| 摘要 |
A gas cylinder valve comprises a valve body (10) having a valve chamber (30), an inlet passage (28) and an outlet passage (34) therein. An obturating body (38) is movable relative to a valve seat (40) in the valve body. A valve stem (48) is connected to the obturating body for moving the latter between a closed position, wherein the obturating body sits on the valve seat so as to seal gas discharge through the valve seat, and an open position, wherein the obturating body is spaced from the valve seat so as to allow gas discharge from the gas cylinder through the valve seat. A first diaphragm member (50) forms a flexible wall of the valve chamber. It is mechanically connected to the valve stem, so that a reciprocating movement of the valve stem elastically deforms the first diaphragm member. The inlet passage is in direct pressure communication with the valve chamber, so that the valve chamber is under gas cylinder pressure when the valve is closed. The valve seat is located between the valve chamber and the outlet passage. The obturating body is arranged in the direction of the discharged gas downstream of the valve seat, so that the gas cylinder pressure in the valve chamber acting on the first diaphragm member tends to pull the obturating body onto its valve seat. |
