Abstract: Disclosed herein is an integrated pump system in which a motor is directly coupled to a pump, preferably using a modular connection. The integrated pump system may operate in a uni-directional or bi-directional mode. The integrated pump system incorporates an internal cooling channel which directs the returning low pressure hydraulic fluid past the controller and the motor for cooling purposes. The low pressure hydraulic fluid is also directly fed into the coupling between the motor and the pump to provide both cooling and lubrication.

Abstract: A Scotch yoke actuator includes a housing formed with four piston bores spaced equally 90° from each other, a shaft with four yokes, each of the yokes having a slot, and four pistons including two pairs of 180° opposing pistons, one pair of the opposing pistons being orthogonal to the other pair of the opposing pistons. Each of the pistons is arranged for linear motion in one of the piston bores. Each of the pistons includes a piston rod which includes a piston pin which is slidable in the slot. Linear motion of the pistons in the piston bores causes rotation of the shaft.

Abstract: The invention relates to an orbital pump for pumping a fluid, wherein the pump comprises at least one pump control system, a motor that can be controlled by the pump control system, a rotor shaft (10) for fluid transport, and a rotor sensor for detecting an absolute angle of rotation of the rotor shaft (40), the rotor sensor is connected to the pump control system and designed to transmit the angle of rotation of the rotor shaft (40) to the pump control system, and the pump control system is designed to rotationally control the rotor shaft (40) by means of the motor until the rotor shaft (40) is in a pre-determined angle of rotation position.

Abstract: An inflating device includes an air pump, a valve engaging head, and a pushing apparatus disposed on the air pump and selectively engaging and disengaging the valve engaging head. The valve engaging head includes a main body, a connection assembly coupled to the main body and having a connection hole for a Presta valve and another connection hole for a Schrader valve, and a valve seat movably disposed in the main body. The connection assembly has a receiving hole and the valve seat is movably disposed in the receiving hole. The pushing apparatus selectively contacts and disengages from the connection assembly. The pushing apparatus has a pushing portion adapted to drive the valve seat. The pushing apparatus engaging the valve engaging head includes the pushing portion pushing the first abutting portion, thereby driving the valve seat toward the second connection hole.

Abstract: The subject of the invention is a suction pump having a suction tube and a suction piston for producing a negative pressure in a negative-pressure retaining device, a set consisting of the negative-pressure retaining device and the suction pump, and a method for attaching the negative-pressure retaining device.

Abstract: In a fluid pressure cylinder, cylindrical bodies are connected to both ends of a cylinder tube, and latching rings are disposed detachably in interior of the cylindrical bodies. A head cover and a rod cover, which are accommodated in the cylinder tube, are fixed by the latching rings. Recesses, which are recessed diametrally inward, are provided on outer circumferential surfaces of the head cover and the rod cover, respectively. First and second fluid ports open respectively in the recesses, and a pressure fluid is supplied and discharged through the first and second fluid ports.

Abstract: One aspect includes an isothermal compressor that includes an isothermal body, an isothermal cavity defined by the isothermal body, a compressible membrane heat exchanger disposed within the isothermal cavity that defines at least one first fluid chamber, and an actuating assembly configured to compress the membrane heat exchanger. A further aspect includes an isothermal engine that includes the isothermal compressor.

Abstract: A high efficiency steam engine or steam expander includes a cylinder, cylinder head and piston in which cylinder clearance volume is zero or nearly zero together with a negligible amount of compression such that any pressure in the cylinder clearance volume just before the power stroke is as low as ambient pressure or condenser pressure to provide superior thermal efficiency in a compact compound engine having a high pressure expansion chamber within the piston and low pressure chamber in the cylinder. The inlet valve is opened slightly by piston movement and a steam assist force then drives it to its fully open position. Steam passes from the high pressure chamber to the low pressure chamber through a transfer valve located in the head of the piston and steam is released through an automatic exhaust valve in the cylinder head.

Abstract: High pressure pumps for injecting cement mixtures are provided. Such pumps are configured so that the frequency and costs of servicing are greatly reduced.

Abstract: A compression apparatus in the present invention includes a compressor including a cylinder for compressing a gas, a gas cooler for cooling the gas compressed in the cylinder, and a circulation passage for guiding the gas compressed in the cylinder into the gas cooler. The gas cooler is diffusion bonded to the cylinder. In order to reduce the size of the compression apparatus, the circulation passage extends through an area in which the gas cooler and the cylinder face each other. At least areas surrounding the area are diffusion bonded.

