A check valve, clack valve, non return valve, reflux valve, retention valve or one way valve is a . Back pressure a pressure higher at the outlet of a fitting than that at the inlet . In some ball check valves, the ball is spring loaded to help keep it shut. . A diaphragm check valve uses a flexing rubber diaphragm positioned to.
Understanding Check Valves: Sizing for the Application, Not the .
May 1, 2007 . Check valves are probably the most misunderstood valves ever invented. . such as a stem, hinge pin, disc arm, spring, ball, elastomers, and bearings. .. a valve with a damped design or dashpot to handle high frequency.