| 摘要 |
<p>A variable gain servo solenoid controlled directional valve (10) comprising a valve body (15) having an elongated bore (16), a sleeve (17) in the bore (16), a spool (18) reciprocable in the sleeve (17) and a force motor (11) for reciprocating the spool (18) and/or sleeve (17). The valve body (15) has an inlet pressure port (19) and outlet pressure ports (25, 26) to the interior of the sleeve (17). The spool (18) controls the flow through the sleeve (17) and is movable from a null position to selective positions permitting flow to the outlets (25, 26) of the body. The sleeve (17) includes a bypass channel (31) formed on the periphery thereof. Upon shifting of the spool (18) fluid flow is under the control of the spool (18) to one of the outlets (25 or 26) in the body (15). Upon continued movement of the spool (18) the sleeve (17) is moved axially so additional fluid will flow from the inlet port (26) of the body without passing through the interior of the sleeve (17).</p> |
