Abstract: A device for operating a valve (1), preferably for a tire valve of a car, where a valve actuating pin (3) is biased to a valve-closing extended position and is to be depressed for opening the valve, has a disc-shaped operating member (6) arranged in a housing (4), which is mounted on the valve. The operating member is provided with a central recess (6') with gradually sloping sides in its surface facing the pin. An operating rod (7) is axially movably arranged in the housing substantially in line with the pin, the rod engaging the recess with one of its ends and the pin with the other.

Abstract: A valve for detecting a liquid surface used in a fuel tank is formed of a valve body having an orifice at an upper part thereof, a plurality of bottom through-holes formed at a bottom part thereof, and a plurality of surrounding wall through-holes formed at a surrounding part thereof; a valve member movably disposed inside the valve body to close the orifice; and an urging member for moving the valve member in cooperation with buoyancy of the valve member so as to close the orifice. In the valve of the invention, the diameter of the orifice is set to be larger than the diameter of the bottom through-holes, and also larger than a diameter of the surrounding wall through-holes. Therefore, the orifice can be prevented from being clogged by foreign substances.

Abstract: A dump valve apparatus is configured to inflate and deflate an air cushion on a bed having an articulating deck movable from a first generally horizontal position to a second angled position. The dump valve apparatus is coupled to the deck and includes an elongated housing having an interior region. The housing has first and second open ends and a central opening located between the first and second open ends. The central opening is coupled to the air cushion. The first end of the housing is coupled to an air supply. A piston is slidable within the interior region of the housing of the housing as the deck moves to its angled position to permit air to pass from the air bladder, through the central opening, and through the open second end of the housing to deflate the air bladder.

Abstract: A float valve device for a fuel tank of an automotive vehicle. The float valve device comprises a valve body installed to an upper wall of the fuel tank. The valve body is formed thereinside with a communication passage for establishing communication between inside and outside of the fuel tank. A valve mouth member is fixedly disposed inside the communication passage and includes a lower end section having a peripheral portion defining thereinside a valve opening which forms part of the communication passage. A float is disposed inside the valve body and movable relative to the valve opening in accordance with a level of the liquid in the fuel tank. A rubber member is securely disposed at an upper section of the float. The rubber member has a sealing face which is substantially flat and contactable with the peripheral portion of the valve mouth member to close the valve opening upon ascending of the float.

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 fuel tank vapor control apparatus controls the flow of liquid and vapor fuel through an aperture in a fuel tank (16). The fuel tank vapor control apparatus includes a vent housing (12) mounted in the aperture (34) and formed to include a vent inlet (13) and a vent outlet (36), the vent housing (12) defining a vent path for communicating vapor fuel from the fuel tank between the vent inlet and the vent outlet. The apparatus also includes a valve (48) movable in the vent housing between a blocking position for blocking flow of liquid and vapor fuel from the fuel tank between the vent inlet and the vent outlet along the vent path and a venting position allowing flow of vapor fuel between the fuel tank and the vent outlet along the vent path. A labyrinthine member (140) is also included, being disposed between the fuel tank and the vent path for discriminating fuel vapor from liquid fuel so as to block liquid fuel from the vent path.

Abstract: In a fuel interruption device for a fuel tank, a main valve is prevented from opening as a result of the action of an auxiliary valve during closure of the main valve; and more specifically, an auxiliary valve which is caused to move up and down by a float and a main valve which moves up and down in linkage with the up and down movement of the auxiliary valve are accommodated inside a casing which allows the inflow and outflow of liquid fuel and is provided at the end of a passage which connects the fuel tank and canister; a linking projection is provided on one of the valves, that is, either the auxiliary valve or the main valve, so that the main valve moves in linkage with the auxiliary valve in an action that is either advanced or retarded within a predetermined range, and a projection regulating groove into which the linking projection is inserted so that the projection can change its position within the range is formed in the other valve; and auxiliary valve seat and main valve seat open independently in

Abstract: Vent control valving is described for an automotive fuel vapor recovery system, in which a baffle arrangement prevents or otherwise restricts liquid fuel from entering a vent passage to a charcoal canister. A sealing arrangement prevents or otherwise restricts the escape of fuel when the vehicle is turned at a sufficient rate of turn, operated on a sufficient incline, or rolled over, and prevents overfilling of the tank, which could allow liquid fuel to enter the vent passage. In one embodiment, a differential pressure is developed across a diaphragm during refueling which unseats the diaphragm from a seat to allow unrestricted venting during refueling, restricted venting is established whenever the diaphragm is seated to limited the flow of vapors to the canister.

