| 摘要 |
<p>1,057,768. Valves. PARKER-HANNIFIN CORPORATION. Aug. 7, 1964 [Aug. 7, 1963], No. 32271/64. Heading F2V. Two pilot-actuated main-valves 56 which control the operation of a double-acting motor are disposed in a housing made up of a reinforced, partitioned and cored die-cast distributing- block 2 which has a cover 3 that supports a solenoid-operated pilot-valve block 4; the block 2 and cover 3 accommodate a plug 40 and socket 41 whereby electric current is taken to 'the solenoid 43. The valves 56 are each formed as a cartridge 36, the latter being joined by a plate 53 which angularly locates them in the block 2 and facilitates their removal. Each valve 56 co-operates with seats 57, 58 and incorporates a depending guide and an upstanding piston 60 in a chamber 71. With the solenoid de-energized a spring 67 urges the armature 68 on to a seat 69, so opening a seat 48 and enabling fluid from an inlet chamber 15 to chamber 71 via a check valve 31, a chamber 32 and passages 46, 47, 66 and 65, whereupon the pistons 60 are lowered to close valves 56 upon seats 57. Fluid from chamber 15 is thereby permitted to traverse a passage 17 and right-hand seat 58 to a motor chamber 24; the motor exhaust fluid enters a chamber 23 and flows to an exhaust chamber 20 via lefthand seat 58 and a passage 22. The motor is moved in the opposite direction upon energizing the solenoid 43 to close seat 48 and open seat 69. The check valve 31 traps sufficient fluid in chamber 32 for one downward actuation of the valves in the event of a loss of pressure in chamber 15. Each valve 56 may have its own pilot valve. In a modification, the pilot valve directly controls the right-hand valve 56 only, the latter in turn controlling the supply of fluid to the left-hand piston 60.</p> |
