User manual BENDIX RV-1 PRESSURE REDUCING VALVE

[. . . ] As the pressure in the delivery line drops, the force of the spring above the piston becomes greater than the air pressure below the piston, allowing the piston to move downward, moving the inlet valve off its seat and allowing air to pass out the delivery port. If pressure in the delivery line exceeds the pressure setting of the pressure reducing valve, the force exerted by the air pressure below the piston will be greater than the spring force above the piston. The piston will move up from the exhaust valve, permitting air to pass by the exhaust valve, OPERATING AND LEAKAGE TESTS Connect a 120 psi pressure source to the supply port and connect an accurate test gauge to the delivery. Observe the gauge with the supply pressure applied, this is the delivery pressure (the inlet valve is closed). [. . . ] A warranty may be voided if intrusive maintenance is performed during the warranty period. No two vehicles operate under identical conditions, as a result, maintenance intervals may vary. Experience is a valuable guide in determining the best maintenance interval for air brake system components. At a minimum, the RV-1TM valve should be inspected every 6 months or 1500 operating hours, whichever comes first, for proper operation. Should the RV-1TM valve not meet the elements of the operational tests noted in this document, further investigation and service of the valve may be required. TM WARNING!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. When working in the engine compartment, the engine should be shut off and the ignition key should be removed. Where circumstances require that the engine be in operation, EXTREME CAUTION should be used to prevent personal injury resulting from contact with moving, rotating, leaking, heated or electrically charged components. 3. Do not attempt to install, remove, disassemble or assemble a component until you have read and 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-IS® 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. [. . . ] Insert the piston into valve body and place the spring inside the piston. Carefully insert the inlet/exhaust valve guide into small opening in piston. Using needle-nose pliers, grab end of inlet/exhaust valve spring and twist the end into the groove of valve body. Assure proper centering of inlet/exhaust valve and spring. [. . . ]