Tap for gas or liquid cylinder

摘要

A tap for a gas or liquid cylinder is provided that comprises an inverted seat primary valve located in a main portion of a tap body and a secondary check valve spring biased into closed position and located below the lower end of a threaded section of a root end portion of the tap body. Both valves are actuated by an elongated stem extending from the main portion of the tap body into the root end portion. When the tap is fixed to a gas or liquid cylinder, the secondary check valve is located in the cylinder, thereby remaining operative when the tap body is sheared-off at a location where it extends out from a cylinder tap aperture.