Abstract: A unit for supplying fuel to an endothermal engine, the unit comprising a manifold to which injectors are connected in order to supply fuel to the engine, a high pressure pumping device which has its output connected to the manifold and its intake connected to an extraction pump adapted to transfer fuel from the storage tank to this device and a pressure regulator adapted to regulate the pressure of the fuel supplied to the pumping device by supplying surplus fuel along a bleed duct communicating with the tank, the pumping device having at least one piston moving axially within a respective cylinder in order to define a variable volume pumping chamber.

Abstract: A fuel regulator adjustment system for allowing a user of a snowmobile to specifically adjust the fuel pressure within the fuel system to a desired constant pressure. The inventive device preferably includes a pressure gauge within the fuel system, a tube removably attachable to a vacuum/boost compensation port of a conventional fuel regulator, a valve positioned within the tube, and a vacuum/boost device connected to the tube which selectively creates a vacuum or pressure within the fuel regulator. The user manipulates the vacuum/pressure device to create a vacuum in the fuel regulator if he desires to lower the fuel pressure. If the user desires to increase the fuel pressure, then the vacuum/boost device is manipulated to create pressure within the fuel regulator. After monitoring the pressure gauge to determine that the desired fuel pressure has been reached, the user then closes the valve to maintain the required vacuum or pressure within the fuel regulator.

Abstract: A supplemental regulator used with a supercharged engine, a push rod, couples to a primary regulator. One side of a diaphragm of the supplemental regulator sees boost pressure of the supercharger. The other side of the diaphragm sees atmospheric pressure and fuel pressure sensed through the primary regulator diaphragm. A push rod couples the supplemental regulator diaphragm to a primary regulator diaphragm. Boost pressure above the diaphragm increases the force on a return bypass valve of the primary regulator. The bypass valve sees intake pressure and spring force that works on the top of the standard regulator diaphragm, and fuel pressure and that acts on the bottom of the diaphragm. When the supercharger is not providing boost, vacuum exists above the supplemental diaphragm, which lifts it and uncouples the supplemental regulator from the primary regulator. The primary regulator then takes over and maintains standard fuel pressure to the engine's injectors.

Abstract: The invention relates to a quantity control valve for a fuel injection system, used in internal combustion engines, with a longitudinal slide that is movable in a valve housing between a restoring spring chamber and a control chamber and that allocates the fuel, flowing in from at least one low-pressure pump, to at least one high-pressure pump. For driving the longitudinal slide, the inflowing fuel in the control chamber is delivered past the longitudinal slide via a throttle or baffle valve. In the closing position, firstly, a cylindrical guide region of the longitudinal slide bounded on both sides by annular grooves blocks off an inlet bore. The guide region is wider than the diameter of the inlet bore. Secondly, it covers an outlet bore except for a partial intersection with the relieved annular groove shifted into the return in the opening direction of the longitudinal slide.

Abstract: The returnless regulator includes a housing having a movable diaphragm defining a portion of a fuel regulating chamber. A normally open valve receives pressurized fuel from a fuel pump and lies in communication on its opposite side with the chamber. The diaphragm includes a projection engaging a valve element for moving the valve element away from its seat and enabling increased flow of fuel from the fuel pump through the valve into the chamber in response to fuel pressure in the chamber below a predetermined fuel regulation pressure and enabling the valve member for movement toward the valve seat, thereby enabling decreased flow of fuel from the fuel pump through the valve into the chamber in response to a fuel pressure in the chamber above the predetermined fuel regulation pressure. A retainer ring has recesses registering with openings in the lower housing part in communication with the chamber for flowing fuel to the fuel rail.

