User manual BENDIX RV-4 PRESSURE REDUCING VALVE

[. . . ] If pressure in the delivery lines exceeds the pressure setting of the valve, the force exerted by the air pressure will be greater than the spring force. The balance piston will move away from the exhaust valve, permitting air to flow past the exhaust valve, through the hollow piston stem and out the exhaust port. The inlet valve will remain closed. SD-03-3520 1 PREVENTIVE MAINTENANCE Important: Review the Bendix Warranty Policy before performing any intrusive maintenance procedures. A warranty may be voided if intrusive maintenance is performed during the warranty period. [. . . ] If the vehicle is equipped with an AD-ISTM air dryer system or a dryer reservoir module, be sure to drain the purge reservoir. Following the vehicle manufacturer's recommended procedures, deactivate the electrical system in a manner that safely removes all electrical power from the vehicle. Never exceed manufacturer's recommended pressures. Never connect or disconnect a hose or line containing pressure; it may whip. Never remove a component or plug unless you are certain all system pressure has been depleted. Use only genuine Bendix® replacement parts, components and kits. Replacement hardware, tubing, hose, fittings, etc. must be of equivalent size, type and strength as original equipment and be designed specifically for such applications and systems. Components with stripped threads or damaged parts should be replaced rather than repaired. Do not attempt repairs requiring machining or welding unless specifically stated and approved by the vehicle and component manufacturer. Prior to returning the vehicle to service, make certain all components and systems are restored to their proper operating condition. REMOVAL & INSTALLATION REMOVAL 1. Hold the vehicle on a level surface by means other than the air brakes. Remove all air pressure from all reservoirs. Identify, mark and then disconnect all air lines attached to the valve. Inspect and clean all air lines that connect to the valve. Clean the vehicle valve mounting area and mount the valve. Reconnect the air lines according to the identification marks made during removal. Remove exhaust cover screw (1), exhaust cover (2), and exhaust diaphragm (3). Remove four cap screws (4) with lockwashers (5) and cover (6). PLEASE READ AND FOLLOW THESE INSTRUCTIONS TO AVOID PERSONAL INJURY OR DEATH: When working on or around a vehicle, the following general precautions should be observed at all times. Park the vehicle on a level surface, apply the parking brakes, and always block the wheels. Stop the engine and remove ignition key when working under or around the vehicle. [. . . ] Install o-ring (24) on balance piston (23), place piston into body. Install inner (21) and outer (22) springs into base of balance piston and place shims (20) on top of springs. Replace cover (19) and attach with four cap screws (17) with lockwashers (18). Install spring seat (15) and spring (14) onto inlet/exhaust valve body (9). [. . . ]