Abstract: A reciprocating cryogenic pump 2 comprises a piston reciprocable within a pumping chamber 44. The pumping chamber 44 has an inlet suction valve 48 for cryogenic liquid to be pumped and an outlet 32 for high pressure cryogenic liquid. The inlet valve 48 for the cryogenic liquid communicates with a cryogenic liquid reception chamber 46 in the cold end or head 6 of the pump 2. The pump head 6 is at least partially surrounded by a first jacket 8 retaining primary vacuum insulation. The first jacket 8 is itself at least partly surrounded by a second jacket 10. The jacket 10 defines a chamber for the reception of a coolant fluid such as liquid nitrogen and the second jacket has an inlet 20 and an outlet 22 for the liquid nitrogen. The thermal insulation can be further enhanced by a trapped gas space 73 between the first jacket 8 and an inner sleeve 52, the latter defining with an outer sleeve 50 vacuum insulation for the pumping chamber 44.

Abstract: A retort sterilization device includes a water steam generation device for generating water steam and a heating pot, connected to the water steam generation device, for accommodating retort food. The water steam generation device includes a heat exchanger for performing heat exchange between liquid flowing in a liquid path and heating vapor flowing in the vapor path. A top end of the liquid path of the heat exchanger is connected via a water steam supply pipe to a water steam ejection section located in an internal area of the heating pot. The heat exchanger is connected to a liquid container. A bottom end of the liquid path of the heat exchanger is connected to the liquid container via a communicating tube. The liquid container is coupled to the heating pot.

Abstract: The invention relates to a cylinder head (1) for a two-stage reciprocating piston compressor, comprising an intercooler (9) that is designed as a cooled overflow channel (14) between the pressure side of the first stage and the suction side of the second stage, wherein the overflow channel (14) has a substantially slot-like cross-section, and the overflow channel (14) is in addition divided by at least one indirectly cooled center rib (15) so that therefrom at least two overflow channel portions (14?) and (14?) are created, wherein the cylinder head (1) has a cylinder head upper part (2) and a cylinder head lower part (3), the cross-section of the indirectly cooled center rib (15) is divided in its longitudinal extent thereby forming a passage gap between the overflow channels (14?) and (14?) that run on both sides, and one portion of the center rib (15) is formed from the cylinder head upper part (2) and the other portion of the center rib (15) is formed from the cylinder head lower part (3).

Abstract: A drive device for a vehicle having an automatic transmission, which has a hydrodynamic torque converter. The transmission oil of the automatic transmission is used as the operating medium for the hydrodynamic torque converter. In addition, the drive device has a heat exchanger for cooling the operating medium. It is provided that additional apparatuses (heat exchangers) are provided for the direct cooling of the hydrodynamic torque converter using a cooling medium.

Abstract: Systems, methods and devices for optimizing heat transfer within a device or system used to compress and/or expand a gas, such as air, are described herein. For example, systems, methods and devices for optimizing the heat transfer within an air compression and expansion energy storage system are described herein. A compressor and/or expander device can include one or more of various embodiments of a heat transfer element that can be disposed within an interior of a cylinder or pressure vessel used in the compression and/or expansion of a gas, such as air. Such devices can include hydraulic and/or pneumatic actuators to move a fluid (e.g., liquid or gas) within the cylinder or pressure vessel. The heat transfer element can be used to remove heat energy generated during a compression and/or expansion process.

Abstract: An activation unit is disclosed having at least one actuator having a variable length disposed around at least one first axis. The activation unit operatively interacts with an activation element mounted so that it can be bi-directionally deflected along a second axis. The front side of the actuator is indirectly or directly engaged with a first piston, which can be deflected along the first axis in a mechanically positively driven manner. The first piston has a front side facing away from the actuator which axially borders at least regions of a transfer medium on one side. The transfer medium is radially surrounded relative to a first axis by a housing radially to the first axis, and axially borders at least regionally a front side of at least one second piston. The at least second piston can be deflected in a mechanically positively driven manner, and engages the activation element directly or indirectly.

Abstract: An air compressor of a pneumatic system in a vehicle includes a piston pump that is fitted with at least one piston and a crankshaft which are located in a crankcase. At least part of the crankcase is cast from aluminum and includes an integrally formed coolant duct.

