| 摘要 |
<p>1530060 Valves SHOKETSU KINZOKU KOGYO KK 5 Sept 1977 [8 Sept 1976] 37024/77 Heading F2V A solenoid pilot valve 16, 18 with respective drain and pilot seats 20, 13, having a diameter ratio of at least 1À4 : 1 the pilot is opened and the drain closed by energizing the solenoid against resilience 19 and thus admitting pressurized fluid from an input port 2 of a spool valve, via an axial bore 14 in a spool 8 and a piston 11 to a chamber 12, to act on the piston and move the spool leftward of the position shown, against a return spring 15. By the provision of an enlarged drain port diameter, depressurization of chamber 12 is effected on de-energization of the solenoid without the requirement of closing the pilot seat 13. Spring 19 may therefore be shorter and the spring and solenoid weaker than in prior similar valves with equal diameters of pilot and drain ports.</p> |
