| 摘要 |
<p>1,000,125. Valves. COMMERCIAL SHEARING & STAMPING CO. May 19, 1964 [Oct. 11, 1963], No. 20681/64. Heading F2V. A valve bank consists of an inlet section 10, two or more parallel circuit valves 11, 12 and a regenerative section 13 housing a valve 26; upon delivering pressure fluid to an inlet port 14 the fluid divides and flows along the centre and parallel passages 17, 18 of the valves 11, 12. The fluid in passage 17 passes to a tank 35 via channels 36, 34 when the valves 11, 12 are in the central position; when one of these valves is in an operating position the passage 17 is blocked but fluid continues to flow through passage 18 to a chamber 31 and moves the valve 26 against an adjustable spring 27 to interconnect two further chambers 28, 29. This enables fluid discharged from the ram or other apparatus controlled by valves 11, 12 to exhaust via passages 21, 20 of valves 11, 12 through chambers 28, 29 to the tank 35; if the ram is lowered so rapidly that the pressure in passage 18 falls, then the valve 26 is returned to the position shown by the spring 29 so forcing the fluid in passages 20, 21 into passage 18 to supplement the input fluid and prevent cavitation in the ram. A relief valve 32 is provided in valve 26.</p> |
