Abstract: Combination of a float valve for venting a fuel tank allowing venting in the inclined position, preventing the ejection of liquid, fulfilling the OPD and ROV functions and the function of degassing during filling, and of a capacity equipped with a draining system capable of trapping small quantities of liquid fuel entrained with the gases and of returning them to the tank.

Abstract: System for the venting of a liquid tank, comprising a float valve, arranged in the tank, in communication with a pipe forming one end of a venting circuit, and a closed volume internal to the tank and provided with an emptying device, the closed volume functioning as a capacity intended for collecting any possible entrainments of liquid coming from the tank, the valve being located outside the volume of the capacity and being connected to the latter by means of the pipe of the venting circuit.

Abstract: A fuel expansion device for a vehicle fuel tank, the device comprising a housing formed of a first housing member and a second housing member, both made of an essentially impermeable material and being sealingly and impermeably attached to one another. At least one inlet port for fuel fluid ingress is formed in the first member and is in flow communication with the fuel tank, and an outlet port is formed in the second member connectable to a fuel fluid handling device.

Abstract: A high flow rate, two stage fuel vapor vent valve assembly utilizing two float valves that provide a progressive closing of a vapor outlet to control the venting of fuel vapors from a fuel tank and the addition of liquid fuel to the tank. A first float closes a portion of the vapor outlet in response to liquid fuel at a first level relative to the valve. A second float closes the remainder of the vapor outlet in response to liquid fuel at a second level higher than the first level. One or more separate baffles are constructed and arranged to prevent the escape of liquid fuel through the vapor outlet.

Abstract: A fuel tank T has a seal member 18 provided at a fuel entry port 16 provided at an upper end of a filler pipe 12 extending continuously to a tank main body 11 for sealing the outer circumference of a nozzle of a fuel filling gun G. A first relief valve 27 and a second relief valve 29 which are adapted to open when the internal pressure of the filler pipe 12 reaches or exceeds a predetermined value are provided along a first relief passage 26 and a second relief passage 28, respectively, which continuously extend to the filler pipe 12. When excessive fuelling occurs, the first relief valve 27 is made to open so that fuel inside the filler pipe 12 is allowed to be discharged to the outside thereof, and the second relief valve 29 is made to open so that part of fuel inside the filler pipe 12 is allowed to flow out into the fuel entry port 16 located above the seal member so as to inform the operator of a fuel filling pump of the occurrence of an abnormal situation to thereby prompt him or her to stop fueling.

Abstract: The invention concerns a ventilating device for a motor vehicle fuel tank, wherein a valve (12) is provided with a counter-weight (22) which, when the vehicle is not running in a substantially horizontal position, causes the valve (12) to be closed, and which, when the vehicle is running, causes the valve (12) to open. The invention is characterised in that the counter-weight (22) is supported on the upper concave surface (24) of a spring retainer (20) whereof one lower surface comprises means for closing the valve (12), and when the counter-weight (22) is spaced from its stable equilibrium position by vibrations, it makes the spring retainer (20) tilt so as to cause the valve (12) to be opened.

Abstract: A strategy for decreasing hydrocarbon emissions from a plastic fuel tank assembly having a multilayer plastic fuel tank (10) and at least one overmolded fuel tank attachment (100). The strategy consists of two basic components. First, the swelling properties of the overmolded outerlayer (116) of the fuel tank attachments 100 are exploited to close possible leakage paths between the barrier resistant core (101) and the overmolded outerlayer (116) of the fuel tank attachment (100). Second, the barrier properties of the barrier resistant core (101) of the fuel tank attachments (100) are exploited to increase the length of the diffusion path of hydrocarbon molecules out of the multilayer plastic fuel tank assembly.

Abstract: A fuel cutoff valve is mounted on an upper wall of a fuel tank to open and close a connection conduit, so as to connect and disconnect the fuel tank with and from outside. The fuel cutoff valve of the present invention includes a casing, a cup-shaped float, a bottom plate, and a cover. Both the cover and the casing swell in the liquid fuel. The cover is made of a first resin material, which has the greater fuel swelling property than a second resin material that is applied for the casing. The cover is accordingly expanded to a greater degree than the casing. A holder unit disposed on the casing increases the supporting force against a support member of the cover with the swell of the cover. The casing is thus securely held by the cover via the holder unit and is not movable against the cover under the swelling condition of the cover.

