Abstract: The present disclosure refers to a modular motor pump unit having an outer housing with two open ends, two housing covers attachable to the open ends, at least one electric motor arranged in the outer housing, at least one pump element arranged in the outer housing and drivable by the electric motor, and at least one connection portion arranged externally on the outer housing. The outer housing forms a hydraulic fluid reservoir, a pressure channel extending from the pump element to the connection portion. A return channel extends from the connection portion to the inside of the outer housing. An additional housing is provided between the outer housing and at least one housing cover. A heat exchanger element is arranged in the additional housing and the return channel is connected to the additional housing and the additional housing is connected to the hydraulic fluid reservoir.

Abstract: The present invention relates to a dual-stage pump for a hydraulic system with a housing, a high and low-pressure pump element, a common pressure outlet and a switching valve that is arranged between a tank connection and the low-pressure pump element. The switching valve has a spring element and a piston being movable against a force of the spring element relative to the housing and having a closing member that can be lifted from a valve seat by a control pressure that is tapped on the pressure outlet and applied in a control pressure chamber. On the one hand, the invention is characterized in that the switching valve comprises a tappet that is movable relative to the housing and configured to move the piston and arranged between the control pressure chamber and the piston and has a smaller effective diameter than the piston.

Abstract: The present disclosure refers to a modular motor pump unit having an outer housing with two open ends, two housing covers attachable to the open ends, at least one electric motor arranged in the outer housing, at least one pump element arranged in the outer housing and drivable by the electric motor, and at least one connection portion arranged externally on the outer housing. The outer housing forms a hydraulic fluid reservoir, a pressure channel extending from the pump element to the connection portion. A return channel extends from the connection portion to the inside of the outer housing. An additional housing is provided between the outer housing and at least one housing cover. A heat exchanger element is arranged in the additional housing and the return channel is connected to the additional housing and the additional housing is connected to the hydraulic fluid reservoir.

Abstract: The present invention relates to a dual-stage pump for a hydraulic system with a housing, a high and low-pressure pump element, a common pressure outlet and a switching valve that is arranged between a tank connection and the low-pressure pump element. The switching valve has a spring element and a piston being movable against a force of the spring element relative to the housing and having a closing member that can be lifted from a valve seat by a control pressure that is tapped on the pressure outlet and applied in a control pressure chamber. On the one hand, the invention is characterized in that the switching valve comprises a tappet that is movable relative to the housing and configured to move the piston and arranged between the control pressure chamber and the piston and has a smaller effective diameter than the piston.

Abstract: A pump aggregate (A) comprises a housing (1, 2, 4), a high-pressure pump (5) and a low-pressure pump (6) disposed in the housing, an oil-immersed electric motor (7), a return connection point (8) connected to a return line (9), and a valve arrangement (V) mounted between separated discharge outlet ports of both pumps (5, 6) and a pressure connection point (P). The valve arrangement (V) comprises at least a low-pressure change-over valve (U), a check valve (R) for combining discharge flows of both pumps (5, 6), and a system pressure-limiting valve (DB). At least the low-pressure change-over valve (U) and the check valve (R) are arranged in an interior of the housing (1, 2, 4) and are connected so that the discharge flows of both pumps (5, 6) are combined in the housing interior for a single pressure outlet (13, P?) of the housing, and wherein the system pressure-limiting valve (DB) is connected to the pressure outlet and is mounted on an exterior of the housing.

Abstract: In a, in particular, portable motor pump assembly comprising an oil housing in which an electric motor and a pump and on which a manifold block as well as a cooling fan are mounted, the cooling fan is disposed between ends of the oil housing on an oil housing side wall. The oil housing is, except for at least one blow-out port, clad in an outer housing for guiding cooling air at least onto side walls of the oil housing, and the outer housing is fixed to the oil housing.

