| 摘要 |
<p>1290140 Valves PRESSURE NEUTRALIZED VALVES (PTY) Ltd 24 March 1970 [3 April 1969] 14099/70 Heading F2V Valve comprises a casing having an inlet 12 and outlet 14, and a movable part 24 having a fluid passage 26 which is divided to present two ports 28. These ports are obturated by two closure elements 56, 56À1 mounted on a stationary carrier 20. One of the elements is fixed to the carrier and the other has limited freedom for axial movement thereon, so that movement of the part 24 causes one closure to open before the other, so reducing the initial force required for opening the valve. As shown, the valve is operated by a screw threaded handle 72, Fig. 1. The valve of Fig. 3 constitutes a regulating valve responsive to outlet pressure acting on a piston (88), Fig. 4 (not shown). In another embodiment the valve is operated by a float.</p> |