Abstract: An onboard vapor recovery system for a vehicle fuel system having a fuel tank (10), a filler neck (12) dynamically sealed by high pressure fuel flow from a filler nozzle, and a vapor recovery apparatus such as a carbon canister (18). The system preferably uses an inventive liquid level operated control valve (20) 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 (22) 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 (24) in the lower end of the filler pipe (12) to prevent spitback of fuel from the pressurized tank (10) once refueling has ceased.

Abstract: An improved gas ventilation apparatus for a fuel tank by which it is possible to more effectively ventilate a volatile gas from the interior of the fuel tank and preventing a leakage of the fuel through a discharge pipe even when the discharge pipe is damaged, which includes a housing arranged in an inner portion of an upper panel of a fuel tank, a gas discharge unit arranged in the interior of the housing, the upper portion of which is engaged to the upper portion of the fuel tank, and being operable in accordance with the pressure of the fuel gas generated in the fuel tank through an inlet hole formed in the lower portion of a discharge body, and a discharge pipe communicating with one side of the housing and passing through a lateral surface of the fuel tank through the interior of the fuel tank in order for the fuel gas to be discharged through the gas discharge unit.

Abstract: A vapor recovery fuel system includes a fuel tank having at least one vent opening defined therein. A fuel vapor canister is in communication with the vent opening to receive and filter fuel vapors from the tank. A refueling control valve is configured in the vent opening and has a first inlet orifice and an outlet in communication with the vapor trap. The control valve includes a variably buoyant first float body extending into an interior of the fuel tank which rises over a predetermined range of movement in response to increasing fuel level. The control valve includes a second float body engaged by the first float body over at least a portion of its range of movement. The first float body has a buoyancy during refueling so as to rise with increasing fuel level to engage and move the second float body into a sealing position to seal the inlet orifice from the outlet at a predetermined height of fuel within the tank.

Abstract: A fuel-effusion prevention valve includes a first housing member having an evaporation passage, a first engaging portion and a first cylindrical portion, and a second housing member having a partition portion, a communicating passage, a second engaging portion and a second cylindrical portion. The first cylindrical portion is formed so as to extend axially from the first engaging portion, and its diameter is smaller than that of the second engaging portion. The second cylindrical portion is formed so as to extend axially from the second engaging portion. A floating valve is disposed in a chamber so as to be able to open and close the valve hole in response to its buoyancy due to fuel flowing into the second chamber through the communicating passage. The first cylindrical portion is fused with the second cylindrical portion. A circular seal member is fitted into an installation hole formed on the fuel tank and its inner hole is fitted onto the outer circumferential surface of the first cylindrical portion.

Abstract: A composite relatively flexible resilient flap member has a movable flap and is formed of composite reinforcing fibers such as nylon, carbon or polyester impregnated with elastomeric flexible fuel resistant material. A rigid sheet member formed of composite material comprising reinforcing fibers such as glass, carbon, polyester and nylon and epoxy stiffens the flap. The flap overlies a fuel fill opening in a support plate with a major portion of the flap member fixedly overlying the plate. The flap is offset in an opening of a mounting plate secured to the support plate. The stiffened flap member is preformed with a bend to form a resilient biased hinge when flattened, the hinge being spaced from the fuel fill opening. The flap member and rigid member have low inertia to assist in rapid closure. Other embodiments are disclosed. A fuel cell tank breather vent has a tube with a male valve slug having an elongated shank.

Abstract: An over filling interdiction valve, fitted within a fluid tank, the valve comprising a housing furnished with a first fluid inlet at a bottom end thereof and a first fluid outlet at top end thereof, a float member located within the housing and being displaceable along its longitudinal axis between the first inlet and the first outlet. The float member comprises at its bottom end a second fluid inlet and near its top end a second fluid outlet. Sealing means are associated at a top end of the float member for sealing the first fluid outlet and biasing means are provided within the housing for biasing the float member towards the first fluid outlet.

