| 摘要 |
<p>1,218,246. Valves. BORG-WARNER CORP. 8 May, 1968 [5 June, 1967], No. 21863/68. Heading F2V. [Also in Division G3] A manual spool valve 10 for controlling implements on tractors, loaders, or the like, is biased to neutral by a spring 92 and has a spring detent 110 attached to the spool 70. The detent has multiple fingers 111 which snap over fixed ridges 82, 83 to locate the spool in two operated positions. In these positions, one or other of the two service ports 23, 24 is supplied from the inlet 22. Excessive pressure at the outlet port acts, through a passage 65 or 66, on an annular area 58 or 59 of a valve piston 55 or valve member 47, to open communication to a central passage 46, 51, 48. Thence the pressure, acting on a spring-loaded piston 74, moves an abutment 76 away from the spring fingers 111 to reduce their grip sufficiently to allow the spool to return to neutral under the bias of spring 92. The central passage is exhausted to return port 21 through a restriction 61.</p> |
