Abstract: A piston for an internal combustion engine has a sliding shoe carried in a force accumulator. The sliding shoe has a channel to transfer cooling oil into a hollow space. The force accumulator is located is a channel formed by the piston, and the sliding shoe is guided partially inside the force accumulator.

Abstract: A method and a device for compressing a gas-phase medium, particularly hydrogen or natural gas, in a single-stage or multistage process using at least one piston compressor, wherein the medium may have a water content up to total saturation with water. The medium to be compressed is heated before the compression at least to such point that the water is unable to condense out during the compression process, and the compressed medium undergoes a water separation process.

Abstract: Actuator assemblies comprise an actuator element and two piezoelectric assemblies, with the two piezoelectric assemblies being configured and arranged for controlling movement of the actuator element. In some example implementations, the first piezoelectric assembly and the second piezoelectric assembly are constructed and arranged so that a temperature dependency of the first piezoelectric assembly is cancelled by the temperature dependency of the second piezoelectric assembly. In a first example embodiment, a first piezoelectric assembly comprises a first or main piezoelectric diaphragm connected to the actuator element for displacing the actuator element in response to displacement of the first piezoelectric diaphragm. The first piezoelectric diaphragm and the second piezoelectric diaphragm are fixedly mounted to a movable carriage.

Abstract: The invention relates to a built-up piston, comprising central screwing and a central cooling chamber. The aim of the invention is to reduce the flow resistance in the oil delivery area. To this end, means for transferring oil from the piston rod to the central cooling chamber are provided in the area of the screw head of the central screw connection.

Abstract: The invention relates to an arrangement in a pump block. The pump block includes a plurality of pump valves each connected to a piston in a piston pump. The pump block also includes an inlet pipe which is common to all of the pump valves. The inlet pipe has a connection to each pump valve. One connection between the inlet pipe and the pump block is fixed and includes a flange fixedly screwed in the pump block, the remaining connections are movable in the longitudinal direction of the inlet pipe. The movable connections each include a flange with over-dimensioned boltholes in which a spacer is placed.

Abstract: The present invention relates to the supply of hydraulic actuation and cooling fluid to the roller actuation pistons and rollers provided in an IVT. The IVT assembly (10) includes a split casing (12a, 12b) and a manifold (28) that comprises one or more channels (30,32,60) formed in a surface of the casing formed by said split. The provision of said manifold in this position allows for easier manufacture and better performance.

Abstract: A cylinder tube is formed in an integrated manner on a base with a support rib intervening therebetween. A slider is displaced in accordance with a displacement action of a piston which is slidable in the cylinder tube. Since the cylinder tube is supported by the support rib, there is no fear of warpage even when the cylinder tube is lengthy. Therefore, the displacement range of the slider is enlarged.

Abstract: A measuring gas pump (1) has a pump chamber (3) closed by means of a working diaphragm (6). The strokes (double-headed arrow 26) are imparted to the working diaphragm (6) by way of a connecting rod or like lifting mechanism (9) from a crank mechanism (10). A heat source (16) is provided in the pump head (15). Provided between the connecting rod head (8) and the crank mechanism (10), there is a heat dissipation barrier (19 and/or 27) with respect to the measuring gas. By means of the measuring gas pump (1), the gas to be delivered thereby can be kept better to the temperature of the gas sampling condition and unwanted condensation of constituents of the gas to be analyzed and falsifications of the measurement result can be avoided or at least significantly reduced.

Abstract: Chemical pumps are disclosed in which all parts wetted by the fluid being pumped are made of fluoroplastic material, with the pumps having check valves that include floating ball members and O-rings positioned adjacent to the floating ball members. The retainer area in which the O-ring is received has a diameter that is at least about 0.01 inch larger that the diameter of the O-ring so as to allow the O-ring to move slightly. The intake and discharge ports of the pumps comprise a bore extending into the body of the pump, with a threaded counterbore formed concentric with the bore to form a flat, annular surface between the bore and the counterbore at the inner end of the counterbore. A threaded fitting is received in the counterbore, and a seal is formed by compressing an O-ring against the annular surface at the inner end of the counterbore.

Abstract: A method for locking a hydraulic actuator in a predetermined position and a locking hydraulic actuator are provided. The method includes the steps of supplying hydraulic fluid to a forward chamber in the hydraulic actuator, transferring the hydraulic fluid from the forward chamber into a forward moiety of the rearward chamber in the hydraulic actuator, and sealing the hydraulic fluid in the forward moiety of the rearward chamber to accomplish the locking function. Conversely, the actuator lock is released by the application of fluid supply pressure to the rearward variable chamber.

Abstract: A hydraulic master and slave cylinder assembly of the type in which a piston is positioned in the master cylinder, a piston rod is connected to the piston and extends out of the input end of the master cylinder, a piston is positioned in the slave cylinder, a piston rod is connected to the slave cylinder piston and extends out of the output end of the slave cylinder, a first conduit extends between the output end of the master cylinder and the input end of the slave cylinder, and a second conduit extends between the input end of the master cylinder and the output end of the slave cylinder.