Abstract: An inventive liquid level operated control valve which shuts off refueling with a two-stage closing operation providing an initial soft shutoff and a final shutoff. A first valve element is spring-biased within a first valve cage on the upper end of the float mechanism to seal against a primary vent outlet to provide the initial shutoff. A second valve element contained in a second valve cage within the first valve cage is coaxially arranged with the first valve element and serves to close a secondary vent outlet through the first valve element for the final shutoff. The decorking operation of the valve is improved with a dual peelaway action, in which both the first and second valve cages are configured to circumferentially peel their respective valve elements from their respective sealing positions.

Abstract: A tank pressure control valve is provided for controlling the discharge of fuel vapor from a fuel tank. In one embodiment, the tank pressure control valve is configured to use pressurized fuel vapor to control a flexible diaphragm operable between a closed position blocking discharge of fuel vapor from the fuel tank and an opened position allowing such discharge. In another embodiment, the tank pressure control valve is configured to use pressurized fuel vapor to move a flexible diaphragm to move a rigid valve member between a closed position and an opened position.

Abstract: A cylindrical housing including a float-type valve is latch-engaged in an installation wall in a fuel tank. The cylindrical housing has an annular groove on its entire outer circumference, while the installation wall has a plurality of resilient tongues each of which has an inwardly protruding convex. With the latch-engagement between the resilient tongues and the annular groove being provided radially outside the housing, the float-type valve is enabled to move in the cylindrical housing without interruption by the resilient tongues. A turn preventing mechanism is provided between the cylindrical housing and the installation wall at the upper parts thereof located outside the fuel tank.

Abstract: A roll over vent valve comprising:a housing having a fluid inlet and a fluid outlet, the latter comprising a substantially elongated slit-like outlet aperture of the housing bounded by a valve seating. There is furthermore provided a float member located in the housing and axially displaceable within the housing between the inlet and the outlet; an elongated flexible closure membrane strip anchored at one end thereof to an end of the float member adjacent the outlet and at a portion thereof offset with respect to the outlet; spring biassing means located within the housing and bearing on the float member so as to spring bias it in the direction of the outlet; whereby the spring biassing together with buoyancy forces acting on the float member tend to press the membrane strip into sealing engagement with the outlet aperture whilst gravity forces acting on the float member tend to displace the float member away from the outlet so as to progressively detach the strip from sealing engagement with the outlet.

Abstract: A stop valve structure that is accommodated in a fuel tank includes a casing, a float disposed inside the casing for reciprocating movement within the casing, a bottom wall defining a lower end of the casing, at least one hole provided along the periphery of the bottom wall, and a valve opening that is selectively opened and closed by the reciprocating movement of the float within the casing in accordance with a liquid fuel level within the casing. The float is provided with a tapered portion at the lower end thereof which becomes smaller in diameter toward the lower end of the casing. The float is further provided with a valve seat in an upper portion thereof. A valve mounting portion is disposed inside the casing and a valve element is mounted to said valve mounting portion. The valve seat cooperates with the valve element to selectively open and close the valve opening. These features ensure the operational stability and smoothness of the stop valve.

Abstract: A fuel outflow preventing valve device of the invention is formed of a housing, a plurality of valves, and a plurality of energizing members. The housing has a flow path, a plurality of orifices communicating with the flow path, a plurality of cavities, and a plurality of openings communicating with the cavities. Each cavity communicates with each orifice. Each valve is situated in each cavity and moves to open or close the corresponding orifice. Each energizing member is situated in each cavity to support each valve and has strength such that each energizing member can not move the valve toward the orifice to close the orifice by its own force, but each energizing member can move the valve toward the orifice to close the orifice when fluid enters into the cavity to provide buoyancy to the valve. Therefore, the fuel outflow preventing valve device has a simple structure, and each valve is prevented from being stuck to a valve seat.

Abstract: An apparatus is provided for controlling discharge of fuel vapor from an interior region of a vehicle fuel tank and preventing unsatisfactory liquid fill levels within the interior region of the vehicle fuel tank. The apparatus includes a housing adapted to be mounted in the vehicle fuel tank and formed to include a housing inlet, a vapor-inlet opening, and a passageway therebetween, a float valve disposed in the housing, and a skirt defining a channel around the float valve. Additionally a perforated baffle plate is coupled to the skirt and is formed to include a plurality of openings therethrough.

