VALVE UNIT FOR MODULATING PRESSURE IN A COMPRESSED-AIR BRAKE SYSTEM

• Main Authors: TEICHMANN, Andreas, BIALON, Rafal
• Format: Patent
• Language: English; French; German
• Published: 24.10.2018
• Subjects: ACTUATING-FLOATS; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; BLASTING; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; COCKS; DEVICES FOR VENTING OR AERATING; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OFVEHICLES; TAPS; THERMAL INSULATION IN GENERAL; TRANSPORTING; VALVES; VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES; VEHICLES IN GENERAL; WEAPONS

A valve unit for modulating pressure in a compressed-air brake system comprises an inlet valve (6) and an outlet valve (7) configured as diaphragm valves, a brake pressure output (4) configured to be connected to or shut off from a brake pressure input (3) or a vent output (5), two pilot valves (8, 9) configured as 3/2-way solenoid valves, and a respective control chamber (31, 32) adjacent to the diaphragm (17, 18) of the diaphragm valves (6, 7). The diaphragms (17, 18) are each clamped between two housing parts (11, 14; 11′, 14′) via a respective ring bead (22, 23) placed in a housing-side ring groove (20, 21; 20′, 21′). In order to avoid damaging the diaphragms (17, 18), an annular continuous or partially interrupted recess (54) is arranged in the ring groove (20, 21) or immediately adjacent to the ring groove to receive displaced bead material from the diaphragm (17).