| 摘要 |
A tap ( 10 ) for a gas cylinder has a non-sealing gate valve ( 44 ) positioned between an on/off valve ( 14 ) and a pressure reducer ( 18 ) of the tap. The gate valve ( 44 ) is normally in a position with a normal passage area. When the valve ( 14 ) is opened the gate valve ( 44 ) is rapidly moved by the pressurized gas towards a position with a limited passage area in order to reduce the shock wave applied to the pressure reducer ( 18 ). After the pressures on both sides of the gate valve ( 44 ) have been balanced, the gate valve returns to its position with a normal passage area.
|