Abstract: A fuel system damper includes a damper diaphragm, a damper spring, a vacuum bias diaphragm, and a vacuum bias spring. The damper spring is biased between the damper diaphragm and the vacuum bias diaphragm, and the vacuum bias spring is biased against the vacuum bias diaphragm in the top chamber of the damper. A bottom chamber below the damper diaphragm is open to allow fuel from the fuel rail into the chamber so that the damper diaphragm can respond to pressure pulsations in the fuel. The top chamber has an opening that communicates with an engine intake manifold so that when engine intake manifold pressure decreases to very low levels, the vacuum bias diaphragm will travel up. This upward motion reduces the pressure in the fuel rail by removing load from the damper spring. When the pressure regulation setpoint is reached, the regulator will supply fuel to maintain pressure.

Abstract: A fuel injection system for an internal combustion engine provides a uniform flow of gaseous and liquid fuel to each of the intake passages of the engine. A balance passage interconnects each of the intake manifolds to each other and balances the pressure within the intake passages. A pressure regulator regulates the fuel pressure at the fuel injector. A reference pressure chamber within the pressure regulator communicates with the balance passage and controls the fuel pressure based on the balanced pressure within intake passages. The balance passage also communicates with a vapor separator of the fuel supply system that separates liquid fuel from gaseous fuel. The balance passage promotes even distribution of the gaseous fuel to the intake passages. The fuel injection system also includes plenum chamber that acts a source of air for the engine. The plenum chamber includes an drain outlet that communicates with the balance passage for returning blown back fuel from the plenum chamber to the intake passages.

Abstract: A fluid metering device, for instance for a fuel supply system of a combustion engine having combustion chambers, which fluid metering device comprises at least one supply line connection (1) and at least one discharge line connection (2), the fluid metering device being provided with two sets of outlet ports (3, 4) which put the or each discharge line connection (2) into fluid communication with a fluid chamber (5), which fluid chamber (5) is put into fluid communication, via at least one inlet port (6), with the at least one supply line connection (1), a first and a second regulating plunger (7 and 8 respectively) controlling the fluid flow rate through, respectively, the first and the second set of outlet ports (3 and 4 respectively) by covering at least partly the through-flow surface of, respectively, the first and the second set of outlet ports (3 and 4 respectively), each regulating plunger (7, 8) comprising energizing means (9 and 10 respectively) of its own for controlling the respective positions of

Abstract: A retaining clip includes a cantilever arm which engages an exterior tab affixed to the outer surface of the retaining clip. The inner surface of the cantilever arm and the outer surface of the engaging tab both include a number of serrated catches. The catches are situated such that the inner surface catches of the cantilever arm are opposing the outer surface catches of the engaging tab. When the retaining clip is engaged, the serrated catches form a secure mesh. The retaining clip also includes a latch which further secures the engaged clip while also providing a means of unfastening the clip without specialized tools.

Abstract: The device has a feed pump arranged in the supply tank (12), which can be inserted through an opening (20) in the supply tank (12). The opening (20) is closed by means of a closure element (22) on which a pressure regulator is disposed, which is connected with the pressure side of the feed pump and with the internal combustion engine, and which can be connected with a relief chamber (12). The closure element (22) has a base body (30) made of plastic, in which a depression (40) has been formed, which is closed by means of an elastic diaphragm (52), so that a pressure chamber is formed. A connector (45) projects into the depression (40), which is connected with the relief chamber (12) and whose front end (51) can be closed by means of a flattened ball (74), which is movably seated in a support element (70) connected with the diaphragm (52).

Abstract: A flow control unit for controlling liquid fuel pressure supplied to a supercharged internal combustion engine fuel injector or injectors, comprising housing structure having fuel inlet and outlet ports, and a first chamber through which fuel flows in flowing to and through the ports, and through a valving port in the chamber; the housing structure also defining a second chamber spaced from the first chamber; a diaphragm assembly extending between the chambers and movable relative thereto, the assembly including a first diaphragm having a first side exposed to the first chamber, and a second diaphragm having a first side exposed to the second chamber; structure for communicating engine manifold pressure to the second diaphragm, whereby a decrease in the manifold pressure results in a reduced liquid fuel pressure delivered to the injector or injectors; and a control structure associated with the assembly to allow adjustment of the effective cross sectional area of the second diaphragm.

