Abstract: A method and a device for detecting flash gas in a vapour-compression refrigeration or heat pump system comprising a compressor, a condenser, an expansion device, and an evaporator interconnected by conduits providing a flow path for a refrigerant, by determining a first rate of heat flow of a heat exchange fluid flow across a heat exchanger of the system and a second rate of heat flow of the refrigerant across the heat exchanger, and using the rates of heat flow for establishing an energy balance from which a parameter for monitoring the refrigerant flow is derived, to thereby provide early detection of flash gas with a minimum number of false alarms.

Abstract: An infusion device for continuously infusion of medication is disclosed, in which infusion is controlled over two separate fluid communications. The infusion is in each fluid communication controlled by restricting means and valve means, and one of the fluid communications further contains a holding device for bolus rate of infusion for a short period. The device comprises a flow regulating device comprising a passage defined by at least a first element and a second element, wherein at least one of the first and second element is a primary deformable element adapted to be elastically deformed so as to change the cross sectional area of the passage. Furthermore the device comprises a container for storage and supply of a medication in fluid form, said container comprising a first and a second chamber being arranged relatively to each other so that when volume of the first chamber increases the volume of the second chamber decreases.

Abstract: A refrigerant valve arrangement is described, having a housing which has a first functional space, in which there is arranged at least one functional element, which co-operates with a first annular contact surface formed in an internal boundary wall. It is desirable to be able to match a refrigerant valve arrangement to different functions with little outlay. For that purpose there is provided, arranged on that side of the boundary wall which is located opposite the first functional space, a second functional space, in which a second functional element can be positioned and which has a second annular contact surface, a channel which passes through the boundary wall opening out in both contact surfaces.

Abstract: A method is provided for the determination of the concentration of compounds in body tissue and fluids. The method utilises two compartments containing reference solutions, which are separated from the sample by two different semi-permeable membranes, in a serial manner, whereby a difference in osmotic pressure occurs in the two compartments due to compounds, which can permeate one of the membranes, but not the other. The difference in osmotic pressure reflects the concentration of these compounds. The method is especially suited for analysis of the concentration of glucose in blood or tissue of diabetic patients, where a device is implanted underneath the skin of the patient and where the method is carried out by using the implanted device.

Abstract: Disclosed herein is a flow cell having an endless loop manifold. The flow cell includes at least two inlet channels. The inlet channels are each connectable with a reservoir and controllable by means of valves. The inlet channels end in an inlet chamber. Each of two ends of the inlet chamber is connected with a discharge channel by means of outlet channels. Old fluid remaining in the inlet chamber is displaced into the discharge channel by newly supplied fluid. Dead time waiting until the old fluid has been displaced by the pure new fluid is minimal.

Abstract: The present invention relates to an electronic ignition circuit for oil burners, in particular a high voltage high frequency ignition circuit, said circuit comprising an oscillator and a high frequency high voltage transformer wound on a core. The core on which the high frequency transformer is wound forms a substantially closed magnetic path for the magnetic flux generated by the windings of the transformer, when current flows through the windings.

Abstract: A controller for an expansion valve of a refrigeration system for cooling a medium is configured to include, in the generation of a control signal, a measure of the evaporation temperature (T0) of the refrigerant in an evaporator and a measure of a property of the cooled medium, preferably without influence from a measure of the superheat temperature (SH) of the refrigerant. The controller comprises a PI-element for integrating and for producing a control signal for the expansion valve for controlling the flow of refrigerant into the evaporator, the PI-element being arranged in an inner control loop, a reference for which is produced by an outer control loop. The controller allows for fast response to disturbances and/or fast response of the medium temperature when the operating conditions of the refrigeration system are changed and/or fast response during start-up of the refrigeration system and maintains stable operation conditions with low, but positive superheating and a stable evaporation pressure.

Abstract: The invention concerns a fail-safe valve having a valve element, and a control motor being connected with the valve element via a driveline. It is endeavoured to ensure the tightness of the refrigeration system in a simple manner. For this purpose, it is ensured that the valve element is located inside and the control motor outside a closed valve housing, that the drive line has a magnetic coupling, which acts through the housing, and that the valve element is pressure-released. In addition, a resetting device is provided that causes the valve element to be returned to a predetermined position upon the undesired cessation of control motor operation.

Abstract: There is described a pressure regulating valve for a refrigerating plant, having a slider member that can be moved relative to a guide by means of a drive device, with variable throttle resistance being created between the guide and the slider member. The purpose of such a valve is to be able to control refrigerant over a relatively large throughput range, and the valve should be able to be manufactured inexpensively. For that purpose, the slider member and the guide co-operate in two sections of their movement relative to one another according to different valve principles.

Abstract: The invention concerns a cooling ceiling installation with at least one heat exchanger, a valve (3), which controls the flow of a heat transfer medium through the heat exchanger and a mechanical control device (4), and a monitoring device (6).