Abstract: A variable guide vane actuator for positioning the guide vanes of a turbine engine in a hypersonic missile uses compressor exhaust to drive a linked, floating piston assembly that is coupled to the guide vanes. The relatively low pressure compressor exhaust is metered by a valve to drive the piston arrangement to accurately position the guide vanes in proportion to the input control signal. Reliability and accuracy gains are achieved by inhibiting the effects of vibration and thermal distortion through the elimination of piston/bore contact, the use of a rigid, cantilevered mounting arrangement and cooling with the pre-combusted liquid fuel.

Abstract: A water-cooled piston compressor having at least one air-compressing piston, which can be driven with means for producing a linearly oscillating drive force and which is accommodated in an axially movable manner in a cylinder housing which is closed at the end face via a cylinder head and is provided with water-cooling means, wherein the water-cooling means comprise a cylinder housing which is formed with a double wall and on whose end face facing the cylinder head a plurality of cooling openings are arranged, via which coolant flowing through the double-walled cylinder housing comes into contact with the region of the cylinder head.

Abstract: A high-pressure pump includes a plunger for pressurizing a fuel, a cylinder accommodating the plunger reciprocatably in its axial direction and a pump body. The pump body defines a pressurization chamber, a low-pressure fuel passage hydraulically connecting a fuel inlet and the pressurization chamber, and a discharge passage. The pump body further defines a cylindrical space around the cylinder. The fuel flows into the cylindrical space from the low-pressure fuel passage so as to cool the cylinder. The entire outer surface of the cylinder can be surely cooled.

Abstract: A portable electromagnetic power system used as a remote alternate power source includes a water tank having an oil reservoir mounted on top of the tank with four cylinders extending through the tank and the two outer cylinders denoted the pressure cylinders and the two inner cylinders serving as accumulators with electromagnets mounted at the ends of each pressure cylinder for reciprocating an internal floating piston and each inner cylinder having a permanent magnet mounted at one end for actuating a magnetized floating piston disposed therein and each magnetized floating piston dividing the inner cylinder into an air chamber portion and a fluid chamber portion with the oil reservoir and the cylinders all in fluid flow registration with each other and the inner cylinders connected to a working pressure line that connects to a device, such as a hydraulic motor, so that the outer cylinder develop working pressure concomitant with the flow of oil therein that is directed to the inner (accumulator) cylinders fo

Abstract: A heat dissipating system for a hermetic compressor includes a thermal energy transfer duct having a heat absorbing end mounted to the cylinder block of the compressor to absorb the heat generated by the compression of the refrigerant fluid in the cylinder block and a heat releasing end positioned away from the heat absorbing end and away from the cylinder block in order to release the heat conducted from the cylinder block by the transfer duct.

Abstract: A compressed-air energy storage system according to embodiments of the present invention comprises a reversible mechanism to compress and expand air, one or more compressed air storage tanks, a control system, one or more heat exchangers, and, in certain embodiments of the invention, a motor-generator. The reversible air compressor-expander uses mechanical power to compress air (when it is acting as a compressor) and converts the energy stored in compressed air to mechanical power (when it is acting as an expander). In certain embodiments, the compressor-expander comprises one or more stages, each stage consisting of pressure vessel (the “pressure cell”) partially filled with water or other liquid. In some embodiments, the pressure vessel communicates with one or more cylinder devices to exchange air and liquid with the cylinder chamber(s) thereof. Suitable valving allows air to enter and leave the pressure cell and cylinder device, if present, under electronic control.

Abstract: A water-cooled piston compressor having at least one air-compressing piston, which can be driven with means for producing a linearly oscillating drive force and which is accommodated in an axially movable manner in a cylinder housing which is closed at the end face via a cylinder head and is provided with water-cooling means, wherein the water-cooling means comprise a cylinder housing which is formed with a double wall and on whose end face facing the cylinder head a plurality of cooling openings are arranged, via which coolant flowing through the double-walled cylinder housing comes into contact with the region of the cylinder head.

Abstract: A compressor cooling system for an air compressor includes an air compressor including an external surface; an enclosure for enclosing the air compressor inside the enclosure; an air passage formed on the inside of the enclosure between the enclosure and the external surface of the air compressor; multiple holes in the enclosure; and a negative pressure source coupled to the air passage for drawing air through the multiple holes and into the enclosure for cooling the compressor.

