BRAKE PRESSURE CONTROL VALVE

摘要

A brake pressure control valve (1) for use on a vehicle having a modulated self-levelling air suspension system comprises a valve body (2) sealingly secured to the wall (4) of a pressure chamber of the suspension system to close an aperture (7) in the wall. A brake pressure apportioning valve set (11) is located within the valve body and has a control member (15) the upward force (A) on which determines the cut-in pressure. Fluid pressure within the pressure chamber (5) is communicated to a control chamber (18) via a small orifice (21) in a steel cup (20) which closes the bottom of the valve body. Pressure within control chamber (18) is applied to a diaphragm (20) which permits pressure transfer to a pressure plate (16) abutting the control member (15) but prevents loss of fluid from the control chamber (18).