Abstract: The present invention relates to a pipe connector assembly and a tire maintenance apparatus having the same. The pipe connector assembly comprises a leak-proof valve, and the leak-proof valve is opened only after a sealed fluid medium path is formed between the pipe connector assembly and the tire valve when the pipe connector assembly is screwed to the tire valve. The present invention advantageously prevents fluid medium leakage at the connection between the pipe connector assembly and the tire valve.

Abstract: A valve assembly for a tire pressure control system used to control tire pressure of a vehicle has a unitary body and one or more valves. The unitary body has attachment points for mounting the unitary body to a vehicle wheel end, one or more valve cavities formed in the unitary body, and a plurality of air passages formed in the unitary body. The plurality of air passages have an air supply passage that is connectable to an air supply and a tire supply chamber for connecting to a tire of the vehicle. The air supply passage and the tire supply chamber are connected to each of the one or more valve cavities. Each valve has a valve element mounted to the valve cavity, an air supply chamber in communication with the air supply passage, and a tire supply chamber in communication with the tire supply passage.

Abstract: A pneumatically controllable valve assembly, in particular for use in a tire inflation system, includes a first fluid port, a second fluid port, and a movable member configured to be moved between an open position and a closed position. When the movable member is in the open position the first fluid port is in fluid communication with the second fluid port. When the movable member is in the closed position the first fluid port is fluidly isolated from the second fluid port. A first pneumatic actuator is in fluid communication with the first fluid port. The first pneumatic actuator is configured to bias the movable member toward the open position. A second pneumatic actuator is configured to bias the movable member toward the closed position. The valve assembly also includes a flow restrictor. The first fluid port is in fluid communication with the second pneumatic actuator by way of the flow restrictor, at least when the movable member is in the open position.

Abstract: The invention relates to equipment, devices and methods for testing a calibrated leak or passage of pressurized gas from a tire. In one example, a test plug including a calibrated cross section orifice and a predetermined gas flow rate is connected to a tire. The test plug applies a pressure opening the tire valve member to release gas from the tire through the test plug. In one example, a TPMS sensor and a TPMS measurement tool are used to measure the decrease of air pressure in the tire through the test plug and determine if the TPMS sensor is operating properly. In one example, a plurality of test plugs with different gas flow rates are provided. A method for testing the calibrated leak using the test plug is further disclosed.

Abstract: An on-board centralized system for regulating pressure of tyres of a vehicle includes a pressurized air source, a circuit communicating the source with a plenum of each wheel, and an arrangement for connecting the plenum of each wheel to the inner chamber of the respective tyre that includes first and second connection lines for deflation and inflation, respectively, of the tyre, and first and second one-way valves interposed, respectively, in the first and second connection lines to allow only a flow of air respectively from and to the inner chamber. The first valve includes a spring having a pre-set load so as to isolate the inner chamber from a part of the circuit upstream of the first valve when said upstream part is at atmospheric pressure, and to guarantee a pre-set minimum value of pressure in the inner chamber when the upstream part is at a pressure lower than atmospheric pressure.

Abstract: An air supply system for a work vehicle includes a compressor configured to compress a first supply of ambient air and to output a compressed air supply via a compressed air line, an air induction assembly configured to receive the compressed air supply from the compressed air line and to flow the compressed air supply through a body of the air induction assembly to create a low pressure region sufficient to draw in a second supply of ambient air, wherein the body is configured to combine the second supply of ambient air with the compressed air supply to generate a combination air supply, and a tire inflation system fluidly coupled to the air induction assembly and configured to selectively increase and decrease an air pressure within a tire of the work vehicle.

Abstract: An assembly for a tire inflation system includes a tire stem. A housing is engaged with a first end of the tire stem. The housing comprises a fluid conduit extending therethrough and a first adapter secured to a second adapter. The second adapter receives the first end of the tire stem and a first end of the first adapter. The first end of the tire stem and the first end of the first adapter abut each other. A valve is disposed in the fluid conduit and positioned within the first adapter. A depressor member is attacked to the first end of the first adapter and provided in the fluid conduit. The depressor member extends away from the valve and toward the tire stem. A seal member is disposed in a groove in the second adapter and provided around an outer surface of the tire stem.

