Abstract: The apparatus functions for monitoring small leakages in order to activate an alarm in the event that there has been more than a predetermined volume of small leakage through the water taps or other part of the system and to automatically turn off a main valve if flow continues therethrough more than a predetermined time and will allow the main valve to open if the discharge of fluid is temporary stopped. The system includes a main valve having a valve seat and a shunt circuit that bridges the valve seat. The shunt circuit includes a volume flow meter and a shunt valve for blocking fluid flow through the circuit. The main valve opens only when the volume in the shunt path exceeds a predetermined value. The shunt circuit includes a throttle that when fluid flows therethrough, provides a pressure drop in the shunt circuit which results in the main valve diaphragm opening when the shunt circuit predetermined value is exceeded.

Abstract: The method and apparatus is directed to monitoring a fluid conduit system for leaks, particularly a leakage flow of less than 25 liters per hour. After closing a main valve that fluidly connects a fluid source to the conduit system, the time is measured for the pressure in the conduit system to drop to a predetermined first value. Upon reaching the first value a shunt valve is opened and the time is measured for the pressure to rise to a second predetermined value. The leakage flow is calculated from the two measured times and the two pressures together with known constants for the control system. In place of providing the shunt valve the main valve may be partially opened. Controls for the valves are provided together with evaluating apparatus for determining the leakage volume.

Abstract: The invention relates to a protective circuit for the induction coil of a magnetically inductive type flow meter. If the leads of a flow meter used in an explosive environment are cut there can occur a high voltage and resulting sparking which could cause an explosion. The invention provides a circuit in which a short circuit path is provided for the induction coil if the leads thereof are severed to prevent the development of a high voltage which could cause dangerous sparking.

Abstract: The apparatus includes a steeped axially displaceable piston in a stepped cylinder housing, and a rotary shaft is axial fixed relative to the housing and extends into the piston reduced diameter end portion. The piston reduced diameter portion and the housing having a cooperating set of first teeth while the piston and shaft have a cooperating set of second teeth whereby at least one set of the teeth serve to convert axial movement of the piston into rotary motion of the shaft. The shaft is supported in the housing adjacent where it exits from the housing by a first bearing while a second bearing is provide radial adjacent to the juncture of the housing enlarged and reduced diameter portions that supports the interior end portion of the shaft in the piston reduced diameter portion. A third radial bearing is provided between the enlarged diametric portion and the piston enlarged diametric portion in axial remote relationship to the first bearing.

Abstract: The temperature sensitive apparatus controls fluid flow from one line to others and includes an elongated wire of a shaped memory wire that changes in length with changes in temperature extended into a valve housing for pivotally moving valve mechanism in the valve housing against the action of a spring from a fluid flow blocking position to a position permitting fluid flow upon heating the wire. The wire is connected to the valve mechanism and extends through a tube, both of which extend exterior of the valve housing with the major portion of the length of the wire being exterior thereof. The tube extends into a connecting member housing that is attached to the exterior of the valve housing and contains mechanism surrounding the tube to heat the wire. The tube is substantially thermally insulated from the interior of the valve housing. The heating mechanism may include a generator for an electric alternating field to induce a heating current in the wire, or an A.C.

Abstract: In a flow meter that works on the Coriolis principle there is provided a single tube that is bent to have two measuring loops. Upper and lower tube attachment end portions are respectively connected through resilient tubular portions to the opposite ends of the two loops and may be part of the single tube. The loops are superposed and from the juncture of the loops and through at least parts of the attachment end portions are of a continuous downward gradient such that the fluid column in the flow meter will divide and drain through the attachment end portions. Two blocks have tube holder portions for retaining the loop first ends and the measuring loops opposite ends in vertical spaced relationship and connecting the attachment end portions together. The measuring loops are oscilatable in opposite directions while sensors are provided adjacent to the measuring loops for measuring the relative movement of the loops relative to one another to provide a measurement of the fluid flow through the loops.