Abstract: A reciprocating pump assembly includes piston rod that is movable and reciprocates in order to pump a fluid. The piston rod has a piston portion at an end that stokes within a piston chamber. The pump assembly also includes a piston rod sleeve that houses the piston rod. The piston rod sleeve does not reciprocate with the piston rod. Thus, the piston rod sleeve remains stationary. The piston rod sleeve defines and annulus between the piston rod and the piston rod sleeve. The pump assembly has a fluid line that leads into the annulus. The fluid line delivers coolant to the annulus. The pump assembly also includes a flow passage. The flow passage has an inlet in fluid communication with the annulus for receiving the coolant. The passage also has an outlet in fluid communication with the piston chamber for delivering the coolant.

Abstract: A hydrostatic machine with a cylinder block (6), within which sleeve holes (28b) are arranged, in which sleeves (28) sit, surrounding piston bores (28a) in which pistons (29) are mounted, such as to be displaced back and forth and the pistons (29) extend into the cylinder block (5) such as to define cylinders (26) with the front ends thereof. According to the invention, the risk of piston seizure can be reduced, whereby the sleeves (28) comprise an axially-defined recess (41) in the outer surface thereof, in the region facing away from the cylinder and the region with the greatest piston radial force, pressing the pistons (29) against the wall of the piston bore.

Abstract: A pump for gases to be measured having a pump housing in which a pump chamber is located. The pump chamber is sealed off by a working membrane that is connected to a crank drive by a connecting rod or similar lifting mechanism. A heating device is provided in an upper area of the pump housing, particularly in the pump head. Heat insulation covering at least the pump head is provided. The heat insulation is in the form of an insulating housing having an inner wall spaced apart from the pump head in order to form a gas insulation layer.

Abstract: A reciprocating pump assembly includes piston rod that is movable and reciprocates in order to pump a fluid. The piston rod has a piston portion at an end that stokes within a piston chamber. The pump assembly also includes a piston rod sleeve that houses the piston rod. The piston rod sleeve does not reciprocate with the piston rod. Thus, the piston rod sleeve remains stationary. The piston rod sleeve defines and annulus between the piston rod and the piston rod sleeve. The pump assembly has a fluid line that leads into the annulus. The fluid line delivers coolant to the annulus. The pump assembly also includes a flow passage. The flow passage has an inlet in fluid communication with the annulus for receiving the coolant. The passage also has an outlet in fluid communication with the piston chamber for delivering the coolant.

Abstract: A heat transfer head (10) for a stirling engine is disclosed. The heat transfer head (10) comprises a plurality of external circumferential fins (30) projecting out from the heat transfer head (10). At least two of the adjacent fins (30) are arranged to be substantially parallel and such that some of the radiant heat received by one of the fins is reflected onto the other fin. A second set of fins (40) is provided above the circumferential fins. The second set of fins are arranged to enable combustion gases from a burner to pass upwards therebetween to enable heat to be absorbed from the passing combustion gases.

Abstract: A piston assembly for a compressor that reduces the temperature experienced by a compressor cup seal during operation of the compressor. The piston assembly includes a piston sleeve having a top portion and an interior. A valve plate is supported by the top of the piston sleeve. A compressor head includes a compressor head plate, which is offset from the valve plate. The offset between the compressor head plate and the valve plate defines a cooling chamber. The interior of the piston sleeve communicates with the interior of the compressor head via openings defined in the valve plate and the compressor head plate and conduit associated with these opening and traversing the cooling chamber.

Abstract: A jacket-assembly is sealed to a hydraulic elevator jack to protect the jack from corrosion. The jacket-assembly is preferably manufactured from a non-galvanic, non-corrosive material, such as high density polyethylene tubing. The jacket may be manufactured from any non-galvanic, non-corrosive material that is strong enough and flexible enough to be factory-installed on the jack, i.e., installed on the jack at a location other than the location where the jack is to be installed, and survive shipping and installation of the jack. The jacket is preferably hermetically sealed to the jack. The jacket-assembly may contain a bulkhead mounted on the hydraulic elevator jack having an O-ring groove. An O-ring can be used to effect a hermetic seal between the bulkhead and the jacket. The bulkhead may be mounted on the jack with any conventional means, such as a weld. In one embodiment, a moisture sensor may be placed inside the jacket.

Abstract: An apparatus includes a motor with an output shaft. A solitary air compressor is linked to the output shaft so as to be driven by the output shaft. The compressor contains a piston in a cylinder. A first fan is mounted on the output shaft to direct cooling air to the motor. A second fan is mounted on the output shaft to direct cooling air to the compressor.