Abstract: A fuel vapor control apparatus on a motor vehicle fuel tank including a vapor storage canister, a plurality of vent valves on the fuel tank, a plurality of vapor ducts between the vent valves and the vapor storage canister, a plurality of primary liquid traps, and a secondary liquid trap which cooperates with the primary liquid traps in preventing liquid fuel leaking through the vent valves from reaching and contaminating the vapor storage canister. The primary liquid traps are segments of respective ones of the vapor ducts defining standpipes above corresponding ones of the vent valves when the fuel tank is inclined. The primary liquid traps retain liquid fuel leaking through the vent valves and drain by gravity to the fuel tank when the incline of the fuel tank is reduced to zero. The secondary liquid trap is a secondary tank on the top of the fuel tank interposed between the vapor storage canister and the segments of the vapor ducts defining the standpipes.

Abstract: A roll over valve adapted for use in an evaporative gas control device for vehicles to simplify the structure thereof and to enable an accurate fuel fill-up, the roll over valve comprising: a hollow housing fixed at an upper end of a fuel tank and formed with a service pipe in order to cut off fuel gas; an outlet pipe fixedly disposed on the housing for connection to the housing and for connection again to a canister; a ball case for being liftably mounted in the housing for fuel and gas to pass therethrough and for being disposed with the outlet pipe arranged therethrough; a circular moving part for being formed at a bottom surface of the ball case to hold a ball therein; a sealing pad disposed on the moving part to shield the outlet pipe when the ball case is lifted; and a tensile spring provided between the ball case and the housing to apply an upward resilience to the ball case.

Abstract: A vapor control valve includes first, second, and third valves and a housing formed to include first, second, and third chambers and first, second, and third apertures. The first valve is formed to include a vent aperture and is movable relative to the first aperture to partially close the first aperture to limit flow from the first chamber to the second chamber through the first aperture. The second valve is movable relative to the first valve to open and close the vent aperture and cooperates with the first valve to close the first aperture to prohibit flow from the first chamber to the second chamber through the first aperture in response to rising liquid fuel. The third valve is biased to normally close the third aperture and configured to open the third aperture in response to pressurized fuel vapor to permit flow from the second chamber to the third chamber through the third aperture.

Abstract: Safety valve for venting a liquid tank, comprising means for ventilating the tank, including when the latter is inclined, for preventing liquid from being ejected if the tank is inclined or if waves of liquid are produced, for automatically closing in the event of inversion, for adjusting the useful volume and for allowing gas to escape during filling. As a preference, it also comprises means for ventilating it in the event of a depression or overpressure. The valve is characterized in that a flexible seal equips the seat of a valve element. As a preference, the head of the valve also comprises means for preventing dirt from getting into the tank. The valve is well suited to fuel tanks for diesel-engine motor cars.

Abstract: A refueling fuel level responsive control valve with a two-stage closing operation providing an initial soft shutoff cue to the filler nozzle operator, and a subsequent final shutoff after a limited amount of “roundoff” filling to a maximum fuel level. The control valve includes two float-operated valve elements which dose serially in response to initial shutoff and final shutoff refueling fuel levels. The initial shutoff partially closes the control valve to create a temporary shutoff-inducing increase in fuel tank pressure. Final shutoff occurs after allowing a few round-off “clicks” of the filler nozzle to fully close venting through the control valve.

Abstract: An apparatus for controlling the discharge of fuel vapor and liquid fuel through an aperture formed in a fuel tank, comprising a housing adapted to be mounted in an aperture formed in a fuel tank and being formed to include a venting outlet, a valve positioned to lie in the housing and move between an opened position allowing flow of fuel vapor through the venting outlet formed in the housing and a closed position preventing flow of fuel vapor and liquid fuel through the venting outlet, and a valve actuator including a fluid actuator valve mover in the housing and an electronic liquid detector coupled to the valve mover, arranged to move the valve between the closed position and the opened position, the electronic liquid detector including a valve mover controller coupled to the valve mover to control fluid at said fluid actuated valve mover and an electronic liquid sensor coupled to the valve mover controller and positioned to lie in a fixed position relative to the housing to sense the presence of liquid fu

