Hydac Fluidtechnik Gmbh

Markus Bill

Peter Bruck

Frank Schulz

Philipp Hilzendegen

Gerd Schneider

Maximilian Felix Hess

Alois Hoffmann

Franz-Rudolf Hell

Markus Veit

Nicola-Vincenzo Porta

Benjamin Röder

Olaf Pippel

Maximilian Felix Heß

Dennis Hettinger-Bartholome

The invention relates to a valve, in particular a proportional pressure regulating valve, comprising a valve housing () and a valve piston () which is arranged in the valve housing in a longitudinal a movable manner and which can be actuated by means of an actuation magnet () so as to produce either a fluidic connection between a pressure supply connection (P) and a load connection (A) or between the load connection (A) and a return connection (T) in the valve housing (), wherein the valve piston () is permanently fluidically connected to the return connection (T) at the opposing end faces () of the valve piston. The invention is characterized in that the valve piston () has a pressure-active measuring surface () in the region of the load connection (A), said pressure-active measuring surface providing the respective fluid pressure at the load connection (A) as a counterforce to the actuation force of the actuation magnet () when the actuation magnet () is energized in order to produce a fluidic connection between the pressure supply connection (P) and the load connection (A).

Valve for providing a fluid-conducting connection between a pressure supply port and a consumer port or between the consumer port and a return port

A valve, in particular having the form of a 2/2-way seat valve includes a pressure limiting function () integrated in a joint valve body to implement a thermal overpressure protection.

Valve

A device includes a regulating piston () guided longitudinally movably in a housing () and interacting with a control edge (), at a pressure supply port (P) that supplies a utility port (A) in regulating positions of the regulating piston () with fluid. The pressure can be preset via a fluid connection, pulling the regulating piston towards a closed position blocking this fluid connection due to occurring flow forces. The regulating piston () has a change of shape () from its general outer basic shape in the area of the control edge () of the housing () for a flow force compensation. A flow contact surface for fluid is provided causing a compensating force acting against the flow force to be introduced into the regulating piston (), which flow force pulls the regulating piston () into an open position opposite from the blocked position. The change of shape () also follows a step function, the function graph of which has at least one step more than the number of steps required to form the control edge ().

Device and valve for flow force compensation

A discharge pressure scale () includes a valve housing () having a functional connector (A), a return flow connector (T) and a user connector (). A valve piston () is guided such that it moves longitudinally against the effect of an energy accumulator (), moving from a respective opening or regulating position, against a valve seat (), into a closed position. The user connector () and return flow connectors (T) are separated from one another. The fluid pressure present at the user connector () can be guided onto a pressure-active surface (A*) of the valve piston () by a pressure compensation device () in such a way that it moves into its respective opening or regulating position in a pressure-compensated manner due to the force of the energy accumulator ().

Discharge pressure scale and lifting-lowering device having a discharge pressure scale of this type

A pressure-regulating valve has a valve piston () subjected to the action of an energy store and guided longitudinally in a valve housing (). The valve housing has a supply port (), a utility port () and a tank port () actuated by a control part () closing with a sealing action. In connecting from the supply port to the utility port, a pressure reduction function is realized. In a fluidic connection from the utility port to the tank port, a pressure-limiting function is realized. The control part () has a control rod () with two control bodies () spaced apart from one another. One control body () controls the connection between supply port () and utility port (). The other control body () controls the connection between utility port () and tank port ().

Pressure-regulating valve

A pressure retaining valve () has a main control piston () guided longitudinally displaceably in a single-piece or multiple-piece valve housing () and a non-return piston (). In a pressure retaining position, a fluid-conducting connection between connection points () is shut off by the two pistons (). Connection point () serves to feed media. Connection point () discharges media. Connection point () leads to a hydraulic consumer. In a load-raising position, the two pistons () move relative to one another into a release position, in which the connection between the medium feed () and the consumer is established. In a load-reducing position, the two pistons () assume a spacing from one another such that the connection between the medium discharge () and the consumer is established. A monitoring device () determines the individual switching positions of the pistons () to ensure reliable functioning of the pressure retaining valve ().

Pressure retaining valve

A pilot-controlled directional control valve, in particular a directional poppet valve, has a valve housing (), at least three fluid connection points (), a main control stage () and a pilot control stage. A further fluid-controlling intermediate stage () is arranged between the main control stage () and the pilot control stage (). The main control stage () has a longitudinally movable main control piston (). The pilot control stage has a longitudinally movable pilot control piston ().