Abstract: A piston assembly for a compressor that reduces the temperature experienced by a compressor cup seal during operation of the compressor. The piston assembly includes a piston sleeve having a top portion and an interior. A valve plate is supported by the top of the piston sleeve. A compressor head includes a compressor head plate, which is offset from the valve plate. The offset between the compressor head plate and the valve plate defines a cooling chamber. The interior of the piston sleeve communicates with the interior of the compressor head via openings defined in the valve plate and the compressor head plate and conduit associated with these opening and traversing the cooling chamber.

Abstract: A piston-cylinder assembly has a principal structural group including a cylinder and another principal structural group including a piston rod which has a part-length axially displaceably arranged within the cylinder. The piston rod adopts a default stroke position without external displacement forces acting on the piston-cylinder assembly, the default position being determined by positioning equipment. The positioning equipment includes at least one energy accumulator which acts in the inward and outward movement directions of the piston rod as a function of the stroke position of the piston rod. The at least one energy accumulator includes a tension spring arrangement and a compression spring arrangement.

Abstract: A chuck actuator has a cylinder housing rotatable about a main axis and forming a chamber, a piston axially subdividing the chamber into a pair of compartments and axially displaceable in the chamber, and a stem centered on the axis, extending from the housing, and formed with a pair of passages each having one end opening into a respective one of the compartments and an opposite end opening on the stem offset from the piston. A distributor body is rotatable about the axis on the stem and has connections for feeding fluid under pressure into the opposite ends of the passages for axially displacing the piston in the chamber. The cylinder housing is formed with cooling openings directed at the distributor body.

Abstract: In order to maintain high efficiency close, to isothermy despite high frequencies in a pneumo-hydraulic converter with reciprocating pistons, pipe cluster-heat exchange pipes (38) are provided in the gas working chambers of the converter and the exchange fluid in the pipes is kept at approximately ambient temperature. For this the gas working chambers must be arranged axially next to one another and, in order to eliminate dead space, connected in pairs by conical exchange valves (12a/12b) which take in the entire wall thickness of the valve flange (5a/5b) dividing the air chambers.

Abstract: An axial piston machine having a housing (1) the interior housing chamber of which includes a leakage chamber (37) and accommodates a stroke disc (3) and a rotatably mounted cylinder drum (6) having cylinders (26, 28) and pistons (29) reciprocally movable in the cylinders, the ends of which pistons projecting out of the cylinders (26, 28) bear on the stroke disc (3). In order to avoid piston seizures, while maintaining the efficiency of the axial piston machine, there is provided a cooling circuit.

Abstract: A piston assembly comprising a piston sleeve having an interior wall, a piston carried in the piston sleeve, a cup seal carried by the piston which engages the interior wall of the piston sleeve, and a valve plate matingly adapted to receive the piston sleeve. A firm thermal-insulating barrier is disposed between the valve plate and the piston sleeve for reducing the heat flow from the valve plate to the piston sleeve.

Abstract: A compressor with a cylinder head (33, 29) comprises a lower cylinder head section (33) and an upper cylinder head section (29) connected to each other. A seal (12) is provided between the faces of the lower cylinder head section (33) and the upper cylinder head section (29) facing each other. A suction space (31, 25) and a pressure space (10, 17) as well as a suction valve (32, 4) and a pressure valve (5, 7) are installed in the cylinder head (33, 29). A compression space (3) of the compressor is connected by the suction valve (32, 4) to the suction space (31, 25), and by the pressure valve (5, 7) to the pressure space (10, 17). The suction space (31, 25) is also connected by a suction connection (71) to the atmosphere, and the pressure space (10, 17) is connected to a consumer by a pressure connection (18) to a source of pressure.

Abstract: A hidden storage is for vehicles such as vans and utility/sports utility vehicles without altering the external appearance of the vehicle. The hidden storage is located adjacent one or both sides of the vehicle between a rearmost side door and the rear of the vehicle. The hidden storage is accessible only via one or more hinged contoured side panel sections of the vehicle and which include at least one peripheral edge, and access to the interior of the vehicle does not provide access to the hidden storage area. The hidden storage is provided by a storage box secured to the side of the vehicle and the interior of the storage box is only accessible through opening of an associated hinged section of the side panel of the vehicle, which can be locked shut.

Abstract: A hermetically sealed reciprocating refrigeration compressor has a suction gas arrangement including a suction gas plenum formed integral with a cylinder block for supplying suction gas directly to a cylinder so as to eliminate the need for external suction gas conduits. Apertures are formed about the circumference of the cylinder for receiving suction gas directly from the suction gas plenum. Pistons are provided with multiple suction gas entrances and a semi-toroidal suction valve to provide an efficient way of introducing suction gas into a compression chamber during a suction stroke of the compressor. A spherical discharge valve assembly is provided in a valve plate adjacent the compression chamber for improved flow characteristics and increased through flow area.