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, the body includes a portion depending from the cover that has a vapor exit port formed therein communicating with the fuel tank interior adjacent the upper wall of the fuel tank and a vent tube has one end connected to the vapor exit passage and an opposite end communicating with the vent exit port and defining a valve seat closed by a float valve during vehicle fill and wherein the vapor exit port remains open until the float valve is completely closed and wherein the vapor exit port is spaced higher than the valve seat to separate liquid fuel particles from vapor flow. In one embodiment a baffle is located on the body between the valve seat and the vapor exit port to form a liquid trap.

Abstract: A fuel tank for vehicles, particularly motor vehicles, is provided with an operational ventilating system which is composed essentially of a vent outlet arranged in the area of an upper fuel tank wall, of an exterior air feeding and air removing pipe connected to the vent outlet, and of an activated-carbon filter connected behind. To prevent liquid fuel particles from entering the activated-carbon filter by way of the vent outlet, particularly during lateral accelerations, a device is disposed inside the fuel tank in front of the vent outlet, which device partitions off the vent outlet with respect to a direct action of liquid fuel particles.

Abstract: A tank venting system includes a first vent apparatus mounted on a top wall of a fuel tank, a second vent apparatus mounted on a raised top wall of a vapor dome on the fuel tank to lie in diagonally spaced-apart relation to the first vent apparatus, a fuel vapor conduit conducting fuel vapor discharged from the first and second vent apparatus to a vapor-recovery canister, and a nozzle shut-off tube having an inlet end extending through an aperture formed in the raised top wall of the vapor dome and an outlet end coupled to a fuel tank filler neck. The inlet end of the nozzle shut-off tube is configured to sense liquid fuel levels in the fuel tank.

Abstract: A fuel cutoff valve capable of preventing a sudden rise in the internal pressure of the fuel tank during charging of fuel into the fuel tank and capable of controlling the rise in the internal pressure in stages, thereby making it possible to smoothly charge the fuel to a full tank. The fuel cutoff valve includes of a float accommodated in a case having air holes, a valve element disposed on top of the float so as to close an air efflux channel, and a spring for assisting a valve-closing movement of the float. The valve element is formed of rubber, and includes a base portion attached to an upper portion of the float and a disk-shaped seal portion capable of being brought into pressure contact with an entire peripheral edge of the air efflux channel, air holes being formed in the seal portion.

Abstract: A fuel vapor control valve for controlling the flow of fuel vapor and liquid fuel through an aperture in a fuel tank is provided. The fuel vapor control valve includes a housing mounted in the aperture and formed to include an inlet and an outlet, a chamber disposed in the housing, a pressure-relief valve disposed in the camber, and a vacuum valve disposed in the chamber and formed for movement relative to the pressure-relief valve. The vacuum valve is biased to relieve subatmospheric tank pressure below a predetermined minimum pressure and includes a base that is mounted on the pressure-relief valve and arranged to define a venting aperture. In addition, the fuel vapor control valve includes a ball that is movably positioned in the chamber to selectively interrupt the flow of fuel vapor through the venting aperture.

Abstract: A stop valve for use in, for example, a fuel tank bleeding system, has a casing with a valve opening defined in a top portion thereof, a bleeding passage provided downstream of the valve opening, a float provided in a casing for vertical movements, and an elastically deformable valve element disposed on top of the float for closing the valve opening when raised together with the float. The valve element includes a hole extending therethrough. An abutment member is provided in the valve opening for, when the valve element is lifted, abutting a portion of the valve element that surrounds the hole. Optionally, the lower end of the abutment member has a recess. The abutment member may be provided with a member for reducing deformation of the valve element caused by abutment to the abutment member. A fuel splash guard may be provided in the bleeding passage.

Abstract: The float valve of the invention comprises: a case 11, float 15, valve 16 capable of closing a efflux channel 18 of air A, and ball 17 for supporting a motion of closing the float 15. A through-hole 13a for communicating air provided on the side wall 13 of the case is open at a position, the level of which is the same as that of a fuel level LF in the fuel tank in the case of appropriately filling up the fuel tank with fuel. A float body 15a of the float 15 is disposed on a plate portion 12a on the bottom wall 12 of the case at a position higher than a through-hole 13a on the side wall 13 of the case. Thereby, air can be positively discharged from the fuel tank until the fuel level reaches a position at which the fuel tank is filled up with fuel in the case of refueling, so that fuel can be smoothly fed into the fuel tank.