Abstract: In a flow meter that works on the Coriolis principle there is provided a single tube that is bent to have two measuring loops and a single tube section that connects the adjacent ends of the measuring loops. Tubular attachment end portions are respectively connected through resilient tubular portions to the opposite ends of the two loops and may be part of the single tube. Two blocks have tube holder portions for having the tubular section and the measuring loops opposite ends adjacent their juncture to the resilient portions and the attachment portions adjacent their juncture to the resilient portions respectively extended therethrough. The measuring loops are oscilatable in the opposite direction while sensors are provided adjacent to the measuring loops for measuring the relative movement of the loops relative to one another to provide a measurement of the fluid flow through the loops.

Abstract: The moulding tool has an annular die providing a moulding cavity, an inner ring abutting against the die outer peripheral surface and an outer ring abutting against the inner ring outer peripheral surface. The inner ring is made of a material having a higher modulus of elasticity than the material from which the outer ring and die are made. Advantageously the inner ring is made of a carbide metal and the die and outer ring of steel and in the above described relationship to reduce the danger of fracture of the die.

Abstract: The refrigeration or heat pump installation includes a liquid separator that has a vapor chamber having a port connected to the outlet of the evaporator and an outlet connected through a suction conduit to a compressor. The separator also has an intermediate chamber beneath the vapor chamber for receiving liquid from the vapor chamber by the way of a first switching valve, the intermediate chamber being connected to the inlet of the evaporator for the purpose of recirculating liquid. A second switching valve forms part of the expansion apparatus for controlling the flow of fluid either directly to the intermediate chamber or through the first switching valve to the intermediate chamber. The two switching valves are operated to open and closed conditions in the opposite sense for controlling and almost continuous pulsating recirculation of liquid through the evaporator. The expansion apparatus is connected through a condenser to the outlet of the compressor.

Abstract: Disclosed is a valve that is particularly useful in a pressure atomizing nozzle of a heating installation and includes a valve housing in which there is a valve seat with an adjoining valve chamber and a flow passage that opens to a housing outlet. In the valve chamber there is provided a spring for resiliently urging the closure member to seat on the valve seat. The valve chamber has a guide section adjacent the valve seat that is of a transverse cross section corresponding to a transverse cross section of the closure member while the housing and closure member provide a free flow passage to the outlet when the closure member is moved axially away from the valve seat at least a preselected axial distance. The valve is of a construction that ensures that fluid can flow through the valve only after a particular desire pressure has been reached, but immediately after the conveying pressure drops below a predetermined value, fluid can no longer reach the housing outlet.

Abstract: There is provided control apparatus for controlling fluid flow between a bidirectional motor, a pump and a container, and includes a control valve that has a slide operative between neutral and first and second operative positions. A compensating valve is provided in the supply conduit that holds the upstream pressure drop at the control valve substantially constant and is controlled by load pressure sensing circuitry. The load pressure circuitry includes two branches that are connected through a change over valve to the compensating valve. There is provided an over pressure valve and a throttle point in each branch, each branch being connected to a load pressure sensing orifice of the control valve housing and fluidly connected through the slide to one of the housing motor orifices, the one depending upon whether the slide is in its first or in its second position.

Abstract: A method for controlling the speed of an object which is moveable by a drive and is intended to have reached a predetermined speed after the occurrence of a release signal at a predetermined location. Also a circuit for performing this method including a permanently running drive, an object to be driven, releasable clutch-brake unit between the drive and object and a position sensor. The clutch-brake unit is being brought into clutch or brake engagement depending on a release signal from the position sensor.

Abstract: A water outlet fitting has a housing that includes first and second housing portions with a water outlet passage opening to the water inlet passage at an angle with a sound damper insert extended into part of the outlet passage in the first housing portion. The insert includes a sealing member removable clamped between the housing portions and is connected through a filter to a base located in the closed terminal end portion of the outlet passage axially opposite the opening of the inlet passage to the outlet passage from the sealing member. A generally conical, resilient body has its axially lower end mounted to the base and surround by the filter to form a generally conical air cushion opening to the closed terminal end of the outlet passage and be removable from the outlet passage with the removal of the sealing element.

