Abstract: The invention relates to a control valve (10) for controlling the pressure and flow of hydraulic oil from or to the working connections (A, B) of a consumer. The pressure and the pressure flow are controlled by means of at least one sliding piston which can be actuated by at least one drive mechanism and which can be displaced in a slider hole and in co-operating annular channels. The invention is characterized in that the annular channels are symmetrically arranged, whereby a tank connection annular channel is arranged in the symmetrical centre point on a symmetrical axis. Annular channels associated with the working connections (A, B), pump-pressure annular channels, load-sensing annular channels and end-chamber annular channels are arranged behind each other on both sides. According to the invention, the latter can be connected to other channels.
Abstract: Provided is a servovalve system for regulating fluid flowing within a fluid circuit. The servovalve system comprises a housing, a spool slidably disposed within the housing, a stepper motor operatively connected to the spool, and a controller and a position sensor electronically connected to the stepper motor. The controller generates driver signals representative of a desired amount of stepper motor rotation in order to cause the stepper motor to effectuate spool motion relative to the housing. The position sensor senses an actual amount of stepper motor rotation and generates a quantity of position signals representative thereof. The controller determines a signal ratio of the quantity of the position signals to the quantity of the driver signals and generates a diagnostic signal when the signal ratio reaches a threshold value representative of a predetermined level of mechanical resistance of spool motion relative to the housing.
Abstract: An electromagnetic valve of a reduced size capable of suppressing temperature rise of a coil regardless of continuous electrical energization over an extended time while preventing attracting force from lowering includes a coil cooling fluid passage (9a; 8a; 4a) for communicating a coil cooling fluid sump space (2a) with a controlled pressure region for allowing a fluid to flow into the coil cooling fluid sump space (2a) from the controlled pressure region. The coil cooling fluid passage includes a small-diameter communicating passage portion (9a) provided so as not to exert influence to a hydraulic pressure prevailing in the controlled pressure region.
June 12, 2003
Date of Patent:
March 28, 2006
Mitsubishi Denki Kabushiki Kaisha
Hidehiro Soga, Kenji Nakao, Kouichi Ojima, Yuji Bando
Abstract: A liquid flow metering system is disclosed which includes a pump disposed between a liquid supply and a reservoir. The reservoir includes an inlet connected to the pump, an air/liquid outlet and a liquid outlet. The air/liquid outlet is connected to an air separation chamber. The liquid outlet is connected to a flow meter and a liquid outlet valve. The air separation chamber is connected to an air outlet. The air outlet is connected to an air release valve. The air separation chamber accommodates an optical sensor for sensing the presence of air in front thereof and within the air separation chamber. The optical sensor, air release valve and liquid outlet valve are all linked to a controller. When the optical sensor senses air in front of the optical sensor, the sensor sends a signal to the controller to open the air release valve and close the liquid outlet valve.
January 26, 2004
Date of Patent:
February 21, 2006
James R. Ruesch, James S. Nerstrom, Thomas T. Tschanz
Abstract: A valve assembly for an air pressure system includes an inlet valve, a first control valve, and a second control valve. The inlet valve includes an inlet port, an outlet port and a control port. The inlet valve inlet port communicates with the inlet valve outlet port when the inlet valve control port is above a threshold pressure. The first control valve includes an inlet port, an outlet port, an exhaust port, and a control member. The first control valve inlet port communicates with the inlet valve outlet port. The first control valve outlet port communicates with one of the first control valve inlet port and the first control valve exhaust port as a function of a position of the first control valve control member. The second control valve includes an inlet port, an outlet port, an exhaust port, and a control member. The second control valve inlet port communicates with the inlet valve outlet port.
