Valve unit for modulating the pressure in a pneumatic brake system

A valve unit (1, 1′) for modulating pressure in a pneumatic brake system, comprising:

• a brake pressure inlet (3),
• a brake pressure outlet (4),
• a venting outlet (5),
• a main valve (6, 7), which is pneumatically controllable,
• a pilot valve (8, 9), embodied as a solenoid valve and assigned to the main valve (6, 7), and
• a valve housing (2, 2′) accommodating the main valve and the pilot valve, the valve housing being subdivided by a plane of division (10), extending horizontally in an installed position, into a main housing (11, 11′) and a housing cover (12),
• wherein the brake pressure inlet (3), the brake pressure outlet (4) and the venting outlet (5) are arranged in the main housing (11), the main valve (6, 7) is arranged in the main housing (11) between the brake pressure inlet (3) and the brake pressure outlet (4) with an actuation axis (14, 15) oriented perpendicular to the plane of division (10), the pilot valve (8, 9) is arranged in the housing cover (12), and at least one control chamber (51, 52) of the main valve (6, 7) is delimited by an inside wall (50) of the housing cover (12) facing the plane of division (10),
• wherein a bracket element (62.1, 62.2, 62.3) affixes the housing cover (12) on the main housing (11, 11′), which in an assembled state is fixed to the main housing (11, 11′), and which bears with a pressure plate (63) generating an elastic prestressing force on a planar outside wall (64) of the housing cover (12) oriented parallel to the plane of division (10) of the valve housing (2, 2′),
• wherein the brake pressure inlet (3) and the brake pressure outlet (4) are horizontally oriented in the main housing (11), axially opposite in a longitudinal direction (13) and with the venting outlet (5) directed vertically downwards between the brake pressure inlet (3) and the brake pressure outlet (4).

A valve unit (1, 1′) for modulating pressure in a pneumatic brake system, comprising:

• a brake pressure inlet (3),
• a brake pressure outlet (4),
• a venting outlet (5),
• a main valve (6, 7), which is pneumatically controllable,
• a pilot valve (8, 9), embodied as a solenoid valve and assigned to the main valve (6, 7), and
• a valve housing (2, 2′) accommodating the main valve and the pilot valve, the valve housing being subdivided by a plane of division (10), extending horizontally in an installed position, into a main housing (11, 11′) and a housing cover (12),
• wherein the brake pressure inlet (3), the brake pressure outlet (4) and the venting outlet (5) are arranged in the main housing (11), the main valve (6, 7) is arranged in the main housing (11) between the brake pressure inlet (3) and the brake pressure outlet (4) with an actuation axis (14, 15) oriented perpendicular to the plane of division (10), the pilot valve (8, 9) is arranged in the housing cover (12), and at least one control chamber (51, 52) of the main valve (6, 7) is delimited by an inside wall (50) of the housing cover (12) facing the plane of division (10),
• wherein a bracket element (62.1, 62.2, 62.3) affixes the housing cover (12) on the main housing (11, 11′), which in an assembled state is fixed to the main housing (11, 11′), and which bears with a pressure plate (63) generating an elastic prestressing force on a planar outside wall (64) of the housing cover (12) oriented parallel to the plane of division (10) of the valve housing (2, 2′),
• wherein the housing cover (12) comprises a central insert (30), with valve bores (20, 21;
• 22, 23) and control ports (24, 25, 26;
• 27, 28, 29) accommodating solenoids (31, 32) and mechanical components of the pilot valves (8, 9), including a respective valve core (33, 36), a respective valve armature (34, 37), and a respective valve spring (35, 38), the central insert (30) being overmolded with plastic (39).