Abstract: Apparatus is disclosed for venting a fuel tank including a canister containing an absorbent for fuel fumes, a sensor for detecting the filling of the fuel tank and emitting a signal based thereon, a first connection line for connecting the canister with the fuel tank and having a sufficient size to permit the free flow of gases from the fuel tank during filling of the fuel tank, the first connection line including a first valve operable between an open position and a closed position, the first valve normally being in the closed position and being actuatable into the open position by the signal thereby permitting the free flow of gas from the fuel tank through the first connection line during filling, a second connection line for connecting the canister with the fuel tank and connected to the first connection line between the first valve and the canister, the second connection line including a second valve including at least one restrictor for substantially limiting the flow of gases therethrough as compared t

Abstract: An apparatus is provided for controlling discharge of fuel vapor from within a vehicle fuel tank. The apparatus includes a valve container with an inlet, an outlet, and a chamber, a valve member formed for movement between an open position allowing fuel vapor flow through outlet and a closed position blocking fuel vapor flow through outlet, and a secondary float valve disposed between inlet and valve member. The valve member includes a central post and wing segments defining flow passages sized to permit fuel vapor flow therethrough and to block momentarily liquid fuel flow therethrough. The secondary float valve moves between an open position allowing fuel vapor flow to the wing segments and a closed position blocking liquid fuel flow to the wing segments.

Abstract: A refueling valve for a motor vehicle includes a body connected to the upper wall of a fuel tank in vertical depending relationship thereon and the body has a body top or cover with a vapor exit passage adapted to be connected to a fuel vapor storage canister, a baffle is connected to the valve body intermediate the ends thereof to form a fuel space and a vapor space; the body includes a portion depending from the cover that has a vapor exit port communicating with the vapor space and wherein the vent exit port has a valve seat closed by a valve mounted on one end of a connecting rod that has its opposite end connected to a float within the fuel space and wherein the vapor exit port remains open until the fuel tank is filled and/or fuel slosh in the tank raises the float to close the valve; the connecting rod is directed through a port in the baffle to provide for vapor exhaust across the baffle during tank fill and to restrict fuel bypass into the vapor space during fuel slosh within the tank.

Abstract: A high flow rate fuel vapor vent valve assembly has a delayed fall away fill level control float responsive to the level of fuel in the fuel tank and constructed to control the closing of an outlet passage through which fuel vapors are vented from the fuel tank when a desired maximum fuel level is reached within the fuel tank during refueling of the tank. The fill level float is constructed to sink after refueling of the fuel tank is completed, and preferably several minutes thereafter, to control the opening of the outlet passage and permit fuel vapors to once again vent from the fuel tank. Staggered openings in the housing of the valve assembly permit the fuel vapor to vent from the fuel tank through the outlet passage when it is open but prevent splashing or sloshing fuel within the fuel tank from flowing through the outlet passage and to a vapor canister downstream of the outlet passage.

Abstract: A vent valve assembly with roll over shut-off capability includes a housing, a vent valve that opens to allow vapor to escape from the tank in response to tank vapor pressure greater than a predetermined positive pressure and that opens to allow air or vapor entrance to the tank in response to tank vapor pressure below a predetermined negative pressure. A roll over valve is provided to open and close the fluid flow path between the vent valve and the tank interior, and a rocker arm assembly is rotatably mounted to the housing for positioning the roll over valve in the open position when the tanker is upright and for moving the roll over valve to the closed position when the tanker rolls more than a predetermined angle relative to the upright position. Stored liquid rising above the shut-off valve applies a further force closing the shut-off valve in relation to the head pressure.

Abstract: A fuel tank venting arrangement for a vehicle comprises a fuel tank (2) including at least two vent ports in its upper surface. Each vent port is provided with a rollover valve (4) and is in fluid flow communication with a back pressure control valve (12). The vent ports are connected together by a single manifold (16) which is secured to the tank (2) to form a fluid-tight seal.

Abstract: The invention is directed toward a float arrangement for liquid tanks in a housing with a cylindrical or prismatic cavity, one or more inflow openings being disposed at the bottom of the cavity and there being arranged at the top thereof at least one outlet opening that can be closed by the top of the float; according to the invention, disposed at the top and the bottom of the float are guiding elements of reduced cross section, extending approximately coaxially with the longitudinal axis thereof and cooperating with counterparts at the top or the bottom of the cavity.

