Abstract: A cover for a housed thermostat having a thermostat valve which is held on the cover, forms a main valve and a short-circuit valve and contains a thermostatic working element whose housing is connected with the main valve disk. The cover has a projection which surrounds the housing of the working element in a cage-type manner and is molded to the main valve disk which is manufactured as a molded plastic part. The end of the projection projects over the housing of the working element and forms part of the short-circuit valve.

Abstract: In a piezoelectric valve the actual control member (7) is formed by a displacer fluid motor (9) though which the fluid stream (5) flows. A piezoelectric actuating element (8) is disposed in the region of a displacer element (1), which can be moved by the fluid stream (5) and belongs to this fluid motor (9), and acts exploiting the inverse piezo effect during electric actuation to at least indirectly block or release this displacer element (1). The fluid motor (9) is formed preferably by a rotating piston machine, such as a gear pump.

Abstract: Method for the continuous control of the delivery rate of reciprocating compressors by occasional holding-open of the suction valves by a lifting device (8), which is actuated by a lifting force supplied by a pressure medium. In order to take into consideration the properties of the gas delivered and to adapt the control method in a corresponding manner, the magnitude of the lifting force is chosen depending on the drive power respectively received by the drive motor (11) of the compressor (3). The lifting force may be limited depending on the drive power. An apparatus for carrying out the method includes a compressor system (3), which includes at least one cylinder (4-7) with a lifting device (8) for the suction valve, which is actuated by a lifting force applied by a pressure medium, the magnitude of which can be determined by a controller (10). The drive power received by the drive motor (11) of the compressor (3) is supplied to the controller (10) as a signal.

Abstract: In the case of a thermostatic valve for a coolant control of an internal-combustion engine, it is provided that a connecting element is provided which is made of a material having a low thermal conductivity so that a thermal uncoupling takes place between the valve housing part of the thermostatic valve and a thermostatic valve element which is mounted on it and is to be arranged outside the coolant flow.

Abstract: The valve, which is intended especially for compressors, comprises a valve seat (1) with passage channels (2), a catcher (3), and at least one sealing element (5), which is arranged in the intermediate space between the valve seat (1) and the catcher (3). The passage channels (2) of the valve seat (1) are controlled by sealing rings (10), which project into their assigned passage channel (2) with one part of their profile when the valve is closed. The sealing surfaces (13), against which the sealing rings (10) abut when the valve is closed, extend at oblique angles to the direction of the lifting movement of the sealing rings (10). To ensure that the valve is sealed even when the sealing rings (10) in their dimensions do not fit accurately with respect to the valve seat (1) and to its sealing surfaces (13), e.g.

Abstract: A compressor plate valve has a valve seat (1) with flow passages (6), a valve guard and a valve plate (7) formed from concentric rings (16, 17) joined together by radial webs (18). In order to damp the valve plate (7), and in particular to lessen its impact both on opening and on closing the valve, and to reduce troublesome adhesion between the plates, the valve plate (10) comprises a closure plate (14) of soft material such as plastics, and a guide plate (15) of hard material such as steel. The two plates have the same outline in plan view and lie firmly against each other, the soft closure plate (14) facing the valve seat (1) and the guide plate (15) facing the valve guard (2). Only the outer ring (16) of the two plates (14, 15) is loaded by springs (13) and is substantially wider than the inner rings (17).

Abstract: A piston-type compressor for gaseous media, e.g. a brake air compressor for automotive vehicles, particularly a compressor having capacity control means, is provided with an externally arranged lubricant pump for supplying the lubricant from a storage reservoir which is positioned below the compressor to a lubrication circuit of the compressor. A downwardly extending return line for the lubricant is provided between the otherwise enclosed crankcase of the compressor and the storage reservoir. In order to prevent a build-up of superatmospheric pressure in the crankcase, a self-acting check valve is installed in the return line the check valve serving to block flow of lubricant through the return duct toward the crankcase of the compressor.

Abstract: A fluid cylinder control method for monitoring the position or controlling the movements of a piston which is slidably guided in a cylinder tube and is acted upon on at least one side by a pressure medium, in particular, maintaining the piston in a predetermined position against the action of eventual disturbance forces. This is attained in that the force which is transmitted between the piston and the cylinder by way of the parts which are slidingly guided on each other, and in particular the friction force acting by way of the seal gaskets of the piston and/or of the rod, is measured and the loading of the piston by a pressure medium is varied in the sense of reducing the measured force.

