Abstract: A sealed, double valve assembly mounted on a vehicle body is connected to a source of pressurized air and controls the air pressure delivered to two auxiliary systems connected to it. The first auxiliary system is a brake force regulator and the second auxiliary system is a headlight beam adjustment mechanism which uses a pneumatic servo-member.Control rods connected to the axle change the degree of compression of a control spring in the double valve assembly, thereby opening or closing valves which admit or release compressed air so as to change the operating pressure of the associated auxiliary systems.

Abstract: A brake control valve apparatus is proposed for the respective cars of a train controlled from one end or the other to be braked by an analogue signal of variable mark-to-space form which operates on each car to gate bursts of train-wire carried a.c. supply which after rectification are used to regulate the brake pressure via an E.P. converter. Additionally in order to enable release of a braked car which fails to release its brake in a tunnel, a train brake release wire is provided which in one example operates in an energized-to-release mode to release a single failed brake or in another example operates in a de-energized to release mode to connect local supplies to operate dump valves on all the brake actuators of the train so providing total release in addition to the normal release by the control valve.

Abstract: A reducing valve which performs proper vehicle braking control in proportional response to the load being carried on the vehicle by sealing off a hydraulic braking pressure, which is regulated to be proportional to the load on the vehicle, in a control chamber through the use of a control valve for the control of the pressure reducing function of the reducing valve. The control valve is regulated to remain open, in opposition to the applied hydraulic pressure from the braking pressure source, in proportion to the increase of vehicle load thereby correspondingly raising the reduction starting pressure of the reducing valve which reduces the braking hydraulic pressure to the rear wheel brakes of the vehicle.

Abstract: A load-dependent two-circuit brake for vehicles, especially for trucks, busses or the like which includes a load-dependent control valve arranged in the first brake circuit containing the rear-wheel brakes while another control valve is coordinated to the second brake circuit containing the front wheel brakes which has a predetermined transmission ratio and which is adapted to be acted upon by the control pressure in the first brake circuit in such a manner that the transmission ratio is adapted to be changed in the same sense as the control pressure in the first brake circuit.

Abstract: A compensating air reservoir for changing the braking force of the brakes of a car, such as a railway car intended to transport particulate material, is connected to the air line which supplies air to the brake cylinder and piston assembly of the car. The air reservoir has a movable wall forming a portion of the car wall and directly engageable by said material. The movable wall controls a valve on a wall of the reservoir so that when the car is empty, the valve is open permitting air to flow into the reservoir, thereby reducing the braking force, and so that when the car is loaded, the valve is closed, thereby permitting maximum braking force. The maximum pressure in the reservoir is limited by a limiting valve, and in modified embodiments, the valve which controls the admission of air to the reservoir does not open until the braking air pressure reaches a predetermined level. Two or more reservoirs are used to provide more than two braking force levels.

Abstract: A brake pressure limiting device is disclosed for use in a dual-circuit vehicle brake system. The device comprises two valve bodies arranged on a common axis. Each valve body has one inlet for connection with a master brake cylinder and at least one brake line outlet. The pressure at the outlet can be isolated from that at the inlet by a valve element which is axially movable within the valve body between an open and a closed position. Movement of both valve elements in the two valve bodies is controlled by a common actuating member which causes the valve elements to close when the pressures at the valve body inlets exceed a limiting value that is a function of the vehicle load.

Abstract: A brake pressure limiting or reducing valve has its cut-off or operating pressure determined in accordance with vehicle loading through the agency of a simple tension spring connected directly between a movable member of the valve and a portion of the vehicle which is subject to vertical movement, relative to the valve, in response to changes in the loading of the vehicle.

Abstract: A load sensitive proportioning valve for an automotive vehicle having a source of hydraulic fluid and front and rear hydraulically actuated brake systems, the proportioning valve being operable to modulate the brake pressure in one of the brake systems to provide for a reduced brake effect at the rear wheels relative to that at the front wheels to compensate for the weight transfer during braking, the valve including a modulating piston movable between positions opening and closing a flow path from the fluid source and the one brake system a first bias producing element for providing a force to move the piston element as a function of the magnitude of the deceleration of the vehicle, and a second bias producing element providing a force to move the piston in response to the fluid pressure of the one system and the modulated fluid pressure of the proportioning valve, whereby the modulating effect of the proportioning valve compensates for variations in loading of the vehicle.

Abstract: A brake valve for a motor vehicle brake system is interposed in the brake line between the master cylinder and the rear wheel brakes and is constructed to limit the fluid pressure at the rear brakes relative to the pressure at the front brakes during the application of master cylinder pressure. Pressure is limited at the rear brakes for the purpose of balancing the front and rear brakes in accordance with their relative effectiveness. The valve includes an inertia sensor that senses the rate of vehicle deceleration and modulates the pressure ratio between the front and rear brakes accordingly. The valve mechanism with its inertia sensor provides a device for compensating for the amount of load carried by the vehicle which, in turn, affects the relative effectiveness of the front and rear brakes.

Abstract: This invention relates to automobile braking systems of the kind that employ a device for limiting braking pressure and intended particularly for systems which have separate supply circuits for the front and rear-wheel brakes. Such limiting devices conventionally comprise a limiter body which has an inlet orifice and an outlet orifice with a valve mounted therein for cutting off the inlet orifice from the outlet orifice, a movable piston subject to the hydraulic pressure at the inlet orifice, an inertial mass which is capable of movement with respect to the body, load-sensitive means and elastic means for co-operation with the inertial mass and the piston.

Abstract: In a load-responsive air braking system for a railway vehicle an electrical signal is transmitted from a brake controller actuated by an operator when he intends to apply a braking force. The signal is transmitted to a signal converter consisting of an electromagnet having a movable armature therein which contacts an end of a balance beam with a force corresponding to the electrical signal. The balance beam actuates a double valve which has a vent to the atmosphere and is connected between the braking cylinder and an air reservoir.

Abstract: A pneumatic control device with programmed characteristic, particularly for a vehicle braking device, wherein it comprises a pilot reducing valve connected respectively to a source of compressed fluid supply, to the atmosphere and to a fluid outlet conduit terminating in a pneumatic control member, the reducing valve comprising members for controlling the passage of the fluid whose operation is connected with programming device whose characteristics are capable of being corrected by the use of applying different parameters.