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    Bypass
    Bypass

    Bypass

    Differential bypass valve is designed to prevent the pump from working against a closed circuit when all the 2 port control valves or thermostatic radiator valves have closed. It reduces flow noise as thermostatic radiator valves are closed. Fitted between the flow and return pipework, it also helps to prevent unnecessary cycling of the boiler.Suitable for radiator, heating and chilled water circuits.

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    Automatic By-Pass Differential Valve - 22mm Angled Caleffi Automatic By-Pass Differential Valve - 22mm Angled Caleffi Automatic By-Pass Differential Valve - 22mm Angled
    Caleffi Automatic By-Pass Differential Valve - 22mm Angled Part Number: 12161
    £67.91 £56.59
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    Automatic By-Pass Differential Valve - 22mm Straight Automatic By-Pass Differential Valve - 22mm Straight Automatic By-Pass Differential Valve - 22mm Straight
    Automatic By-Pass Differential Valve - 22mm Straight Part Number: 19570
    £11.35 £9.46
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    Honeywell Home DU144 Auto By-Pass Valve - 22mm Straight Honeywell Home DU144 Auto By-Pass Valve - 22mm Straight Honeywell Home DU144 Auto By-Pass Valve - 22mm Straight
    Honeywell Home DU144 Auto By-Pass Valve - 22mm Straight Part Number: 18863
    £74.54 £62.12
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    Honeywell Home DU145 Auto By-Pass Valve - 22mm Angled Honeywell Home DU145 Auto By-Pass Valve - 22mm Angled Honeywell Home DU145 Auto By-Pass Valve - 22mm Angled
    Honeywell Home DU145 Auto By-Pass Valve - 22mm Angled Part Number: 18864
    £74.54 £62.12
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    Automatic By-Pass Differential Valve - 22mm Angled Automatic By-Pass Differential Valve - 22mm Angled Automatic By-Pass Differential Valve - 22mm Angled
    Automatic By-Pass Differential Valve - 22mm Angled Part Number: 17884
    £14.64 £12.20
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    Automatic By-Pass Differential Valve - 22mm Angled Automatic By-Pass Differential Valve - 22mm Angled Automatic By-Pass Differential Valve - 22mm Angled
    Automatic By-Pass Differential Valve - 22mm Angled Part Number: 21382
    Was £7.34 £6.12 Now £6.23 £5.19

    Save £1.12 £0.93 (15%)

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    Automatic By-Pass Differential Valve - 22mm Straight Automatic By-Pass Differential Valve - 22mm Straight Automatic By-Pass Differential Valve - 22mm Straight
    Automatic By-Pass Differential Valve - 22mm Straight Part Number: 21383
    £10.30 £8.58
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    Honeywell Home Commercial Auto By-Pass Valve - 3/4" Angled Honeywell Home Commercial Auto By-Pass Valve - 3/4" Angled Honeywell Home Commercial Auto By-Pass Valve - 3/4" Angled
    Honeywell Home Commercial Auto By-Pass Valve - 3/4" Angled Part Number: 18865
    £112.78 £93.98
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