| 摘要 |
<p>1390660 Valves AUTOMATIC SWITCH CO 16 Nov 1972 [10 Dec 1971] 52952/72 Heading F2V A valve includes a valve member which, under the action of pressure from a fluid supply, prevents supply fluid from passing from the inlet port to an outlet port unless the valve member is unseated by the presence of a control pressure at a control port. The control pressure applied to port 14, Fig. 2, is the output of a fluid logic circuit in the embodiment described, and is low relative to the supply pressure applied to port 17. In the absence of pressure at port 14 valve member 41 has the position shown, preventing supply fluid from passing to outlet port 18. Outlet port 18 is connected to exhaust port 24. When there is control pressure at port 14 diaphragm 32 moves downwards. Shaft 39 then blocks exhaust port 24 and, valve member 41 being unseated, supply fluid passes from port 17 to port 18.</p> |
