| 摘要 |
955,288. Valves. A. W. WOOD. Sept. 7, 1962 [Sept. 7, 1961; June 13, 1962; June 15, 1962; July 19, 1962], Nos. 32184/61, 22682/62, 23144/62 and 27822/62. Heading F2V. [Also in Divisions F4 and G3] A safety control means comprises a valve 8, fluid pressure means 9, 10 controlling the valve, an enclosed space 11, 12 surrounding a conduit 6 to be protected and connected to the fluid pressure means, and means 19 for establishing in the enclosed space a pressure different from that in the ambient atmosphere and in the conduit 6 to open the valve, the arrangement being such that on removal of the pressure differential the valve is automatically closed. In the preferred embodiment, the valve 8 consists of a rubber diaphragm normally held off the top of a pipe 5 by reduced pressure in a cylinder 9 and which is connected by the space 11, 12 and a chamber 15 to a suction bulb 19. When the chamber 15 is tilted to a predetermined angle a member 17 either topples off the chamber or falls about a hinge to allow air to enter an inlet 16 and the valve 8 to close. The member 17 may also be caused to uncover the inlet 16 by engagement of a pin 26 with a float arm 23 if liquid rises to an excessive level in a chamber 13 containing a second float-operated valve 21 controlling the outlet of the conduit 6. The latter and an outer conduit forming the space 12 may be of polyethylene or polypropylene to allow an oil burning appliance of the radiant or convector type on which the chamber 13 is mounted to be moved about. Closure of valve 8 also occurs if either conduit is fractured or the float arm 23 is operated manually by a lever 29. The valve 8 may be loaded by a spring or be replaced by a needle valve connected by a linkage to a barometric capsule.
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