Pilot-operated directional control valve

A valve, in particular for hydraulic circuits, includes a valve body () designed as a cartridge that can be fixed in a housing () having fluid connections () by a securing device (). The securing device has at least one blocking element () in the form of a separate component between the valve body () and the housing (). The blocking element has blocking surfaces that can be moved relative to the longitudinal axis () of the valve body () between an assembly position allowing the valve body () to be inserted into the housing () and a blocking position in which the blocking surfaces secure the valve body in an assembly position, preferably with zero backlash by bearing against retaining surfaces () of the housing () and the valve body ().

A valve, in particular a pilot-operated proportional directional poppet valve, has a valve housing () with a fluid inlet () and a fluid outlet (). The fluid stream between the fluid inlet () and the fluid outlet () is adjustable by a main piston (). A pilot valve chamber () provided on a rear face () of the main piston () has a pilot valve closing member () movable by an actuating device (). By closing member () the fluid stream between the pilot valve chamber () and the fluid outlet () can be adjusted. An inlet aperture () is arranged between the fluid inlet () and the pilot valve chamber (). A maximum volumetric flow controller () is in the main piston () in an outflow between the pilot valve chamber () and the fluid outlet ().

Valve, in particular pilot-operated proportional directional poppet valve

A directional poppet valve () has valve pistons (-) arranged in a valve housing () for controlling a plurality of fluid connections (A, B, P, T). The positions of each valve pistons (-) in the valve housing () can be changed by at least one actuating device. The fluid connections (A, B, P, T) are connected to one another or separated from one another alternately depending on the position of the valve pistons (-). The valve pistons (-) are arranged inline along at least one axis (R), consecutively and/or at least such as to partially interengage, in the valve housing ().

Directional poppet valve

A valve, in particular a pilot-operated proportional directional poppet valve, has a valve housing () with a fluid inlet () and a fluid outlet (). The fluid stream between the fluid inlet () and the fluid outlet () is adjustable by a main piston (). A pilot valve chamber () on a rear face () of the main piston () has a pilot valve closing member () movable by an actuating device () to adjust the fluid stream between the pilot valve chamber () and the fluid outlet (). A supply aperture () is between the fluid inlet () and the pilot valve chamber (). The opening cross-section of the supply aperture () can be reduced by a control element ().

A valve device includes a valve housing () and a valve piston () axially displaceably in a housing bore (). By valve piston movement, load connections (A, B) can alternately be connected to a pressure connection (P) and to a tank connection (T, T) by solenoid magnets (). Pilot control chambers () pressurize piston back sides (). The control chambers () are connectable via fluid-conducting connections () to the pressure connection (P). Pilot control pistons () release or close fluid-conducting connections () between control chambers () and the tank connection (T, T). One pilot control piston () includes a ring channel () controlling a fluid-conducting connection () between a pilot control chamber () and a tank connection (T, T).

Valve device

A valve device includes a housing () and a valve piston () axially displaceable in a piston bore () of housing (). First and second load connections (A, B) can alternately be connected to a pressure connection (P) and to tank connections (T, T) by moving the piston from an idle position by first and second solenoids (). First and second pilot control chambers () pressurize first and second piston back sides () of the valve piston (). The pressure in the pilot control chambers () is controlled by first and second pilot control pistons () movable by the solenoids (). The pilot control chambers () are connected via a connection () to the pressure connection (P). The pilot control pistons () open or close connections () between the pilot control chambers () and the tank connections (T, T).

A piloted proportional throttle valve has a valve piston () displaceably guided in the longitudinal direction in a valve housing () having a fluid inlet () and outlet (). The front side of the valve piston () can be pressurized against a main valve seat () by fluid pressure acting on its back side. A pilot valve device has an actuating member () displaceable in the longitudinal direction by an electrically actuatable magnet system (), and works with a pilot valve seat () in a bore () of the valve piston () connecting its back side to the fluid outlet () on the front side of the piston. The fluid pressure on the back side of the piston () is reduced for an opening motion when the pilot valve seat () is released. A flow baffle device () is disposed between the back side of the piston and the fluid inlet () of the housing () to build up the fluid pressure pressurizing the piston () against its closed position by introducing pilot fluid. The flow baffle device () has a device for performing filtration, preferably gap filtration, of the pilot fluid.

Piloted valve, particularly proportional throttle valve

A proportional throttle valve includes a valve piston () functioning as a variable orifice and displaceably guided in the longitudinal direction in a valve housing () having a fluid inlet () and a fluid outlet (). Since a leading edge () of the valve piston () is formed by a control piston () of a flow regulator () for the fluid connection of the fluid inlet () and the fluid outlet (), the flow control valve and the proportional throttle valve are functionally combined in one valve unit.

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Heusweiler, Germany

Markus Bill