Abstract: A two-stage venting on-board refueling vapor recovery (ORVR) valve for controlling fuel tank venting to a storage canister during tank filling. A float actuated poppet has a small second stage venting hole therethrough. The poppet is mounted for relative movement with respect to a second stage vent valve member disposed on the float. During tank filling, venting is through a first stage relatively large flow area passage until rising fuel level causes the poppet to close the first stage vent flow area. Venting during continued filling is through the second stage venting hole in the poppet. After first stage valve closure relative movement or lost motion occurs between the first and second stage valve members.

Abstract: A refueling fuel level responsive control valve with a two-stage closing operation providing an initial soft shutoff cue to the filler nozzle operator, and a subsequent final shutoff after a limited amount of "roundoff" filling to a maximum fuel level. The control valve includes two float-operated valve elements which close serially in response to initial shutoff and final shutoff refueling fuel levels. The initial shutoff partially closes the control valve to create a temporary shutoff-inducing increase in fuel tank pressure. Final shutoff occurs after allowing a few round-off "clicks" of the filler nozzle to fully close venting through the control valve.

Abstract: A fuel cut device has a body in which a gas vent passage having a plurality of ports is formed. A connecting portion is formed around one of the ports in a laterally oriented manner for fixing a separate two-way valve onto the fuel cut device. A plurality of thus-configured fuel cut devices are mounted within a fuel tank. The fuel cut devices are mutually connected by means of pipes fitted into the corresponding ports. Unused ports are plugged. The two-way valve is connected to the connecting portion of the fuel cut device adapted to communicate with an external device. The pipes used to connect the fuel cut devices does not include a connection or a branch.

Abstract: A fuel vapor control apparatus halts deterioration in operating characteristics of a fuel control valve at the time of fuel supply and prevents fuel vapor from being discharged into the atmosphere through a filler pipe. The fuel vapor control apparatus prohibits fuel vapor from flowing toward a filler pipe by closing a fuel drop passage at the time of fuel supply. A fuel vapor control valve is configured as a diaphragm valve made of a flexible material, and a diaphragm holder moving integrally with the diaphragm valve is provided at the center thereof. Furthermore, the fuel drop passage as a communication hole is formed in the diaphragm portion at a location radially outward of the diaphragm holder, which is provided with an umbrella portion for opening and closing the fuel drop passage.

Abstract: A refueling valve for a motor vehicle includes a body connected to the upper wall of a fuel tank in vertical depending relationship. The body has a cover with a vapor exit passage adapted to be connected to a fuel vapor storage canister and a portion depending from the cover that has a vapor exit port that communicates with the fuel tank interior adjacent the upper wall of the fuel tank. A vent tube has one end connected to the vapor exit passage and an opposite end that communicates with the vent exit port and defines a valve seat. The vapor exit port is located with respect to the valve seat so as to separate liquid fuel particles from vapor flow during fuel fill. The valve seat is closed by a float valve when the fuel tank is full.

Abstract: An apparatus is provided that includes a valve container with a vapor inlet adapted for communicating with an interior region of the fuel tank and a vapor outlet, a baffle including an upper end coupled to the vapor inlet, an open lower end spaced-apart from the upper end, and a skirt extending between the upper and lower ends, and a float valve disposed in the valve container and movable between an opened position allowing flow of fuel vapor through the vapor outlet and a closed position preventing flow of fuel vapor through the vapor outlet. The skirt of the baffle includes at least one slot therethrough and the float valve is positioned to lie between the vapor inlet and the slot of the baffle when in both the opened and closed positions.

Abstract: An improved weldable vapor vent valve assembly comprising a non-weldable (heat-resistant) valve body and a weldable connector portion attached to an upper end of the valve body for welding onto the outer surface of a polymeric fuel tank. The weldable connector portion secures the valve body in place using vertical anti-leak ribs extending downwardly from the weldable connector and upwardly from the valve body which mate axially in an interlocking, sealing fit. The anti-leak ribs form a labyrinth-type seal that prevents liquid fuel and fuel vapor from leaking between the assembled portions of the vent valve assembly.

Abstract: A control valve for an onboard refuel vapor recovery system employing two bleed orifices in the body of the control valve that are effective to provide different time intervals for continuing to dispense fuel into the fuel tank after an initial fill nozzle shut-off.