Abstract: A tire management system includes a control valve and a check valve. A method for managing a tire includes: determining a pressure parameter value, determining an operational parameter for a valve based on the pressure parameter value, and controlling the valve based on the operational parameter.

Abstract: Described herein is an inflation/deflation device of the type comprising a portion provided with an intake orifice for taking in a gaseous fluid under pressure, and a portion provided firstly with an inflation/deflation orifice designed to communicate with the confinement capacity, and secondly with a discharge orifice opening out between the two portions; and a valve member control system for inflation/deflation operations per se. In accordance with the invention, one of the portions is provided with arrangements for receiving a washer, which arrangements are suitable for allowing said washer to deform elastically, under the effect of a pressure of a gaseous fluid discharging through the discharge orifice, so as to release face-on bearing by an annular protuberance provided on the other portion, and so as to generate a fluid discharge passage between said annular protuberance and said washer.

Abstract: Various embodiments of the present disclosure provide a pneumatic inflator for automatically inflating inflatable articles, such as dunnage bags, to a desired pressure. Generally, once activated, the pneumatic inflator of the present disclosure inflates an inflatable article via a compressed air source until the air pressure inside the inflatable article reaches an operator-selected desired pressure. Thereafter, the pneumatic inflator automatically stops inflating the inflatable article. In various embodiments, the pneumatic inflator also includes a manual shut-off that, when activated while the pneumatic inflator is inflating the inflatable article, causes the pneumatic inflator to stop inflating the inflatable article. The pneumatic inflator of the present disclosure thus enables automatic inflation of inflatable articles to particular, operated-selected desired pressures with limited operator input.

Abstract: A tire pressure control arrangement for a vehicle having at least two tires connected to an air supply. Each tire is connected to the air supply via a supply line having a first valve connected to a second valve. The arrangement further includes a pressure sensor between the two valves. The first valve is closed while the supply line is connected to a pressure supply and the pressure in the supply line is monitored for a pre-determined period of time by a control system on the vehicle to detect whether there are any leaks in the arrangement.

Abstract: In one embodiment, a dynamic tire air pressure system for a vehicle is disclosed. The system includes a tire pressure sensor that measures an air pressure of a tire. The system also includes a first reservoir tank maintaining a lower air pressure than the measured air pressure of the tire. The system further includes a second reservoir tank maintaining a higher air pressure than the measured air pressure of the tire. The system additionally includes one or more valves that control deflation and inflation of the tire by selectively coupling the tire to the first or second reservoir tanks.

Abstract: A method of venting a tire inflation system includes providing a housing and providing a first valve assembly within the housing. The first valve assembly venting a first fluid conduit disposed within the housing. A second valve assembly is provided and attached to the first fluid conduit. The second valve assembly venting a first fluid control circuit.

Abstract: A valve assembly having a housing, and a valve portion disposed in the housing, where the valve is able to change between an open position and a closed position. The valve assembly also includes a variable pneumatic device disposed in the housing, which is able to change between a first configuration and a second configuration, and an inner cavity in fluid communication with the housing. An exhaust aperture is formed as part of the housing, and as pressure builds in the variable pneumatic device, the variable pneumatic device changes from the first configuration to the second configuration such that air is prevented from flowing around the variable pneumatic device, and air flowing through the valve body passes through the exhaust aperture.

Abstract: An inflation device for a wheel with a pneumatic tire. A valve having a seat carried by a body and a head separates a chamber from an output connector. The head is movable within the chamber between a closed position wherein it is in abutment on the seat and an open position wherein it is separated from the seat so as to put the radial openings into communication with the output connector. The head is elastically held in the closed position against the seat so as to allow lifting of the head when the pressure in the output connector is greater than a predetermined threshold.

