Axle valve module and relay valve module of a compressed-air brake system

An axle valve module (2′, 2″) for a compressed air brake system for actuating wheel brakes of a vehicle axle of a wheeled vehicle, the axle valve module comprising:

• a relay valve (26), and
• a control pressure input (36) connected to a control pressure line (48) configured to be alternately connected via a changeover valve (50, 74) to a brake pressure line (20, 20′) conducting an introduced brake pressure or to a reservoir pressure line (14, 14′) conducting a reservoir pressure, and with an ABS inlet valve (28, 32) and an ABS outlet valve (30, 34) for at least one wheel brake cylinder on each side of the vehicle axle, wherein each of the ABS inlet and outlet valves is formed as a pressure-controlled diaphragm valve with an associated pilot valve (62, 64, 66, 68), wherein the pilot valves (62, 64, 66, 68) are configured as cyclically controllable 3/2-way magnetic switching valves configured to load a the control pressure chamber of the associated diaphragm valve (28, 30, 32, 34) with a control pressure alternatively taken from an axle brake line (56) connected to a working pressure output (40) of the relay valve (26) or from the control pressure line (48) of the relay valve (26), or with ambient pressure,
• wherein a shut-off valve (76, 78) is arranged in the control pressure line (48) leading to the relay valve (26), between the changeover valve (50, 74) and the control pressure input (36) of the relay valve (26) or a branch point of an ABS control pressure line (70′) for the ABS inlet and outlet valves (28, 30, 32, 34), the shut-off valve being configured to selectively lock in the control pressure present at the control pressure input (36) of the relay valve (26);
• wherein no bypass pressure line is provided from the relay valve such that the control pressure present at the control pressure input is selectively locked in by the shut-off valve;
• and
• wherein the changeover valve (74) is configured as a cyclically controllable 3/2-way magnetic switching valve with a non-actuated state and an actuated state, with a first compressed air input to which the brake pressure line (20′) is connected, with a second compressed air input to which the reservoir pressure line (14′) is connected, and with a compressed air output to which the control pressure line (48) of the relay valve (26) is connected, wherein the first compressed air input is connected to the compressed air output in the non-actuated state and is blocked therefrom in the actuated state, and the second compressed air input is blocked against the compressed air output in the non-actuated state and connected thereto in the actuated state;
• wherein the changeover valve is biased toward the non-actuated state.