| 摘要 |
A valve has a body 2 having four inlets 3 for fluid to be controlled at one, planar end 4. Centrally of inlets 3 is a control fluid inlet 6. A shuttle chamber 8 extends away from the inlet 6, with drillings 9, extending from the inlets 3, arranged radially of the shuttle chamber. Shuttle chamber 8 has an opening 10 at an outlet end 11 of the body, where an outlet end plate 12 is bolted on, to which a spray nozzle 14 is fitted. End 41 of stem 31 of a shuttle 21 has a recess 42 for a closure elastomer block 43. This co-operates with end 44 of nozzle 14, to close the nozzle when control pressure is applied behind a piston 30 of the shuttle via inlet 6. Release of the control pressure allows the spring 37 to move the piston back, whereupon the pressure of the fluid being controlled acts on the block, adding to the spring force, and the valve snaps open. Plate 12 can be removed from the body to allow removal of the shuttle 21 for maintenance. |
