Abstract: A thrust piston pump for the delivery of media has a spring constructed in one piece with the piston rod of a piston unit and located in the pump chamber, which is guided on a sloping surface formed by an internal cone. The piston rod is constructed in such a way that an axially resiliently compressible, sleeve-like piston collar can be fitted from the outer end of the piston rod. The fastening cap can be constructed in one piece with a flange edge, a ring packing and/or a component of the cylinder casing, particularly its cylinder cover. This leads to high pump reliability, in the case of simple construction and easy assembly.

Abstract: A swash plate type compressor comprising a swash plate and a plurality of double headed pistons reciprocatingly moved by the swash plate through a shoe-and-socket joint. The shoe and socket are shaped in a mating semi-spherical convex and concave configuration which has a center of curvature which is offset from the axis of the piston circumferentially of the swash plate to mitigate the swinging motion of the pistons and decrease the noise of the compressor.

Abstract: A pump assembly (10) is disclosed which incorporates a double acting power end (12) to operate opposed single or double acting pumps (84, 102). First and second crossheads (30, 64) are reciprocated along the pumping axis (38) by rotation of the crankshaft (20) within the power end (12). A single acting pump is connected to each of the crossheads so that the pumping stroke of the pumps occur in opposite directions as the crossheads are reciprocated. This provides a constant loading of the power end in compression to most efficiently use the power end while realizing the advantages of using single acting pumps. The crossheads are guided for motion along the pumping axis by adjustable cradles (40, 46, 70, 72) which are initially secured to the frame of the pump assembly for limited motion and the crossheads reciprocated through their range of motion to align the cradles with the crossheads and subsequently rigidly secure the frame in the aligned positions as by fastening assemblies (52).

Abstract: A scavenging system (10 or 110) for hydraulic circulation installations. A pump (25) delivers the hydraulic fluid (19) which is thereafter collected in a sump (18 or 18A) that is to be maintained essentially dry. A reservoir (28), independent of the sump (18 or 18A), is supplied for storing the requisite volume of hydraulic fluid (19) for the installation with which the scavenging system (10 or 110) is to be used, and a pump (25) supplies the fluid (19) from this reservoir (28). At least one pickup head assembly (22) is disposed within each sump (18 or 18A), and a float valve (45) is mounted within each pickup head assembly (22). The float valve (45) acts, in response to the level of the fluid (19) within the sump (18 or 18A), to open and close communication through a scavenging conduit system (38) that connects between the sump (18 or 18A) and the reservoir (28).

Abstract: A pumping unit for the filling of containers in packaging machines, in particular of foodstuffs with fluid behavior with the presence of suspended particles, which allows reliable operation under aseptic conditions, and which is easily cleanable. The conical shutter of the pumping unit, selectively connecting the pumping piston to the product intake duct and to the product delivery duct, is movable backwards from its seat, so as to allow an easy and reliable cleaning of unit's body, with no danger of product deposit with consequent loss of aseptic conditions.

Abstract: A pressure relief valve for a hermetically sealed reciprocating piston compressor is disclosed in which a bore in a compressor cylinder head defines the valve body. Valve components are introduced into the bore through a valve opening on the bottom surface of the cylinder head. A discharge pressure chamber in the cylinder head also has a discharge pressure opening on the bottom surface. A path is provided between the valve opening and the discharge pressure opening, when the compressor is assembled, by means of a duct in a valve plate interposed between the cylinder head and a compressor crankcase. Also disclosed is a method for assembling the pressure relief valve in a cylinder head, whereby the valve components are temporarily retained within the bore by a washer-shaped soft metal valve seat that is compressed and expanded into an annular undercut or recess in the bore located adjacent to the bottom surface of the cylinder head.

Abstract: A liquid fuel pumping apparatus of the rotary distributor type has a rotary distributor which is also axially movable to determine the quantity of fuel supplied by the apparatus. Inclined stop surfaces are provided to limit the outward movement of the pumping plungers during the filling strokes and an axial reaction is applied to the distributor member when the surfaces engage. The axial position of the distributor member is controlled by applying fluid pressure to one end thereof, the fluid being supplied to a chamber. A supply pasage to the chamber includes a check valve and escape of fluid from the chamber is controlled by a sleeve which covers a port. When the axial reaction is applied the port is closed by the sleeve and the check valve closes to form a hydraulic lock.

Abstract: A partially buried pumping or lift station including a below-ground wet well covered by a well cap and a partially buried pumping unit having an above-ground, removable cover by which access to above-ground pumps is provided. The enclosure sits atop the wet well cap and includes a wall section extending substantially vertically that is sealingly engageable by the removable cover. The cover is raiseable by a jack mechanism that includes a hub assembly attached to the cover which allows the cover to be rotated about a vertical axis. The axis is located near a perimeter region of the wall section. The eccentric mounting of the cover allows the cover to be rotated to a retracted position at which it substantially completely exposes the interior of the enclosure. In an alternate embodiment, the cover is mounted to a trackway which supports the cover for rectilinear transverse movement.

Abstract: An apparatus for displacing a high viscous substance, such as grease, which comprises a positive displacement-type pump. The chamber of the pump is in communication with a second chamber defined by a tubular sleeve that is slidably displaceable on the body of the pump, thereby rendering the volume of the second chamber variable and, as such, providing for effective displacement of grease into the chamber of the pump via a valve arrangement. A closure member is disposed to control charging of the second chamber with grease and the displacement of such grease from the second chamber into the chamber of the pump. Also, simultaneously with the charging of the chamber the pump can displace grease therefrom for lubricating or other applications.

