Abstract: A laboratory pump (1) for liquids has a pump housing (2) with an inlet opening (3) and an outlet opening (4) and in which at least one pump rotor (5) rotates. The pump rotor (5) is joined either directly or indirectly by means of a transmission with a magnet (6), which is magnetically coupled with a rotating magnetic field of a magnetic stirrer (8). In addition, the pump housing (2) of the pump (1) can be joined with the magnetic stirrer (8) in such a way that the magnet (6) comes under the influence range of the rotating magnetic field of the magnetic stirrer (8) and is driven by it. The pump has no driving means of its own, and therefore can be designed in an especially simple way. Magnetic stirrers (8) present in laboratories can be used for driving the pump (1), and thus obtain an additional function.

Abstract: A device for operating pumps in an installation for the foaming of polyurethan comprising two vertical tanks each containing a component for obtaining polyurethan, a pump provided on the lower part of each tank to pump the material from said tank towards a mold for foaming, a shaft passing vertically through each tank, a pump connected to one end of said shaft, a plate for covering the tops of said tanks, the other end of said shaft passing through said plate, and means attached to said other end of each of said shaft and connected one to the other by which said pumps are driven.

Abstract: A solid material pump comprising a pump housing, a pair of parallel pump cylinders driven by hydraulic cylinders and each connected to a pump chamber, a slurry feed device which communicates via inlet valves with inlet valve chambers each of which communicates with a pump chamber, the axes of valve cylinders for actuating the inlet valves extending in parallel and spaced relationship to the axes of the pump cylinders and the inlet openings being provided at the pump housing opposite to the pump cylinder whereby the sucked-in flow is deflected twice, further comprising outlet valve chambers adapted to communicate via outlet valves each with a pump chamber and connected to a common outlet conduit, with the valve cylinders for actuating the outlet valves being connected to the pump housing on the side opposite to the inlet valve cylinders and their axes extending in parallel and spaced relationship to the axes of the pump cylinders and the inlet valve cylinders.

Abstract: A compressor has a housing divided by a valve plate into a first chamber and a second chamber. The second chamber has a suction chamber and a discharge chamber. The valve plate includes discharge conduits communicating the first chamber with the discharge chamber and suction conduits communicating the first chamber with the suction chamber. A suction valve member bends to open and close the suction conduits in response to changes in discharge chamber pressure and the resulting pressure difference between the first chamber and the suction chamber. A suction valve control mechanism includes a regulator for regulating opening and closing of the suction valve between a maximum opening position and a minimum opening position in response to changes in discharge chamber pressure.

Abstract: A two-stage speed change mechanism for a swash plate hydraulic motor, in which a swash plate is moved even during the revolution of the swash type hydraulic motor, thereby making it possible to vary the exclusion volume. An accommodating bore for accommodating a fixing pin is formed on a side wall of a housing. Piston for shifting the swash plate is provided, and control valves 14,15 and 16 each including a pilot line 14, a spool 15 and a compression spring 16 are installed for the actuation of the swash plate shifting piston 3. Thus the exclusion volume can be safely varied even during the rotating of the hydraulic motor.

Abstract: A pressure medium operated device generating to-and-fro motion to one or several pistons or a similar motion transmitting arm. The device includes a primary piston to which motion is brought in transmitting pressure medium alternately to both sides of the piston and control valves located inside the primary piston for controlling the pressure medium which moves the primary piston.

Abstract: A hydraulic pump is disclosed which uses a side-discharge valve plate. The present valve plate includes a valve plate body having front and back surfaces with a side defining the peripheral surface therebetween. First and second fluid passages are formed on at least one of said front and back surfaces for respectively defining a fluid inlet for supplying hydraulic fluid to a piston and a fluid outlet for receiving pressurized hydraulic fluid from a piston. At least one fluid access is formed in the side of the valve plate body, connecting with at least one of said fluid passages to define a fluid pathway therewith. The design of the present invention thereby permits a pump design have shorter axial length, permitting a smaller size pump which offers improved space considerations. Also, the present valve plate also has few contact surfaces, thereby reducing leakage and improving pump efficiency.

