Fully compensated fluid control valve
OwnerTadeusz Budzichinventor
Life of this patent
Estimating the term…
Abstract
A direction flow control valve for control of positive and negative loads equipped with a positive and negative load compensator controlled by a single pilot valve stage responsive to positive and negative load pressure signals.
Claims30
A valve assembly supplied with pressure fluid by a pump, said valve assembly comprising a housing having a fluid inlet chamber, a fluid supply chamber, first and second load chambers, and fluid exhaust means connected to reservoir means, first valve means for selectively interconnecting said load chambers with said first supply chamber and said fluid exhaust means, first variable metering orifice means responsive to movement of said first valve means and operable to meter fluid flow between said fluid supply chamber and said load chambers, second variable metering orifice means responsive to movement of said first valve means and operable to meter fluid flow between said load chambers and said fluid exhaust means, positive load fluid throttling means between said fluid inlet chamber and said fluid supply chamber, negative load fluid throttling means between said load chambers and said fluid exhaust means, control means of said positive load and said negative load fluid throttling means having pilot amplifying valve means, said pilot amplifying valve means having first control force generating means responsive to pressure differential across said first variable metering orifice means and second control force generating means responsive to pressure differential across said second variable metering orifice means, said pilot amplifying valve means operable through control of said positive load fluid throttling means to maintain a relatively constant pressure differential across said first variable metering orifice means or through control of said negative load fluid throttling means operable to maintain a relatively constant pressure differential across said second variable metering orifice means.
A valve assembly supplied with pressure fluid by a pump, said valve assembly comprising a housing having a fluid inlet chamber, a fluid supply chamber, first and second load chambers, a fluid control chamber, and fluid exhaust means connected to reservoir means, first valve means for selectively interconnecting said load chambers with said fluid supply chamber and said fluid exhaust means, first variable metering orifice means responsive to movement of said first valve means and operable to meter fluid flow between said fluid supply chamber and said load chambers, second variable metering orifice means responsive to movement of said first valve means and operable to meter fluid flow between said load chambers and said fluid exhaust means, second valve means having positive load fluid throttling means between said fluid inlet chamber and said fluid supply chamber, negative load fluid throttling means between said load chambers and said fluid exhaust means, and force generating means responsive to pressure in said fluid control chamber, control means having pilot amplifying valve means, said pilot amplifying valve means having first control force generating means responsive to pressure differential across said first variable metering orifice means, second control force generating means responsive to pressure differential across said second variable metering orifice means, and pressure control means for controlling pressure in said fluid control chamber, said pilot amplifying valve means operable through said pressure control means by controlling pressure in said fluid control chamber to throttling fluid flow by said positive load fluid throttling means to maintain a relatively constant pressure differential across said first variable metering orifice means or to throttle fluid flow by said negative load fluid throttling means to maintain a relatively constant pressure differential across said second variable metering orifice means.
A valve assembly comprising a housing having an inlet chamber connected to a pump and an outlet chamber connected to exhaust means, first valve means operable to selectively communicate said inlet and said outlet chambers with a fluid motor, first control orifice means interposed between said inlet chamber and said fluid motor, second control orifice means interposed between said fluid motor and said outlet chamber, second valve means having positive load fluid throttling means between said inlet chamber and said pump and negative load fluid throttling means between said outlet chamber and said exhaust means, said positive and said negative load fluid throttling means controllable by a pilot valve means and operable either to throttling fluid flow by said positive load fluid throttling means to maintain a constant pressure differential across said first control orifice means or to throttle fluid flow by said negative load fluid throttling means to maintain a constant pressure differential across said second control orifice means.
A valve assembly comprising a housing having an inlet chamber connected to a pump and an outlet chamber connected to exhaust means, means operable to selectively communicate said inlet and said outlet chambers with a fluid motor, first control orifice means interposed between said inlet chamber and said fluid motor, second control orifice means interposed between said fluid motor and said exhaust means, positive load fluid throttling means between said inlet chamber and said pump, and negative load fluid throttling means between said outlet chamber and said exhaust means, said positive and said negative load fluid throttling means controllable by a fluid power amplifying and control means and operable either to throttle fluid flow by said positive load fluid throttling means to maintain a relatively constant pressure differential across said first control orifice means or to throttle fluid flow by said negative load fluid throttling means to maintain a relatively constant pressure differential across said second control orifice means.
Dependencies are inferred from the claim text.