Abstract: In a hydraulic control device H comprising a pressure source P which can be switched on and switched off, a reservoir R and a pressure switch W located in a discharge path 13 from a valve assembly V to the reservoir R, which pressure switch W either connects the valve assembly V with the reservoir R or blocks the valve assembly V versus the reservoir R, the pressure switch W contains a displaceable control member 16 which is actuated in a first switching direction by a spring 17 and a pilot pressure originating from the pressure P1 acting at the valve assembly V and in a second switching direction to a control position blocking the discharge path 13 by a pilot pressure originating from the supply pressure of the pressure source, the pressure switch W is designed as a 2/2-multi-way seat valve 16 operating with a blocking position without leakage. A valve member 24 forms the control member 16 and co-operates with a valve seat 25 arranged in the discharge path 13.

Abstract: A pump aggregate (A) comprises a housing (1, 2, 4), a high-pressure pump (5) and a low-pressure pump (6) disposed in the housing, an oil-immersed electric motor (7), a return connection point (8) connected to a return line (9), and a valve arrangement (V) mounted between separated discharge outlet ports of both pumps (5, 6) and a pressure connection point (P). The valve arrangement (V) comprises at least a low-pressure change-over valve (U), a check valve (R) for combining discharge flows of both pumps (5, 6), and a system pressure-limiting valve (DB). At least the low-pressure change-over valve (U) and the check valve (R) are arranged in an interior of the housing (1, 2, 4) and are connected so that the discharge flows of both pumps (5, 6) are combined in the housing interior for a single pressure outlet (13, P?) of the housing, and wherein the system pressure-limiting valve (DB) is connected to the pressure outlet and is mounted on an exterior of the housing.

Abstract: In a screw-in multi-way seat valve V comprising a screw-in housing 1, in which at least one sleeve 21 is positioned axially which sleeve 21 forms a valve seat 20, and a valve member 15 provided inside and having a seat surface 31 with a larger outer diameter than the inner diameter of the valve seat 20, the sleeve 21 is axially positioned in the screw-in housing 1 by a threaded connection 23 and at the same time is sealed by a press fit zone 24, the press fit zone 24 forming an anti-rotation protection for the threaded connection 23.

Abstract: In a screw-in multi-way seat valve V comprising a screw-in housing 1, in which at least one sleeve 21 is positioned axially which sleeve 21 forms a valve seat 20, and a valve member 15 provided inside and having a seat surface 31 with a larger outer diameter than the inner diameter of the valve seat 20, the sleeve 21 is axially positioned in the screw-in housing 1 by a threaded connection 23 and at the same time is sealed by a press fit zone 24, the press fit zone 24 forming an anti-rotation protection for the threaded connection 23.

Abstract: In a hydraulic control device H comprising a pressure source P which can be switched on and switched off, a reservoir R and a pressure switch W located in a discharge path 13 from a valve assembly V to the reservoir R, which pressure switch W either connects the valve assembly V with the reservoir R or blocks the valve assembly V versus the reservoir R, the pressure switch W contains a displaceable control member 16 which is actuated in a first switching direction by a spring 17 and a pilot pressure originating from the pressure P1 acting at the valve assembly V and in a second switching direction to a control position blocking the discharge path 13 by a pilot pressure originating from the supply pressure of the pressure source, the pressure switch W is designed as a 2/2-multi-way seat valve 16 operating with a blocking position without leakage. A valve member 24 forms the control member 16 and co-operates with a valve seat 25 arranged in the discharge path 13.

Abstract: A pump aggregate A comprises a one-piece cast hollow body 1 including an exterior connection block 3 and an interior lateral wall 16 of a bearing shield. A pressure transmission path is formed by a channel K which is made by casting in the lateral wall 16 of the bearing shield and which extends from the connection block 3 into a pump element mounting surface 18, 18?, 18? of the lateral wall 16 of the bearing shield.