Abstract: An air pump with dual air intakes includes a hollow pump body, a securing cover, a piston rod, a piston, an air outlet, a check valve, an air duct and a handle. The pump body has one end connected to the air outlet and the check valve. The peripheral rim of the pump body near the air outlet is provided with multiple air inlets. A diaphragm is disposed at the inner side of the peripheral rim. The other end of the pump body is connected to the securing cover provided with multiple air inlets. A diaphragm is secured to the inner side of the securing cover. Both diaphragms may cover the corresponding air inlets. The piston is connected to one end of the piston rod and is provided with an annular groove at its periphery. The annular groove has through holes communicating with the piston rod and is fitted with an annular gasket. The piston rod has fitted therein the air duct connecting to the air outlet. The other end of the piston rod projects from the pump body and connected to the handle.

Abstract: A scroll-type refrigeration compressor is disclosed which incorporates an efficient, reliable, low cost modulation system employing a single actuator to effect switching between full and reduced capacity operation. The modulation system of the present invention includes an annular valving ring rotationally supported on the non-orbiting scroll which operates to ensure simultaneous opening and closing one or more unloading passages thus avoiding the possibility of even transient pressure imbalances between opposed compression pockets during operation of the compressor or in one of the alternative embodiments, providing a controlled imbalance to provide a noise reducing torsional loading on the Oldham coupling. Further, the modulation system of the present invention provides for reduced capacity at both start up and shut down thus enabling the use of more efficient lower starting torque motors and reducing the potential for noise generating reverse rotation on shut down.

Abstract: An engaging device for releasably engaging an object. The engaging device comprises a supporting part and an engaging part mounted on the supporting part for pivotal movement about two spaced apart pivot axes between two stable conditions one being an engaging condition and the other being a release condition. The engaging part comprises two spaced apart arm portions and an elongated bridge portion extending between the arm portions, and means for causing the engaging part to in use remain in the engaging condition in response to the application of a pulling force between the object and the engaging device.

Abstract: A pump comprises a pair of coaxial pistons, one slidably positioned in the other for simultaneous compression causing oppositely directed air flow, a passage having a valve for permitting air flow from one such piston to enter the other such piston for increased air flow, and a switching device for selectively opening the passage to ambient for preventing air flow between the pistons. The pump thus has two modes, namely, a high volume mode when the two pistons operate simultaneously to direct combined air flow and a high pressure mode when the passage is opened to ambient to direct air flow from only one of the two pistons having a smaller bore.

Abstract: A scroll-type refrigerant compressor having a movable scroll unit and a stationary scroll unit which has a fixed stationary end plate in which a plurality of bypass ports and a discharge port are formed through which the refrigerant compressed in the pockets formed between the movable and stationary scroll units is discharged via check valves covering the bypass ports and the discharge port and preventing a reverse flow of the discharged refrigerant into the pockets. The compressor further having a suction port fluidly connected to an evaporator of an air-conditioning system, a delivery port fluidly connected to a condenser of the air-conditioning system, and a fluid channel for providing a fluid communication between the suction and delivery ports via a solenoid-operated valve for blocking and unblocking the fluid channel. The compressor can be switched from the ordinary 100% capacity to 0% capacity and vice versa.

Abstract: In an automatic transmission, the amount of transmission fluid discharged is controlled by a flow control valve. A fixed displacement type pump is connected with a bypass passage through which a part of fluid discharged from a discharge port of the pump flows back to a suction port of the pump. A flow control valve is provided in the bypass passage so as to regulate the amount of discharged fluid at an approximate equal level according to a feedback pressure generated in a pressure regulating valve.

Abstract: An automatic bailer is used to remove water from an open vessel such as a whitewater canoe. The bailer utilizes a submersible pump that is connected to a power supply through flexible connections. These flexible connections allow flexural movement between the pump and the power supply which may be due to flexure of the floor of the vessel to which the bailer is securely yet removably attached or which may be a result of variations in vessel floor contours or configurations.