Abstract: The pressure-regulating valve is provided with a cap which is formed by a tubular lower part made of plastic and a cup-shaped upper part made of plastic. The lower part and the upper part partially overlap, as a result of which it is possible to modify the force of the compression spring, which acts on the upper part, by displacing the upper part Once the spring force has been set, the lower part and the upper part are fixed relative to one another. The pressure-regulating valve is particularly suitable for use in fuel supply systems.

Abstract: In one embodiment of the present invention, a "returnless" fuel system for a motor vehicle is disclosed. A "series-pass" fuel pressure regulator in the system provides fuel of a regulated pressure to a fuel rail comprising at least one fuel injector. A "bypass" fuel pressure regulator provides fuel with a regulated pressure to the series pass regulator. An in-line fuel filter is located downstream from the bypass regulator, such that only the fuel which reaches the series-pass regulator is filtered. A check valve is located downstream from the bypass regulator as well, to prevent fuel pressure bleed-down through the fuel pump and the bypass regulator. A pressure relief valve is coupled to allow fuel with a pressure above a predetermined value to flow around the check valve.

Abstract: A fuel regulating device which is fastened with a connecting fitting to a fuel housing. When the pressure regulating valve is installed on the fuel housing, the connecting fitting fits in a connecting piece provided on the fuel housing. The pressure regulating valve includes a valve housing and a connecting fitting which can be pivoted in relation to the valve housing. Because of the pivot bearing between the connecting fitting and the valve housing, considerable dimensional tolerances can be compensated for, which essentially reduces manufacture costs. The pressure regulating device is particularly suited for fuel delivery systems of vehicles with an internal combustion engine.

Abstract: A pressure control valve is made small-sized and light-weighted and assembly of parts thereof can be simplified. Diameter of an upper end of a control spring is smaller than that of a lower end thereof while a ball o which a valve body is fixed is held by a claw member. An engaging member is provided in a lower casing and is spaced from a side wall of the lower casing. A seat portion for receiving the control spring is integrally formed on a holding member and thickness of a caulked portion of an upper casing is greater than that of the other part of the upper casing.

Abstract: A flow of fuel is prevented from entering the intake manifold via the manifold vacuum passage in a fuel injection system having a source of liquid fuel under pressure in fluid communication with a least one fuel injector 28 mounted in an engine intake manifold 20 and a pressure regulator 68 having a first pressure chamber 82 in fluid communication with the source of pressurized fuel, a second pressure chamber 84 in fluid communication with the intake manifold 20, and a diaphragm 86 sealingly engaged therebetween for maintaining a predetermined pressure differential between the pressure chambers by an apparatus 78 operatively connected between the second pressure chamber 84 and the intake manifold 20 which prevents the flow of fuel from the second pressure chamber 84 to the intake manifold 20 in response to a pressure differential between the second pressure chamber 84 and the intake manifold 20 above a predetermined value.

Abstract: A no-return fuel system for an automotive engine with fuel injectors. The system has an electric fuel pump received in a fuel tank and supplying fuel at a substantially constant pressure to a demand regulator which delivers fuel to the fuel injectors under varying engine operating conditions. The fuel is delivered to the demand regulator at a substantially constant pressure by varying the speed of the fuel pump in response to changing fuel demand of the engine and/or by by-passing some of the fuel supplied by the pump through a by-pass regulator or relief valve. The demand regulator has a housing with a flexible diaphragm between first and second chambers. The admission of fuel to the first chamber is controlled by a valve associated with the diaphragm and fuel from this chamber is supplied to the engine injectors.

Abstract: An electropneumatic control valve for regeneration of a fuel absorption element by supply of air to the absorption element includes a valve comprised of a valve seat member (5) and a valve sealing member (4). The valve seat member is displaceable under the action of a pneumatic control section (2B) while the valve sealing member (4) is displaceable under the control of an electromagnetic control section (2A). The operation of the valve members (4, 5), takes place independently of one another by the respective control sections. During strong suction pressures in connector (11), valve seat member (5) is lowered and during the opening stroke of the valve sealing member (4) a minimum opening is provided whereas during low suction pressure at connector (11) the valve seat member (5) is raised and during the opening stroke of the valve sealing member (4) a maximum valve opening is produced. The valve members are slidably and guidably supported in a fixed sleeve (6) provided with calibrated openings (15).

