Abstract: A unique air dryer for use in an air compressor system which includes an air governor, an air compressor and a storage tank is disclosed. The air dryer incorporates therein an isolation valve adjacent the inlet from the compressor which serves to isolate the compressor during the unloading cycle. Also incorporated into the housing of the air dryer is a purge valve which is simultenously opened when the isolation valve is closed, and vice versa. A check valve is also incorporated into the air dryer housing adjacent the outlet to the storage tank. Finally, a small conduit connecting the inlet port from the compressor to the outlet of the air dryer is included. A small check valve is disposed within the conduit so that air flow is only permitted to flow from the outlet to the inlet when the system is in its unloaded mode in order to maintain pressure in the pipe which connects the compressor to the air dryer.

Abstract: A method for removing floating immiscible liquids from a well containing both the floating immiscible liquids and water, where the floating immiscible liquids and water meet at a water interface, by controlling a cone of depression within the well. A removal system for removing said floating immiscible liquids is used including a microprocessor, a discharge water line and an upper water interface sensor where at least a portion of the discharge water line is located within the well. The upper water interface sensor is located within the well at a sensor location.

Abstract: A common rail fuel system is described which consists primarily of a high-pressure fuel pump, nozzles and a rail or rails having a substantially constant rail pressure situated between the fuel pump and the nozzles, the necessary connecting fuel lines and electronic control system. The pump is constructed to add leakage fuel to each stroke output without the necessity for routing this leakage fuel through the primary supply. This reduces the total amount of fuel pumped and improves metering accuracy.

Abstract: A thick matter pump has two feed cylinders, each including an opening coupled in fluid communication with a material feed tank containing matter to be pumped. A tube switch is adapted to be alternately coupled on its intake side to the openings of the feed cylinders, and on its output side to a delivery pipe to permit the passage of pumped matter therethrough and into the delivery pipe. A shutoff device is supported between the output side of the tube switch and the delivery pipe. The shutoff device is adapted to open to permit the passage of pumped matter therethrough and to close to prevent the passage of pumped matter therethrough in accordance with the difference between the pressure on the input side and the pressure on the output side of the shutoff device, which difference is adjustable by hydraulic or pneumatic means.

Abstract: A fuel pump having a first pumping mechanism for pumping a fuel in a main tank to a subtank and having a second pumping mechanism for pumping the fuel in the subtank to an outside of the main tank. The fuel pump includes a rotatable impeller having a plurality of outer peripheral vanes, and a wall member surrounding the vanes so as to define a fuel flow passage. The wall member has two partition walls for partitioning the fuel flow passage into a first pumping passage and a second pumping passage, a first suction hole for communicating an upstream end of the first pumping passage to the main tank, a first discharge hole for communicating a downstream end of the first pumping passage to the subtank, a second suction hole for communicating an upstream end of the second pumping passage to the subtank, and a second discharge hole for communicating a downstream end of the second pumping passage out of the main tank.

Abstract: A discharge flow blocking valve for a compressor having a sealed housing having a cylinder and a piston for compressing refrigerant gas. A discharge muffler is within the housing and has an inlet opening communicating with the cylinder discharge volume, a first outlet opening communicating with the interior of the sealed housing, and a second outlet opening. The blocking valve has an outer casing with a first driving opening in communication with said second outlet of said discharge muffler, and a second driving opening in communication with the housing interior, an inlet in communication with the interior of the housing and an outlet in communication with a discharge mean extending through the housing.

Abstract: A fuel pumping apparatus of the rotary distributor type includes a spill passage 20 connected with the bore 12 which houses the pumping plungers 9. A seating 22 is defined about the spill passage and a valve member 23 is provided for cooperating with the seating. A piston 25 is coupled to the valve member and is slidable in a cylinder. The piston defines a surface against which fuel under pressure from the bore 12 can act to lift the valve member from the seating. The application of fuel under pressure to the surface of the piston is controlled by an electro-magnetically operable control valve 32A.

