A distributor valve for a brake control system of a railway vehicle is provided with an access interface that includes a plurality of access ports for measuring the operational pressures of the distributor valve. The distributor valve includes a pipe bracket and a main line and main portions mounted on the pipe bracket. The pipe bracket includes a plurality of passages for communicating the main portion and the main line portion with each other and with a brake pipe, brake cylinder, and reservoir of the brake control system. The plurality of access ports of the access interface includes ports in communication with the working chamber passage, valve chamber passage, brake pipe passage, reservoir passage, and the brake cylinder passage of the pipe bracket.

A pre-filling device for a braking system. The pre-filling device includes a pre-filling channel, a pre-filling pressure being inside the channel when the braking system is in a rest and hydro-boost position, and a mechanical valve configured to be opened following a transition from the rest and hydro-boost position to a working position of the braking system; and a hydraulic valve cooperating with the mechanical valve setting the pre-filling pressure inside the channel. The hydraulic valve includes in a first area, facing the mechanical valve, a hole communicating with the channel, and in a second area, hydraulically isolated from the first area, a preloaded resilient element in a chamber held at atmospheric pressure. The hydraulic valve is configured to be connected or not to be connected, by a reciprocating movement inside the channel, to a hydro-booster device and to keep a predetermined pre-filling pressure upon varying of the hydro-boost pressure.

A pre-filling device for a braking system. The pre-filling device includes a pre-filling channel, a pre-filling pressure being inside the channel when the braking system is in a rest and hydro-boost position, and a mechanical valve configured to be opened following a transition from the rest and hydro-boost position to a working position of the braking system; and a hydraulic valve cooperating with the mechanical valve setting the pre-filling pressure inside the channel. The hydraulic valve includes in a first area, facing the mechanical valve, a hole communicating with the channel, and in a second area, hydraulically isolated from the first area, a preloaded resilient element in a chamber held at atmospheric pressure. The hydraulic valve is configured to be connected or not to be connected, by a reciprocating movement inside the channel, to a hydro-booster device and to keep a predetermined pre-filling pressure upon varying of the hydro-boost pressure.

A control valve includes a diaphragm with a flow path with a predetermined cross-section from a brake pipe to a first side of the diaphragm and another flow path having another predetermined cross-section from a second side of the diaphragm to atmosphere. A dump valve prevents flow from the brake pipe to atmosphere. A method for operating a control valve includes supplying brake pipe air to a first side of a diaphragm through a flow path having a predetermined cross-section and permitting or preventing reference air flow to atmosphere through another flow path having another predetermined cross-section. The method further includes supplying reference air to a dump valve that prevents brake pipe air flow to atmosphere.

A control valve includes a diaphragm with a flow path with a predetermined cross-section from a brake pipe to a first side of the diaphragm and another flow path having another predetermined cross-section from a second side of the diaphragm to atmosphere. A dump valve prevents flow from the brake pipe to atmosphere. A method for operating a control valve includes supplying brake pipe air to a first side of a diaphragm through a flow path having a predetermined cross-section and permitting or preventing reference air flow to atmosphere through another flow path having another predetermined cross-section. The method further includes supplying reference air to a dump valve that prevents brake pipe air flow to atmosphere.

A brake distributor valve for a Russian railway vehicle includes a body defining a brake pipe passageway configured to be in fluid communication with a brake pipe, a reservoir passageway configured to be in fluid communication with a reservoir, and a reference pressure passageway configured to be in fluid communication with a reference pressure source. The brake distributor valve includes a service accelerated release valve having a valve member with a first position where the brake pipe passageway is isolated from the reservoir passageway and a second position where the brake pipe passageway is in fluid communication with the reservoir passageway. The valve member is configured to supply pressure from the reservoir passageway to the brake pipe passageway during a brake release event, where the valve member is actuated between the first and second positions based on a pressure within the reference pressure passageway.

A brake distributor valve for a Russian railway vehicle includes a body defining a brake pipe passageway configured to be in fluid communication with a brake pipe, a reservoir passageway configured to be in fluid communication with a reservoir, and a reference pressure passageway configured to be in fluid communication with a reference pressure source. The brake distributor valve includes a service accelerated release valve having a valve member with a first position where the brake pipe passageway is isolated from the reservoir passageway and a second position where the brake pipe passageway is in fluid communication with the reservoir passageway. The valve member is configured to supply pressure from the reservoir passageway to the brake pipe passageway during a brake release event, where the valve member is actuated between the first and second positions based on a pressure within the reference pressure passageway.

A main piston bushing for a service valve portion of a brake control valve includes a cylindrical sidewall defining a central passageway extending longitudinally through the main piston bushing, the central passageway being surrounded by an internal surface of the cylindrical sidewall. The central passageway is configured to receive the main piston assembly of the service valve portion. The internal surface of the cylindrical sidewall includes a first ramp and a second ramp defined therein, the first ramp and the second ramp being configured to engage a portion of the main piston assembly of the service valve portion to restrain movement of the main piston assembly.

A main piston bushing for a service valve portion of a brake control valve includes a cylindrical sidewall defining a central passageway extending longitudinally through the main piston bushing, the central passageway being surrounded by an internal surface of the cylindrical sidewall. The central passageway is configured to receive the main piston assembly of the service valve portion. The internal surface of the cylindrical sidewall includes a first ramp and a second ramp defined therein, the first ramp and the second ramp being configured to engage a portion of the main piston assembly of the service valve portion to restrain movement of the main piston assembly.