Abstract: A pump and a stress and fatigue resistant pump head, one embodiment of which is useful for a high pressure pump and having a manifold, a valve cartridge, inlet and outlet valves in the valve cartridge, a pump fluid cylinder with a reciprocating plunger therein, a packing cartridge with packing for the plunger. The pump head may exhibit one or more of the following features: a. increased diameter packing cartridge; b. increased length front bushing; c. inclined inlet valve; d. inlet valve spring in valve cartridge on manifold side of valve; e. decreased diameter of high pressure seal of packing cartridge.

Abstract: A radial piston pump includes an axially slidable rotor which is rotatably connected to a connected shaft through a spring clutch engaging one end face of the rotor. The rotor is located in a housing or in the stator so as to constitute a frontal gap between the rotor and the housing or stator on the pressure side of the machine, through which frontal gap, during operation of the device, pressure fluid of the pressure side is permitted to be supplied to at least one sector area of that end face of the rotor opposite the spring clutch. This causes centering of the rotor by the spring clutch and by the pressure of the pressure side in such a manner that no metallic contacts occur in an axial direction and, thus, no friction losses.

Abstract: A vane pump having a plurality of working chambers each of whose volume changes from a minimum to a maximum value and back again during one revolution, and wherein intake and delivery ports open axially into the working cells and are formed with cross sections adapted for fluid conveyance without internal compression. Such compression is achieved by a valve plate which forms a non-return and is formed with a resilient tongue valve which, commencing from the starting end of the delivery port controls, upon proper pump operation, about two-thirds of the cross section of the mouth of the delivery port.

Abstract: A rotary hydraulic machine which includes a housing having a shaft mounted for rotation within the housing about a shaft axis. A cylinder block is coupled to the shaft for corotation with the shaft within the housing and includes a plurality of cylinders disposed in a circumferential array parallel to and surrounding the shaft axis. A piston is disposed to reciprocate within each of the cylinders and is coupled to a yoke for determining displacement of the pistons within the cylinders. A valve plate is affixed within the housing and includes arcuate slots at a radius from the axis of rotation corresponding to that of the cylinders. The slots respectively connect cylinders to the machine inlet and outlet ports as the cylinders register with the slots.

Abstract: A gas compressor has a cup-like casing. A driving shaft is rotatably carried by a bottom of the casing and has a rotary plate secured thereto. A driven shaft is disposed in the casing at an inclination angle of 20.degree. against the driving shaft, supported by a bearing provided on an end of the driving shaft, and driven by the driving shaft. A cylinder block is fixed to the driven shaft and has a cylinder bores receiving pistons coupled with the rotary plate so that the pistons reciprocate in the cylinder bores upon rotation of the driving shaft. A side plate is secured to an open end of said casing and has a bore receiving a bearing for supporting one end of the driven shaft. The bore is formed in the inside the side plate which projects outside, so that a distance between the bearing of the driving shaft and the bearing in the bore is extended and stable.

Abstract: This invention relates generally to the sensing of phenomena using heat sensitive devices. More particularly, the invention relates to an improved method and system wherein the ratio of the dissipation coefficients of a pair of electrically heated matched temperature sensitive devices is detected, which method and system are insensitive to variation in ambient temperature.

Abstract: An oil reservoir assembly for delivering oil through an oil port in a vertical housing wall of a heavy, clumsy, housed mechanism which must be moved into operating position through a restricted access opening. The oil reservoir assembly is attached to the vertical housing wall in oil delivering disposition relative to the oil port. During positioning of the mechanism the reservoir assembly becomes operably associated with the distal end of an oil supply line. The assembly comprises a casing having a wall with a hole therethrough. The casing defines an oil reservoir chamber and is connected to the vertical wall of the mechanism with the oil reservoir chamber in fluid communication with the oil port. A frusto-conically shaped guidance member is mounted within the chamber in alignment with the hole.

Abstract: A multi-lobe gradient cam for a high performance liquid chromatography pump for controlling proportions of HPLC solvents on the low pressure side of the pump. The gradient cam is non-concentric, and has an upward or draw gradient ridge over a majority of its circumference and a downward or thrust gradient over a minority of its circumference. In operation, the cam is designed to be used with two followers, located 180.degree. apart, which follow along the cam's gradient. The unique cut of the multi-lobe cam insures a constant suction on the inlet or suction side of the cam during the entire pump cycle.

Abstract: A shoe-and-socket joint, which is incorporated into a swash plate type compressor as a drive force transmitting unit arranged between a rotational swash plate and each of a plurality of reciprocal pistons, has a shoe provided with a spherically formed contact face and a recessed curved socket, for example, an ellipsoidal socket, deviated from a spherical form. Therefore, there is provided a wedge-shaped clearance between the socket and the shoe. An oil containing refrigerant gas flows enough into between the socket and the shoe to achieve a good lubrication.

Abstract: A valve arrangement for a variable displacement refrigerant compressor comprising one or more valve assemblies adapted to regulate fluid communication between the compressor's discharge cavity and the interior of the crankcase as a function of a predetermined fluid pressure differential. The valve assemblies operate to modulate, as a function of the ambient temperature, the set point of the compressor thereby avoiding evaporator freeze up.

Abstract: A hydraulic gear pump is disclosed wherein the meshing teeth of the gears define fluid cells which are expanded in the intake portion and receive the fluid from an inlet, and then compressed in the discharge portion to expel the fluid. The fluid is expelled to a common discharge chamber through a plurality of outlets which are positioned along the rotational direction and which are separated by a distance corresponding to the pitch of the gear teeth. The inlet to the pump includes at least two parallel lines which are each connected to a tank, and the first line is provided with a fixed throttle, and the second line is provided with a pressure control valve which is controlled by the pressure in the pump discharge chamber. The inlet may include a third parallel line, which is provided with a further valve and which is controlled by an externally monitored parameter.