Abstract: A fluid-responsive vent control valve for an automobile fuel tank in which a liquid level responsive float controls a flexible, ribbon type valve member to peel it on and off a valve seat to open and close the valve. In one embodiment the float and outlet structure are offset. In an alternate embodiment the float and vent outlet are coaxial, and the ribbon valve is attached between the float and the valve body with a vent closure portion aligned with the outlet and a hinge portion offset from the outlet and connected to the float to provide opening and closing force to the ribbon valve. The outlet is preferably circular, and further includes a roundoff notch which cannot be closed by the pressure differential across the ribbon valve, but requires a final closing movement by the float and closure assist structure to fully close the valve.

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 rollover vent valve for use in a pneumatic seat mounted in a vehicle. The rollover vent valve allows air to vent from the air bag(s) in the pneumatic seat in the event the vehicle in which the seat is mounted is severely tilted or overturned. The rollover vent valve includes a housing enclosing a pressure chamber and a valve member. The interior of the pressure chamber is in fluid connection with the air bag(s). The rollover vent valve also includes a vent port that connects the interior of the chamber to the ambient environment. The valve member is located within the pressure chamber above the vent port and forms a seal with the vent port when the pneumatic seat in which the valve is mounted is in an upright position. The valve member includes a weight cage in which a spherical weight is movably mounted. One end of the weight cage includes a valve seal that forms a seal on the valve seat of the vent port.

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 fuel shut-off device in which easier assembly and improved air-tight sealing can be achieved. A partition wall plate is ultrasonically welded to a fixing steplike portion of a case body to form an air-tight bidirectional valve chamber comprising the partition wall plate and the case body. The bidirectional valve chamber accommodates a bidirectional valve composed of a positive pressure valve mechanism and a negative pressure valve mechanism. A negative pressure valve member of the negative pressure valve mechanism and a negative pressure spring are formed into an integral structure with a positive pressure valve member of the positive pressure valve mechanism. The positive pressure valve member is formed into an integral structure with the partition wall plate by the engagement of an engaging ring-shaped member of a valve receiving member and an engaging arc-shaped member of the partition wall plate.

Abstract: An apparatus to control the flow of hydrocarbon fuel vapor from a vehicle fuel tank. The apparatus is mounted adjacent the top of the fuel tank and contains a valve system which controls fuel vapor flow from the tank to a receiving canister and prevents the vapor from escaping to the atmosphere. The valve system utilizes a diaphragm, operably connected to a main valve, to prevent the vapor pressure in the fuel tank from closing the valve. The main valve is actuated by a float responsive to the level of fuel in the tank and remains open when the fuel level is below a designated level and closes due to a sufficiently high fuel level or in a vehicle roll-over condition to prevent liquid fuel from escaping from the fuel tank through the apparatus.

Abstract: A float valve for a fuel tank, which comprises an upper float chamber, a middle chamber, and a lower float chamber housed in a case that is fixed to the upper wall of a fuel tank. The upper float chamber includes a first communication hole that directly communicates with an air bleed duct. The upper float that can block that first communication hole when the tank is full. The middle chamber includes a third communication hole communicating with the lower float chamber which has a first air hole located at a position corresponding to the desired fuel level for a full tank. The lower float chamber includes a lower float than can block the third communication hole, and a second air hole which is located bellow the lower float. Because the air passages and float activation allow air to be vented as the fuel level rises in the tank fueling proceeds smoothly and drastic increases in internal pressure, that will stop fueling prematurely can be avoided.

Abstract: A stop valve capable of reducing generation of noise and a valve body can surely close a valve seat even if a float is inclined. The stop valve has a case, a float provided in the case so as to move vertically, wherein a valve seat is closed by a valve body when the float moves upward while the valve seat is open when the float moves downward, a pedestal provided under the case for placing a spherical weight thereon, characterized in that the pedestal has radial slits thereon and the float has radial slits at the bottom wall thereof.

Abstract: A fuel control valve is located in a fuel tank and comprising an outlet, a liquid inlet and a vapor inlet. The valve permits to flow fuel vapor only from the inlets to the outlet and prevents drops of fuel liquid from flowing to the outlet. A float is located in the valve and prevents the drops of the fuel from flowing between the liquid inlet and the outlet. A wrapper is opposed to the vapor inlet and prevents the drops of the fuel from flowing between the vapor inlet and the outlet.

