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Check Valve vs. Non-Return Valve

I have searched the web and most sites are using these terms interchangeably. However I know that there is definitely a distinct difference. Can someone please articulate what the difference is?

Comments

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 9,007
    Non return valve are a weighted check valve usually used on high pressure steam boilers. These valves have two functions, a shut off valve when closed with the hand wheel and when opened they only allow flow in one direction only. So they are a shutoff valve and check valve combination.

    a check valve only allows flow in one direction and cannot serve as a shut off valve.

    In addition a non return valve usually take a bit more pressure to open than a check valve

    ladysteamfittervaporvacSWEI
  • ColinFarquhar
    ColinFarquhar Member Posts: 16
    Another $0.10. Non-Return Valves are also referred to as Stop & Check Valves in some areas/some manufacturers. Commonly found on steam boilers feeding a common header (more than one boiler on one header).
    Larry_52
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