Abstract: A fuel cutoff valve has a casing main body, a first float having a smaller specific gravity than a fuel, a second float having a greater specific gravity than the fuel, and a spring. The first float has a float main body and a buoyancy body of a foamed resin. The first float's specific gravity therefore is smaller than the fuel's specific gravity. The first float rises by buoyancy to close a first connection conduit, when a liquid level in a fuel tank exceeds a first liquid level. The second float rises by buoyancy and pressing of the spring to close a second connection conduit, when the liquid level exceeds a second liquid level, higher than the first liquid level. The second float lowers to open the second connection conduit, when the liquid level becomes lower than the second liquid level but is still higher than the first liquid level.
Abstract: A body element for a spool valve is provided that includes a body having an inner surface that defines an internal valving chamber having a longitudinal axis, and at least one transverse surface to the longitudinal axis. The transverse surface has at least one port comprising an annular flow passage, an intermediate flow passage and an outer flow passage extending outward from and in fluid communication with the inner surface of the internal valving chamber.
Abstract: A hydraulic control valve (1) is assigned to a pressure line (13) led from a pressure medium source to at least one load. The control valve has a first position in which the pressure line (13) is pressurized by the pressure medium source and a second position in which the load connected to the pressure line (13) is depressurized. The control valve (1) is directed toward the first position by an actuating device (17) and toward the second position by a restoring device (11). The control valve (1) has a safety function such that the pressure line (13) can be depressured to a container, irrespective of the position of the control valve (1). The safety function can be a valve function (20) integrated in a control slide (3) of the control valve (1).
Abstract: The invention concerns a hydraulic valve arrangement with a supply connection arrangement, which has a high-pressure connection (P) and a low-pressure connection (T), a working connection arrangement, which has two working connections (A, B), which can be connected with a consumer, a directional valve and a compensation valve arranged between the directional valve and the supply connection arrangement, the pressure outlet of the compensation valve being connected with a pressure inlet of the directional valve. It is endeavoured to avoid dangerous situations, which occur because of uncontrolled pressures. For this purpose, it is ensured that the compensation valve has a relief outlet, which can be connected with the pressure outlet.
Abstract: A dual inlet air gap fixture having an air gap body with first and second interior inlet conduits for receiving wastewater flow respectively from first and second identical or diverse sources of wastewater. The body has an interior outlet conduit opposite the inlet conduits for discharging wastewater emptying from either or both of the inlet conduits. A removable water reversal cap and partition module is received within the upper portion of the air gap body and provides venting communication between atmosphere and the outlet conduit, and redirects the wastewater from the inlet conduits into the outlet conduit. The inlet conduits are arrayed side-by-side on one side of the body interior space and the outlet conduit occupies the remaining interior space on the other side of space opposite from the two inlet conduits.
Abstract: An apparatus for attachment in an aperture of a fuel tank includes a cap member, a mounting portion, and a valve housing. Two or more of the cap member, the mounting portion, and the valve housing include a system of clips and catches or a system of helical threads, which attach the components together. The mounting portion may include a multi-layer laminate to reduce a fuel vapor permeation from the fuel tank. The cap member, the mounting portion, and the valve housing are attached by various steps and methods according to the invention.
Abstract: A spool valve arrangement with a cylinder is fitted with a clearance fit in a cylinder bore in a housing of the spool valve arrangement. The housing has first pressure medium ports and the cylinder has second pressure medium ports. A socket is inserted through each first pressure medium port in the housing and each second pressure medium port in the cylinder. The socket has a small diameter part, which is fitted with a clearance fit in the second pressure medium port, and a large diameter part, which is engaged with a shoulder formed in the first pressure medium port. By screwing a conduit end in the first pressure medium port, the socket is held in the mounted position, thus providing a seal of the region of this port and also providing an anti-rotation effect on the cylinder relative to the housing.
Abstract: A slide spool valve has a valve body formed by synthetic resin injection molding. The valve body includes a bore and an insert integrally coupled with the bore. The insert has a hollow portion penetrated by a port, the hollow portion being connected to the bore and having the same diameter as the bore and penetrated by one of ports. A valve room having a large diameter extends from an inner circumferential surface of the hollow portion to the penetrating portion of the port. The insert is manufactured by die casting and fixed in a metallic pattern of the valve body, so that it is integrally coupled with the valve body by insertion molding.
