초록 ▼

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 t

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.

대표청구항 ▼

A variable gain servo controlled directional valve comprising a valve body having an elongated bore, a sleeve in said bore, a spool mounted for reciprocating movement in said sleeve, a force motor for positioning said spool in said sleeve, said valve body having an inlet pressure port and outlet pre

A variable gain servo controlled directional valve comprising a valve body having an elongated bore, a sleeve in said bore, a spool mounted for reciprocating movement in said sleeve, a force motor for positioning said spool in said sleeve, said valve body having an inlet pressure port and outlet pressure ports, said sleeve having passages permitting flow from said pressure ports to the interior of said sleeve, said spool controlling the flow through the sleeve and movable from a null position to selective positions permitting fluid flow to said outlets of said body, said sleeve including a bypass channel whereby upon shifting movement of said sleeve relative to said body, said bypass channel will permit fluid flow from said inlet port in said body to one of the outlet ports, and means operable upon movement of said force motor to selectively control movement of said sleeve and said spool, said last-mentioned means being operable upon shifting of said spool to initially permit flow under the control of said spool to one of said outlets in said body and upon continued movement of said spool to cause said sleeve to be moved axially so additional fluid will flow from said inlet port in said body to the selected outlet port of said body, and includes means for adjustably controlling the point in the axial movement of said spool when the axial movement of said sleeve is initiated.