| 摘要 |
A discharge valve especially for an airgun comprises a valve member 1 guided for translatory motion and arranged to be retained by latching means 6 in a closed position wherein the valve member 1 seals an opening 10 in a passage 3 communicating between a reservoir 8 charged with gas at an elevated pressure and a discharge port 9. The arrangement is such that, in use, the valve member 1 is biased towards an open position by the pressure of gas in the charged reservoir 8, whereby upon release of the latching means 6 the valve member 1 is caused to move to an open position in which gas can pass from the charged reservoir 8 to said discharge port 9. In accordance with the invention there is provided a further reservoir 26 containing gas at an elevated pressure and arranged to act upon said valve member 1 in such a manner that, when the valve member 1 is moved to the open position the pressure of gas in said further reservoir 26 provides a restoring force returning the valve member 1 to the closed position upon a reduction of the pressure of gas in said charged reservoir 8. |