Abstract: A pressure relief valve for use with flexible containers is disclosed. The valve comprises a valve chamber, a valve chamber seat with an inlet gas port or ports to the interior of the container and a resilient diaphragm floating within the chamber. The valve seat is shaped with a generally flat diaphragm-engaging surface in a central area of the diaphragm where the inlet gas port(s) are located, and at least one surface that does not generally engage the outer portion of the diaphragm, such that a diaphragm floating in the valve chamber engages a central portion of the valve seat surface stopping the passage of gases in or out of the container before a certain pressure is reached, but permitting the passage of gases from within the flexible container as pressure builds, while preventing the flow of atmospheric gases into the container.

Abstract: A pneumatic cargo stabilization system includes a first line configured to be coupled to a dunnage bag and configured to selectively convey a flow of a gas from a source to the dunnage bag, a second line in fluid communication with the gas in the dunnage bag, and a valve coupled in series with the first line, between the source and the dunnage bag. The valve includes a body that defines pressure supply port, a container port, and an exhaust port, a diaphragm assembly, and a spring member positioned to apply a biasing force to a first side of the diaphragm assembly, the second line conveying a feedback to a second side of the diaphragm assembly that opposes the biasing force.

Abstract: A control valve for an air cushion bed includes a first main body, a membrane plate, a second main body, a sensor, and a depressurization unit. The membrane plate is clamped between the first main body and the second main body. The second main body at one side of the membrane plate is connected with the sensor. The sensor is used to detect the inputted air pressure. When the air is over, the air can be depressurized by the depressurization unit. The control valve of the present invention is applied to input and control the air of the air cushion bed, having depressurization and air detection functions.

Abstract: A micro fluidic device includes a valve/pump-unit with reduced dead volume having a substrate. The lower surface of the substrate includes two micro channels spaced apart by a valve area of the substrate that separates the two micro channels. A flexible membrane is arranged on the lower surface of the substrate facing an actuating element located in a through going cut-out of a cover element. Movement of the actuating element towards and away from the valve area of the substrate causes a pump and/or valve action of the flexible membrane area, respectively, to cause or stop a directed fluid flow between the two micro channels through a channel formed between the valve area of the substrate and the flexible membrane.

Abstract: A self-inflating tire assembly includes an air tube connected to a tire and defining an air passageway, the air tube being composed of a flexible material operative to allow an air tube segment opposite a tire footprint to flatten, closing the passageway, and resiliently unflatten into an original configuration. The air tube is sequentially flattened by the tire footprint in a direction opposite to a tire direction of rotation to pump air along the passageway to an inlet device for exhaust from the passageway or to an outlet device for direction into the tire cavity. The inlet device is positioned within the annular passageway 180 degrees opposite the outlet device such that sequential flattening of the air tube by the tire footprint effects pumping of air along the air passageway with the tire rotating in either a forward or reverse direction of rotation. The invention further includes an inlet device for regulating the inlet flow of the air tube pump.

Abstract: A pressure-controlled three-way valve device for inflating, keeping inflated and deflating tires, the device having a plunger axially traversed by an inlet passage normally closed by a spring-urged inlet valve. The plunger's outer sidewall has a recess in which an O-ring extends to abut against the steps of the recess to limit the plunger stroke and keep an outlet circuit closed to a venting port formed in the sidewall of the body of the device. The plunger moving between a position to open air supply to the tire, a position to keep an outlet circuit to a tire closed and a position to open a venting port to deflate the tire. The plunger being mounted into the valve body by a diaphragm sealing an outer wall of the plunger against the valve body and permitting the moving of the plunger with minimal friction between the plunger and the valve body.

Abstract: The specification discloses a tire inflation pressure regulator facilitating precise tire inflation. The regulator includes a body, a two-position valve within the body, and a rotational lock. The body includes an air inlet, an air outlet, and an air vent. In one position, the valve directs air from the air inlet to the air outlet when the tire pressure is below a preset level; and, in a second position, the valve directs air from the air inlet to the air vent when the tire pressure exceeds the preset level to prevent overfilling. The valve moves rapidly between the two positions, and is unstable between the two positions. The valve includes a regulator enabling the preset level to be adjusted. The rotational lock enables the regulator to be screwed onto a tire stem, but prevents removal of the regulator from the tire stem without a key.

