| 摘要 |
1,147,234. Valves. BRYAN DONKIN CO. Ltd. 10 July, 1967 [19 July, 1966], No. 32346/66. Heading F2V. A safety cut-off valve has a horse shoe permanent magnet 40 which energizes two soft iron polepieces 58 adapted to attract a keeper 64 and hold lever 19 horizontal to latch the closure member 16 open. When a preset pressure is reached a pressure sensitive diaphragm 34 connected to magnet 40 moves the latter on to a second keeper 62 away from polepieces 58 so that the first keeper 64 falls pivoting lever 19 about point 20 to release the closure member 16 which is urged on to its seat 18 by a spring 28. To reset the valve a spindle 17 passing through the valve casing is depressed against a spring, to bring a hexagonal part of the spindle into a hexagonal aperture coaxial with the pivot axis of lever 26, and rotated to return the closure member 16 behind the latch 22. If the valve is closed in store projection 27 returns the lever 19 to its horizontal position to complete the magnetic circuit. The outlet may be controlled by a pressure regulator valve, Fig. 6 (not shown), having a closure member (116) actuated by a diaphragm and lever mechanism. |