Abstract: An apparatus is provided for controlling flow of fuel vapor and liquid fuel through an aperture in a fuel tank. The apparatus includes a housing mounted in the aperture and a vent valve movable in the housing to block flow of fuel vapor between the fuel tank and an outlet. The housing is further formed to include a float valve movable between a closed position blocking flow of fuel vapor and liquid fuel through the outlet and an open position allowing flow of fuel vapor through the outlet. The float valve includes a wide-diameter base, an upwardly extending closure appended to the base member, and a downwardly extending narrow-diameter weighted unit depending from the base. The base and the weighted unit are sized, shaped, weighted, and located to cause the float valve to "snap" (e.g. move quickly and suddenly) to its closed position after rising fuel in the fuel tank rises past the weighted unit and engages the underside of the base.

Abstract: A venting control system is provided for controlling discharge of fuel vapors from a vehicle fuel tank. The system includes a vent apparatus mountable in an aperture formed in the top wall of the fuel tank. The vent apparatus is formed to include a vapor inlet opening communicating with an interior region of the fuel tank, a vapor outlet opening, and a passageway interconnecting the vapor inlet and outlet openings. The system further includes a tubular skirt having an uppermost end coupled to the vent apparatus and a lowermost end and a fill-limit valve assembly coupled to the lowermost end of the tubular skirt. The tubular skirt and the fill-limit valve assembly are positioned to lie in the interior region of the fuel tank when the vent apparatus is mounted in the top wall aperture of the fuel tank.

Abstract: A float valve for use in a fuel tank, having a float for regulating air flow out of an air outflow channel provided in an upper portion of the fuel tank. An air flow deflecting portion provided on the float prevents the float from being lifted as air and fuel vapors displaced when the fuel tank is filled-up escape the tank. When the fuel level in the tank rises to a filled-up position, the outflow of air is stopped by the float.

Abstract: A diaphragm-activated control valve and system for both refuel and running loss venting of a fuel tank to a vapor trap. The control valve is connected to fill control and rollover valves in the fuel tank, and defines a separate venting flow path for each valve to the vapor trap. The control valve is responsive to pressure conditions at the filler pipe inlet to alternately open and close the flow paths. During refueling the control valve vents the tank through the fuel-level responsive fill control valve. When the filler pipe inlet is closed, the control valve switches to vent the tank through the rollover valve. In a preferred form, the control valve includes a liquid fuel drain to prevent its being disabled by fuel entering from the filler pipe inlet via the signal pressure line during refueling. The drain includes a reverse flow check valve to prevent vapor venting out the drain path to the atmosphere during refueling.

Abstract: An anti-spilling valve for a vehicle fuel tank includes a cylindrical valve chamber having an upper wall at its upper end and closed at its lower end by a filter, an upwardly directed exhaust passage for fuel vapor formed at the center of the upper wall of the cylindrical valve chamber, a connecting pipe provided on the upper wall of the cylindrical valve chamber to extend radially outward and to have its inner end communicate with the upper end of the exhaust passage at a right angle, the inside diameters of the exhaust passage and the connecting pipe being equal, a float housed in the cylindrical valve chamber to be vertically movable and having on its upper surface a valve head adapted for closing the lower end of the exhaust passage, and a valve seat ring attached to the lower end of the exhaust passage closed by the valve head of the float, the valve seat ring having a smaller inside diameter than the exhaust passage.

Abstract: A fuel vapor control valve is provided for controlling the flow of fuel vapor and liquid fuel through an aperture in a fuel tank. The fuel vapor control valve includes a housing mounted in the aperture. The housing is formed to include an inlet in fluid communication with the fuel tank and an outlet. A valve is movable in the housing between a blocking position blocking flow of fuel vapor between the inlet and the outlet and a venting position allowing flow of fuel vapor between the inlet and the outlet. The fuel vapor control valve also includes a spring for biasing the valve toward its blocking position and a mechanism for using fuel vapor from the fuel tank to move the valve toward its venting position. A ball is movably positioned in the venting control chamber to selectively interrupt the fluid communication between the inlet and the outlet.

Abstract: The invention disclosed relates to an apparatus for permitting uninterrupted relief of cargo tank compartment internal pressures while also preventing the leakage of lading from the cargo tank to the surrounding atmosphere during sudden increases in the cargo tank internal pressure. According to one embodiment of the present invention, the cargo tank compartment pressure relief valve comprises a flow chamber coupled to an opening in the cargo tank compartment wall, wherein the flow chamber has a first opening in flow communication with the tank compartment and a second opening in flow communication with the atmosphere, whereby the first opening is under the control of a downwardly biased first vent head and the second opening is under the control of a downwardly biased second vent head.

