Fluid discharge valve

摘要

A valve which allows the rapid discharge of a fluid from a reservoir (13) to a working volume (12) includes a housing (10) and a cylindrical sleeve (14) movable axially within the housing between a closed position in which it separates the reservoir (13) from the working volume (12) and an open position in which the reservoir (13) communicates with the working volume (12). Actuating means are provided for moving the sleeve (14) between its two positions. Seals (20, 21) are located to engage one end (19) of the sleeve around the outer and inner peripheries respectively when the sleeve (14) is in the closed position. One seal (20) is forced into engagement with the sleeve (14) by the pressure of fluid in the reservoir (13) and the other seal (21) is forced into engagement with the sleeve (14) only when fluid pressure is applied by the actuating means to move the sleeve (14) from its closed position to its open position. The valve can be used to operate a compressed air projectile launcher.