Abstract: The present invention relates to a pressure regulator and dampener assembly which can regulate the liquid pressure and, at the same time, absorb liquid pressure pulse waves in a liquid system. The pressure regulator and dampener assembly comprises a housing and diaphragm means dividing the housing into a control chamber, a liquid chamber adjacent to the control chamber and a dampening chamber adjacent to the liquid chamber. An inlet and an outlet are used by which liquid enters and exits the liquid chamber. A valve means is mounted on the diaphragm means for controlling liquid exiting the liquid chamber. The assembly further comprises an adjusting means for controlling the valve means to move between a closed position and an open position.

Abstract: A fuel pressure regulator for an internal combustion engine fuel delivery system that includes a flexible diaphragm carried within a housing to define first and second chambers on opposed sides of the diaphragm. The first of the housing chambers includes an inlet for connection to a source of fuel under pressure, an outlet for connection to the fuel rail and fuel injectors or other fuel delivery mechanism at the engine, and a valve associated with the inlet and movable responsive to the diaphragm between open and closed positions to control flow of fuel through the first chamber to the engine. A bimetallic element is disposed within the housing coupled to the valve and responsive to temperature of fuel in the housing for positioning the valve in the open position when temperature of fuel in the first chamber reaches a preselected level.

Abstract: A fuel management system for small internal combustion engines in which metered quantities of fuel are delivered by way of a variable volume, positive displacement pump to a fuel air mixing chamber in pulses timed with the rotation of the engine.

Abstract: A fuel pressure regulator for a no-return fuel system for an automotive engine with fuel injectors having a housing with a flexible diaphragm between first and second chambers. The second chamber has a fuel inlet with a valve therein to admit fuel to the second chamber and an outlet to supply fuel to the engine. The second chamber is in continuous communication with the engine to accumulate any fuel expansion that may occur during engine deceleration or when the engine is turned off due to heating the fuel. The first chamber continuously communicates with the engine air intake manifold so that fuel is supplied to the engine fuel injectors at a substantially constant pressure drop across the injectors.

Abstract: In a fuel pressure regulator, the interior of a housing is divided into an air chamber and a fuel chamber by a diaphragm. A throttle portion is made up of a movable valve and a valve seat provided in the fuel chamber. The valve seat includes a fuel passage in communication with a fuel outflow pipe acting as an outflow passage for the fuel. The fuel passage is formed in such a shape that its cross-sectional area is gradually increased from the inlet side toward the outlet side.A valve seat holder includes an end face diposite to the movable valve, which end face is disposed on the same plane as an end face of the valve seat on the inlet side. The valve seat holder also includes a shoulder portion provided with a smoothly curved surface extending from the end face opposite to the movable valve to an outer peripheral side surface of the valve seat holder.

Abstract: A fuel pressure regulator valve for a fuel rail requires only a single conduit between the tank-mounted fuel pump and the fuel rail, thereby eliminating the need for a separate, and additional, return conduit for returning excess fuel to the tank. It does this by a spring-biased check valve in the inlet to the fuel chamber of the regulator. The check is biased to prevent flow from the pump into the fuel chamber of the regulator, but when the pressure in the rail drops below a certain level, a post on the diaphragm that separates the fuel chamber of the regulator from a control chamber of the regulator, unseats a spherical valve element in the check valve to allow pumped fuel to enter the fuel chamber of the regulator and pass into the fuel rail to the fuel injectors. When the pressure has built up beyond a certain pressure, the sphere again closes.