Abstract: A compressor unloaded system for use in compressed air supply systems having reciprocating type air compressor means supplied with atmospheric or turbocharged air is shown. Means are provided to block off the air intake of such compressors, and to maintain back pressure against the exhaust valve of said air compressor during an unloading cycle, thereby preventing operation of the intake and exhaust valves of such compressor, and creating an "air spring" in the cylinder of such air compressor during an unloading cycle.

Abstract: A regenerative pump which has a controlled output by having movable lateral channel arcuate slots (36, 38) in channel plates (26) which are on opposite sides of a bladed rotor (18). The channel plates (26) are mounted for sliding movement to reduce the effective vortex channel length in a range from about 325.degree. to about 40.degree.. This will result in a proportional reduction of pump pressure rise and input power requirements. The position of the channel plates may be varied by a servo system that responds to a desired system output performance such as pressure rise or flow delivery rate.

Abstract: The pressure side of the pump unit is provided with a valve (6) which during certain periods opens a connection between the pump and the pump station to obtain circulation in the station. The valve (6) is opened and closed by a valve ball (9) which is controlled by the pump pressure.

Abstract: A body located downstream of the compressor discharge port in an oil-injected screw compressor assembly includes a contoured surface for directing the flow of the gas-oil mixture discharged from the compressor. The body is movable in the compressor assembly between a first position in which the flow of the mixture out of the discharge port is unimpeded and a second position in which the backflow of gas from downstream of the discharge port back into and through the working chamber of the compressor is prevented. In the first position the body facilitates the separation of oil from the discharged compressed gas while in the second position the reverse direction rotation of the screw rotors in the compressor working chamber is prevented.

Abstract: A pump and a centrifugal impeller are arranged so that the pump has a suction line in which the centrifugal impeller is installed effecting a countercurrent opposite to the suction feed flow direction to the pump. The effect is to regulate the pump flow responsive to the speed of the centrifugal impeller so that the pump output flow decreases with rising pump speed.

Abstract: An apparatus designed for supplying liquid by means of a roller pump into a membrane module having membranes provided therein in such a way that liquid is introduced in pulsed state into the membrane module by periodically opening and closing a flow path by means of a valve disposed on the flow path on the inlet side or outlet side of the membrane module. The resistance of the membranes to material transfer is reduced and liquid channelling in the membrane module is reasonably avoided, so that the effective area of each membrane may be increased. The apparatus can be advantageously employed to improve the performance of various blood treating and body cavity fluid treating apparatuses incorporating membranes.

Abstract: A pump mechanism adapted to float on a reservoir of water characterized by a floating enclosure provided with an internal chamber, a float disposed within the chamber of the enclosure, a first valve coupled to the float and adapted to open and close an orifice provided at the top of the enclosure, a refill valve associated with an orifice provided at the bottom of the enclosure, and an output tube opening on the chamber of the enclosure and provided with a check valve to prevent the back flow of water into the chamber. As the air within the chamber expands the water within the chamber is expelled through the output tube causing the enclosure to float higher on the reservoir and the float to float lower within the enclosure. When the water level within the enclosure drops to a predetermined level, valves open to recharge the mechanism with water and cool air.

Abstract: The invention comprises a valve contained in a drainage line from a compressor tank and a control for operating the valve. The control includes a timer which comprises an air storage tank, an air bleed valve for bleeding the storage tank and structure for operating the valve in response to air pressure received from the air storage tank. The timer operator is initiated in response to deactivation of the compressor motor.

Abstract: A pump discharge assembly for a submergible pump installation, for use in an oil well and the like, has inlet ports for receiving liquid from a pump discharge, which ports are regulated by a back-pressure compensating valve. The valve obturates the ports upon start-up of the pump and prevents liquid being pumped unless or until the pump discharge pressure has attained a suitable level. The arrangement prevents excessive flow rate on start-up of the pump if the back-pressure is too low.

Abstract: A fluid injector suitable for injecting a fluid into a flowline having a fluid under pressure therein in which a piston divides the interior of a hollow body into a power chamber and a pumping chamber with a piston rod extending through the pumping chamber to the exterior of the body, fluid filling the pumping chamber, a discharge line from the pumping chamber through a valve to the flowline, and a supply line from the flowline to the power chamber, the valve in the supply line being controlled by the timed position of the piston. A method of injecting a fluid into a flowline including the steps of delivering pressure fluid from the flowline to a pressure responsive position displacement pumping means, delivering fluid from the pumping means through a valve to the flowline and controlling the valve to control the amount of fluid pumped responsive to the timed position of the pumping means.

