Abstract: A hydraulic steering arrangement (1) comprising a supply port arrangement having a pressure port and a tank port, a working port arrangement having two working ports (L, R), a mechanical steering unit (3) connected to a steering wheel (2) and being arranged between the supply port arrangement and the working port arrangement (L, R), supply valve means (12) having a connection to the pressure port and to the working port arrangement (L, R) and being controlled by a controller (10), and a steering wheel sensor (9) connected to the controller (10) is described. Such a steering arrangement could allow a comfortable feeling for the driver.

Abstract: A heat exchanger (100) and an air-conditioning system. The heat exchanger (100) comprises: a group of first heat exchange tubes (T1) for forming a first loop (C1); a group of second heat exchange tubes (T2) for forming a second loop (C2); and a group of fins (3), at least a plurality of fins (3) in the group of fins (3) being in contact with both at least a plurality of first heat exchange tubes (1) in the group of first heat exchange tubes (T1), and at least a plurality of second heat exchange tubes (T2) in the group of second heat exchange tubes (T2). If one loop of an air-conditioning system having two loops is closed, heat exchange regions of the fins for the loop can be used in the other loop, thereby improving the heat exchange efficiency of a heat exchanger.

Abstract: The centrifugal turbo-compressor (2) includes a hermetic casing (3); a drive shaft (6) having a longitudinal axis and rotatably arranged within the hermetic casing (3); a compression stage including an impeller (17) connected to the drive shaft (6); a gas suction inlet (42); and a gas flow path (P) fluidly connected to the gas suction inlet (42) and configured to supply the compression stage with a gas flow. The gas flow path (P) includes a relaxation chamber (46) at least partially surrounding the drive shaft (6), the gas suction inlet (42) emerging substantially radially into the relaxation chamber (46); and a plurality of inlet flow guide channels (51) fluidly connected to the relaxation chamber (46) and angularly distributed around the longitudinal axis of the drive shaft (6), the inlet flow guide channels (51) extending radially towards the drive shaft (6) and being axially offset from the gas suction inlet (42) and the relaxation chamber (46).

Abstract: A system and method for the controlled lowering and lifting of a load are disclosed. The system and method may include operating a work machine having a hydraulic system including a hydraulic actuator for supporting a load, a first control valve in fluid communication with the actuator, and a controller for operating the first control valve. In one embodiment, the controller includes a first algorithm for operating the first control valve in a load lowering operation. When an operational fault within the hydraulic system is detected, the controller can be configured to enter into a safe lowering mode. In the safe lowering mode, the first algorithm is disabled and a pulse width modulation (PWM) current is sent from the controller to the first control valve. A user interface is provided to allow an operator to control the PWM current duty ratio to allow the load supported by the actuator to be lowered.

Abstract: The present invention provides a counterweight for a compressor, an electric motor, with the counterweight, for a compressor, and a compressor with the electric motor or the counterweight. The counterweight comprises: a first component having an annular shape; a first groove formed in a surface of the first component and having a sidewall and a bottom wall; and a second component disposed in the first groove. With the technical solution according to the present invention, for example, counterbalance requirements are met, while fluid can be prevented from being stirred to cause power loss.

Abstract: An actuator of a refrigerant valve is described, the actuator comprising a housing (5) having a chamber (12) with an opening (15) in an end face (26) of an end section (17) of the housing (5), the end section (17) having an outer thread (18), a tightening collar (6) having a radially inwardly protruding flange (20) and an inner thread (19) matching the outer thread (18), and an anchor ring (7) positionable between the tightening collar (6) and the end face (16), wherein the anchor ring (7) is elastically deformable at least in a radial direction with respect to an axis of the outer thread (18) and in a mounted condition at least partially overlaps the end face (16) and the flange (20) of the tightening collar (6), wherein a sealing ring (8) at the end face (16) shows a free side to the axial direction and is com-pressed by an axial force produced by screwing the tightening collar (6) onto the outer thread (18).

Abstract: A hydraulic system (600) and method for reducing boom dynamics of a boom (30), while providing counter-balance valve protection, includes a hydraulic actuator (110), first and second counter-balance valves (300, 400), first and second control valves (700, 800), and first and second blocking valves (350, 450). A net load (90) is supported by a first chamber (116, 118) of the hydraulic actuator, and a second chamber (118, 116) of the hydraulic actuator may receive fluctuating hydraulic fluid flow from the second control valve to produce a vibratory response (950) that counters environmental vibrations (960) on the boom. The first blocking valve prevents the fluctuating hydraulic fluid flow from opening the first counter-balance valve. The first blocking valve may drain leakage from the first counter-balance valve.

Abstract: The invention relates to a method (19) for starting an electric single-phase induction motor (1), wherein during a start-up interval of the start-up cycle for starting said electric motor (1), the frequency (fref) of the electric current for driving said electric motor (1) is set to a first frequency (fstart), and later to the operating frequency (frun) of the electric motor (1), wherein the first frequency (fstart) is higher than the operating frequency (frun).

