A controller for controlling a pneumatic control valve (PCV) in a central tire inflation system (CTIS). The controller includes an electronic processor having an electrical input for receiving a supply-side pressure signal. The electronic processor is configured to control a first control valve (V.sub.INSS) to generate a pneumatic control signal for changing an operating state of a pneumatic control valve (PCV). The electronic processor also monitors the supply-side pressure signal and identifies a change in the operating state of the pneumatic control valve (PCV) in dependence on a change in the supply-side pressure. The electronic processor is configured to output a first valve close signal upon determining that the pneumatic control valve (PCV) has changed operating state. Also provided is a CTIS incorporating a controller; to a vehicle; and to a method of controlling a pneumatic control valve (PCV).

Disclosed herein are valve assemblies, such as for use in a tire inflation system, the valve assemblies comprising: a first fluid port and a second fluid port fluidly connectable with one another via a fluid passage; a first valve having an open position and a closed position, the first valve in its closed position blocking the fluid passage and in its open position unblocking the fluid passage; a second valve having an open position and a closed position, the second valve in its closed position blocking the fluid passage and in its open position unblocking the fluid passage; and a control volume fluidly connected or fluidly connectable with the first fluid port via a flow restrictor, wherein the first valve, the second valve and the control volume are configured such that a fluid pressure in the control volume biases each of the first valve and the second valve toward their closed position.

A load based tire pressure regulation system for trucks or trailers employing an air spring maintained at a variable pressure P.sub.AS depending upon the load on the truck or trailer, includes an air pilot pressure regulator receiving air at pressure P.sub.AS and air at the pressure of at least one tire of a truck or trailer, and configured to feed air to and bleed air from the at least one tire of the truck or trailer as a function of the load on the truck or trailer. The pressure regulator is configured to feed air to and bleed air from the at least one tire of the truck or trailer based upon the pressure of the air spring P.sub.AS as a function of the load on the air spring (F.sub.AS), and further upon the recommended pressure P.sub.T of the at least one tire as a function of the load on the tire (F.sub.T).

The present disclosure relates to a valve assembly, in particular for use in a tire inflation system, the valve assembly comprising: a valve body comprising a first fluid port and a second fluid port; a piston disposed at least partially within the valve body and configured to be moved relative to the valve body between an open position and a closed position, wherein when the piston is in the open position the first fluid port is fluidly connected with the second fluid port, and wherein when the piston is in the closed position the first fluid port is fluidly isolated from the second fluid port, wherein when the piston is in the open position the first fluid port and the second fluid port are fluidly connected with one another via a fluid channel extending through the piston. The present disclosure further relates to a tire inflation system including said valve assembly.

A rotary feedthrough assembly for a tire inflation system for a vehicle. The assembly may have a stationary part including a first section of a main fluid line and a first section of a pilot fluid line. A rotatable part may be rotatably mounted on the stationary part support a pneumatic tire. The rotatable part may have a second section of the main fluid line and a second section of the pilot fluid line. A first annular seal chamber may be radially disposed between the stationary part and the rotatable part. The first annular seal chamber may provide fluid communication between the first section of the main fluid line and the second section of the main fluid line. A second annular seal chamber may be radially disposed between the stationary part and the rotatable part. The second annular seal chamber may provide fluid communication between the first section of the pilot fluid line and the second section of the pilot fluid line.

A dual wheel tyre inflation pressure control system including a pair of vehicle wheels having tyre interiors providing first and second fluid chambers. A first valve arrangement is installed remote from the wheels and is connectable to a pressurised fluid source. A second valve arrangement, suitably mounted on one of the wheels, is connected to the first valve arrangement by means of first and second fluid connections. The second valve arrangement is controllably operable to connect the first fluid connection to either fluid chamber. Controlled variation of fluid pressure in and between the fluid connections is provided by the first valve arrangement to control said second valve arrangement for operating the tyre pressure control system to connect the second fluid chamber to the first valve arrangement, and to connect the first and second fluid chambers.

An inflation/deflation system for a tire in tire systems such as those having an inner bladder and an outer ground engaging tire is provided in which the inflation/deflation system is adapted to inflate/deflate a tire, inflate a bladder, and inflate a tire utilizing pressurized air from the bladder. The system utilizes a specialized valve and passageway system which utilizes pressurized fluid to operate a timer wheel valve to inflate the tire and/or bladder without requiring electric power at the wheel and utilizes a low power function to inflate the tire from the bladder. The utilization of the bladder to provide a quick tire inflation is particularly useful in agricultural applications utilizing tire with large volumes.

A method of setting the rides height of the air springs and air pressures of the tires, including receiving a user selected setting or preprogrammed ride height settings; sensing a ride height of, and air pressure within, each of the air springs; determining the weight of the vehicle based on the sensed ride height and air pressure within each of the air springs; providing specified ride heights for the left and right front and rear air springs; determining specified air pressures for the left and right front and rear tire inflators, based upon the determined weight of the vehicle and selected setting; inflating the left and right front and rear air springs to the specified ride heights; and inflating the left and right front and rear tires to the specified air pressures.

An inflation viewing device has a main body which is externally provided with a transparent viewing portion and internally provided with an inner passage where an air path assembly is arranged. An air entrance connector is operatively connected to an external air source and to a first end of the main body. An air exit connector is connected to a second, opposed end of the main body and to an inflation valve. A guide spacer is provided between the air entrance connector and the main body. The guide spacer has an inner passage having a wider section in communication with the inner passage of the main body and a reduced section defining a communication opening with the air entrance connector. A filter is arranged in the communication opening. A plunger, biased by a spring, is slidably arranged within the inner passage of the guide spacer and guide section of the main body inner passage.

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.