Abstract: A valve device is adapted to be provided on top of a container (1) to prevent the flow of a liquid from said container. Said container may form a part of a cleaning device. The valve device comprises a passage (10) extending in a direction (x) being essentially vertical when the valve device is in a normal working position and having an orifice (11) at one end. The orifice is surrounded by a surface (14). Moreover, the valve device comprises a disk (15) having a disk diameter exceeding the diameter of said orifice and support means (17, 18) to support the disk (15) beneath said orifice (11) at a distance from said surface such that the disk is movable to abut said surface when said direction (x) deviates from said vertical direction by a predetermined angle.

Abstract: A differential pressure regulating valve is disclosed which improves sealing performance when the valve closes. The differential pressure regulating valve has a diaphragm and a guide. The guide limits the moving direction of a retainer. A projecting part and an engaging hole engage with one another and reduce deformation of the diaphragm by tolerating a relative movement between the diaphragm and the retainer. A liquid shut-off valve device is also disclosed which incorporates the differential pressure regulating valve and has stable operating characteristics.

Abstract: A combination fuel tank rollover valve, float actuated fill vent shutoff and tank vapor pressure relief valve assembly in a common housing for assembly into a single access opening in the tank. A header containing the pressure relief valve is sealed over the tank access opening and has an extension member attached to the undersurface of the header with an extension neck extending through the access opening. An interchangeable vent float valve subassembly is attached to the end of the neck before attachment of the extension to the header and assembly on the tank. Tanks of different depth can be accommodated simply by using extension members having a correspondingly different length necks, while the float valve subassembly and header are interchangeable.

Abstract: A fuel vapor vent valve for a motor vehicle is connected to an upper wall of a fuel tank in vertically depending relationship. The valve has a cover with a vapor exit passage connected to a fuel vapor storage canister and a body depending from the cover. One embodiment has a vapor exit port that communicates with the fuel tank interior adjacent the upper wall of the fuel tank. A vent tube has one end connected to the vapor exit passage and an opposite end that communicates with the vent exit port and defines a valve seat. The vapor exit port is located with respect to the valve seat so as to separate liquid fuel particles from vapor flow during fuel fill. The valve seat is closed by a valve element attached to a float when the fuel tank is full. Several further embodiments of the valve have the body connected to the cover to accommodate side impacts to the fuel tank.

Abstract: An onboard vapor recovery system for a vehicle fuel system having a fuel tank, a filler neck dynamically sealed by high pressure fuel flow from a filler nozzle, and a vapor recovery apparatus such as a carbon canister. The system includes a liquid level operated control valve which shuts off refueling with a two-stage closing operation providing an initial soft shutoff and a final shutoff. The system also preferably includes a valve in the fuel tank to maintain a predetermined pressure head sufficient to hold the system closed against further refueling at least temporarily, and a positive action, one-way check valve in the lower end of the filler pipe to prevent spitback of fuel from the pressurized tank once refueling has ceased.

Abstract: A vent valve for a gasoline tank has a multi-piece valve housing that is inserted into the tank through a tank wall opening. The housing includes a valve member and a cap member that has a flange that is ultrasonically welded to the gasoline tank and a coupling skirt that has minimal protrusion into the gas tank. The coupling skirt fits into upper portion of the valve member and has keyways that receive inwardly projecting lugs of the valve member to couple the valve and cap members to each other. The valve and cap members are retained in the coupled position by resilent cantilevered lock fingers of the valve member that engage notches in the bottom of the coupling skirt. In a modification the notches coincide with entrance portions of the keyways. The cap member of a second embodiment has a coupling skirt with keyways that fit over an upper portion of the valve member that has outwardly projecting lugs and resilient lock fingers that are cut out of the wall of the valve member.

Abstract: A safety valve for a circuit for ventilating a liquid tank, preventing liquid from being entrained and comprising a casing which opens out inside the tank under the upper wall of the latter and the upper part of which is connected to the ventilating circuit by means of an orifice, including:a) a needle capable, in the high position, of shutting off the orifice located in the head of the valve;b) a float associated with the needle and capable of sliding vertically inside the casing;c) structure for supporting the float and for displacing the said float upwards in the event of an inclination of the casing;d) a stem extending the lower part of the casing inside the tank under the means for supporting and displacing the float.

Abstract: A tank filling and pressure relief assembly. A cover member has a seat for sealingly closing the tank opening. A stem is attached at one end to a piston in a cylinder (which is attached to the cover member and extends downwardly therefrom into the tank) and at the other end to a strongback. The strongback is pivotly mounted to swing the assembly away from the opening for filling thereof and to swing the assembly back into position to seat the cover member and is lockable in a position to lockingly urge the cover member to the closed position. The stem is flexibly coupled to the strongback to evenly distribute the seating force so that binding does not occur and is threadedly attached thereto so that the set pressure for pressure relief may be adjusted by access to the stem for turning thereof through an opening or cut-out in the strongback.

