • AISI303 st.steel construction
    • 3/8"BSPF inlet
    • 3/8"BSPM outlet
    Regular price £570,000.00 GBP
    Regular price Sale price £570,000.00 GBP
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  • Interpump K1 Unloader Valve
    Interpump K1 Unloader Valve
    Part No: K1
    • 250 Bar max pressure*
    • 9-41 Lpm flow
    • 60°C max water temperature
    • Flow sensitive valve
    • Brass & st.steel construction
    • 3/8"BSPF inlet
    • 1/2"BSPM outlet
    Regular price £66.50 GBP
    Regular price Sale price £66.50 GBP
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  • Interpump HXM Regulator Valve
    Interpump HXM Regulator Valve
    Part No: HXM
    • 130 Bar max pressure
    • 15 Lpm max flow
    • 60°C max water temperature
    • Brass construction
    • For use with IP FE series pumps
    • Misting specific valve
    • 3/8"BSPM inlet
    Regular price £40.84 GBP
    Regular price Sale price £40.84 GBP
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  • Interpump HX Unloader Valve
    Interpump HX Unloader Valve
    Part No: HX
    • 130 Bar max pressure
    • 5-15 Lpm flow
    • 60°C max water temperature
    • Trapped pressure valve
    • Brass construction
    • 3/8"BSPM inlet
    • 3/8"BSPM outlet
    Regular price £41.98 GBP
    Regular price Sale price £41.98 GBP
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  • Interpump HM1 Unloader Valve
    Interpump HM1 Unloader Valve
    Part No: HM1
    • 200 Bar max pressure
    • 5-41 Lpm flow
    • 85°C max water temperature
    • Trapped pressure valve
    • Brass construction
    • 3/8"BSPF inlet
    • 3/8"BSPM outlet
    Regular price £66.36 GBP
    Regular price Sale price £66.36 GBP
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  • Interpump H450 Unloader Valve
    Interpump H450 Unloader Valve
    Part No: H450
    • 400 Bar max pressure
    • 8-50 Lpm max flow
    • 85°C max water temperature
    • Trapped pressure valve
    • Brass construction
    • 1/2"BSPF inlet
    • 1/2"BSPM outlet
    Regular price £271.58 GBP
    Regular price Sale price £271.58 GBP
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  • Pratissoli H2820 Unloader Valve
    Pratissoli H2820 Unloader Valve
    Part No: H2820
    • 280 Bar max pressure
    • 20-200 Lpm flow
    • 85°C max water temperature
    • Trapped pressure valve
    • Brass body
    • 1"BSPF inlet
    • 1"BSPF outlet
    Regular price £497.01 GBP
    Regular price Sale price £497.01 GBP
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  • Interpump H253 Unloader Valve - AISI 316 H253SS
    Interpump H253 Unloader Valve - AISI 316 H253SS
    Part No: H253SS
    • 250 Bar max pressure
    • 8-30 Lpm flow
    • 60°C max water temperature
    • Trapped pressure valve
    • AISI 316 stainless steel body and internals*
    • *AISI 420 ball, 17.4-PH s/steel valve shaft
    • 3/8"BSPF inlet
    Regular price £339.78 GBP
    Regular price Sale price £339.78 GBP
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  • Pratissoli H1520 Unloader Valve
    Pratissoli H1520 Unloader Valve
    Part No: H1520
    • 150 Bar max pressure
    • 20-200 Lpm flow
    • 85°C max water temperature
    • Trapped pressure valve
    • Brass construction
    • 1"BSPF inlet
    • 1"BSPF outlet
    Regular price £242.49 GBP
    Regular price Sale price £242.49 GBP
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  • ES1 Easy Start Valve
    ES1 Easy Start Valve
    Part No: EASYSTART
    • Eases the start of engine driven plunger pumps
    • Brass body
    • Stainless steel seat & ball
    • 280 bar rated pressure
    • 30 Lpm max flow
    • 80°C rated temperature
    • 8mm hose barb outlet
    Regular price £16.32 GBP
    Regular price Sale price £16.32 GBP
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