Abstract: A device for preventing a "gas-lock" comprising a hollow casing defining a reservoir of given capacity and having a lower portion and a set of three openings, that is a first and a third openings substantially positioned at the lower portion of the casing and a second opening positioned near a bottom of the reservoir; a second connection for connecting a corresponding end of the second channel with the second opening; a third channel having opposite ends, one end being positioned near a portion of the first container that is opposite to the aperture of the first container; a third connection for connecting the opposite end of the third channel with the first opening; a check valve; a fourth connection for connecting the check valve with respect to the third opening and for selectively, enabling the liquid contained in the first container to pass through the third opening; the capacity of the reservoir being sufficient to collect when the first container is turned upside-down to have its third channel above th

Abstract: A refueling vapor recovery system for a vehicle utilizes recirculation of a portion of the displaced vapor and combines a vapor vent valve and a recirculation control into a single differential pressure valve assembly. A vapor vent conduit provides fuel tank vapor pressure to one side of a diaphragm and, through a restricted orifice, to the other side of the diaphragm, the other side being further connected by a recirculation conduit to the tank filler neck. When a gas cap closes the filler neck from the atmosphere, the orifice allows pressure to equalize across the diaphragm; and a spring biases the diaphragm to close a vapor vent valve.

Abstract: An apparatus is provided for controlling venting of fuel vapors from a vehicle fuel tank. The apparatus includes a housing having an inlet receiving fuel vapor from the fuel tank and an outlet discharging vapor to a vapor treatment device and a valve having a central portion and an outer annular portion. The valve is movable in the housing and cooperates therewith to define a first vent chamber communicating with the fuel tank and a second vent chamber communicating with the vapor treatment device. A first vent opening is formed in the central portion of the valve. The apparatus also includes a member partitioning the first vent chamber into a central region exposed to pressure from the second vent chamber and an outer annular region exposed to pressure from the inlet. A spring normally biases the valve into engagement with the partitioning member to block flow of fuel vapor from the outer annular region of first vent chamber through the first vent opening to the second vent chamber.

Abstract: A fuel vapor discharge limiting device for limiting communication between a fuel tank and a fuel vapor discharge pipe for discharging a fuel vapor in the fuel tank. The fuel vapor discharge limiting device includes a first float valve for cutting off the communication between the fuel tank and the fuel vapor discharge pipe when a liquid level in the fuel tank rises near a predetermined full level; a relief valve for allowing the communication between the fuel tank and the fuel vapor discharge pipe when an internal pressure in the fuel tank becomes not less than a predetermined value; and a second float valve for blocking the communication allowed by the relief valve when the liquid level in the fuel tank abnormally rises over the predetermined full level. Accordingly, oversupply of liquid fuel to the fuel tank can be prevented, and the internal pressure in the fuel tank can be maintained always within a predetermined permissible range.

Abstract: A shut-off valve for a liquid fuel includes a valve housing in which a float, adapted to bs raised by buoyant force as the liquid fuel flows into the valve housing, and a valve disc, for sealably closing a fuel vapor outflow hole, are arranged in such a manner as to allow the valve disc to be vertically displaceable relative to the float. A plate-like valve member, which carries a rod-shaped protuberance for sealably closing a through hole formed through the valve disc, is disposed between the valve disc and the float. When the float is lowered as the liquid fuel returns from the valve housing to the fuel tank, a first engagement pawl engages the plate-like valve member at a single point and, at the same time, a second engagement pawl engages a flange portion of the valve disc at a single point, whereby the plate-like valve member and the valve disc are opened so as to enable the fuel vapor generated in the fuel tank to flow into a receiving canister.

Abstract: A fuel vapor vent assembly with liquid trap is incorporated in a vent valve mounted on a motor vehicle fuel tank. The vent valve operates to vent the fuel tank through a vertically oriented orifice in the vent assembly when the valve is in a normal upright position and closes the orifice when the fuel tank together with the valve is tipped to a significant degree from this position. An elevated liquid trap is provided in the vent assembly at the outlet of the orifice that traps liquid from the venting fuel vapor while permitting venting to continue therethrough and then drains the trapped liquid back past the valve into the tank when the pressure in the latter is relieved. An insert mounted in the valve body is adapted to define both the orifice and liquid trap.