Abstract: A fuel injection pump for internal combustion engines is proposed, the work chamber of which has a relief channel which is controllable via an electromagnetically actuatable valve, the movable valve element of which is urged in a closing direction by means of the pressure which prevails in the pump work chamber.

Abstract: A fuel injection pump for an internal combustion engine including a low pressure sump and a sump piston, reciprocating in a cylinder, for imparting elevated pressure to the fuel for delivery to injection valves. The pressure chamber in the pump cylinder can be opened to the sump at some adjustable point of the piston stroke to limit fuel delivery. A secondary conduit between the pressure chamber and the sump includes a flow throttle that variably restricts the return flow of fuel as adjusted by fluid pressure which is regulated by a secondary fuel control mechanism. This mechanism is subject to closed-loop control via an air flow rate meter disposed in the induction tube and also acts as a limiting stop for the baffle plate of the air flow rate meter.

Abstract: A volumetric infusion pump of the type having a rolling diaphragm pumping chamber includes a back pressure sensor between the rolling diaphragm pumping chamber and the pump outlet for sensing back pressure. A valve is positioned between the back pressure sensor and the pump outlet for controlling fluid flow to the pump outlet in order to control back pressure supplied to the rolling diaphragm pumping chamber. Back pressure is maintained within the rolling diaphragm pump chamber so that the rolling diaphragm maintains close contact with the piston even in the event of a negative head pressure at the pump outlet. The valve and the back pressure sensor are preferably linked so that the valve restricts fluid flow to the pump outlet only when the sensed back pressure is less than a predetermined level.

Abstract: A pump assembly for an hydraulic braking system comprises a housing having an inlet for connection to a tank for liquid, an outlet for connection to an hydraulic accumulator, and a piston reciprocably mounted in a bore in the housing to draw liquid into a working chamber during an induction stroke and to force it to the outlet during a power stroke. A drive mechanism is provided for moving the piston in one direction during the induction stroke, and the piston is moved in the opposite direction during the power stroke by subjecting the piston to pressure at the outlet.

Abstract: In the embodiment shown, the invention comprises a suction/check valve interposed in a gas inlet channel, the channel being open at one end for communication with the atmosphere, and at the opposite end for communication with a gas compressor inlet port. The valve has a bleed hole formed therein for slowly blowing down the compressor receiver at shutdown. A second check valve is operatively interposed between the receiver and the atmosphere for depressurizing the receiver when the compressor unloads. A conduit which communicates with both valves provides a valve-operating, fluid, pilot-pressure to close off the suction/check valve, and to interdict its bleed hole, and to open the second check valve, with compressor unloading.

Abstract: A low well yield control system and method for preventing over pumping of wells and other fluid reservoirs. The control is positioned in the reservoir and includes a plurality of relief valves which are opened to replenish liquid in the reservoir from the pumped liquid in the event the liquid level is lowered relative to a float.

Abstract: A variable air volume air conditioning system is provided with thermostat controlled variable air volume terminal boxes for controlling the volume of constant temperature conditioned air provided to each space to be conditioned. The conditioned air is delivered through a short pressure recovery duct to a trunk duct by a centrifugal fan having forward curved blades. The trunk duct pressure is maintained substantially constant by control vanes disposed at the recovery duct outlet, said control vanes being responsive to an increase in duct pressure to close the duct outlet and unload the fan, thereby reducing the energy consumed by the fan. Economizer operation is provided by the use of return air dampers and outside air dampers controlled in response to outside air temperature and air supply duct temperature to mix outside air and return air to reduce the amount of mechanical refrigeration required.

Abstract: A control system for preventing over-pumping of wells using submersible pumps. When the pump lowers the level of the water in the well, the control automatically diverts some or all of the water pumped back into the well to assure that sufficient water is available in the well for pumping. In this way, pump cavitation is eliminated and water is pumped from the well either at a rate equal to the capacity of the pump or, if the flow of water into the well is less than the capacity of the pump, at a rate equal to the flow of water into the well.

