| 摘要 |
<p>1,122,213. Valves. BOCHUMER EISENHUTTE HEINTZMANN & CO. 20 Aug., 1965 [28 Sept., 1964], No. 35845/65. Heading F2V. [Also in Division F4] A valve which is located in a ventilation duct and adapted to close the same in the event of a pressure wave entering the duct from a detonation, is provided with an impingement plate located upstream of and coupled with the valve closure member to initiate closure of the latter before it is reached by the pressure wave. As shown, an axially movable valve member 4 is mounted on a rod 7 having an extension 9 which extends through member 4 and carries on its upstream end a dished impingement plate 10. The downstream end of rod 7 has an enlarged portion 7a slidable in a cylinder 6 which contains a spring 6a urging the valve into its open position. Valve member 4 is located in an enlarged diameter portion 1a of a ventilation duct 1 and when closed is supported on a valve seat 3a and the concave upper end of a grid 5. The valve is automatically locked in its closed position by a spring-urged finger 8a. In a modification (Fig. 4, not shown), the valve comprises a pair of semicircular flap valves (23, 23a) which have a common hinge (24) and are urged into their open position by pneumatic cylinders (27, 27a). The impingement plate (28) is mounted on a rod (29) which is slidable in a bearing (31) and has a forked end, the limbs (29a, 29b) of the fork carrying rollers which contact the flap valves. In a further modification (Fig. 3, not shown), a single flap valve is provided in a rectangular duct.</p> |