Abstract: A pressure regulating valve comprises a bellows formed in the shape of a bottomed cylinder, a valve seat disposed opposite to a bottom portion of the bellows, a valve body provided on an outside of the bottom portion of the bellows so as to come in and out of contact with the valve seat due to expansion and contraction of the bellows, a valve body retaining meter provided on the outside of the bottom portion of the bellows and having an engaging portion used for the engagement with an outer peripheral wall portion of the bellows, the valve body retaining member serving to retain the valve body at the bottom portion of the bellows by being fixed to the outer periphery of the bottom portion of the bellows by means of the engaging portion, and a reinforcing member provided inside of the bottom portion of the bellows and located so as to be opposite to the engaging portion through a peripheral wall portion of the bellows.

Abstract: A fluid pressure regulator of compact construction including an improved diaphragm-valve assembly interposed between a flow body and a second body cap element. The flow body has an inlet and outlet passage and a valve cavity with a centrally disposed ported valve insert to allow the regulated passage of fluid. Mounted to the flow body, the cap element confines a diaphragm of the diaphragm-valve assembly and houses an adjustable coil-spring biased against the assembly. The diaphragm-valve assembly includes a ring-shaped diaphragm element interlocated between a circular element central to the diaphragm and a diaphragm compression limiting clamp plate ring. The circular element has a central recess over the valve insert which houses a spring-backed self-aligning ball valve element having a flat chordal surface adjacent the insert.

Abstract: A fluid pressure regulator of compact construction including an improved diaphragm-valve assembly interposed between a flow body and a second body cap element. The flow body has an inlet and outlet passage and a valve cavity with a centrally disposed ported valve insert to allow the regulated passage of fluid. Mounted to the flow body, the cap element confines a diaphragm of the diaphragm-valve assembly and houses an adjustable coil-spring biased against the assembly. The diaphragm-valve assembly includes a ring-shaped diaphragm element interlocated between a circular element central to the diaphragm and a diaphragm compression limiting clamp plate ring. The circular element has a central recess over the valve insert which houses a spring-backed self-aligning ball valve element having a flat chordal surface adjacent the insert.

Abstract: The vacuum control port at the control chamber of a fuel pressure regulator is an injection molded plastic member that can be formed with an angle. A flange is provided as a seating surface for an annular seal ring. The member extends into a tube formed in the regulator control chamber and is secured thereto.

Abstract: A fuel pressure regulator with a flexible diaphragm defining in part first and second chambers in a housing and moving a ball valve in the first chamber to open and closed positions to regulate pressure of fuel discharged from the first chamber through an outlet having a seat on which the ball is received when the valve is closed. A cage carried by the diaphragm cooperates with a carrier member or disc fixed to the ball to provide a lost motion coupling between the diaphragm and the ball valve. This coupling permits movement within predetermined limits of the diaphragm generally axially, radially and pivotally relative to the ball while it remains on its seat and upon further generally axial movement of the diaphragm opens and partially closes the ball valve to regulate and maintain substantially constant the pressure of fuel discharged from the chamber over substantially the full range of the rate at which the fuel is discharged.

Abstract: A fuel distributor for supplying fuel to a plurality of fuel injection valves of the top feed type, in which the inlet and the return necks are disposed on one end of the fuel distributor, so that mounting of the fuel distributor is simplified and the space required is reduced. A connection cap having a return neck is disposed on the distributor housing, and a central pressure regulator is disposed on its face end on a second end. The pressure regulator and the return neck of the connection cap communicate with one another through a central return line extending within the distributor housing. The fuel distributor is especially suitable for fuel injection systems of mixture-compressing internal combustion engines externally supplied with ignition, for supplying fuel to a plurality of fuel injection valves.

Abstract: A fuel pressure regulator with a flexible diaphragm defining in part first and second chambers in a housing and moving a ball valve in the first chamber to open and closed positions to regulate pressure of fuel discharged from the first chamber through an outlet having a seat on which the ball is received when the valve is closed. A cage carried by the diaphragm cooperates with a carrier member or disc fixed to the ball to provide a lost motion coupling between the diaphragm and the ball valve. This coupling permits movement within predetermined limits of the diaphragm generally axially, radially and pivotally relative to the ball while it remains on its seat and upon further generally axial movement of the diaphragm open and partially closes the ball valve to regulate and maintain substantially constant the pressure of fuel discharged from the chamber over substantially the full range of the rate at which the fuel is discharged.

