Abstract: A pump control assembly for a variable displacement pump has adjustable biasing means for providing improved control of the pump.

Abstract: A hydraulic machine is provided with a control for reducing the capacity of the machine when subjected to excessive pressure.A piston is slidable in a cylinder to define two chambers, the chambers being interconnected by a restrictive passage. One chamber is connected to the pressure line and the other chamber is connected to a relief valve so that in the steady state the pressure in each is equal. When the pressure reaches a predetermined level the relief valve opens and vents the other chamber. The passage prevents flow to the other chamber creating a pressure differential which causes the piston to move along the cylinder and operate the machine control to decrease the capacity thereof.

Abstract: The operation of a 4-way, open-center, three position hydraulic valve is coordinated with the operation of the pump for the hydraulic system in which the valve is controlling flow. As the valve is moving from its open-center position to either one of its other two operative positions, a switch maintains the power circuit for the pump open and closes that circuit to activate the pump after the valve has assumed one of the other two positions.

Abstract: A fluid suction and discharge apparatus of a small volume suitable for a fluid compressor which can be used for an air-conditioning system, which includes a cylinder block having a plurality of axially directed cylinders formed therein in annular relation and a single sheet of suction reed valve means which is formed of a metal sheet and with a plurality of holes corresponding to a plurality of cylinders and with a plurality of suction reeds extending in the holes respectively and means for preventing the fluid such as a refrigerant gas from leaking out of the cylinders through the contact gap between the suction reed valve means and a valve plate which the suction reed valve is secured to and is in contact with.The valve plate is secured onto one end surface of the cylinder block by means of bolts which extend through the valve plate, the suction reed valve means and a gasket which is held between the cylinder block and the suction reed valve means.

Abstract: Flexible diaphragms mounted on the ends of a shaft contact a liquid to be dispensed (e.g., syrup bases). A chamber is located about the shaft side of each diaphragm, which chamber is in communication via shaft passages with outlets in the shaft wall. A valving member is slidingly received on the shaft and interconnected with a source of pressurized gas by a flexible hose. The valving members transfers from a position where one opening is in communication with the pressurized gas and the other opening is exposed, to a second position where the relationship of the shaft openings to the valving member is reversed. A pair of opposed coil openings urge the valving member past the longitudinal shaft center to reverse direction after the coils are sufficiently loaded, which results when the valving member is at the end of either shaft stroke.

Abstract: A piston compressor, in which an electromagnet coil is mounted on the outer side of the cylinder block cover and is used to actuate the suction valves of the cylinder block. The electromagnet coil is connected to each suction valve of the cylinder block through a magnetic circuit. The magnetic circuit is formed by the cylinder block cover, by the cylinder block body and by the pressure valve of each cylinder. The cylinder block cover and the cylinder block body are interlaid with a gasket made of nonmagnetic material.

Abstract: A lubrication system for use in a compressor unit includes a deflector projecting from the inner wall of the compressor housing which collects lubricating oil splashed onto the housing wall and channels the lubricating oil thus collected to the shaft seal cavity.

Abstract: A pumping system is provided in which a low pressure metering pump injects fluid charges into a high pressure pump which in turn operates into a high pressure load. The high pressure pump is designed to always present a low pressure at its input on its intake stroke. This insures that the metering pump will always operate into a low pressure regardless of the load, and will therefore be enabled to always accurately meter charges into the high pressure pump.In various embodiments, the high pressure pump and/or the low pressure pump include spring elements for providing well defined pumping pressures.In some embodiments, an oil reservoir and diaphragm provide a well defined pressure against which the metering pump can operate.

Abstract: A swash-plate type compressor is provided with an improved internal arrangement for lubricating internal moving elements, such as bearings, pistons and shoes wherein a passage is provided for introducing a foam of the lubrication oil, which was generated in the reservoir at the moment of starting the compressor, into the swash-plate chamber and the cylinder bores for lubricating the internal moving elements. The improved internal arrangement further contributes to effective employment of the blow-by refrigerant gas for the distribution of lubrication oil to the bearings and the cylinder bores.

Abstract: A heat or thermal energy storage structure comprising a crosslinked polymeric resinous matrix having a plurality of substantially unconnected small closed cavities and a heat sink material encapsulated within the cavities. The structure is characterized in that the heat sink material forms an essentially stable dispersion in the uncured polymeric resinous matrix when mixed therewith before the matrix is crosslinked. The structure can beneficially be used in conjunction with low level heat or thermal energy collector means and heat transfer means to provide a space heating or cooling apparatus. The storage structure may also be effectively used to provide an additional function of a building component in a building construction such as a wall structure.