Abstract: A fuel level responsive vent valve assembly adaptable to a variety of different mounting requirements in a vehicle fuel tank. In general, the vent valve assembly comprises a standard, valve body, a top cover adapted to mate with the standard valve body at a vent outlet interface for a sealed vapor venting connection, and separately formed longitudinal connector means having a preassembly end for preassembly to a standard interface on the lower surface of the top cover, and an assembly end for longitudinally locking the standard valve body to the top cover. The standard assembly end of the longitudinal connectors can be varied in length to accommodate different valve height mounting requirements in different fuel tank applications. In a preferred embodiment the longitudinal connectors comprise metal pins or rods which can be pre-formed or cut to length to accommodate the standard valve body at different distances from the top cover.

Abstract: A vehicle on board system for recovering fuel vapors from the fuel tank both during filling of the fuel tank with volatile hydrocarbon liquid fuel and operation of the vehicle engine. A control unit in the fuel tank has a valve assembly actuated by a float to control the flow of fuel vapors from the top of the tank into a receiving canister with activated charcoal for absorbing the fuel vapors which can be purged from the canister by operation of the engine. The valve assembly has a valve seat, a flexible elastomeric closure received on a pivotally mounted carrier plate movable to open and closed positions relative to the seat, and a stripper plate encompassing the seat, overlying the closure and pivotally movable by the float to disengage the closure from the seat to open the valve.

Abstract: A vent valve for a gasoline tank has a multi-piece valve housing that is inserted into the tank through a tank wall opening. The multi-piece housing includes a valve member of acetal resin and a cap member of high density polyethylene (HDPE) that has a flange that is ultrasonically welded to the gasoline tank and a coupling skirt that has minimal protrusion into the gas tank. The coupling skirt fits into upper a portion of the valve member and has a plurality of key-ways that receive inwardly projecting lugs of the valve member to couple the valve and cap members to each other. The valve and cap members are retained in the coupled position by resilient lock fingers of the valve member that engage notches in the bottom of the coupling skirt. The resilient lock fingers are cantilever beams that extend radially outwardly from an anchor spaced radially inwardly of an outer cylindrical wall of the valve member.

Abstract: A liquid flow-out prevention valve is basically formed of a cut-off valve and a relief valve attached to the cut-off valve. The cut-off valve includes a housing having an outlet in an upper wall, and a valve body disposed inside the housing to open and close the outlet. A flow path communicating with the outlet extends from above the upper wall to a side wall of the cut-off valve. The relief valve includes a valve portion formed in the flow path at a side of the side wall, and an inlet communicating with the flow path and opened and closed by the valve portion. The inlet is disposed above a liquid level of the cut-off valve in a fuel tank and is arranged to open upwardly. The liquid flow-out prevention valve can be made compact and operate reliably.

Abstract: In a two piece valve assembly comprising a non-weldable lower valve body portion inserted into the fuel tank through an opening in the tank wall, and an upper valve body portion or cover made from a weldable material and designed to be connected to the lower valve body portion and welded to the upper surface of the fuel tank wall, an improved assembly structure comprising a plurality of circumferentially-spaced support/retention tabs formed on the upper end of the lower valve body portion to provide a self-supporting option for the lower valve body so that it may rest with the tabs on the upper surface of the fuel tank when inserted into the fuel tank opening, and/or further to be securely sandwiched between the upper valve body/cover and the upper surface of the fuel tank wall when a weldable portion of the cover is welded to the tank and melts over the tabs, thereby strengthening the connection between the upper and lower valve body portions.

Abstract: An improved apparatus and method for calibrating a float-type vent valve for use in an automobile fuel tank. The valve is provided with a calibration plate in the lower end thereof below the float, the calibration plate defining an axially-adjustable support for the spring which balances the float. The calibration plate includes a force probe aperture through which a force measuring device of known type can be inserted to measure the downward force of the spring-balanced float at a specified distance from closure, preferably a near-closed position. The calibration plate then is adjusted up or down as needed until a position is determined where the spring-balanced float is properly calibrated, and then the calibration plate is permanently secured in place on the valve body so that the valve remains calibrated.