Abstract: Deposits and corrosion are to be avoided in a heatable diaphragm pump for smoke gases which are to be analyzed. A heatable pump head comprises a diaphragm chamber which is closed by a diaphragm. The diaphragm is driven by a motor through a connecting rod. The connecting rod is heated by controlled heating means and a temperature sensor. Transmission of measuring signals from the temperature sensor to a controller and the power supply to the heating means is permitted through U-shaped leaf springs.

Abstract: In a hydraulic positioning device a piston divides the cavity within a cylinder into two working chambers. The piston is connected with a piston rod passing through one end of the device and with a volume compensating rod through the other end of the device. The piston rod is provided with a passage which can be opened and closed by a valve so as to allow optional adjustment and blocking of the piston rod. The hydraulic liquid within the working chambers is subjected to volume variation in response to varying temperatures. With the aim of compensating such volume variations a partition at one end of the cylinder is supported by an abutment of the cylinder through an axially deformable compensating body having preferably a deformation force--deformation path characteristic which is responsive to temperature.

Abstract: A gas pressure actuator for effecting the reciprocation of the stem of a valve subject to high-pressure loading comprises a tubular housing secured to the valve bonnet and defining a main cylinder chamber connected in axially series relationship with an auxiliary piston chamber which, in turn, communicates with a secondary fluid pressure chamber containing a compressible spring. A rod-like actuator is slidably and sealably mounted within the actuator housing and carries a main piston which cooperates with the main cylinder chamber in sliding and sealable relationship. The auxiliary piston chamber slidably and sealably mounts an auxiliary piston which is movable independently of the main piston. The actuating movement of the main piston produced by the introduction of gas pressure into the main cylinder produces an axial movement of the actuating rod and a compression of the spring. The spring-containing secondary chamber defined by the actuator housing is filled with a virtually non-compressible fluid.

Abstract: In a plunger for a cold chamber casting machine a mouth piece is positioned and held by only three small holding elements equally spaced in peripheral direction and fastened at plunger components. A cooling liquid pipe extends into the plunger. Between the front wall and the back wall of the plunger and the mouth piece, endside flow chambers are formed respectively communicating with the annular flow chamber formed between the plunger casing and the mouth piece along the whole circumference. Therefore the inside faces of the plunger end walls are completely accessible to cooling liquid and the plunger end walls are effectively cooled.

Abstract: An internal combustion engine cylinder liner adapted to have a piston move reciprocally therewithin, the cylinder liner including an exhaust port, an exhaust port bridge extending across the exhaust port, and a relief hole in the cylinder liner positioned at one end of the exhaust port bridge for allowing the exhaust port bridge to expand in a direction other than toward the path of piston movement.

Abstract: In the illustrative embodiments of the invention disclosed, the extension rce of a gas spring is controlled as a function of temperature by varying the volume of the working chamber entered by the piston rod, and thus the gas pressure within the working chamber, as a function of temperature.

Abstract: A pressure receiving element for receiving an external pressure is attached to one end of a body and a temperature compensating diaphragm is attached to the other end of the body. A coupling shaft disposed in the body is fixed at both ends to the pressure receiving element and the diaphragm, respectively. A liquid is sealed in the body and means is provided for detecting displacement or force applied to the coupling shaft in accordance with a pressure received by the pressure receiving element. The diaphragm has corrugations of concentric circles and the crests of a plurality of them are made flat and one of the flat crests is fixed to the body. The effective area of the diaphragm inside of the flat crest that is fixed to the body is selected substantially to be equal to the effective area of the pressure receiving element.

Abstract: A pressure to current transmitter has an internal fill fluid chamber separated from a process fluid by a diaphragm and backup plate. A fluid-tight seal is achieved between the backup plate and the wall of the fluid chamber by a continuous weld bead while the wall of the chamber is arranged on a flexible cantilever to accommodate differential thermal expansion between the backup plate and the chamber wall.

Abstract: A fluid capacitor for liquid use is described comprising a cylinder-pistopring arrangement where the spring constant is made to vary as the viscosity of a fluid, so that a temperature independent RC time constant can be achieved in the systems forced to operate at constant Reynolds number. In one embodiment of the invention a piston containing chamber is allowed to fill with fluid. The pressure of fluid on the movable piston is transmitted in the form of a normal force acting upon a beam which is rigidly supported at both ends, the beam consisting of a flexible material having a high thermal expansion coefficient and being supported by a rigid frame having a low thermal expansion coefficient such that the deflection of the beam is a function of both temperature as well as the applied force.

Abstract: The invention relates to a gas pressure measuring apparatus having a gas-filled tank whose tank gas pressure acts from one side via an aperture in the tank wall on a movable part, more particularly a drop or column of liquid in a capillary, tube or the like, or a diaphragm closing the tank aperture or an aperture in an adjoining chamber having an indicating device, while the other side of the movable part or diaphragm can be acted upon by the gas to be measured with the lines of the gas tank provided with members having different rates of expansion upon temperature changes to provide compensation therefor.

Abstract: A sensor particularly well suited for use in the monitoring of hydraulic pressure. The sensor includes a deformable membrane mechanically coupled to an electrical switch. The membrane is mounted within a chamber in a manner which permits free radial displacement of the edge of the membrane and which also permits the axial position and shape of the membrane to be varied during assembly of the device.