| 摘要 |
<p>1,131,416. Valves. BORG-WARNER CORP. 8 Dec., 1965 [30 Dec., 1964], No. 52133/65. Heading F2V. A valve arrangement for providing a number of predetermined pressures, certain of which may be regulated at different values, has a first inlet leading to an annular groove 29 controlled by a first spool valve 25 and spaced from another such groove 34 which is connected to a first passage 33 that leads to a first outlet. (not shown), and to an annular groove 35 controlled by a second spool valve 26 which is spaced from another such groove 39 that leads to a recess 40 above a third spool valve 43, which recess is provided with a second outlet. The valve 43 controls a sump groove 44. The first valve 25 has a control chamber 47 open to groove 29 and communicating with a space between the end land 25a and the casing cover 16 via a passage 50 in the land. The control chamber 48 of the second valve 26 opens to groove 35 and communicates with a space between the end land 26b and a casing 19 for a pilot valve mounted on the main casing. The control chamber 49 of the third valve 43 is open to the recess 40. The first valve 25 is loaded by a pair of springs 55, 56, the effect of which is varied in dependence upon the position of a piston 57. The second and third valves are each loaded by single springs with a fixed rate. The loadings of other valves may be similarly varied. The casing 19 houses a spring-loaded pilot spool valve 72 with the inner end of the valve bore leading to exhaust and the inner face of the piston 57 via passage 71. The pilot valve 72 is actuated by fluid supplied to a second inlet through an orificed check valve 78; the pilot valve controls the fluid from a third inlet to the chambers 20 above the piston 57 by way of a further orificed check valve 82.</p> |
