| 摘要 |
<p>A variable gain servo solenoid controlled directional valve comprising a valve body having an elongated bore, a sleeve in the bore, a spool reciprocable in the sleeve and a force motor for reciprocating the spool and/or sleeve. The valve body has an inlet pressure port and outlet pressure ports to the interior of the sleeve. The spool controls the flow through the sleeve and is movable from a null position to selective positions permitting flow to the outlets of the body. The sleeve includes a bypass channel formed on the periphery thereof. Upon shifting of the spool fluid flow is under the control of the spool to one of the outlets in the body. Upon continued movement of the spool the sleeve is moved axially so additional fluid will flow from the inlet port in the body through the bypass channel to the selected output port of the body without passing through the interior of the sleeve.</p> |
