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Non-return Valves

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7 Items

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  1. McAlpine 1 1/4" In-Line Non-Return Valve
    McAlpine 1 1/4" In-Line Non-Return Valve
    £15.84
    Delivery Time: 1-2 Days
  2. McAlpine 1 1/4" In-Line Non-Return Valve with Plain Tail
    McAlpine 1 1/4" In-Line Non-Return Valve with Plain Tail
    £14.50
    Delivery Time: 1-2 Days
  3. McAlpine 2" Multifit In-Line Non-Return Valve
    McAlpine 2" Multifit In-Line Non-Return Valve
    £18.34
    Delivery Time: 1-2 Days
  4. McAlpine 2" Solvent Weld In-Line Non-Return Valve
    McAlpine 2" Solvent Weld In-Line Non-Return Valve
    £16.73
    Delivery Time: 1-2 Days
  5. McAlpine In-Line Non Return Valve (Wasteflow) - 3/4"
    McAlpine In-Line Non Return Valve (Wasteflow) - 3/4"
    £1.85
    Delivery Time: 1-2 Days
  6. McAlpine In-Line Vertical Non-Return Valve
    McAlpine In-Line Vertical Non-Return Valve
    £12.83
    Delivery Time: 1-2 Days
  7. McAlpine Multifit In-Line Non-Return Valve
    More Options Available
    McAlpine Multifit In-Line Non-Return Valve
    From £13.79
    Delivery Time: 3-5 Days
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Non-return valves are designed with two openings in the body – one for the media to enter and the other for it to exit. They provide installers with an affordable and easy method of preventing backward flow of liquid or gas. 

The main function of a non-return valve (NRV) is to permit the movement of liquid/gas in one direction whilst automatically preventing backflow. Non-return valves are flow sensitive, which means they rely on the flow of the media to open and close. The internal disc opens to allow the flow through the valve, but the disc will then start to close as the forward flow decreases or is reversed.