A Control unit of a hydraulic unit comprises a control piston slidable arranged in a control cylinder to provide a hydraulic fluid under servo pressure at a first outlet of the control unit suitable for the displacement of the hydraulic unit. The servo pressure is proportional to a sum of the inner forces of the hydraulic unit and the operational forces act on the control unit. The hydraulic fluid provided at the outlet is fed by a charge pressure supply at charge pressure at an inlet of the control unit. The control piston has a blind bore in the direction of a longitudinal axis of the control unit, in which a pressure relief valve is arranged functioning as a pilot-control unit having a two-sided pressure relief piston arranged in the blind bore and slidable relative to the control piston by means of an actuator.

A proportional pressure regulating valve has a valve piston (12) longitudinally movable in a valve housing (10) and connecting a utility connection (A) to a pressure supply connection (P) or to a tank or return flow connection (T) dependent on the displacement position of the valve piston. The valve piston is actuated by an actuation magnet (48) that can be supplied with current. A control device (50) is between the valve piston (12) and the actuation magnet (48), and allows the valve piston (12) to become pressureless on the valve piston side (52) facing the actuation magnet (48). The valve piston (12) is displaced in the direction of the actuation magnet (48) under the supply and/or utility connection pressure when the actuation magnet is not actuated.

A valve arrangement includes various improvements usable in the context of a fluid additive system, such as a water softener. For example, the valve assembly may include a seal assembly engaged by a reciprocating piston, in which the seal assembly includes a minimal number of parts, is easily assembled, and can be easily inserted in the bore of the valve body without jeopardizing the integrity of the seals. The valve assembly may further include a quick-disconnect system which allows a control head including a valve actuation system and electronic controls to be disconnected from the rest of the valve arrangement with only a partial rotation of the control head. The valve assembly may also include a venturi used for drawing regeneration fluid into the system, and an associated venturi cleaner system which allows a user to unclog the fluid-flow orifice of the venturi without any disassembly of parts of the valve arrangement.

A valve for a turbomachine, has a valve cone and a valve seat, the valve cone being configured such that it can be moved in a valve body with respect to the valve seat. The opening and closing of the valve being achieved by the use of process-internal media taking into account different geometries of the working chambers and the use of thermodynamically different state variables.

A valve arrangement includes various improvements useable in the context of a fluid additive system, such as a water softener. For example, the valve assembly may include a seal assembly engaged by a reciprocating piston, in which the seal assembly includes a minimal number of parts, is easily assembled, and can be easily inserted in the bore of the valve body without jeopardizing the integrity of the seals. The valve assembly may further include a quick-disconnect system which allows a control head including a valve actuation system and electronic controls to be disconnected from the rest of the valve arrangement with only a partial rotation of the control head. The valve assembly may also include a venturi used for drawing regeneration fluid into the system, and an associated venturi cleaner system which allows a user to unclog the fluid-flow orifice of the venturi without any disassembly of parts of the valve arrangement.

A valve, which has at least one seal ring arranged in a recess of a valve housing, which seal ring has a seal housing having a U-shaped cross-section, in which seal housing an annular sealing element is arranged. The seal housing has a multi-part design and contains at least one separate housing leg, which is fixed to an annular bottom section of the seal housing in a joining region. The sealing element has a static sealing section, which engages in a sealing groove formed in the bottom section and is suitable for interacting with the two groove flanks of the sealing groove in a sealing manner.

A pre-tensioning-pre-twisting full-bridge 2D electro-hydraulic proportional directional valve can include a 2D valve, linear electro-mechanical converters at two ends of the 2D valve, and a compression-torsion coupling between the linear electro-mechanical converters. The 2D valve can include a valve core and a valve body, wherein the valve core is rotatably and axially slidably disposed inside an inner hole that is set along the axis line of the valve body. Each end shoulder of the valve core is provided with a pair of high pressure holes and low pressure holes, which are respectively communicated with a P opening and a T opening through an inner hole of the valve core.

The invention relates to a valve, in particular a proportional pressure regulating valve, comprising a valve piston (12) which is longitudinally movable in a valve housing (10) for alternately releasing and connecting a user connection (A) to a pressure supply port (P) or a tank connection (T), which can be actuated by means of an actuating magnet (14) and which produces a dither signal during operation, characterized in that the valve piston (12) reaches a floating position within the valve housing (10) by means of a hydraulic lift limitation for the receipt of the dither signal.

Embodiments of the invention provide a control valve assembly that includes a piston slidably seated within a valve chamber and moveable between multiple positions to adjust a flow rate of fluid through the control valve assembly. The piston comprises flow zones and seal surfaces to define variable flow rates related to the position of the piston within the valve chamber and to selectively seal with the valve chamber.

Hydraulic devices used to control timing, direction, and velocity of fluid flow are disclosed. The hydraulic device includes a flush valve. The flush valve includes one or more venturi that assist in moving the fluid through flush valve. A manifold includes a housing defining a piston cavity and a piston. The piston is moveable within the piston cavity by a piston actuator between a first position and a second position. A manifold inlet defined by the housing is configured to receive a first fluid from a supply line and is in fluid communication with the piston cavity. A manifold outlet is defined by the housing and is in fluid communication with the piston cavity in. In the first position, the piston prevents fluid communication between the manifold inlet and the manifold outlet through the piston cavity. In the second position, the manifold inlet is in fluid communication with the manifold outlet such that the first fluid can flow from the supply line to the manifold outlet through the piston cavity.