Abstract: A twin manifold seat valve comprising at least two closure members S1, S2, S3 each functionally associated with at least one valve seat D1, D2, D3, D4. At least one of the closure members is moved to a blocking position with predetermined blocking force at the valve seat upon energization of a solenoid and counter to the force of a spring 22, 7. A single common solenoid M is functionally associated to both closure members S1, S2, S3 by two pivotably supported reduction levers U1, U2. The armature 2 of the solenoid actuates both reduction levers U1, U2. The closure members are located on the same side of the pivot support of the reduction levers. A spring member is integrated into at least one of the reduction levers. The solenoid armature deforms the spring members to generate the closure member blocking force by moving the closure members into contact with their respective seats.

Abstract: A electrohydraulic control device H for the direction control of a hydro-motor, particularly for working pressures u to more than about 450 bar in a portable working device, comprises working lines A, B and a pressure line P and a respective load holding valve LA, LB in each working line A, B which load holding valve is switched from a load holding position for the respective working line to open to a return system R when a main directional solenoid seat valve VA, VB is in a switching position connecting the pressure source P with the respective other working line, and a circulation switching assembly U effective between the pressure source P and the return system R when the working lines A, B are separated from the pressure source P contains as the respective load holding valve LA, LB a 2/2-directional solenoid seat valve which selectively and electrically is switched open towards the return system R for, by intention, relieving the working pressure from the associated working line A, B.

Abstract: In a twin-solenoid valve D comprising two valve members V which are located side by side and are actuated in closing direction by a common solenoid M via a T-shaped force transmitting member, a stem 4 of which is guided in a slide guidance 3, a radial safety clearance X is provided between the slide guidance 3 and the stem 4, and a tilt joint K is formed between the stem 4 and an armature B or a movably guided armature ram 2 of the solenoid M.

Abstract: A pump aggregate A comprises a one-piece cast hollow body 1 including an exterior connection block 3 and an interior lateral wall 16 of a bearing shield. A pressure transmission path is formed by a channel K which is made by casting in the lateral wall 16 of the bearing shield and which extends from the connection block 3 into a pump element mounting surface 18, 18?, 18? of the lateral wall 16 of the bearing shield.

Abstract: A electrohydraulic control device H for the direction control of a hydro-motor, particularly for working pressures u to more than about 450 bar in a portable working device, comprises working lines A, B and a pressure line P and a respective load holding valve LA, LB in each working line A, B which load holding valve is switched from a load holding position for the respective working line to open to a return system R when a main directional solenoid seat valve VA, VB is in a switching position connecting the pressure source P with the respective other working line, and a circulation switching assembly U effective between the pressure source P and the return system R when the working lines A, B are separated from the pressure source P contains as the respective load holding valve LA, LB a 2/2-directional solenoid seat valve which selectively and electrically is switched open towards the return system R for, by intention, relieving the working pressure from the associated working line A, B.

Abstract: In a twin manifold seat valve comprising at least two closure members S1, S2, S3 each of which is functionally associated to at least one valve seat D1, D2, D3, D4, of which closure members at least one is achieving a blocking position with predetermined blocking force at the valve seat upon energising a solenoid and counter to the force of a spring 22, 7 by means one of two pivotably supported reduction levers U1, U2 a single common solenoid M is functionally associated to both closure members S1, S2, S3, the armature 2 of which actuates both reduction levers U1, U2.

Abstract: In a twin-solenoid valve D comprising two valve members V which are located side by side and are actuated in closing direction by a common solenoid M via a T-shaped force transmitting member, a stem 4 of which is guided in a slide guidance 3, a radial safety clearance X is provided between the slide guidance 3 and the stem 4, and a tilt joint K is formed between the stem 4 and an armature B or a movably guided armature ram 2 of the solenoid M.

Abstract: A motor pump aggregate M has a housing 1 defining an oil reservoir with first and second chambers R1, R2. An electromotor 2 is driving via its motor shaft W at least one radial piston pump arrangement P1 provided within said first chamber R2. Both chambers R1, R2 are separated by a separation wall 7. A filling and pressure biasing system V is provided for said first chamber R1 in order to adjust within said first chamber R1 a predetermined oil filling level and a pre-selected oil pressure pre-biasing for said radial piston pump arrangement P1.