Abstract: A well point system is provided having automatic regulation of the flow of fluid through each riser in order to shut off an individual riser when the water level drops below the well point of that particular riser. The automatic regulation of the flow of water is controlled above the surface of the earth and includes a float actuated valve for preventing the pump from drawing air. The float actuated valve has a controlled air bleed for evacuating the riser and allowing the water to unseat the valve when the water rises around the well point.

Abstract: A fuel pump for an internal combustion engine of the type wherein cyclic pressure fluctuations are produced in the engine crankcase chamber during engine operation by the reciprocating motion of an engine piston. The pump embodies fuel pumping means including a pulsatory pumping member or pulsator, such as a diaphragm, and is mounted directly on the engine with the pumping pulsator exposed directly to the engine crankcase chamber in such a way that the chamber pressure fluctuations drive the pulsator in its pulsating pumping motion to pump fuel from the fuel inlet to the fuel outlet of the pump. Also embodied in the pump are a novel fuel pressure regulating valve for maintaining a substantially constant fuel outlet pressure regardless of engine speed and an automatic fuel shut-off valve for blocking fuel leakage through the pump under the action of head pressure or other forces when engine operation ceases.

Abstract: An electromagnetic pump comprising an electromagnetic coil, magnetic paths constituting a yoke arranged in the electromagnetic coil, an electromagnetic plunger reciprocatorily mounted in the electromagnetic coil, and a main body including a suction port, a discharge port and suction and discharge valve means and connected to the electromagnetic coil. At least one of the magnetic paths has a reduced cross-sectional area portion at one end portion thereof disposed on the longitudinal axis of the electromagnetic coil and is formed with a magnetic gap between the reduced cross-sectional area portion and the end portion of the electromagnetic plunger. A movable iron member of the cylindrical shape is arranged in the magnetic gap in which the lines of magnetic force are concentrated in passing through the magnetic path. The movable iron member is moved upwardly by the electromagnetic force to facilitate further concentration of the lines of magnetic force therein.

Abstract: A safety control system for a pump and anti-surge valve protects the pump, the valve and the hydraulic main line system. The valve is controlled by a pressure responsive circuit and, via a limit switch on the valve, controls both the steady state running of the pump and the pump start. A timed start circuit allows pressure to build up sufficiently to operate the valve upon initiation of pump operation. The system automatically shuts down upon power, mechanical or hydraulic failure, and prevents continued operation of the pump control valve when the pump has lost suction or there is a decrease in pump discharge pressure.

Abstract: A centrifugal type impeller pump has a restricting valve to control the inlet area of the collector for reducing recirculating flow from the collector to the impeller. The restricting valve includes a ring mounted upon the pump housing for rotary and axial motion. Rotary motion is imparted to the ring by an actuator. Cam slots in the ring and pins secured to the housing produce axial motion of the ring as the ring rotates. Precise positioning of the ring is possible because large motions of the actuator can be utilized to provide small changes in ring position. The axial position of the ring is determinative of the inlet area of the collector.

Abstract: The invention relates to a fuel oil supply assembly of the type having a magnetic pump and an armature for driving a pump element or piston which is a part of a resilient oscillatory system. A flow restricting pressure regulating vlave in the delivery line is itself regulated in a manner such that the stroke of the oscillatory system is automatically adjusted so that only the exact quantity of oil required by the nozzle is delivered. The intermittent delivery movement inherent in the oscillatory system is thus made smoother by a damping of the oscillations which results from the piston being caused to travel over only a fraction of its maximum stroke.

Abstract: A combination high pressure relief valve and magnetic clutch disconnect switch for an air conditioning compressor which utilizes an automatically resetting valve member. The escape of pressurized refrigerant under control of the relief valve pressurizes the interior of a cap member on the end of the relief valve and thereby disconnects the ground circuit portion of the electromagnetic compressor clutch. This renders the system inoperative until the cap can be replaced and the original cause of the high pressure is determined and remedied.