Abstract: A pressure sensor is provided in a fuel supply line for detecting fuel pressure for generating a pressure signal. The pressure signal is compared with a predetermined pressure value dependent on operating conditions of an engine. Amount of fuel injected into the engine is decreased when the pressure signal is higher than the predetermined pressure value, or the amount of fuel is increased when the pressure signal is lower than the predetermined pressure value for effectively preventing the engine from damaging.

Abstract: The fuel pressure regulator has a new and unique means for integrating the filter screen and axially capturing one of two O-rings seals. A crimp and a shoulder on the outlet tube unite the outlet tube, the housing, and a washer that in one embodiment performs both the function of sandwiching the filter screen between itself and the wall of the housing through which the outlet tube passes and the function of cooperating with the housing in defining the groove which captures one of the two O-ring seals. The invention offers meaningful improvements in both manufacturing and cost.

Abstract: A fuel pressure regulator has one or more fuel-injector-receiving sockets directly attached to the cylindrical sidewall of its housing such that pressurized fuel in the fuel chamber portion of the housing flows directly into the socket(s).

Abstract: A fuel pressure regulator is disposed in a socket in a fuel rail and retained therein by means of a one-piece metal retention clip which has a flat forked blade portion that is inserted through a slot in the socket sidewall to span the socket in overlying relation to a flange extending around the outside of the cylindrical body of the pressure regulator so as to capture the pressure regulator in the socket and which also has a resilient body-clasping portion in the form of a pair of opposing spring fingers that are cantilevered on and spaced axially of the flat forked blade portion by means of a joining portion of the clip and that come to resiliently embrace the body of the pressure regulator as the forked blade portion comes to span the socket.

Abstract: The fuel supply system of an internal combustion engine delivers liquid fuel to electrically operated fuel injectors by means of an electric pump whose output pressure is regulated by control electronics which receives as feedback from a pressure sensor connected into a fuel delivery passage serving the injectors a signal representing the pressure differential between manifold absolute pressure (MAP) and absolute pumped fuel pressure. The pressure sensor has a movable wall that divides its interior into an intake manifold pressure sensing chamber space communicated to the engine intake manifold and a fuel pressure sensing chamber space communicated to the fuel delivery line to the injectors. A magnet is mounted on a central region of the movable wall to transmit a signal to a Hall-effect sensor mounted within the intake manifold pressure sensing chamber space. The feedback pressure signal is derived from the Hall-effect sensor sensing the position of the magnet, and hence that of the movable wall.

Abstract: A fuel supply system for injection carburetors includes an orifice, a constant flow rate control device, and a fuel supply source and is provided with a first fuel channel circulating fuel of a predetermined flow rate, a second fuel channel branching off from the first fuel channel between the orifice and the constant flow rate control device for injecting the fuel into a suction tube of the carburetor, an air flow rate detecting device capable of detecting a flow rate of air flowing through the suction tube, and a fuel ejection control device capable of metering the flow rate of fuel to be ejected so that a pressure difference with atmospheric pressure which is detected by the air flow rate detecting device is balanced with a fuel pressure difference between the upstream side and the downstream side of the orifice.

Abstract: A manually adjustable override apparatus is connected to an existing fuel pressure regulator to alter the fuel-to-air mixture fed to fuel injectors. A T-shaped member has a lower end adapted to be connected on the vacuum hose fitting of the regulator and has an outwardly extending hose fitting. A headed plunger slidably contained in the longitudinal bore of the T-shaped member has an elongate lower end extending outwardly from the bottom of the T-shaped member and through the hose fitting of the regulator to engage the top of the diaphragm in the regulator. Vacuum communicates around the plunger between the interior of the T-shaped member and the vacuum chamber of the regulator. An adjustment screw in the top end of the T-shaped member engages a small piston slidably and sealably contained in the longitudinal bore. A compression spring is biased between the piston and the head of the plunger. The vacuum hose is removed from the regulator and the override device is installed on the existing regulator.