Abstract: A servomotor is actuated by a pressure medium and has a piston reciprocated in the cylinder, the piston being mounted by a piston rod that extends through a cylinder end wall. The piston has a piston member bearing against the cylinder and is mounted for radial movement relative to the piston rod by a pair of piston guide plates that extend on opposite sides of the piston member. The guide plates are mounted by the piston rod for axial movement therewith.

Abstract: A hydraulic control valve and sensing mechanism for controlling flow between a motor and a pump and container that includes a slide mounted in a housing bore for movement between a neutral position and two operative position. The slide has a central collar separated from end collars by slide grooves, profilings on diametric opposite sides of the slide grooves intersecting each groove. The housing bore has a pump groove supplied with pressure medium, axially opposite motor grooves connectable to motor conduits, and axially opposite the motor grooves from the pump grooves there are container grooves connectable to the container. The pressure sensing mechanism includes at least one pressure sensing orifice that is connected to the pressure to be sensed in an operative position of the slide but not being fluidly connected thereto when the slide is in its neutral position.

Abstract: A hydraulic safety brake valve arrangement for a motor controlled by a directional control valve. The safety brake valve arrangement has a main valve closing the load lowering conduit in a rest position. Pump pressure opens the main valve to throttle exhausted fluid and at the same time throttle fluid through the supply conduit to the opposed motor chamber. A compensating valve is placed in series with the main valve throttle for the loaded side of the motor. Motor speed is thereby controlled independent of the external loading on the motor.

Abstract: The invention relates to a magnetically inductive flow meter which generates a combined signal made up of a coil generated alternating voltage and an alternating simulated voltage. An evaluating circuit processes the combined signal to determine a flow rate output value in a manner which minimizes the temperature and time drift influences on the components of the flow meter.

Abstract: Clutch and brake apparatus that is operable by a compressible fluid, particularly pneumatically, includes input and output shafts mounted in a common housing that has a clutch chamber. A clutch plate and a clutch flange are mounted in the clutch chamber with the flange being fixed to the input shaft and the clutch plate dividing the clutch chamber into two operating chambers that are adapted to be at different fluid pressures. A friction lining is fixed to at least one of the clutch plate and clutch flange for engaging the other. A clutch plate is mounted to be axially displacable relative to the output shaft in every load condition while at least one torque plate is fixed to rotate with the output shaft and a peripheral portion of the clutch plate. The torque plate is subjected to the same fluid pressure on both sides. The apparatus is able to operated with a large pressure differences across the clutch plate without danger of damaging the clutch plate.

Abstract: The refrigeration plant disclosed herein includes an evaporator, a compressor connected to the outlet of the evaporator, a condenser connected to the outlet of the compressor, a controllable expansion valve connected to the outlet of the condenser and having its outlet connected to the evaporator and condenser pressure controls for providing at the least possible condenser pressure, the degree of opening of the expansion valve to obtain an optimum ratio between the condenser pressure and the evaporator evaporator performance. That is, the degree of opening of the expansion valve lies in a range giving the least possible condenser pressure.

Abstract: In order to prevent kick-back at the steering element that controls a fluid steering motor, there is provided hydrostatic steering apparatus that includes a control device connected between a priority valve and the steering motor. A load pressure conduit connects an outlet of the priority valve to a junction of the control device. The priority valve includes a tapping at which there is provided fluid pressure for moving priority valve slide, two pressure distributing throttles being connected to the tapping. A check valve that opens toward the junction is provided in the load pressure conduit between one of the distributing valves and the junction. Another check valve that opens toward the junction is fluidly connected in series with a control device supply throttle between the junction and the priority valve outlet, the supply throttle and junction being in a fluid line that supplies pressurized fluid to the steering motor.