Abstract: A pressure regulator apparatus usable with an aerosol supply device containing a fluid includes an inflatable diaphragm unit including an upper surface member, a lower surface member, and a diaphragm chamber formed between the upper surface member and the lower surface member, an output port member having an output cavity and an output port, at least a portion of the output port member is disposed within and in fluid communication with the diaphragm chamber, a valve actuator including an actuator cavity and one or more actuator openings in fluid communication with the output port, at least a portion of the valve actuator is moveably disposed within the output cavity, an input port member having an input port configured to allow the fluid to enter the actuator cavity, at least a portion of the input port member is disposed proximate to the actuator cavity, and an axial flow path extending between the input port and the output port, and configured to allow the fluid to selectively pass in a substantially axial

Abstract: The invention relates to an air core filling system for reclining or seating furniture, for example, for a mattress, an armchair, a car seat, a piece of camping furniture or similar, comprising an air core and an integrated air core filling system, reacting to a load, which independently, supplies a dosed amount of air into the air core, in order to maintain the same at a given adjustable pressure in the non-loaded state. Said air core filling system comprises an air pump system (3) with at least two separate chambers (2, 6) and control system (17), whereby the first chamber (2) is directly connected to the air core by a line (1) and a second chamber (6) is connected to the air core by a line (7) through a pressure regulation valve (13) and to the ambient air by a line (9).

Abstract: A backflow and flow rate control system, comprising: a flow restrictor; a flow regulator chamber located down-stream of the flow restrictor; a control chamber configured to receive a portion of the fluid from a location upstream of the flow restrictor; a moveable element with no sliding parts positioned between the control chamber and the flow regulator chamber, wherein the moveable element is configured to move in response to a difference in pressure between the flow regulator chamber and the control chamber; a flow rate regulator configured to control the flow rate of the fluid in response to the movement of the moveable element; and a non-return regulator coupled with the moveable element and configured to control back-flow of the fluid.

Abstract: A valve device includes a tubular member fitted into an inflatable article, a flexible diaphragm having a peripheral region which engages a valve seat of the tubular member through a mounting support and an intermediate surrounding region which has a portion that can be flexed to deflect a corresponding portion of the peripheral region from the valve seat, and a positioning member which is actuated to be displaced between normally-closed and deflating positions so as to bring an engaging end thereof to be proximate to or distal from the valve seat. In the deflating position, the flexed portion is vested with an increment of biasing force that is counteracted by a resisting force at an actuated end so as to keep the peripheral portion in a deflected position for maintaining the valve device in an open state.

Abstract: A method of verifying the integrity of a valve in service in a tire pressure management system is disclosed. The method of verifying valve integrity of a valve interposed between a tire and conduit assemblies for conducting fluid to and/or from the tire in a tire maintenance system includes closing the valve for prohibiting fluid flow into the conduit assemblies in fluid communication with the valve and monitoring the pressure of fluid in the conduit assemblies in fluid communication with the valve for ascertaining a pressure increase therein.

Abstract: A method of verifying the integrity of a valve in service in a tire pressure management system is disclosed. The method of verifying valve integrity of a valve interposed between a tire and conduit assemblies for conducting fluid to and/or from the tire in a tire maintenance system includes closing the valve for prohibiting fluid flow into the conduit assemblies in fluid communication with the valve and monitoring the pressure of fluid in the conduit assemblies in fluid communication with the valve for ascertaining a pressure increase therein.

Abstract: The invention concerns a controlled pneumatic valve (1), for remote inflating and deflating of a capacity (2), comprising a membrane (17) maintained between a valve body (18), including orifices (24) and a cover (19); and defining with said cover a control chamber (20) and with the body an escape chamber (21), the latter being capable of being connected with the capacity (2) for deflation when the check valve (28) is thrust by levers (32) inverting the direction of movement of the membrane (17) sucked towards the cover (19). By the action of a pressure in the control chamber (20), the membrane (17), bearing a cup (33) with an annular conduit, moves towards the body (18), isolates the escape chamber (21), and opens the check valve (28) by direct thrust to perform inflation. The inventive device is particularly designed to control and adjust tire pressure.

