A valve fitting includes a fitting body defining a fitting passageway, supply and working ports in fluid communication with the fitting passageway, a supply port coupler operable to connect the supply port with an associated feed port coupler providing a pressurized fluid, a working port coupler operable to connect the working port with an associated tire of a tire assembly of an associated work vehicle, a supply valve moveable in the fitting passageway between a first position closing the fitting passageway from the supply port and a second position opening the fitting passageway to the supply port, a biasing assembly biasing the supply valve towards the first position, and an actuator assembly comprising an actuator member operable to urge the supply valve towards the second position against the bias of the biasing assembly in response to the associated feed port coupler being connected with the supply port coupler.

A tire inflation system includes a first component rotating relative to a second component, a first passageway between the first and second components, the first passageway connecting a pressure source to a pressure consumer, a first seal in contact with an interface between the first and second components, the first seal maintaining pressurized fluid in the first passageway, a second seal in contact with the interface between the first and second components, the second seal spaced apart from the first seal forming a first chamber, a third seal in contact with the interface between the first and second components, the third seal spaced apart from the second seal forming a separate second chamber, and a second passageway connected to the separate second chamber and to the atmosphere.

A tire-inflation system for a small trailer may include a fluid pressure source mountable to the trailer, and air conduits providing sealed fluid communication between the air pressure source and the small trailer's pneumatic tires.

A valve fitting includes a fitting body defining a fitting passageway, supply and working ports in fluid communication with the fitting passageway, a supply port coupler operable to connect the supply port with an associated feed port coupler providing a pressurized fluid, a working port coupler operable to connect the working port with an associated tire of a tire assembly of an associated work vehicle, a supply valve moveable in the fitting passageway between a first position closing the fitting passageway from the supply port and a second position opening the fitting passageway to the supply port, a biasing assembly biasing the supply valve towards the first position, and an actuator assembly comprising an actuator member operable to urge the supply valve towards the second position against the bias of the biasing assembly in response to the associated feed port coupler being connected with the supply port coupler.

A rotary union for a tire inflation system includes an axle housing and a wheel axle rotatably mounted in the axle housing. The wheel axle has a flange for attachment of a wheel rim. The wheel axle is received by a passage socket that is connected for conjoint rotation to the wheel axle and supported by a radial bearing relative to a bearing seat within the axle housing. A compressed air duct is disposed inside a cylindrical wall of the passage socket such that the compressed air duct is connected at one end to a pressure connector mounted on the axle housing and at the other end to a tire connector mounted on the passage socket. The passage socket is sealed rotationally movably with respect to an adjacent inner side of the axle housing such that an enclosed chamber is formed between the pressure connector and the compressed air duct.

A rotary joint is configured to transfer a fluid between two entities, one of which is in rotary motion with respect to the other. The rotary joint comprises a cylindrical internal element, apt to be fixed to the entity in rotary motion, and a plurality of annular external elements. The external elements comprise at least two head elements, at least two housing elements of respective gaskets, two bearing elements, and at least one fluid inlet. The fluid inlet is placed between said two bearing elements. Housing elements of respective gaskets are arranged externally to the bearing elements, and head elements are arranged externally to the housing elements. The gaskets define an annular shaped sealed area. The sealed area is accessible on one side through said fluid inlet and on the other side through at least one fluid passage channel passing through the body of said internal element.

A rotary joint assembly for a tire inflation system includes a rotating portion. The rotating portion is attached to a wheel rim for rotation therewith. The rotating portion includes a center portion which has an air passageway formed therein. The rotary joint assembly also includes a non-rotating portion. The non-rotating portion has a non-rotating portion air passageway formed therein. The non-rotating portion air passageway is in fluid communication with the air passageway formed in the rotating portion via a chamber. A pair of annular sealing members are attached to the rotating portion and sealingly contact a sealing surface of the non-rotating portion. The annular sealing members define an inboard end and an outboard end of the chamber.

A tire pressure regulating system is disclosed for adjusting tire pressures of pneumatic tires of vehicle wheels of a plurality of vehicle axles of a motor vehicle while driving. The tire pressure regulating system comprises: at least one switchover valve, an axle valve, a wheel valve and a valve. A motor vehicle comprising the tire pressure regulating system is also disclosed.

A tire deflation and inflation system for a vehicle. The system includes a unit bearing having a plurality of wheel flanges for mounting a wheel thereto. The unit bearing is configured to receive therein a portion of an axle of the vehicle. A wheel hub is mounted to the unit bearing. An air chamber is defined by the unit bearing. In response to positive air pressure generated by an air pressure source, air flows through the air chamber to a tire of the wheel mounted to the unit bearing to increase air pressure of the tire. In response to negative air pressure generated by venting the system to atmosphere, air is drawn out of the tire through the air chamber.

A combination includes at least: an air line disposed between a rotary union and a tire; and a tire pressure management safety valve disposed within the air line. The air line facilitates pressurized fluid transferred between the rotary union and a valve stem of the tire, to inflate the tire, and the tire pressure management safety valve includes: a valve housing providing a valve activation chamber; a fluid conduit having a downstream end and an upstream end; a check valve disposed within the valve activation chamber, the check valve responsive to pressurized fluid within the air line, at a predetermined pressure the check valve automatically precludes air transfer through the fluid conduit; and a fitting communicating with the check valve activation chamber and the valve stem of the tire. The combination further includes a tire pressure measurement sensor interacting with the check valve activation chamber and the inflated tire.