Abstract: Electropneumatic control valve for a pneumatic brake system of a vehicle having a relay valve housing in which an axially adjustable control piston is arranged for actuating a valve seat arrangement which switches the compressed-air flow between at least one exterior brake line connection, a supply pressure connection and a bleeder connection. The control piston is axially guided by means of a coaxial guiding arrangement. The guiding arrangement comprises a separate guiding sleeve which is stationarily fastened to the pilot valve housing and which is provided with an upper guiding section which, for the axial guidance, corresponds with a passage bore in the control piston, and which, in addition, has a lower tube section of a smaller outside diameter adjoining the upper guiding section in order to guide the outgoing air flowing through an integrated axial bleeder duct directly to the bleeder connection.

Abstract: Electropneumatic control valve for a pneumatic brake system of a vehicle having a relay valve housing (1) in which an axially adjustable control piston (5) is arranged for actuating a valve seat arrangement (8) which switches the compressed-air flow between at least one exterior brake line connection (11), a supply pressure connection as well as a bleeder connection (13), the control piston (5) being axially guided by means of a coaxial guiding arrangement and being capable of being acted upon by way of at least one electromagnetic pilot valve (6) for the axial adjustment, which pilot valve (6) is accommodated in a pilot valve housing (2) connected with the relay valve housing (1), in which case the guiding arrangement of the control piston (5) according to the invention comprises a separate guiding sleeve (17) which is stationarily fastened to the pilot valve housing (2) and which is provided with an upper guiding section (19) which, for the axial guidance, corresponds with a passage bore (18) in the control

Abstract: A three dimensional filter element of a porous fabric of synthetic fibers wherein the individual threads are bound to each other as to be unshiftable, said fabric having an air permeability of more than 50 l/dm.sup.2 . min at a pressure difference of 2 millibar and resisting to a permanent load over the entire filter area without the formation of free regions and a method for the separation of solid material from a liquid phase by means of the three-dimensional filter element preferably by gravity.