Cylinder valve and a bayonet - return stroke filter with protection against excessive flow

摘要

A valve apparatus 840) controlling flow between a high pressure zone (42 or 43) and a low pressure zone (43 or 42), depending on whether the valve is used for discharge or filing, respectively, comprises a hollow body having a threaded handle engaging portion (19) and a main portion (20). Fluid flow between a first chamber (28 or 27) and a second chamber (27 or 28) is controlled by a stem (21) moving a seat (75) on the stem (21) into and out of contact with a nozzle (30). Rotation of handle (17) axially shifts the stem (21) without rotation thereof of move the seat (75) toward and away from engagement with nozzle (30). The stem (21) includes a seal member (57) to seal the threaded portion (19) from fluid contact with the controlled flow.