Abstract: An air compressor cylinder sleeve is formed from an extrusion having a central passage surrounded by a plurality of closed sided passages. Preferably, grooves are formed between adjacent ones of the closed sided passages. The extrusion is cut into individual cylinder sleeves which are mounted on compressor housings. The central passage receives a piston which is reciprocated by an eccentric on a motor shaft. The ends of the closed sided passages adjacent the housing open into the interior of the housing and the opposite ends of the passages open to atmosphere. A fan on the motor shaft causes air to flow through the compressor housing and through the closed sided passages to cool the cylinder sleeve.

Abstract: A liquid pump comprises an insulated cylinder which is provided with a top seat and a bottom seat. The top seat is provided with a liquid inlet while the bottom seat is provided with a liquid outlet. A piston rod is fastened with the top seat and is provided at the bottom thereof with a one-way piston valve device capable of creating a vacuum in an upper chamber of the cylinder. The bottom seat comprises a receiving space in which a one-way valve device is disposed. The liquid contained in a vessel is drawn up by suction via the liquid inlet. The liquid so drawn up is discharged via the liquid outlet.

Abstract: The surface of a hydraulic cylinder is enclosed with a cylindrical casing. A fluid, preferably a thixotropic dielectric hydrophobic fluid which retains a gel structure when static, has a specific gravity greater than water and inhibits bacteriogenic and aqueous corrosion fills the annular space between the cylinder surface and the casing, preventing water that may be rich in bacteria, from reaching the cylinder surface. A fluid conduit between the annular space and a reservoir is provided and the fluid fills the reservoir to a predetermined level such that water, hydraulic fluid or another fluid in the system may be detected by a rise in the predetermined level. The water or hydraulic fluid can be easily removed as it will float on the top of the fluid in the reservoir.

Abstract: A fluid-powered actuator having a body with a shaft adapted for coupling to an external device to provide rotational drive thereto. A piston sleeve is mounted for reciprocal longitudinal movement within the body to provide rotational drive to the shaft. A plurality of seals are positioned within the body to provide a fluid-tight seal between the body and the shaft, and between the piston and both the shaft and the body. A pair of support members are positioned out of the body and fixedly attached to the body at spaced-apart locations. Each support member has an attachment portion extending circumferentially fully about the body, and a mounting portion. A pair of boom attachment plates are weldable to the mounting portions while the shaft, piston, torque-transmitting member, and seals remain assembled within the body. To avoid damage to the seals, a fluid channel is formed at least partially within each of the attachment portions and fully encircles the body.

Abstract: An exhaust gas flow control valve for an internal combustion engine comprises a body, a diaphragm actuator and a bracket. The body is equipped with an exhaust passage and a valve member arranged in the exhaust passage. The bracket is equipped with an actuator mounting seat for mounting the diaphragm actuator and a body mounting seat connected to the body. The diaphragm actuator is equipped with a casing connected to the actuator mounting seat of the bracket, a diaphragm cased in the casing and a rod protruding from the diaphragm and out of the casing for actuating the valve member in accordance with the action of the diaphragm. Between the actuator mounting seat of the bracket and the diaphragm of the diaphragm actuator, moreover, there is formed an insulating layer for insulating the heat to be transferred to the diaphragm.

Abstract: A refrigerant compressor construction including one or more cylinders and pistons and a cylinder head mounted over the end of the cylinders, the head having a base, a first wall providing a suction chamber and a second wall providing a discharge chamber, each of the walls being unitary with the base and spaced from each other to provide a thermal barrier between the chambers to minimize suction gas heating.

Abstract: In accordance with the invention, a hermetic refrigerant compressor pump which is used to compress helium is cooled by fins which are press fitted to the compressor's housing. The compressor is further cooled by a heat exchanger which cools oil in an oil sump located within the compressor housing. Preferably, a fan is located between the fins and the heat exchanger to help cool the pump.

Abstract: The invention concerns a reciprocating pump whose plunger (10) is connected with a plunger rod (12) that runs in a stuffing box (13) coordinated with the pump cylinder (9) cap and is reciprocated hydraulically, where the cylindrical walls of the pump cylinder (9) are provided, over their entire length, with flow-through openings for a cooling medium passing through them, and the flow-through openings in the cylindrical walls of the pump cylinder (9) are connected to a coolant circuit.