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A valve unit (1, 1′) for modulating the pressure in a pneumatic brake system, has a brake pressure inlet (3), a brake pressure outlet (4) and a venting outlet (5), a pneumatically controllable main valve (6, 7) and a pilot valve (8, 9), embodied as a solenoid valve and assigned to the main valve (6,

A valve unit (1, 1′) for modulating the pressure in a pneumatic brake system, has a brake pressure inlet (3), a brake pressure outlet (4) and a venting outlet (5), a pneumatically controllable main valve (6, 7) and a pilot valve (8, 9), embodied as a solenoid valve and assigned to the main valve (6, 7), which are arranged in a valve housing (2, 2′) subdivided by a plane of division (10), into a main housing (11, 11′) and a housing cover (12). For fixing the housing cover (12) on the main housing (11, 11′) a bracket element (62.1) is fixed to the main housing (11, 11′) and bears with a largely planar 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′).

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1. 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 va

1. 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), anda 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 bracket element (62.1, 62.2) includes two articulated arms (65, 66) on opposite sides of the valve housing (2, 2′) in the longitudinal direction (13), the articulated arms laterally enclosing the housing cover (12) and the main housing (11) and being pivotally fixed to the main housing (12) via an axis of articulation (69) engaging in an articulation hole (67, 68), and wherein in a longitudinal direction (13) opposite the articulated arms (65, 66), the bracket element (62.1, 62.2) is rigidly fixed to the main housing (11). 2. The valve unit as claimed in claim 1, wherein the bracket element (62.1), in a longitudinal direction (13) opposite the articulated arms (65, 66), includes a fixing clip (70), which is oriented parallel to the pressure plate (63) and has at least one hole (71), which serves for bolting the bracket element (62.1) to the main housing (11) by a bolt (72) and generating an elastic prestressing force. 3. The valve unit as claimed in claim 2, wherein the main housing (11), in a longitudinal direction (13) opposite the axis of articulation (69), comprises a columnar projection (73), which extends vertically above the plane of division (10) and includes at least one threaded hole (74) for bolted fastening of the fixing clip (70). 4. The valve unit as claimed in claim 1, wherein the bracket element (62.2), in a longitudinal direction (13) opposite the articulated arms (65, 66), includes a fixing clip (76), which is bent transversely to the pressure plate (63) and which comprises a locking hook (77), directed inwards for latching the bracket element (62.2) to the main housing (11) through engagement in an opposing latching recess (79) and by generating an elastic prestressing force. 5. The valve unit as claimed in claim 4, wherein the main housing (11), in a longitudinal direction (13) opposite the axis of articulation (69), comprises a planar projection (78), which extends perpendicularly beyond the plane of division (10) and includes—the latching recess (79) for latching of the fixing clip (76). 6. The valve unit as claimed in claim 1, wherein the bracket element (62.1, 62.2) is monolithically manufactured with the pressure plate (63), the articulated arms (65, 66), and the fixing clip (70, 76) from sheet-metal. 7. The valve unit as claimed in claim 1, wherein the articulation holes (67, 68) in the articulated arms (65, 66) each—include a cylindrical passage (80, 81). 8. The valve unit as claimed in claim 1, wherein the pressure plate (63) of the bracket element (62.1) is arched (105) in the direction of the outside wall (64) of the housing cover (12) in order to afford a central introduction of an elastic prestressing force. 9. The valve unit as claimed in claim 1, wherein the pressure plate (63) of the bracket element (62.1) comprises at least one convexity (106, 107) directed towards the outside wall (64) of the housing cover (12) for localized introduction of an elastic prestressing force. 10. The valve unit as claimed in claim 9, wherein the convexity (106, 107) is positioned and formed in the pressure plate (63) in such a way that in the assembled state of the bracket element (62.1), the convexity extends across a control chamber (51, 52) of the main valve (6, 7), the control chamber (51, 52) being delimited by the inside wall (50) of the housing cover (12). 11. 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), anda 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). 12. The valve unit as claimed in claim 11, wherein the bracket element (62.3) in the longitudinal direction (13) of the valve housing (2′) has two fixing arms (82-85) on each side, which laterally enclose the housing cover (12) and the main housing (11′) and with inwardly elbowed bends (86-89), which grip around a planar base wall (90) of the main housing (11′) remote from the plane of division (10), and at the end engage in assigned openings (92-95) in a planar base plate (91), which is fixed to the base wall (90) of the main housing (11′). 13. The valve unit as claimed in claim 12, wherein the base plate (91) has at least one hole (96, 97) on each side in a longitudinal direction (13), which serves for bolted fastening of the base plate (91) to the main housing (11′) by a bolt (98, 99) on each side. 14. The valve unit as claimed in claim 12, wherein in the assembled state at least one outwardly open connecting duct (55′) in the main housing (11′) is closed by the base plate (91), and wherein sealing elements (103, 104) are arranged between housing walls (101, 102) of the main housing (11′), defining the connecting duct (55′), and the base plate (91). 15. The valve unit as claimed in claim 12, wherein the bracket element (62.3), the fixing arms (82-85), and the base plate (91) are monolithically manufactured of one piece of sheet metal. 16. 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), anda 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).