| 摘要 |
<p>1287451 Dual-circuit valves ROBERT BOSCH GmbH 17 Sept 1969 [19 Sept 1968] 45716/69 Heading F2V Actuation of the push-rod 40 seats the closure 38 on the end 39 of the tubular closure member 34 to close the exhaust passage 26 and thereafter moves the closure member 34 off the seat 24 to connect the outlet 46 to a compressed air inlet 44. The outlet pressure acts on diaphragm 9 to seat a closure 8 on the end 41 of the closure member 33 to close the exhaust passage 25 and to thereafter move closure member 33 off the seat 23 to connect outlet 45 to compressed air inlet 43. Failure of pressure in inlet 44 causes the end 35 of the member 34 to contact the diaphragm 9 and mechanically actuate the closure members 8, 33, the area A on which reaction pressure normally acts on the pushrod being equal to the difference in area D-E on which the reaction pressure acts on pressure failure.</p> |
