A quick connector structure for a pneumatic valve contains a body, at least one locking unit, and a control set. The body includes at least one inserting hole and an air intake, wherein an airtight washer is fixed between the at least one inserting hole. The body also includes at least one through orifice. The at least one locking unit includes at least one limiting block, each of which has a retaining segment with plural locking teeth and has a defining segment, and between each limiting block and the at least one through orifice is defined a closing ring to close an air flowing gap between each limiting block and the at least one through orifice. The control set is fitted with the body and alternatively presses the defining segment to control each limiting block to move into and to position in the at least one inserting hole.

A tire management system is provided for automatically inflating and deflating tires of a vehicle. The system comprises: couplings, for releasably coupling to each of the tires of the vehicle; an inlet, for receiving compressed gas, the inlet selectively couplable to the couplings for inflating the tires of the vehicle; an outlet, selectively couplable to the couplings for deflating the tires of the vehicle; and a controller, configured to receive a desired target pressure for one or more of the tires and automatically couple the inlet or outlet to the one or more tires to achieve the target pressure. The tires are grouped into two or more groups of tires, and wherein the controller is configurable to inflate and/or deflate the tires according to the groups of tires.

An air chuck for use with tire stems (or other air vessels) that use Schrader valves. In some embodiments, the air chuck has an outer threaded part that is rotated to urge a core with an O-ring to form a seal with the inner surface of the tire stem, preventing air leaks. The air chuck attaches via a single multi-turn rotary motion, which first creates the seal and then depresses the Schrader valve to allow air flow. This design offers improved air-pressure accuracy, simplicity, efficiency, ease of use, and reliability. Some embodiments further include a manually operable air valve and an air-pressure gauge operatively coupled to the air chuck.

An air valve connector includes a head and a switching assembly. The head has a first insertion hole, a second insertion hole, a communicating passage, and an inlet hole. The first insertion hole is provided with a first airtight portion disposed between the communicating passage and the inlet hole, and a second airtight portion disposed between the inlet hole and the first port. The switching assembly includes a plunger movably disposed in the first insertion hole to alternately abut against the first airtight portion or the second airtight portion.

An air valve connector includes a head and a switching assembly. The head has a first insertion hole, a second insertion hole, a communicating passage, and an inlet hole. The first insertion hole is provided with a first airtight portion disposed between the communicating passage and the inlet hole, and a second airtight portion disposed between the inlet hole and the first port. The switching assembly includes a plunger movably disposed in the first insertion hole to alternately abut against the first airtight portion or the second airtight portion.

A valve stem for controlling inflation and deflation is provided. The valve stem includes a valve body having a central passage and a lateral port venting to the atmosphere. A valve core can be positioned within the central passage and configured to permit gas flow into the central passage. A collar is configured to surround an intermediate portion of the valve body, with the collar movable between a first position, where the collar occludes the lateral port to prohibit gas flow out of the lateral port, and a second position, where the collar opens the lateral port to permit gas flow from the central passage through the lateral port. A pressure set assembly can couple to the valve body and be set to a pressure at which the pressure set assembly closes to prohibit gas flow through the pressure set assembly and through the lateral port.

Valves and related systems are described for equalization of pressure between vehicle tires. Valves may, for example, comprise a valve body which selectively opens when a vehicle is in motion so as to selectively allow two-way communication between vehicle tires.

An air inflation-deflation valve includes an inflation head, a rubber seat, an inner sleeve, a shell, a first elastic part, a plug chamber, an air inlet rubber plug, a second elastic part and an air outlet rubber plug. When the air inflation-deflation valve is in use, the inflation head is inserted into a rubber chamber to contact an air port, external air enters an air passage, pushing open the air inlet rubber plug, and then enters inner chambers of inflatable products. After inflation, the second elastic part blocks the air passage. During deflation, the inflation head drives the rubber seat and inner sleeve to move, causing the air outlet port to open, thus the air is discharged through the inflation head. An overall structure of the air inflation-deflation valve is simple, easy to use, quick for inflation and deflation, and meets needs of various inflatable products.

An air inflation-deflation valve includes an inflation head, a rubber seat, an inner sleeve, a shell, a first elastic part, a plug chamber, an air inlet rubber plug, a second elastic part and an air outlet rubber plug. When the air inflation-deflation valve is in use, the inflation head is inserted into a rubber chamber to contact an air port, external air enters an air passage, pushing open the air inlet rubber plug, and then enters inner chambers of inflatable products. After inflation, the second elastic part blocks the air passage. During deflation, the inflation head drives the rubber seat and inner sleeve to move, causing the air outlet port to open, thus the air is discharged through the inflation head. An overall structure of the air inflation-deflation valve is simple, easy to use, quick for inflation and deflation, and meets needs of various inflatable products.

A rotary feed-through, designed to transfer a fluid between two entities in rotary motion with respect to one another. The rotary feed-through includes an inner cylindrical ring and an outer cylindrical ring, which are free to turn with respect to one another and provided with channels for passage of the fluid. The channels are connected via at least one annular space axially delimited by seal rings housed in a cylindrical seat. The cylindrical seat faces radially outwards or inwards and is axially delimited, on one side, by an axial abutment of the inner and outer cylindrical rings and, on the other side, by an axial abutment of a lid, a closing ring, or an intermediate ring. The seal rings are interference fitted to the inner or outer cylindrical ring and provided with an elastic portion for contact with the surface of the inner or outer cylindrical ring.