User manual BENDIX QRV QR-1 QUICK RELEASE VALVES

[. . . ] QR-1TM valves also come with optional noise reducing foam crosses or silencers. Reference Figure 1, two styles of quick release valves are available and are functionally the same; the QRVTM valve, which is of older design and utilizes a spring and spring seat, and the QR-1TM valve, which in its standard configuration does not employ a spring or spring seat. (Note: QR-1TM valves with a pressure differential employ a spring and spring seat. ) Porting consists of one supply port, two delivery ports and one exhaust port. OPERATION When a brake application is made, air pressure enters the supply port; the diaphragm moves down, sealing the exhaust. At the same time, air pressure forces the edges of the diaphragm down and air flows out the delivery ports. [. . . ] 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. For vehicles with Antilock Traction Control (ATC), the ATC function must be disabled (ATC indicator lamp should be ON) prior to performing any vehicle maintenance where one or more wheels on a drive axle are lifted off the ground and moving. OPERATING AND LEAKAGE TESTS While holding a foot brake valve application: 1. Coat the exhaust port with a soap solution; leakage of a 1" bubble in 3 seconds is permitted. Coat the body and cover with a soap solution. No leakage is permitted between body and cover. If the valve does not function as described, or if leakage is excessive, it is recommended that it be replaced with a new or remanufactured unit, or repaired with genuine Bendix parts. GENERAL SAFETY GUIDELINES 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. 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. REMOVING AND INSTALLING REMOVING Block vehicle wheels and/or hold vehicle by means other than air brakes. Remove mounting bolts, then valve. 2 INSTALLING ASSEMBLY TM Mount the valve with exhaust port pointing down; securely QRV VALVE 1. [. . . ] If the valve is not equipped with spring and spring seat: QR-1TM VALVE a. Install the o-ring in the cover groove; install the cover 2. Remove the spring and spring seat (if so equipped). and tighten theh screws evenly and securely. [. . . ]