Abstract: A proportional, pilot-operated flow control valve is disclosed which can include a cage, a hollow compensating spool slidably disposed within the cage, a hollow metering guide member slidably disposed within the compensating spool, a regulating spool slidably disposed within the guide member, a dampening guide slidably disposed inside the compensating spool to define a dampening chamber, a compensating spring disposed inside the dampening chamber and arranged to urge the dampening guide to engage the metering guide and the compensating spool to engage the cage, a regulating spring disposed inside the regulating spool and urging the regulating spool to abut the dampening guide, and a cartridge, the cartridge having a pilot valve assembly and an adaptor, the adaptor mounted to the cage, the pilot valve assembly mounted to the adaptor, the pilot valve assembly including an actuator.
Abstract: Auxiliary manual operation on a bistable multiway valve is achieved with a valve member able to be reciprocated with the performance of a switching movement and furthermore operating device extending athwart the direction of the switching movement. There is a provision such that the operating device includes at least two mutually parallel plungers, which on operation act on second different flanks of the valve member, operation of one plunger locking the respectively other plunger.
Abstract: At least one solenoid actuator and a valve are at least partially positioned within a body of an hydraulic device. The solenoid actuator includes at least one solenoid coil mounted to a stator that defines a guide bore in which a push pin moves between a first position and a second position. The valve includes a valve member that is operably coupled to move with the push pin. The push pin is attached to an armature that is positioned adjacent the solenoid coil. In order to increase the durability of the solenoid actuator, a relatively hard, nonmagnetic material is positioned between an inner surface of the stator that is made from a relatively soft, magnetic material and an outer surface of the push pin.
February 21, 2003
Date of Patent:
November 1, 2005
Clifford E. Cotton III, Alan R. Stockner, Ronald D. Shinogle, Olaf Ohligschläger
Abstract: A device for adjusting the degree of vacuum in an apparatus for collecting substances by suction, comprising a valve that is provided with an air flow port connected to the atmosphere at one end and to a chamber at the other end, the chamber being connected to a source of vacuum and to the apparatus, and the port comprising a flow control element that is adapted to be attracted into the closed position by the action of a permanent magnet supported in the body of the valve in an adjustable position.
Abstract: A method and apparatus for removing fluid from a fluid system. The method or apparatus can include a pressure-reducing source to facilitate fluid removal. The system can be an engine cooling system or other fluid system.
Abstract: A fuel valve includes an upper chamber communicating with a ventilation passage of a canister; a lower chamber to be disposed inside a fuel tank; a communicating port between the upper chamber and the lower chamber; and a float member disposed in the lower chamber for blocking the communicating port when fuel flows into the lower chamber. The lower chamber includes a one-way valve formed at a bottom thereof for allowing the fuel to flow out only through the one-way valve, and a fuel inlet formed in a side wall of the lower chamber. When a fuel level inside the fuel tank reaches the main fuel inlet, the fuel flows into the lower chamber to raise the float member. As a result, an internal pressure of the fuel tank increases, so that a sensor at a fueling nozzle side can detect that the fuel tank is filled-up.
Abstract: An extracorporeal blood circuit is disclosed for withdrawing, filtering and returning blood from peripheral blood vessels. The blood passage in the circuit extends through a withdrawal tube connected to a catheter in a peripheral vein, a filter, one or more pressure sensors and return tube also connected to a catheter in a peripheral vein (which may or may not be the same vein as used for the withdrawal tube). The blood passage is air free, and has smooth passage walls which promoted continuous and uniform flow of the blood through the circuit.
September 9, 2004
Date of Patent:
November 8, 2005
CHF Solutions Inc.
Hans-Dietrich Polaschegg, Steven Bernard, Howard R. Levin, Mark Gelfand