Abstract: A pressure regulating device for connecting a pressure source to an inflatable object comprises: a hollow casing; a valve system positioned inside the hollow casing; a fluid inlet connected to the valve system; a fluid outlet; a fluid conduit positioned inside the hollow casing between the fluid inlet and the fluid outlet; a pressure-sensing structure attached to the conduit and being movable inside the hollow casing and attached to the pressure sensing structure; a pressure-generating structure disposed inside the hollow casing and attached to the pressure-sensing structure. The pressure-generating structure can exert a bias force upon the pressure-sensing structure in proportion to a desired pressure in the inflatable object. The pressure regulator can inflate the object when the initial pressure inside the inflatable object is lower than the desired pressure and automatically terminates inflation when the pressure inside the object reaches the desired pressure.

Abstract: A method of verifying the integrity of a valve in service in a tire pressure management system is disclosed. The method of verifying valve integrity of a valve interposed between a tire and conduit assemblies for conducting fluid to and/or from the tire in a tire maintenance system includes closing the valve for prohibiting fluid flow into the conduit assemblies in fluid communication with the valve and monitoring the pressure of fluid in the conduit assemblies in fluid communication with the valve for ascertaining a pressure increase therein.

Abstract: Deformable hollow bodies are placed in cylinders of printing presses to actuate retaining and clamping devices. The hollow bodies require a sealed supply channel for supply of a pressure medium. A sealing surface and a dividing surface between the cylinder and the hollow body are arranged parallel to each other and generally perpendicularly to the direction of pressure generated by the pressure medium flowing into the hollow body.

Abstract: Described are dispensing apparatuses and methods of their use, the dispensing apparatuses having one or more process chamber inside of a control chamber, and the volume of the process chamber increases or decreases by adding or removing control fluid from the control chamber, with proper valving, to cause fluid to flow into and out of the process chamber, for use in dispensing fluid, especially in precise amounts.

Abstract: The invention concerns a controlled pneumatic valve (1), for remote inflating and deflating of a capacity (2), comprising a membrane (17) maintained between a valve body (18), including orifices (24) and a cover (19); and defining with said cover a control chamber (20) and with the body an escape chamber (21), the latter being capable of being connected with the capacity (2) for deflation when the check valve (28) is thrust by levers (32) inverting the direction of movement of the membrane (17) sucked towards the cover (19). By the action of a pressure in the control chamber (20), the membrane (17), bearing a cup (33) with an annular conduit, moves towards the body (18), isolates the escape chamber (21), and opens the check valve (28) by direct thrust to perform inflation. The inventive device is particularly designed to control and adjust tyre pressure.

Abstract: An improved fluid flow valve (10) for a fluid flow control system. The flow valve (10) includes a flow-regulating assembly (40) having a housing (44) having a piston bore (15) within which is slideably disposed a piston-like member (42). The piston-like member (42) has a primary flow passage (52) and at least one secondary flow passage (54) formed therein. A first portion (42a) of the pistonlike member (42) is configured for mating with a seat (46) of the housing (44), and a resilient member (48) biases the piston-like member (42) away from the seat (46). When at least a predetermined fluid pressure differential exists, the first portion (42a) mates with the seat (46) and causes the at least one secondary flow passage (54) to be at least substantially closed such that fluid can substantially flow only through the primary flow passage (52).