Abstract: Fuel rail assemblies for supplying fuel to injectors of internal combustion engines include mounting structure to integrally mount a fuel pressure regulator. An annular chamber, in fluid communication with the fuel passageway of the fuel rail, is defined between a mounting section of the fuel rail and a lower housing portion of the regulator. Apertures in the lower fuel rail housing portion thus allow fuel to flow into the regulating chamber of the fuel regulator from the defined annular chamber. In some preferred embodiments, the integral mounting structure includes a mounting cup having an upper cup section and a lower tail section for receiving a fuel pressure regulating and thus regulate upstream fuel pressure within the fuel rails. Fluid communication is established between the fuel rail and the cup section of the mounting cup while fluid isolation between the cup and tail sections of the mounting cup is established by suitable seal structures.

Abstract: A digital fuel control system for a small internal combustion engine having a pressure sensor for detecting the instantaneous pressure in the air intake manifold of the engine to generate air pressure data. A microprocessor responsive to the air pressure data generates a fuel quantity output signal indicative of the quantity of fuel to be delivered to the engine. A fuel metering apparatus responsive to the fuel quantity output signal generated by the microprocessor meters the fuel being delivered to a fuel delivery mechanism which delivers the fuel into the air intake manifold of the engine. The microprocessor in response to the air pressure data generated by the pressure sensor determines the engine's speed and the average pressure of the air inhaled by the engine. The engine speed data and air pressure data address a look-up table to extract data indicative of the fuel requirements of the engine.

Abstract: A fuel pressure regulator valve comprises a housing constructed from plural metal stampings and containing a diaphragm assembly which divides the housing into a control chamber and a fuel chamber. The housing is shaped to contain integral grooves for O-ring seals so that the O-rings stay on the valve when it is removed from its mounting socket in a fuel rail. Two of the stampings partially define the fuel chamber and are joined by means of a crimp formed in one. The other of the two has a hardness greater than that of the one to facilitate its press-fit engagement with the valve seat tube. The crimp is below the upper O-ring seal so that the crimp provides an entirely satisfactory joint. Each O-ring is located within its groove with the aid of a spacer also disposed in the groove.

Abstract: A pressure control valve suitable for liquid or gaseous media with a short force conduction path is to be created, permiting the use of plastic as a material for the housing. The pressure control valve has a chamber carrying the medium, which is formed by a housing element and a diaphragm. A seat valve located in the chamber has a valve closing element secured to the diaphragm. A prestressed spring disposed in the chamber at least indirectly engages the housing part on one side and the valve closing element on the other. The spring acting as a tension spring is in the form of an annular washer and occupies little space. The pressure control valve is intended for liquid or gaseous media, and in particular for use in fuel injection systems of internal combustion engines.

Abstract: A two-stroke engine having an intake valve and an exhaust valve arranged on an inner wall of the cylinder head, an intake passage connected to the cylinder via the intake valve, a fuel injection device arranged in the cylinder, for injecting fuel into the cylinder, a pressure regulator for regulating a fuel pressure supplied to the fuel injection device on the basis of a scavenging pressure in the intake passage, to thereby increase the fuel pressure in accordance with an increase of the scavenging pressure, and a control device for controlling the injection of fuel by the fuel injection device for a time ranging from a time at which the intake valve is opened to a time at which the scavenging pressure becomes equal to a pressure in the cylinder after the intake valve is closed.

Abstract: A fuel supply system for injection carburetors includes an orifice, a constant flow rate control device, and a fuel supply source and is provided with a first fuel channel circulating fuel of a predetermined flow rate, a second fuel channel branching off from the first fuel channel between the orifice and the constant flow rate control device for injecting the fuel into a suction tube of the carburetor, an air flow rate detecting device capable of detecting a flow rate of air flowing through the suction tube, and a fuel ejection control device capable of metering the flow rate of fuel to be ejected so that a pressure difference with atmospheric pressure which is detected by the air flow rate detecting device is balanced with a fuel pressure difference between the upstream side and the downstream side of the orifice.

