Encyclopedia & FAQ's

DIY Frequently Asked Questions / Check Valve


  • DIY Frequently Asked Questions / Check Valve')"> Operates automatically, permitting flow in one direction only.
  • Sometimes combined with a throttling or shut-off valve. Some communities require a check valve in cold water lines between the water heater and meter.
  • Used to prevent water pumped to an overhead tank from flowing back when the pump stops.
  • Some check valves are designed for use with vertical pipes only. Therefore, it will not work if installed upside down. The closing device√≥a disk, ball or clapper√≥falls shut by gravity when installed vertically.
  • Another variety is the Swing-Type check valve, which is a small, smooth swing-type gate located in the center of the valve. As water is pumped through the flow side of the valve, a gate swings open to allow water to pass. If water attempts to back up through the valve, the gate is forced shut against the pressure side of the valve.