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By-Pass Valves

Maintain suitable water flow within compatible heating systems with our range of by-pass valves. Automatic bypass valves are commonly used in central heating systems to maintain a minimum flow rate when thermostatic radiator valves or other controls restrict the flow through heating circuits.

When choosing a central heating bypass valve, consider the system design, required flow rate, operating pressure and compatibility with the boiler and heating controls. Always check the manufacturer's specifications to ensure the valve is suitable for the intended installation.

Whether you're a heating engineer, plumber or installer completing a new installation or replacing an existing component, browse our range of by-pass valves from Thompson and Leigh.

  • Altecnic ERES 28mm Straight Automatic Bypass Valve
    SKU: 02360077
    Altecnic ERES 28mm Straight Automatic Bypass Valve
    £55.88 £46.57
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  • Altecnic ERES 28mm Angled Automatic Bypass Valve
    SKU: 02360076
    Altecnic ERES 28mm Angled Automatic Bypass Valve
    £40.69 £33.91
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  • Altecnic ERES 22mm Angled Automatic Bypass Valve
    SKU: 02360041
    Altecnic ERES 22mm Angled Automatic Bypass Valve
    £13.16 £10.97
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  • Altecnic ERES 22mm Straight Automatic Bypass Valve
    SKU: 01970012
    Altecnic ERES 22mm Straight Automatic Bypass Valve
    £16.88 £14.07
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  • Inta 28mm Straight By-Pass Valves ABPS28CP
    SKU: 03710462
    Inta 28mm Straight By-Pass Valves ABPS28CP
    £20.44 £17.03
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  • Inta 28mm Angled By-Pass Valves ABPA28CP
    SKU: 03710461
    Inta 28mm Angled By-Pass Valves ABPA28CP
    £20.44 £17.03
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  • Inta 22mm Angled By-Pass Valve
    SKU: 01970014
    Inta 22mm Angled By-Pass Valve
    £11.94 £9.95
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  • Inta 22mm Straight By-Pass Valve
    SKU: 01970013
    Inta 22mm Straight By-Pass Valve
    £16.09 £13.41
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  • DU145 22mm Auto by-Pass Valve Angled
    SKU: 01760011
    DU145 22mm Auto by-Pass Valve Angled
    £54.98 £45.82
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  • DU144 22mm Auto by-Pass Valve Straight
    SKU: 01760010
    DU144 22mm Auto by-Pass Valve Straight
    £67.43 £56.19
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