Abstract: An improved fluid flow valve (10) for a fluid flow control system. The flow valve (10) includes a flow-regulating assembly (40) having a housing (44) having a piston bore (15) within which is slideably disposed a piston-like member (42). The piston-like member (42) has a primary flow passage (52) and at least one secondary flow passage (54) formed therein. A first portion (42a) of the pistonlike member (42) is configured for mating with a seat (46) of the housing (44), and a resilient member (48) biases the piston-like member (42) away from the seat (46). When at least a predetermined fluid pressure differential exists, the first portion (42a) mates with the seat (46) and causes the at least one secondary flow passage (54) to be at least substantially closed such that fluid can substantially flow only through the primary flow passage (52).

Abstract: A simple and frictionless pressure limiting valve assembly for use in pneumatic tire valves wherein a snap diaphragm is movable into and out of a sealing relationship with a valve member by means of the snap action of a snap action diaphragm. The snap action diaphragm may be biased by a means if desired to permit inflation of the pneumatic tire until a desired pressure is reached whereby the snap action diaphragm reverses itself and closes the air flow passageway. This inexpensive assembly only has a few parts. Some preferred embodiments are easy to incorporate (add to) in a conventional tire valve assembly and some others have their specific design. The effective point of activation of the snap action of the snap action diaphragm may be calibrated to precise values.

Abstract: The device for inflating pneumatic tires comprises an inlet of pressurized air and an outlet for sending the air into a pneumatic tire. A first circuit of the device is divided into an initial tract and a final tract, which connects the inlet with the outlet, passing through a first on-off valve provided with a membrane. A second circuit of the device connects the inlet with a first chamber of the first on-off valve. The first chamber is also connected to a pressure regulator connected at outlet to a second on-off valve, which intercepts the air flow. A third circuit connects the outlet to a first chamber of the second on-off valve.

Abstract: Fluid flow through a conduit is selectively blocked upon the occurrence of an alarm condition by an inflatable member normally folded when not in use to occupy as small a volume as is practicable. The small size volume together with securement of the inflatable member in a preferred location minimizes the effect of the inflatable member to normal fluid flow. A thin, tear-away sleeve maintains the inflatable member in the folded state and quickly tears apart during inflation enabling the inflatable member to fill and plug the interior of the conduit. The shape of the inflatable member, together with the fluid source utilized for inflation assures rapid, liquid-tight sealing. Alarm signal monitoring and inflation initiation is guaranteed under substantially all conditions through the employment of an electronic controller with a stand-by battery.

Abstract: A self-regulating tire pressure system and method employs a bistable valve (10) that allows air from a high pressure reservoir (6) to replenish the pressure within a tire (4) when it has fallen below an actuating pressure, and discontinues its operation only after the tire pressure has increased to a closing pressure that is greater than the actuating pressure. The system is capable of sensing the valve's (10) frequency of operation as an indication of a slow tire leak when the frequency exceeds a predetermined threshold, of sensing the number of valve (10) operations and the duration of each operation as an indication of a flat tire condition when the number of operations for a predetermined duration exceeds a second threshold, and of sensing the duration of the valve's (10) operation as an indication of a low reservoir (6) pressure condition when that duration exceeds a third threshold.

Abstract: A normally closed wheel valve for maintaining an existing air pressure in a tire of a vehicle having a system for inflating and deflating the tire is mounted on the outer end of the wheel hub for rotation therewith and is connected in communication with a source of air under pressure on the vehicle through a coupling on the outer end of the valve which is rotatable relative thereto. The valve comprises axially opposed pneumatically actuated diaphragm elements for controlling the flow of air to and from a pair of tires rotatably mounted on a common axle of the vehicle.

Abstract: A self-regulating tire pressure system and method employs a bistable valve (10) that allows air from a high pressure reservoir (6) to replenish the pressure within a tire (4) when it has fallen below an actuating pressure, and discontinues its operation only after the tire pressure has increased to a closing pressure that is greater than the actuating pressure. The system is capable of sensing the valve's (10) frequency of operation as an indication of a slow tire leak when the frequency exceeds a predetermined threshold, of sensing the number of valve (10) operations and the duration of each operation as an indication of a flat tire condition when the number of operations for a predetermined duration exceeds a second threshold, and of sensing the duration of the valve's (10) operation as an indication of a low reservoir (6) pressure condition when that duration exceeds a third threshold.

