| 摘要 |
<p>1,134,813. Valves. ROCKWELL MFG. CO. 18 Feb., 1966 [16 March, 1965], No. 7182/66. Heading F2V. A valve comprises a fluid-pressure responsive member 30, a stem 26 connected to and movable with the member, a valve element 57 on and movable with the stem and co-operable with a valve seat 62, and a resilient sealing gasket 71 slidably mounted on the stem so as to be clamped between the element and the seat when the valve is closed. The element 57 is connected to the stem by a three-legged spider 66 and co-operates with an "O"-ring 69 while the gasket 71 may be of synthetic rubber and is clamped between rigid washers 76, 77 on a metallic or hard plastic bushing 74 freely slidable on the stem. A threaded cap 15 at the bottom of the valve body has legs 20 to receive a threaded bush 22 for guiding the stem. The stem is actuated by a spring-loaded diaphragm 30 exposed to inlet pressure through a passageway 50 in a stand-by piston 33, the passageway being closed by a ball 51 upon a sudden surge of pressure or rupture of the diaphragm.</p> |