Abstract: A continuously operable piston pump for conveying of viscous materials, such as mortar mixes or the like comprises first and second chambers separated from a pressure source, such as a piston cylinder arrangement, by respective flexible wall means. The chambers are connected in series with each other. The pressure source is controlled by a further piston cylinder arrangement including a control valve at each end of the control cylinder. The control valves are operated by a flip-flop means which in turn is actuated by means directly coupling the flip-flop means to the piston rod of the control piston cylinder arrangement. The pressure piston cylinder arrangement and the control piston cylinder arrangement are constructed to have a common axis, and thus also a common piston rod located in said axis. The control valves are connected to said common piston rod.

Abstract: A positive displacement pump or motor having a plurality of cylinders in a rotatable cylinder block, the axes of the cylinders being parallel to the axis of rotation of the block, and stationary inlet and discharge ports which overlap openings in the cylinders so that port areas are constantly open to permit constant flow into the cylinders and constant flow out of the cylinders.

Abstract: All of the components of a sump pump apparatus necessary to be in the sump are enclosed in a common case. In one embodiment, this case is of plastic and holds the motor means, the pump impeller and at least part of the water level sensors. The motor means is in a bell holding trapped air so that the water cannot reach the motor means. In one such embodiment the motor means is a single D.C. motor and in another embodiment it consists of a D.C. motor coupled by a one-way clutch to an A.C. motor which in turn is connected to the pump impeller. In each of these two embodiments, the water level sensor includes a tube having an open end in the bell to sample the air pressure in the bell and an end externally of the sump connected to a pressure actuated switch which turns on the motor means at a particular air pressure above ambient. Also within the bell is a float operated switch serving as a back-up to the air actuated switch. Using two motors, as mentioned above, the A.C.

Abstract: A variable displacement hydraulic system includes a charge system having a substantially constant charge pressure, a reciprocating piston type pump having a drive chamber in communication with the charge system, and a control valve regulating the flow of fluid from the charge system to the inlet of the reciprocating piston type pump which is manually movable from a closed fluid blocking position through a first range in which it varies and controls the quantity of fluid flowing to the pump inlet and a second range in which it varies the control of pressure of fluid flowing to the pump inlet at flow rates greater than those obtainable in the first range.

Abstract: This hydraulic engine utilizes two sets of hydraulic cylinders connected to a shaft so as to be alternately pressurized as the shaft is reciprocally driven by a pair of conventional internal combustion chambers. The outlets of all hydraulic cylinders are connected to a common output line via valves. During each power stroke certain of the hydraulic cylinders being pressurized are selectively disconnected (depressurized) from the output line. This effectively decreases the load on the driving chamber, and insures a relatively constant, high pressure hydraulic fluid output level despite changes in supplied force during each power stroke. The selective cylinder disconnection may be implemented programmatically in response to changes in engine parameters such as combustion chamber pressure. The engine also includes a pump for supplying input hydraulic fluid to each set of cylinders while that set is not being pressurized. The input fluid force is additive to the power supplied by the operative combustion chamber.

Abstract: A method is disclosed for a cascade control of a dynamic compressor to maintain a constant mass flow rate to a process. The method consists of a successive junction of control loops for controlling the speed of rotation, the pressure in the delivery, and the mass flow rate; the output signal of each outer loop being the input signal for the inner loop and each of the loops containing a compensating element to reduce the effects of large time constants of all previous loops.An automatic control system based on using the above method, distinguished by its great static and dynamic precision in maintaining a controlled parameter, and by the high reliability of protection of the compressor from surge, and protection from a dangerous increase of the speed of rotation and of a dangerous increase of the discharge pressure.

Abstract: A fuel tank assembly of a fuel tank and a centrifugal fuel pump, said pump being mounted outside said tank by a conduit structure, wherein an impeller of said pump is positioned below the predetermined lowest fuel level in said tank.

Abstract: A sump pump system includes a remote pressure responsive switch assembly designed for a wall plug and having a plug in connection for the pump motor cord, the pressure responsive switch assembly also having an air pressure connection to the sump pump for actuating the switch in response to a rise in level of water around the pump.

Abstract: Relative motion is provided between a set of primary magnets positioned along a path of relative motion, and a set of secondary magnets positioned along the path of motion to confront the primary magnets. Such motion causes the primary magnets to displace the secondary magnets in directions transverse to the path. Power output means are driven by transverse displacement of the secondary magnets. The polarities of the magnets are such that the forces of magnetic attraction in one direction parallel to the path are substantially equal to the forces of magnetic repulsion in the opposite direction parallel to the path, whereby a minimum of energy is required to produce said relative motion. SUThis invention relates to an energy conversion system wherein primary motion in a given path produces secondary motion in a direction transverse to the given path.

Abstract: A two-stage pump assembly employs a rotary-type gerotor pump combined with a reciprocating axial piston-type pump both mounted on and driven by a common shaft of a motor. A single key drivingly connects the rotor of the gerotor pump and the angle plate of the axial piston pump to the shaft of the motor for simultaneous operation of the two pumps. A wear sleeve is seated on the shaft of the motor and coacts with an oil seal carried by a common wall between the motor and the gerotor housing to prevent leaking of the fluid being pumped.