User manual BENDIX RV-4 PRESSURE REDUCING VALVE

[. . . ] A single pipe plug is installed in the control port and should remain in place. OPERATION The spring force exerted on the balance piston determines the delivery pressure of the valve. With no air pressure present at the supply port, the inlet valve is unseated and open while the exhaust passage through the center of the control piston is sealed by the exhaust valve. Compressed air entering the supply port flows past the open inlet valve, around the balance piston and out the two delivery ports. When air pressure on the balance piston overcomes spring force, the piston moves and the valve spring forces the inlet valve on its seat, closing off the supply of air. [. . . ] Leakage should not exceed a 1" diameter bubble in 3 seconds (175 SCCM). If leakage is excessive, the valve should be repaired or replaced and the operating and leakage tests performed at the time of repair or replacement. This concludes the operation and leakage tests and the test gauges should be removed. 8. 9. 10. thoroughly understand the recommended procedures. Use only the proper tools and observe all precautions pertaining to use of those tools. If the work is being performed on the vehicle's air brake system, or any auxiliary pressurized air systems, make certain to drain the air pressure from all reservoirs before beginning ANY work on the vehicle. 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 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. 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. Identify, mark and then disconnect all air lines attached to 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). 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. [. . . ] 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). Install o-rings (12 & 13) onto o-ring retainer (11) and place on top of spring (14), compress and install retaining ring (10). Install inlet/exhaust assembly (9) into valve body and install retaining ring (8). [. . . ]