Abstract: The invention relates to a capsule for a valve as well as to a valve comprising such a capsule. The task of the present invention is to provide a valve in which tight tolerances for construction can be achieved and the assembly of the valve is simplified. According to the present invention the above task is solved by a capsule (1) for a valve comprising at least one diaphragm (2), a valve seat (3), a capsule inlet (5) and a capsule outlet (6). The valve seat (3) is openable and closable to permit or stop a fluid flow from the capsule inlet (5) to the capsule outlet (6). The above task is also solved by a capsule (1) for a valve that comprises at least one diaphragm (2), a valve seat (3), a capsule inlet (5) and a capsule outlet (6), wherein the capsule (1) is structured and arranged to control the position of a pilot valve element external to the capsule (1).

Abstract: The present invention is directed at a pulse shift protection method for detecting a phase-to-phase short circuit in a drive for controlling electric motors, wherein the drive provides an output voltage to the electric motor, and wherein the instant, at which a short circuit detection function is executed, is chosen to minimize disturbance in the output voltage of the drive. The invention is also directed at a drive for controlling electric motors, said drive including a controlling portion for generating an output signal and an output portion connectable to an electric motor. The drive is provided for executing the above-mentioned pulse shift protection method.

Abstract: A valve plate assembly (1) of a hydraulic axial piston machine is described, the valve plate assembly comprising a wear plate (2) made of a ceramic material surrounded by a compression ring (4). Such a valve plate assembly should be produced and maintained in a cost-effective manner. To this end, the wear plate (2) is connected to a support plate (3) by means of the compression ring (4).

Abstract: Embodiments of the present invention disclose a heat exchanger and an air-conditioning system. The heat exchanger comprises heat exchange tubes. The heat exchange tubes comprise first heat exchange tubes configured to form a first circuit, and second heat exchange tubes configured to form a second circuit. With the heat exchanger and the air-conditioning system according to the embodiments of the present invention, for example, a heat exchange capacity of the heat exchanger in a part load condition is improved.

Abstract: A method for terminating defrosting of an evaporator (104) is disclosed. The evaporator (104) is part of a vapour compression system (100). The vapour compression system (100) further comprises a compressor unit (101), a heat rejecting heat exchanger (102), and an expansion device (103). The compressor unit (101), the heat rejecting heat exchanger (102), the expansion device (103) and the evaporator (104) are arranged in a refrigerant path, and an air flow is flowing across the evaporator (104). When ice is accumulated on the evaporator (104), the vapour compression system (100) operates in a defrosting mode. At least one temperature sensor (305) monitors a temperature Tair, of air leaving the evaporator (104). A rate of change of Tair is monitored and defrosting is terminated when the rate of change of the temperature, Tair, approaches zero.

Abstract: The present invention relates to a hydraulic pump system including a variable displacement pump that generates an outlet pressure. The hydraulic pump system also includes a control system that decreases a displacement volume of the variable displacement pump in response to an increase in the outlet pressure and increases a displacement volume of the variable displacement pump in response to a decrease in the outlet pressure.

Abstract: A driving system for a vehicle includes one or more sensors, a controller, an actuator, and a safety shut down switch. The controller includes a main processing circuit, a main processing module, an actuator drive, a safety processing circuit, a safety processing module, and a safety shutdown switch. The safety processing module is independent of the main processing module, and the safety processing module is configured to perform one or more safety functions.

Abstract: A system for damping mass-induced vibrations in a machine having a long boom or elongate member, the movement of which causes mass-induced vibration in such boom or elongate member. The system comprises at least one motion sensor operable to measure movement of such boom or elongate member resulting from mass-induced vibration, and a processing unit operable to control a first control valve spool in a pressure control mode and a second control valve spool in a flow control mode in order to adjust the hydraulic fluid flow to the load holding chamber of an actuator attached to the boom or elongate member to dampen the mass-induced vibration. The system further comprises a control manifold fluidically interposed between the actuator and control valve spools that causes the first and second control valve spools to operate, respectively, in pressure and flow control modes.

Abstract: A half bridge power module (1) comprising a substrate (2) comprising an inner load track (11), two intermediate load tracks (12, 14) and two outer load tracks (10,13), wherein an external terminal is mounted on one of the intermediate load tracks (12, 14), an external terminal (3, 4) is mounted on one of the outer load tracks (10, 13) and an external terminal (5) is mounted on the inner load track (11); wherein semiconductor switches (101, 12, 105, 106) are mounted on the outer load tracks (10, 13) and are electrically connected to the intermediate load track (12); and semiconductor switches (103, 104, 107, 108) are mounted on the intermediate load tracks (12, 14) and are electrically connected to the inner load track (11).

Abstract: A piston ring (10) for forming a seal between a piston (26) and piston housing (28). The piston ring (10) has first and second orthogonal axes (12, 14) and a body portion (18) which is resiliently deformable in the direction of the first axis (12) and is substantially rigid in the direction of the second axis (14).

Abstract: The bearing arrangement includes a one-piece gas bearing sleeve (32) configured to rotatably support the drive shaft (4) and made in molybdenum or in a molybdenum alloy, the one-piece gas bearing sleeve (32) including a radial bearing surface (33) configured to Surround the drive shaft (4).

Abstract: The invention relates to a method of venting a synthetically commutated hydraulic pump (2). The connecting fluid conduits (8, 16), connecting said synthetically commutated hydraulic pump (2) with a fluid reservoir (7) is vented at least on start-up of the synthetically commutated hydraulic pump (2), using a fluid intake device (14, 17, 20) that connects to a fixed displacement pump (3).