Abstract: A spring plate for transmitting or storing forces is made of plates of material by punching and has radial webs connected in meander form by peripheral bridges. The radial webs between successive bridges are separated by narrow slots whose width, measured when the spring plate is in the flat state, is at least 10% less than the thickness of the spring-plate material, so that a maximum number of radial webs can be accommodated round the periphery of the spring plate.

Abstract: A disc assembly comprises a plurality of substantially radially spaced spokes joined together by intermediate walls of flexible material. The disc assembly can be used to transmit forces in a force transmission system such as a multiple disc clutch. Such a system comprises a member for applying an input force, a member for receiving an output force, and the inventive annular disc assembly, the disc assembly having force transmission and force application regions at its inner and outer edges and at an intermediate region, the noted members being in engagement with at least some of the force transmission and force application regions.

Abstract: A device for regulating the delivery of rotary compressors, such as screw-type compressors with oil injection, comprises a regulating valve for varying the cross-sectional area of a suction pipe and a non-return valve which closes said suction pipe. The two valves are disposed one behind the other in the flow direction within a casing incorporating a suction pipe. In order to provide a low resistance to flow and to simplify the construction, both valves are in the form of flap valves with the flap of the non-return valve arranged to close a valve seat provided in the casing and being pivotable against a resetting force about an axis extending outside the cross-sectional area of the valve seat.

Abstract: An air-compressing, direct injection internal combustion engine in which the piston is formed with a combustion chamber in the shape of a solid of revolution and a constricted throat opening, and where mixture formation is predominantly by fuel deposition on the walls of the combustion chamber. The function of the internal combustion engine is proposed to be improved so that, by influencing the squish flow occurring as air in inducted into the combustion chamber, improved performance is obtained, especially in the lower and medium speed ranges of the engine. According to the new proposal, this is essentially achieved by forming the throat opening with an oval cross-section, adopting defined fuel jet directions when injecting the fuel, as well as keeping the location of the fuel discharge point within a defined area.

Abstract: A blade valve for a compressor comprises two discs which are arranged one above the other with the interposition of a seal. The discs are provided with ducts for the controlled medium and form both the valve seat and the catcher. In the seal, whose thickness determines the valve stroke, elongate recesses are provided for the blades which control the passage ducts. At the ends of the recesses, stepped stops are provided in the seal for the ends of the strip-like blades which are loosely inserted into the recesses. The stepped stops may be formed by profiled strips which are inserted at the ends of the recesses and which extend transversely to the longitudinal direction of the blades.

Abstract: A piston for internal combustion engines, especially for high-performance internal combustion engines. The piston has several ring grooves for piston rings, and an oil control groove which is provided below the top ring groove, is separated therefrom, and opens only towards the cylinder bore. The land between the topmost ring groove and the oil control groove, seen in cross section, is designed as a support having constant bending stress and has a finite height at its outer surface. The inner confine of the oil control groove has a finite radius or rounded-off section to avoid an increased stress concentration factor.

Abstract: A resonance torsional vibration damper, especially a multi-member vibration damper which includes a primary member including one, preferably a plurality of, fixedly interconnected parts and arranged on a shaft or crankshaft. The damper furthermore includes one or more secondary members arranged adjacent to each other in axial direction but spaced from each other and by means of elastic members connected to the primary member. In the primary part there are provided cooling air openings which lead outwardly and into the region of the secondary members. At the free end face or end faces of one or more secondary members there are provided preferably radially outwardly leading cooling fins.

Abstract: A naturally aspirated eight cylinder internal combustion V-engine in which the cylinders of each bank of cylinders are divided into groups of two cylinders each, and in which the inlet ports of each group pertaining to one and the same cylinder bank are brought together to a joint inlet manifold. Each two cylinders of one and the same group of cylinders have a firing interval which equals or is greater than the opening period of the respective inlet valve pertaining to the respective group of cylinders.

Abstract: A device for controlling oil injection to a screw compressor, the device comprising an oil stop valve having a closing element mounted at one end of a valve stem slidably and sealingly received in a bore connecting the valve with a housing divided by a diaphragm mounted on the other end of the valve stem into two chambers, one chamber being connectable to the compressor output and when pressurized, serving to act on the diaphragm to open the valve, and the other chamber communicating with the valve via an axial bore in the valve stem and when pressurized, serving to act on the diaphragm to close the valve, the valve stem in its portion received in the bore having a cross-sectional area approximately equal to the effective sealing surface area of the closing element.

Abstract: A pressure regulator comprises a regulator valve in a casing between a pressure inlet and a pressure outlet, the valve being controlled by a diaphragm subject to inlet pressure and the regulator including a flow restrictor in a passage between the inlet and the diaphragm.