A pressure-regulating valve includes a valve sleeve with first and second ends defining a longitudinal axis, a sense line, a sense piston, a main chamber, and first and second valve spools. The sleeve includes an axially aligned bore. The sense line is within the bore proximate the first end. The sense piston is within the bore between the sense line and the second end, and is configured to move along the longitudinal axis in response to pressure exerted by fluid in the sense line. The main chamber is within the bore between the sense piston and the second end, and includes supply and vent ports. The first valve spool is within the bore between the sense piston and the second end. The second valve spool is within the bore between the first valve spool and the second end.

Devices and systems for exchanging properties between at least two fluid streams and related methods may include a valve device comprising a valve actuator configured to move at variable rates in order to selectively fill and empty at least one tank. Devices for exchanging properties between at least two fluid streams may include a valve device comprising staggered and overlapping openings positioned along a path of a valve actuator. The staggered and overlapping openings may be configured to selectively and gradually place an inlet in communication with at least one tank.

The device includes a main valve, first and second auxiliary valves, a valve body and a filter. The main, which has first and second auxiliary valves are mounted on the valve body, which has an air inlet, a cylinder port and an air discharging port. The air inlet is in communication with the main valve through a first air passage, the cylinder port is sequentially in communication with the first and second auxiliary valves, and the main valve through a second air passage. The air discharging port is sequentially in communication with the first and second auxiliary valves and the main valve through a third air passage. The main and the second auxiliary valves are solenoid valves, and the first auxiliary valve is a hand-operated valve. An air outlet of the filter is in communication with the air inlet. The filter is used for filtering out impurities in gas.

A non-plugging, multi-stage valve trim and a fluid flow control device employing the same. The valve trim includes a unitary cage body extending along a longitudinal axis, and a valve plug movably disposed within the unitary cage body to control fluid flow through the unitary cage body. The unitary cage body includes an outer wall arranged to engage the valve body, an inner wall spaced radially inwardly of the outer wall, a cage inlet formed in the outer wall, a cage outlet formed in the outer wall, and a pressure reducing fluid flow passageway formed within the unitary cage body and extending between the cage inlet and the cage outlet.

Devices and systems for exchanging properties between at least two fluid streams and related methods may include a valve device comprising a valve actuator configured to move at variable rates in order to selectively fill and empty at least one tank. Devices for exchanging properties between at least two fluid streams may include a valve device comprising staggered and overlapping openings positioned along a path of a valve actuator. The staggered and overlapping openings may be configured to selectively and gradually place an inlet in communication with at least one tank.

A solenoid-operated valve assembly that reduces the jet flow of fluid or gas in an axially exiting valve. The valve assembly comprises a spool valve, a valve member housing, and a flow path. The spool valve comprises a fluid communication channel, a tail, and an inlet seat. The valve member housing comprises at least one inlet, at least one nozzle flow director, and at least one outlet. The flow path begins at the at least one inlet and exits at the at least one outlet. The at least one nozzle flow director is within the flow path. The spool valve moves axially within the valve member housing between a closed position and an open position. The inlet seat closes the at least one flow path at the inlet when the spool valve is in the closed position. A method of operation of the solenoid-operated valve assembly is also provided.

A non-plugging, multi-stage valve trim and a fluid flow control device employing the same. The valve trim includes a unitary cage body extending along a longitudinal axis, and a valve plug movably disposed within the unitary cage body to control fluid flow through the unitary cage body. The unitary cage body includes an outer wall arranged to engage the valve body, an inner wall spaced radially inwardly of the outer wall, a cage inlet formed in the outer wall, a cage outlet formed in the outer wall, and a pressure reducing fluid flow passageway formed within the unitary cage body and extending between the cage inlet and the cage outlet.

A pressure relief valve for a fluid power assist steering system. The valve includes a housing and a spool disposed in the housing. The spool defines a cavity and has a first end and a second end. The spool is movable in the housing to limit an output pressure of the pump. A poppet seat is secured to the second end of the spool. A poppet is disposed in the cavity. A poppet spring biases the poppet into engagement with the poppet seat. A set screw is received in the first end of the spool. The set screw is rotatable relative to the spool to adjust a compression level of the poppet spring.

A pressure relief valve for a fluid power assist steering system. The valve includes a housing and a spool disposed in the housing. The spool defines a cavity and has a first end and a second end. The spool is movable in the housing to limit an output pressure of the pump. A poppet seat is secured to the second end of the spool. A poppet is disposed in the cavity. A poppet spring biases the poppet into engagement with the poppet seat. A set screw is received in the first end of the spool. The set screw is rotatable relative to the spool to adjust a compression level of the poppet spring.

A spool for a hydraulic valve includes a cylindrical body having a first end, a second end disposed opposite the first end, and an annular wall defined by an internal surface of the cylindrical body and an external surface of the cylindrical body. The annular wall defines a plurality of holes therethrough. The internal surface defines a first chamber, a second chamber, and a slot chamber within the cylindrical body, the second chamber being in fluid communication with the plurality of holes via the first chamber, the slot chamber being located between the second chamber and the second end of the cylindrical body. The annular wall defines a slot therethrough, the slot extending from the second end of the cylindrical body toward the first end of the cylindrical body along the longitudinal direction, the slot being open at the second end of the cylindrical body along the longitudinal direction.