Abstract: A fuel pump unit comprises a pump supporting flange for closing an opening in a fuel tank. The supporting flange has a wet side from which projects a fuel pump and an opposite dry side from which projects a lip defining a through opening in the supporting flange. An electrical connector has a mating portion for mating with a further connector connected to the power supply for the pump. There depends from the mating portion an insulating block into which have been moulded electrical tabs each having one end projecting into the mating portion and the other end projecting below the insulating block. Leads are connected to these lower portions of the tab terminals by means of electrical clips. The connector is inserted through the opening in the supporting flange from the wet side thereof so that a resilient skirt surrounding the insulating block is force fitted to the inner surface of the lip and a sealing ring is compressed by a flange at the bottom of the skirt, against the wet side of the supporting flange.

Abstract: A new and improved diaphragm metering pump is provided with a modular removable drive assembly. The removable drive assembly provides rotation to an eccentric shaft within the pump and is disposed outside rotary bearings for the eccentric shaft and outside sealing elements containing hydraulic fluid in the pump housing. In a preferred embodiment, a readily accessible mechanically activated hydraulic refill valve cartridge is provided to hydraulically balance the diaphragm. In a preferred embodiment, a push to prime air bleeder valve is provided permitting automatic priming of the hydraulic system without requiring disconnection of any valves. The pump is designed to interchangeably receive a number of diaphragm assemblies including an improved leak detection diaphragm and a double-sided leak detection diaphragm. In a preferred embodiment, a diagnostics window is provided permitting visual inspection of the operating condition of various valves connected to the hydraulic system.

Abstract: A gas driven pump has a housing, first and second cylinders disposed within the housing, and first and second interconnected pistons having product intake and product exhaust positions disposed within the first and second cylinders, respectively. A slide valve has first and second positions for alternately pressurizing one of the first and second cylinders and venting the other of the first and second cylinders. A linkage moves the slide valve between the first and second positions thereof in response to movement of the first and second pistons. Over-center construction of the linkage prevents stalling of the slide valve, so as to assure reliable operation of the gas driven pump. The slide valve comprises a slide for placing an inlet port in fluid communication with an alternating one of two pressure/vent ports such that the slide valve scrapes frost build up from the pressure/vent ports as it moves thereover, thereby further enhancing reliability of the gas driven pump.

Abstract: An wet-rotor hydronic heating/cooling circulator in which a check valve is positioned at the inlet eye of the pump impeller, where it can easily be serviced by removing the circulator motor and impeller. The check valve is preferably in the form of a valve subassembly that is removably inserted into an opening at the eye.

Abstract: A self-regulating fuel supply pump for supplying fuel from a fuel tank to a fuel rail of an engine includes a housing having an inlet, an outlet, an inlet pressure chamber, a vane surplus chamber, a pumping chamber, an outlet pressure chamber, an inlet pressure passage, and an outlet pressure passage; a rotor drive shaft; a pressure regulation spring; a reference pressure piston; an outlet pressure piston; a vane seal; a cylindrical rotor; and vanes slip-mounted in the rotor. Fuel is drawn into the inlet by the rotor and vanes rotating on the rotor drive shaft within the pumping chamber and compressed by reducing vane width via the eccentric orientation of the rotor in the pumping chamber. Pressure regulation spring combines with reference pressure piston and outlet pressure piston to vary vane length according to the pressure differential between inlet pressure chamber and outlet pressure chamber, as provided by inlet pressure passage and outlet pressure passage.

Abstract: A hydraulically driven membrane pump, particularly a high pressure membrane pump, having a membrane which is held on its edges by a clamp between a pump housing and a pump cover, which membrane separates a pumping space from a hydraulic compression space, and may particularly be a metal membrane. A hydraulic membrane drive in the form of a reciprocating displacement piston is slidably mounted in a cylindrical bore in the pump housing, which piston is disposed between the compression space and a reservoir space for the hydraulic fluid. A leak replenishment device including a snuffle link in the form of a connecting channel between the compression space and the reservoir space, which snuffle link is normally closed off by an underpressure-controlled spring-loaded snuffle valve.