ball-check valve

ball-check valve

A spring-operated check valve in a piping system; when the fluid flows in one direction, pressure against a movable ball allows fluid to pass; when the direction of flow is reversed, the ball is forced against a seat, thereby stopping the flow.
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References in periodicals archive ?
That means your non-return ball-check valve is leaking, or the barrel is worn so much that plastic is flowing backward over the slip ring during injection.
A bulb on the handle dispenses solvent through the hollow-center carbon rod and out to the swivel tip, locked with a ball-check valve so there's no dripping.
Instead of ball-check valves, system uses rotary flow-control valves.