Abstract: The invention concerns a fully hydraulic steering with a steering member, a steering unit that can be activated by the steering member, said steering unit comprising a supply connection arrangement (P, T) with a pressure connection (P) and a tank connection (T), and a working connection arrangement (L, R) with two working connections (L, R), and a steering motor, which is connected with the working connection arrangement (L, R). It is endeavoured to increase the possibilities of steering. For this purpose, it is ensured that an auxiliary force operated steering valve is arranged in parallel to the steering unit between the supply connection arrangement (P, T) and the working connection arrangement (L, R).

Abstract: The invention concerns a water purification device with a fluid pump, a diaphragm unit having a diaphragm, which separates a primary side from a secondary side, and a consumer having a pressure requirement, the fluid pump being connected with the primary side and the consumer being connected with the secondary side. It is endeavoured to supply the consumer with water under a high pressure. For this purpose, the fluid pump supplies the pressure (P2) for the consumer through the diaphragm.

Abstract: A clamp for connecting a cylindrical temperature sensor axis-parallel with a tube has a bendable metallic tension band which tension band on its one end portion has a first jaw and at its other end section is shapewise connectable with a second jaw, and which clamp also has a tension screw. The tension screw is inserted through a bore in the first jaw and is threaded through a threaded bore in the second jaw. To be able to connect the sensor and tube rigidly with little heat transfer resistance the second jaw has a bent plate with two legs. The first leg is provided with the threaded bore and the second leg with a slot through which the other end section can be passed. The tension band length is so chosen that the other end section after the wrapping of the tension band around the temperature sensor and the tube as well as its being passed through the slot is bendable down onto the second leg. The tension screw length is so chosen that after its tightening it lies on the bent down end section.

Abstract: A nozzle, especially an atomizing nozzle for an oil burner, has a housing with a nozzle opening, and a distributing insert which from the interior of the housing lies on the housing in the area of the nozzle opening and is held in the housing with the help of a deformed housing section. To better assure the functioning of the nozzle an elastically deformable element is arranged between the housing section and the distributing insert.

Abstract: An axial valve has a housing, an inlet, an outlet, a valve seat between the inlet and the outlet, and a valve element cooperating with the valve seat, and is controlled by a pilot valve arranged between the inlet and the outlet, with the valve element being moveable parallel to a flow path from the inlet to the outlet and surrounding an interior space. Without changing the external measurements of the valve an increased through flow is achieved in that a first section of the flow path leads through the interior space and a pressure space is arranged between the housing and the valve element, in which pressure space in the closed condition of the pilot valve a closing pressure is formed and applied to the valve element.

Abstract: A controller for an expansion valve of a refrigeration system for cooling a medium is configured to include, in the generation of a control signal, a measure of the evaporation temperature (T0) of the refrigerant in an evaporator and a measure of a property of the cooled medium, preferably without influence from a measure of the superheat temperature (SH) of the refrigerant. The controller comprises a PI-element for integrating and for producing a control signal for the expansion valve for controlling the flow of refrigerant into the evaporator, the PI-element being arranged in an inner control loop, a reference for which is produced by an outer control loop. The controller allows for fast response to disturbances and/or fast response of the medium temperature when the operating conditions of the refrigeration system are changed and/or fast response during start-up of the refrigeration system and maintains stable operation conditions with low, but positive superheating and a stable evaporation pressure.

Abstract: The invention concerns a valve, particularly a solenoid valve, with an inlet connection and an outlet connection, having between them a shut-off device with a valve seat and a closure member. In such a valve, it is endeavoured to obtain a small output with a simple design. For this purpose, the closure member has a closing element and a tappet separate from the closing element, the closing element being held in a guiding arrangement.

Abstract: A method for testing a heating system with at least one basic unit, which controls activating elements of individual heating circuits, with the basic unit being connected with setting units. To simplify the testing of such heating systems, the elements available in the heating system are arranged hierarchically in steps, with the steps being tested in a predetermined order, one after the other.

Abstract: In an expansion valve a valve body combines an inlet and outlet in an orifice in fluid communication therewith. A closure is positioned in the valve body and is movable between an opened and closed position to allow or prevent fluid to flow through the orifice from the inlet to the outlet. The valve body defines a bypass flow path which is in fluid communication with the outlet and inlet to allow fluid to flow from the outlet to the inlet, a bypass closure positioned in the bypass flow path is movable between an opened position and a closed position so that when said closures in said closed position fluid flowing from said outlet towards an inlet causes a bypass closure to move toward said opened position allowing fluid to flow on a reverse direction from the outlet to the inlet. When the closure moves toward the opened position fluid pressure maintains the bypass closure in the dosed position allowing fluid to flow from the inlet to the outlet. The bypass closure is free floating within the valve body.

Abstract: In a method for measuring flow by means of an ultra sonic flow meter, an ultra sonic signal is transmitted in an upstream and a downstream direction. This is measured upon receipt of an ultra sonic signal and the measurement stopped at a stopping point. A first series of transmissions is made, and the starting time of each transmission is incremented or decremented until a time difference between the upstream and downstream signal is inside a reference band. Flow is then calculated in accordance with the time measurements.