Diaphragm valve without a supporting ring and without a supporting plate

A pressure control valve arrangement for controlling a fluid pressure in a pressure medium-actuated and slip-regulated brake system of a vehicle, in which, during the slip regulation, the brake pressure is increased, held or reduced in at least one brake cylinder, comprising:

• a holding or inlet diaphragm valve and an outlet diaphragm valve, and also two electromagnetic pilot control valves which are able to be activated by an electronic control device and which serve for the pilot control of the diaphragm valves are in a housing of the pressure control valve arrangement;
• wherein the holding or inlet diaphragm valve, in an open position, passes a pressure medium through into the at least one brake cylinder and, in a closed position, prevents the pressure medium being fed into the at least one brake cylinder,
• wherein the outlet diaphragm valve, in an open position, connects the at least one brake cylinder to a pressure sink and, in a closed position, blocks the connection between the at least one brake cylinder and the pressure sink,
• wherein of the holding or inlet diaphragm valve and the outlet diaphragm valve, at least the holding or inlet diaphragm valve is formed by a diaphragm valve, which includes:
• an elastomer diaphragm, which is held in or on a valve housing via a radially outer edge bead and interacts with a diaphragm valve seat;
• a first control chamber, which is delimited by a first surface, facing away from the diaphragm valve seat, of the elastomer diaphragm and is able to be loaded and relieved of load by the pressure medium, wherein, when the first control chamber is loaded by the pressure medium, the elastomer diaphragm is pushed against the diaphragm valve seat;
• a second control chamber, which is delimited by a second surface, facing away from the first surface, of the elastomer diaphragm and is able to be loaded and relieved of load by the pressure medium and surrounds the diaphragm valve seat, wherein, when the second control chamber is loaded by the pressure medium, the elastomer diaphragm has the tendency to lift off from the diaphragm valve seat and in the process the second control chamber is connected to a pressure medium flow channel, on which the diaphragm valve seat is formed at an end side;
• wherein the pressure medium flow channel, the diaphragm valve seat and the elastomer diaphragm are arranged in a manner coaxial with one another with respect to an axial direction, wherein an inner diameter of the pressure medium channel is 7.5 mm to 9.5 mm,
• wherein the Shore hardness of the elastomer diaphragm is at least 40 Shore A, and
• wherein the smallest thickness of the elastomer diaphragm in a central region of the elastomer diaphragm, which central region, as seen in relation to a radial direction perpendicular to the axial direction, is situated within the diaphragm valve seat, is at least 30% of the inner diameter of the pressure medium channel.

A slip-regulated, pressure medium-actuated brake system of a vehicle, comprising:

• at least one pressure control valve device, wherein, during the slip regulation, the brake pressure is increased, held or reduced in at least one brake cylinder;
• wherein the pressure control valve device includes:
• two diaphragm valves, including a holding or inlet diaphragm valve and an outlet diaphragm valve, and also two electromagnetic pilot control valves which are able to be activated by an electronic control device and which serve for the pilot control of the diaphragm valves are in a housing of the pressure control valve arrangement;
• wherein the holding or inlet diaphragm valve, in an open position, passes a pressure medium through into the at least one brake cylinder and, in a closed position, prevents the pressure medium being fed into the at least one brake cylinder,
• wherein the outlet diaphragm valve, in an open position, connects the at least one brake cylinder to a pressure sink and, in a closed position, blocks the connection between the at least one brake cylinder and the pressure sink,
• wherein of the holding or inlet diaphragm valve and the outlet diaphragm valve, at least the holding or inlet diaphragm valve is formed by a diaphragm valve, and
• wherein the diaphragm valve includes:
• an elastomer diaphragm, which is held in or on a valve housing via a radially outer edge bead and interacts with a diaphragm valve seat;
• a first control chamber, which is delimited by a first surface, facing away from the diaphragm valve seat, of the elastomer diaphragm and is able to be loaded and relieved of load by the pressure medium, wherein, when the first control chamber is loaded by the pressure medium, the elastomer diaphragm is pushed against the diaphragm valve seat;
• a second control chamber, which is delimited by a second surface, facing away from the first surface, of the elastomer diaphragm and is able to be loaded and relieved of load by the pressure medium and surrounds the diaphragm valve seat, wherein, when the second control chamber is loaded by the pressure medium, the elastomer diaphragm has the tendency to lift off from the diaphragm valve seat and in the process the second control chamber is connected to a pressure medium flow channel, on which the diaphragm valve seat is formed at an end side;
• wherein the pressure medium flow channel, the diaphragm valve seat and the elastomer diaphragm are arranged in a manner coaxial with one another with respect to an axial direction, wherein an inner diameter of the pressure medium channel is 7.5 mm to 9.5 mm,
• wherein the Shore hardness of the elastomer diaphragm is at least 40 Shore A, and
• wherein the smallest thickness of the elastomer diaphragm in a central region of the elastomer diaphragm, which central region, as seen in relation to a radial direction perpendicular to the axial direction, is situated within the diaphragm valve seat, is at least 30% of the inner diameter of the pressure medium channel.