| 摘要 |
<p>969,365. Valves. VAREC Inc. Feb. 14, 1962 [Nov. 30, 1961], No. 5626/62. Heading F2V. A valve structure comprises a lift member or disc 24 which extends radially outwardly at 24B from a valve seat 14A and is provided with an annular diaphragm part 23B having its periphery slidably located in a groove in the part 24B, the diaphragm 23B inwardly of the seat being loosely supported by an apertured support 26 carried from the disc 24, the fluid pressure within the seat opening thus having access behind the diaphragm so that portions A and B bridging the spaces between the part 24B and the seat and between the seat and the support 26 are bowed away from the disc 24 by the fluid pressure as the valve is opened thereby, and the diaphragm adheres to the seat until the disc is lifted well clear of the seat. The diaphragm part 23B is sealed at its periphery to a second diaphragm part 23A covering the face of the disc 24. The structure is incorporated in a combined pressure and vacuum relief valve, wherein the pressure valve 18 and the vacuum valve 17 are gravity loaded. The outlet of the pressure valve is provided with a filter 33 supported by pillars 30 which also support an annular baffle 35 to which is hinged a cover 39 releasably secured to the baffle by arms 55 engaged by spring held eyes 38. The cover 39 carries an internal bifurcated arm 46 rotatably through a shaft 45 by an external counterweighted arm 48 whereby to engage and hold the valve 18 closed when required. The inlet of the vacuum valve 17 also has a filter 67, and a cover 16 of the casing in line with this valve is secured by a strap 62 secured to the cover and releasably held by screwed hand wheels 65.</p> |