Abstract: An onboard refueling vapor recovery (ORVR) system for a vehicle fuel system having a fuel tank, a mechanically sealed filler neck which receives a filler nozzle, and a vapor recovery apparatus such as a carbon canister. The system includes a nozzle shutoff line connecting the fuel tank with the filler neck to trigger the automatic shutoff mechanism of the filler nozzle when the level of fuel in the tank reaches a predetermined level. The system also includes a liquid-responsive control valve permitting venting of fuel vapor from the tank during both refueling and normal vehicle operating states when the fuel level in the tank is at or below the full level established by the nozzle shutoff line.

Abstract: A fuel vapor vent valve assembly for a vehicle fuel tank for venting fuel vapor from the fuel tank to a fuel vapor emission device disposed external of the fuel tank, wherein the assembly comprises a valve housing having a fuel vapor vent outlet opening or orifice defined by a valve seat and communicating with a fuel tank vapor space interior of the fuel tank and with a fuel vapor emission device, such as a charcoal canister, exterior of the fuel tank. A fuel level responsive valve-moving device, such as a float, is disposed in the housing for movement therein. A vapor vent valve is disposed on the device in a manner for closing and opening the vent orifice in response to the fuel level in the fuel tank. The vent valve includes a partial spherical, radius-defined sealing surface that mates with a sealing surface of the valve seat to provide liquid/vapor tight sealing relation therebetween when the valve is in the closed position relative to the valve seat.

Abstract: An apparatus includes a valve container and a valve member. The valve container is formed to include an inlet in fluid communication with a fuel tank, an outlet, a side wall extending between the inlet and outlet, and a chamber in fluid communication with the inlet and the outlet. The valve member is disposed in the chamber and includes a central post and wing segments positioned to lie in a spaced apart relationship about the post. The wing segments are formed to define flow passages therethrough that are sized to permit the flow of fuel vapor therethrough and to momentarily block the flow of liquid fuel therethrough.

Abstract: In a fuel tank for motor vehicles including a tank vent with a venting valve, which automatically closes when the fuel in the tank reaches a predetermined level and when the vehicle is in an upside down position, the venting valve includes a vent closing member and a float structure engaging to the vent closing member and having a buoyancy, which is variable depending on the amount of fuel contained in the tank.

Abstract: A liquid cutoff valve unit provided for a sealed container in which a liquid fills comprises a discharge passage formed to an upper portion of the sealed container in a used state and adapted to discharge the gas therein, a float valve moving in accordance with a buoyancy so as to open or close the discharge passage, a float chamber in which the float valve is accommodated and having a size enabling the float valve to be moved therein and an urging means such as spring for urging the float valve in a valve closing direction. The float valve is provided with a cylindrical member having an upper end closed and a lower end opened to provide an inner cylindrical space formed as an air reservoir and at least one communication port opened to a side wall section of the cylindrical member and adapted to establish communication between an inside and an outside of the air reservoir.

Abstract: A fuel leakage prevention apparatus comprising a body having a neck formed at the top and having a sealing surface at the bottom of the neck, a rib installed on the neck and having inclined upper surfaces at the top of the rib, a stopper plate extended inwardly from a lateral wall and having a center opening, and a plurality of vent holes formed at the bottom surface and the lateral surface of the body; a float located below the stopper plate of the body; a base mounted on the stopper plate and having a protruding rod extended through the center opening toward the float; spring means mounted on the base; sealing means mounted on the spring means and having a conical wing for sealing the sealing surface of the neck and a pushing rod formed at the top of the conical wing; and a ball located on the inclined upper surfaces of the rib of the body.

Abstract: A gas-pressure relief valve unit, particularly for fuel vapours, comprising a body defining a chamber which communicates with first and second environments upstream and downstream of the unit respectively, through first and second apertures. The body is provided with a first and a second assemblies, the first assembly including a valve seat interposed between the apertures and an obturator urged by a resilient thrust element and movable between a position of engagement with the seat and a position spaced from it. The obturator can move away from the valve seat, overcoming the action of the resilient element, when a predetermined threshold value of the pressure differential between the environments is reached. When the obturator is engaged with the seat and the pressure differential between the environments is less than the predetermined threshold value, the valve means define a narrow passage which allows a small, continuous flow of gas between the first and second environments.