| 摘要 |
<p>968,631. Valves. POWER CONTROL PRODUCTS Inc. May 18, 1962 [May 18, 1961], No. 19235/62. Heading F2V. A control valve comprises a housing 11 having a cylindrical bore 14 therein, a cylindrically shaped slide valve 16 slidable in the bore, end caps 12, 13 mounted on the housing, each end of the slide valve having a reduced diameter extension 17, 18 and each of the end caps having an inwardly projecting annular flange 19, 20, annular grooves 35, 36, 37, in the slide valve, fluid inlet and outlet passages 38 . . . 42 in the housing, fluid chambers 25, 26 in the end caps having bleeder valves 33, 34 and passage means 43 joining the chambers 25, 26. The valve connects the supply conduit 38 alternately to opposite ends of an hydraulic motor 50, exhaust from the motor being connected to one of the pair of conduits 41, 42. With the valve in the position shown, fluid from the conduit 38 flows through passages 45, 44 and 43 to act on the maximum diameter of the end 48 of the valve and on the smaller diameter of the extension 18. When the valve 33 is opened, pressure in the chamber 25 falls and the slide valve 16 is moved to the left by the fluid pressure in the chamber 26, the movement being accelerated when the extension 18 has passed through the flange 20. Opening the valve 34 causes movement of the slide valve 16 in the opposite direction. In a modification, the exhaust passages lie in a plane at right angles to that containing the supply passage which is connected to the chambers in the end caps by a passage in the body. The extensions to the slide valve may be tapered and engage tapered apertures in the end caps. For remote control the bleeder valves may be connected to the end caps by flexible tubing.</p> |
