Abstract: A method for controlling a vapour compression system (1) including a compressor unit (2) including one or more compressors (3, 12), a heat rejecting heat exchanger (4), a receiver (6), an expansion device (7) and an evaporator (8) arranged in a refrigerant path. A pressure value indicating a pressure prevailing inside the receiver (6) is obtained, and the obtained pressure value is compared to a first threshold pressure value. In the case that the obtained pressure value is below the first threshold pressure value, the compressor(s) (3, 12) of the compressor unit (2) are controlled in order to reduce a suction pressure of the vapour compression system (1).

Abstract: A hydraulic piston machine is described comprising a piston (1) having a hollow (2) secured by a wall (3) and an insert (4) arranged in the hollow. Such a machine should have a high efficiency at low costs. To this end the insert (4) comprises a section (29) which extends out of the hollow (2).

Abstract: The present disclosure provides a variable-frequency compressor with adaptive heating power control and a method for operating the same. According to an embodiment of the present disclosure, the variable-frequency compressor includes: a compression unit, for compressing a medium entering the variable-frequency compressor; a motor, including a stator and a rotor, for driving the compression unit; and a controller, configured to adaptively control a heating power of a winding of the stator according to information of the variable-frequency compressor.

Abstract: Hydraulic axial piston unit having a rotational group for driving or being driven by a driving shaft, and a tiltable displacement element for adjusting the displacement volume of the rotational group. The rotational group includes a rotatable cylinder block in which working pistons are mounted reciprocally moveable in cylinder bores for conveying hydraulic fluid from an inlet port to an outlet port on a valve segment. At least two control ports are located on the valve segment each between the inlet port and the outlet port. The control ports can be brought sequentially in fluid connection with the cylinder bores when the cylinder block is rotating. At least one hydraulic fluid injector is connected fluidly to one control port, for sequentially injecting pressurized hydraulic fluid via the control port into the passing cylinder bores. Via the other control port hydraulic fluid can be drained from passing cylinder bores.

Abstract: An actuation device for actuating a circuit breaker, has a circuit arrangement and a plurality of resistor devices, wherein a plurality of first switching elements of the circuit arrangement are connected to a respectively assigned first voltage source and a respectively assigned resistor device and have a switching input that is connected to an actuation logic unit, wherein this actuation logic unit furthermore has a superordinate actuation input and a plurality of sensor inputs. A method for operating such an actuation device is also presented, wherein, during the switching-on or the switching-off process of the circuit breaker, the plurality of first switching elements are switched on in a clocked manner and therefore generate a target voltage profile at the control input of the circuit breaker.

Abstract: The invention relates to a method (19) of operating a hydraulic arrangement (1) including a mounting base (5), a boom (3) that is pivotably arranged on the mounting base (5), and a Z-kinematics (2) that is arranged on the boom (3). The Z-kinematics (2) tilts a tool attachment device (10), that is pivotably arranged on the boom (3). The boom (3) is moved by a lifting hydraulic piston (7) that is connected to the boom (3) and to the mounting base (5). The Z-kinematics (2) is moved by at least a tilting hydraulic piston (11) that is connected to a lever of the Z-kinematics (2) and to the mounting base (5). On application of an input control command for changing the position of the lifting hydraulic piston (7), a compensation command is automatically generated and applied to the tilting hydraulic piston (11), to essentially maintain the attitude of the tool attachment device (10).

Abstract: A self-healing hydraulic seal is provided. The self-healing hydraulic seal is prepared from a water-swellable elastomeric composition comprising a base polymer and a plant-based polysaccharide.

Abstract: Manual displacement control device (MDC) for hydraulic units has an input shaft mounted rotatably about an input shaft axis in an input shaft block. The input shaft protrudes from the input shaft block with a first end, onto which a rotating torque can be applied. The MDC further includes a control spool housed in a control housing, which is moveable by means of rotating the input shaft for controlling a servo pressure. The control device has positioning means for adjusting and fixing the lateral position of the input shaft with respect to the control housing in a direction perpendicular to the input shaft axis and perpendicular to the direction of a restoring force exerted on the input shaft. The hydraulic unit is adjustable to its neutral position by means of a servo spring bracket providing an end stop surface for a servo spring seat towards the displacement element.

Abstract: A plate heat exchanger (1) includes a stack of plate elements (2), each plate element (2) being of a double wall construction having a first heat transfer plate (10) and a second heat transfer plate (20), each having a central heat exchanging portion (40) provided with surface patterns (45) adapted for a surface pattern (45) of first heat transfer plate (10) of one plate element (2) to contact a surface pattern (45) of a second heat transfer plate (20) of a neighbouring plate element (2) forming a first flow path (A) for a first fluid at the one side and second flow path for a second fluid (B) at the second side of a plate element (2), where the plate elements (2) are formed with openings (3a, 3b, 3c, 3d) in opening areas (30a, 30b, 30c, 30d), wherein a first heat transfer plate (10) in an opening area (30a, 30b, 30c, 30d) is formed with a closed projection (50) projecting in a first direction, and in the same opening area (30a, 30b, 30c, 30d) is formed with an open projection (65) formed on a second directio

Abstract: The present disclosure relates to a hydraulic valve that has a two-stage con-struction that provides for higher fluid flow and lower power consumption. The present disclosure also relates to a hydraulic valve that may be constructed to include a pilot-poppet, a pilot-poppet valve seat, and a main-poppet. The main-poppet may be mechanically isolated from the pilot-poppet by the pilot-poppet valve seat.

Abstract: Hydraulic fluid flushing valve for hydrostatic units usable in closed hydraulic circuit propel applications, having a flushing valve housing with a first inlet port connected to a first working line, a second inlet port connected to a second working line, and a discharge port for draining hydraulic fluid. A two-sided flushing valve flushing valve spool which can be shifted is mounted within the flushing valve housing in a cylindrical valve bore, which, in a shifted position, enables a fluid flow from one of the first or the second inlet port at which the lower hydraulic pressure is present, to the discharge port. The flushing valve spool includes on each side a pressure surface each of which is connected to one of the two inlet ports.

Abstract: A sensor arrangement (1) is described comprising a sensor housing (2) and a mounting connector (3). Such a sensor arrangement should be soldered to a refrigeration system without being sensitive for vibrations during operation of the system and without deteriorating a sensor arranged in the housing. To this end the mounting connector (3) is at least partly made of a bi-metal material with an inner layer (10) of steel and an outer layer (11) of copper.

Abstract: A distributor for a plate heat exchanger includes a tube part having a tube wall and having a first end and a second end; a first flange formed at the first end; and a connecting protrusion. The connecting protrusion projects from the tube wall of the tube part in a direction away from an axis of the tube part, and projects from the first flange at the inside of the outer edge of the first flange in a direction towards the second end of the tube part; the connecting protrusion has a connecting protrusion wall, which has an axial connecting protrusion wall that faces in the axial direction of the tube part and is remote from the first flange, the axial connecting protrusion wall being between the first end and the second end of the tube part, and having at least one through-hole.