Abstract: The device comprises a housing formed by a cup-shaped body and a bell-shaped cover secured to the body, a deformable membrane secured to the housing and forming, together with the body, a chamber for the fuel, a movable shutter member designed to bring the chamber into communication with an outlet opening; the device is characterized in that at least one hole is provided in the base wall of the body for the inlet of the fuel into the chamber and a bearing seat for a sealing ring arranged so that it can be interposed between the seat and a corresponding seat of a housing in which the lateral wall of the body is inserted is provided on the lateral wall of the body.

Abstract: A pressure regulator device which enables greater coaxiality tolerances in the individual parts, without impairing the ability to assemble the parts or impairing a necessary tight sealing. The pressure regulator valve is disposed in a guide opening of a fuel distributor line and a receiving opening of an outlet connection. The pressure regulator valve has a bottom part and an outlet neck. An annular neck groove is embodied on the outlet neck and an annular housing groove is embodied on the bottom part. A sealing ring is disposed in each groove. The annular neck groove is defined by an outer shoulder and an inner shoulder, which has a smaller diameter than the outer shoulder. In the same way, the annular housing groove is defined by an outer shoulder and an inner shoulder, which has a smaller diameter than the outer shoulder. The outer shoulders of each groove allow centering of the pressure regulator valve while the inner shoulders allow concentricity errors.

Abstract: A pressure regulating device is proposed which regulates the fuel pressure in a fuel injection system for internal combustion engines. The pressure regulating device includes a pressure regulating valve which has a valve diaphragm fastened in a valve housing and arranged to define a fuel chamber which communicates via inlet pipes with a fuel distributor line. Protruding into the fuel chamber is a valve seat body joined to the valve housing, on one end of which body a valve seat is formed and the other end of which engages an outlet conduit which protrudes through the wall of the fuel distributor line remote from the pressure regulating valve and is tightly joined to this wall.

Abstract: Fuel rail assemblies for supplying fuel to injectors of internal combustion engines include mounting structure to integrally mount a fuel pressure regulator. An annular chamber, in fluid communication with the fuel passageway of the fuel rail, is defined between a mounting section of the fuel rail and a lower housing portion of the regulator. Apertures in the lower fuel rail housing portion thus allow fuel to flow into the regulating chamber of the fuel regulator from the defined annular chamber. In some preferred embodiments, the integral mounting structure includes a mounting cup having an upper cup section and a lower tail section for receiving a fuel pressure regulator and thus regulating upstream fuel pressure within the fuel rails. Fluid communication is established between the fuel rail and the cup section of the mounting cup while fluid isolation between the cup and tail sections of the mounting cup is established by suitable seal structures.

Abstract: The fuel injection device for injection carburetors comprises a slow fuel control unit consisting of an air pressure regulator and a fuel pressure regulator, and a main fuel control unit consisting of another air pressure regulator and another fuel pressure regulator. The slow fuel control unit and the main fuel control unit have a common fuel feeding passage, and the former fuel control unit is arranged at a location downstream the latter fuel control unit. This feel injection device has a broad control range and high control accuracy, is manufacturable at a low cost and is capable of maintaining initial performance thereof for a long term.

Abstract: The fuel injection system for injection carburetors is provided with an air section of regulator and a fuel section of regulator which are arranged opposedly to each other on both the sides of a suction tube, and a connecting member equipped with a fuel injection valve for controlling fuel injection from the fuel section of regulator into the suction tube. The air section of regulator comprises a depression chamber and an air chamber which are separated from each other by a diaphragm, whereas the fuel section of regulator comprises a fuel chamber and a fuel injection chamber which are separated from each other by another diaphragm and communicated with each other through an orifice. The depression chamber is so adapted as to receive negative pressure from a venturi in the suction tube. The connecting member is connected between said two diaphragms and is urged so as to close the fuel injection port with the fuel injection valve.