Abstract: An inlet nipple and a housing having a water passage extending therethrough that have first, second and third water bore portions of progressively larger diameters in a downstream direction. A variable throttle point is formed by a fixed member and a movable member acting in conjunction with the bore portions that produce a turbulent flow causing cavitation downstream of the throttle point independently of the quantity of flow. In one embodiment the movable member includes a closure portion seatable against a seat formed at the intersection of the bore portion and an annular portion that in conjunction with a bore portion forms an annular water flow space downstream of the closure portion. In the second embodiment the fixed member has a closure portion converging toward an aperture in the movable member which is in the shape of a cup.

Abstract: In a refrigeration system there is provided a main valve that has its inlet port fluidly connected to an evaporator while its outlet port is fluidly connected to the suction port of a motor-compressor. The closing of the main valve is controlled by an auxiliary valve, the auxiliary valve being connected in an auxiliary line that at one end opens to the gas port of a condenser or to a line between the condenser and the motor compressor. The auxiliary valve is connected in the auxiliary line in series with a fixed throttle and is downstream of the throttle. The closure member of the auxiliary valve opens on an increase in the evaporator pressure. A check valve, for example a two way magnetic valve, is connected between the auxiliary valve and the suction port.

Abstract: An electric laminar resistor and the method of making same wherein a thin metal film is applied to a ceramic substrate. Metal film material is removed to form a resistance track and recessed connecting zones at opposite ends of the track. A burnt-in thick layer paste is extended through the connecting zone recesses and solidified to form connecting elements that are adhered to the substrate. A glass frit coating is applied over the resistance track, but not over the connecting elements. The resistance of the resistor may be adjusted by separating a part of the track.

Abstract: A thermostatic mixing valve has a connection housing and an attachment housing which are joined together at abutting surfaces. The connection housing has hot, cold and mixed water passages which mate with respective hot, cold, and mixed water passages in the attachment housing. The attachment housing further has valve means for controlling the temperature and quantity of the mixed water.

Abstract: A housing mounts an input shaft with a clutch flange thereon, an output shaft with a clutch plate thereon, and bearings, sleeves and adjustment nuts for retaining the shafts in selected axially adjusted positions. The clutch plate and flange extend within a clutch chamber of the housing. Friction linings are mounted on the radial outer portion of the flange on opposite sides thereof. The radial outer portions of the plate and flange have depressions into which the linings extend whereby the axial dimension of the chamber is less than the combined axial dimensions of the linings and the plate and flange radially inwardly of and adjacent to the depressions. Switching apparatus provides a pressure differential on axial opposite sides of the plate to eleastically deform the plate between a neutral position, a braking position and a driving position.

Abstract: The invention relates to a device or arrangement for measuring the angle of rotation of the rotor of a rotary machine. Markings are applied circumferentially to a part of the rotor that is enclosed by the housing and a passage is provided in the housing which has an opening adjacent the markings. A sensor arrangement disposed at least partly in the housing passage has one end thereof adjacent the markings in a position for detecting the rotational movement of the markings. The snesor arrangement may have electrical, magnetic or optical capabilities.

Abstract: This invention relates to an insert freely displaceable in a coil spring that at opposite ends abut against spring support formed in a motor compressor unit capsule and a spring support formed by a stator plate. The spring supports project into the opposite ends of the spring to extend toward one another. The opposite ends of the insert are recessed to be of shapes generally corresponding to the adjacent parts of the supports. The insert serves as a transport abutment and permits lateral movement without excessively deforming of the spring.

Abstract: A control system for a two way acting hydraulic servomotor wherein the servomotor is connected in the diagonal of a bridge circuit that includes four magnetic valves with a pair of the valves being normally open in a non-energized condition being connected to the one end of the servomotor and to the container and a second pair of the valves being normally closed in a deenergized condition being connected to the opposite end of the servomotor and to a pressure source. Circuitry provides pulse trains that are modulatable to control the operation of the magnetic valves and thereby the application of pressurized fluid to the opposite ends of the servomotor.

Abstract: This invention relates to a thermostatic mixing valve that includes a housing, temperature control valves in the housing that have axially spaced cold and warm water regulating bases and a valve element for cooperating with the above valve bases to reversely vary the flow of the cold water and warm water to the housing outlet port, and cold and warm water quantity setting valves upstream of the temperature regulating valves for controlling the quantity of the cold and warm water flow from the housing cold water and warm water supply ports to the cold and water regulating valves respectively. The quantity setting valves have axially spaced quantity setting valve bases and a common valve member axially movable relative to the quantity setting valve bases for controlling downstream flow from the supply ports, the pressure at the supply ports acting in the same axial direction against the common valve member.