Abstract: A tire pressure control system (10) for wheels (28) of a vehicle. The system includes an air control circuit (40) having a positive pressure air source (42), a vacuum pressure air source (44), a central control unit (46), a vehicle speed sensor (47), and a command/display console (48). The control circuit (40) includes valves (62,64,66,68,70) and a conduit assembly (74) for controlling communication of the positive and vacuum pressure air to wheel valve assemblies (14) mounted on each wheel. A vent valve (86) provides quick venting of positive air pressure in the conduit assembly (74) for effecting rapid closing of a valve device (100) in each wheel valve (14). Each wheel valve also includes a valve device (104) providing substantially unrestricted air flow from the conduit assembly (74) to the wheels when valve device (100) is open and providing restricted air flow from the wheels to the conduit assembly (74) to ensure closing of the valve device (100 ) when the conduit is vented.

Abstract: When both main surface sides of a substrate doped with an impurity at a lower concentraiton are subjected to diffusion to form a higher concentrated impurity layer on the surfaces, about a half of the thickness of the substrate is removed to expose a layer doped with the impurity at the lower concentration on one surface of the substrate. Then the exposed lower concentrated impurity layer is polished to provide the substrate for semiconductor device comprising double layers composed of higher and lower concentrated impurities.

Abstract: A tire valve incorporates a visual gauge, an element for setting different air pressures. The valve cannot overinflate, as the valve locks at a maximum pressure. Further, an indicator actuates when underinflated, and the valve is designed to keep pressure for an indefinite period.

Abstract: A pneumatic check valve actuator assembly for a tire pressure management system uses a snap action disk to provide quick and positive on-off response.

Abstract: A piloted pneumatic valve for controlling pressure at a distance. The valve includes a cavity divided into two chambers by a membrane. One chamber is the pilot chamber, and the other the escape chamber, connected to a pressurization and depressurization circuit, connected to the controlled pressurized volume through an orifice, and to the outside air through at least one escape hole. The system also includes a piloted valve pressing the membrane against the orifice to close it, and an opening, communicating with the circuit leading to the pressurized volume, and fitted with a check valve poppet prohibiting flow back from the capacity to the circuit. For application to automotive vehicles.

Abstract: An elongated valve assembly is provided including inlet and outlet ends. The inlet end includes structure for fluid-tight sealed engagement with and support from the wall portions of a chamber defining a fluid inlet port with the outlet end of the valve assembly projecting into the chamber. The valve assembly includes a valve member longitudinally reciprocal therein between open and closed positions and having a portion thereof extendible and retractable relative to the valve assembly outlet end responsive to movement of the valve member between the closed and open positions, respectively, thereof.

Abstract: An improved wheel end valve assembly (11A) for a central tire inflation system (10) having a single connection (68) to a tire chamber (74) and a single supply connection (62) to a source ( 142) of pressurized fluid, which requires no venting other than through the single supply connection (62), is effective in response to pressurization and venting of the single supply connection (62) to open and close communication to the tire chamber (74), and which is not affected by ambient temperature changes nor susceptible to leakage into and out of a trapped air volume employed by prior art valve (11) disclosed herein. The valve (11A) is actuated by air pressure and is resiliently biased into closed position by a spring (342) positioned within an evacuated bellows (334).

Abstract: A system for inflating and deflating pneumatic tires of a vehicle through pneumatically actuated tire isolating valves which isolate air under pressure in the tires from the system comprises electronically controlled valves for achieving opening of the tire isolating valves, inflating or deflating of the vehicle tires and the quick exhausting of air under pressure from the system when the desired tire pressure is reached so as to immediately enable closure of the tire isolating valves to assure obtaining the desired pressure in the tires. Optimum rates of inflating and deflating together with accuracy in obtaining a desired tire pressure are achieved through a unique tire isolating valve construction and electronic controlled circuitry by which signals corresponding to desired and existing tire pressures are electronically compared to provide output signals by which the inflating, deflating and exhaust functions are controlled.