Abstract: The invention relates to a priority valve for a hydraulic installation having a main circuit and an auxiliary circuit. The priority valve has a slide member which primarily has a controlled throttle for dividing the supply fluid between the main and auxiliary circuits in accordance with the priority demands of the main circuit. The priority valve has a flow path leading to the auxiliary circuit which has throttle elements in series which provide pressure drops in steps to minimize cavitation when there is a rapid flow of fluid in the auxiliary circuit.

Abstract: An electric laminar resistor wherein a thin metal film is applied to a ceramic substrate. Metal film material is removed to form a resistance track and recessed connecting zones at opposite ends of the track. A burnt-in thick layer paste extends through the connecting zone recesses and solidified to form connecting elements that are adhered to the substrate. A metal powder and glass frit coating is applied over the resistance track. The resistance of the resistor may be adjusted by separating a part of the track.

Abstract: The invention relates to a device and method for regulating the superheat temperature of the evaporator of a refrigeration or heat pump system. The existing and desired superheat values are compared at intervals of two and the rate of departure between these two values is utilized for adjusting the desired superheat value.

Abstract: A hydraulic sealing apparatus for sealing an annular gap between two members which are movable relatively to each other and one of which has an annular groove for receiving the sealing apparatus, the groove having a side wall at least on the low pressure side, comprising an elastic ring and a slide ring which consists of a slidable plastics material and has an annular sealing rib at its free circumferential surface.

Abstract: The invention relates to a multi-groove and spline connection between a gear and cardan shaft of a rotary piston machine with an internal axis, wherein external toothing at the head of the cardan shaft engages internal toothing of the gear and an axial abutment co-operates with the end face of the head. The abutment is such that it is only contactable by the teeth of the head of the cardan shaft.

Abstract: The invention relates to an AC voltage supplied rectifier circuit with a downstream smoothing capacitor. A prior art problem with this type of circuit was that the inductive impedance of the supply voltage caused a practically umdamped oscillation between the inductive supply impedance and the smoothing capacitor during start-up which caused the voltage to rise to about twice the stationary value. A rectifier circuit is provided which substantially prevents the over-oscillation having at least one controllable rectifier which brings the rectifier to a conductive state during the charging period of the smoothing capacitor over such a time that the output direct voltage of the rectifier circuit exceeds the momentary capacitor voltage by no more than a predetermined limited value.

Abstract: An electric machine that includes a stator having a sheet metal packet which has an end plate at each end, and insulating plates abutting against the end plates. The packet has radially inwardly opening winding grooves. Insulating plates are provided at the ends of the packet and have recesses that correspond to the grooves and ribs that form abutment faces against which winding liners provided in the grooves abut. The ribs are shaped such that the windings emerging from the grooves will not cut through the liners when bent sharply. The ends of the groove liners are shaped by thermal stamping to lie against the side faces of the ribs.

Abstract: A pressure limiting valve including a body having an inlet and an outlet coaxially arranged at opposite ends of the body. A discharge passage is disposed in the body between the inlet and outlet. A cylindrical valve element is spring biased to a position to prevent communication between the inlet or outlet and the discharge passage. The valve element includes areas at opposite ends with one area being larger than the other so that pressure in the inlet and outlet act on the valve in a direction opposite the spring bias so as to open the inlet and outlet to the discharge passage upon a predetermined increase in pressure.

Abstract: The invention relates to an adjustable axial piston engine having spaced apart end walls with a shaft extending between the end walls. A rotary carrier is attached to the shaft adjacent one of the end walls and an oblique adjusting plate is mounted adjacent the other end wall. A piston-cylinder unit extends between the carrier and the oblique plate. A pivot axis for the oblique plate includes a bearing arrangement between the plate and the adjacent end wall. A servo unit for adjustably rotating the plate about the pivot axis is provided between the plate and the adjacent end wall. The piston-cylinder unit is carried by the carrier and is slidably engageable with the oblique plate. Flanges are provided for the piston-cylinder units which are spring biased into engagement with the oblique plate via a spring biased pressure plate.

Abstract: The invention relates to hydrostatic steering control apparatus of the type having a hydrostatic steering motor which is connected to wheels to be steered and a steering wheel controlled metering or quantity setting device for controlling the hydraulic fluid supplied to the steering motor. A hydraulic amplifier connected to the steering motor has the characteristics of generating and transmitting undesired pressure pulses to the steering motor during steering switching operations. One way pre-stressed check valves are disposed respectively between the quantity setting apparatus motor ports and the steering motor ports. The check valves open in the direction of the steering motor ports and operate to allow bypassing the amplifier during the steering switching operations.

Abstract: A heating oil pump which is intended for selective single or double line operation. Between the suction side and return side there is a connecting passage which, for double line operation, is closable by a closure member. The latter is displaceable upon insertion of a plug from a closed to an open position by an actuating element which projects into the inserting path of the plug and, upon removal of the plug, back to the closed position by a return spring. This results in automatic change-over without the need for the return pressure to be higher than the suction pressure.