User manual BENDIX QR-N QUICK RELEASE VALVE

[. . . ] Simultaneously, the outer edge of the diaphragm moves away from the sealing lip of the upper body allowing air to flow from the supply port out the delivery ports. BALANCE When air pressure on both sides of the diaphragm is approximately equal (1 psi differential), the natural resiliency of the diaphragm material causes the outer edge of the diaphragm to move into contact with the upper body sealing lip. The QR-NTM valve exhaust remains sealed because air pressure bears against the center portion of the diaphragm from one side only. 1 SD-03-905 RELEASE When air pressure is reduced or removed from the QR-NTM valve supply port, the air pressure on the delivery side of the diaphragm is greater than that on the supply side. The higher delivery side pressure holds the outer edge of the diaphragm against the upper body sealing lip while simultaneously moving the center portion away from the exhaust port. Air from the delivery ports flows out the exhaust. [. . . ] 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 QR-NTM valve should be inspected every 12 months or 3600 operating hours, whichever comes first, for proper operation. Should the QR-NTM valve not meet the elements of the operational tests noted in this document, further investigation and service of the valve may be required. 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. 2 4. If the QR-NTM 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 using a genuine Bendix maintenance kit. Use only genuine Bendix replacement parts and components. Only components, devices, mounting and attaching hardware specifically designed should be used. Replacement hardware, tubing, hose, fittings, etc. should be of equivalent size, type, length, and strength as the original equipment. Make certain that when replacing tubing or hose, all supports, clamps or suspending devices that were originally installed by the vehicle manufacturer are reinstalled. Devices with stripped threads or damaged parts should be replaced. Repairs requiring machining should not be attempted. CLEANING & INSPECTION 1. Clean the upper and lower body halves; also diaphragm follower and spring (if applicable) in mineral spirits. Do not immerse nonmetallic components for a prolonged period of time (no more than 10 minutes). It is recommended that the diaphragm and sealing ring be replaced after disassembly. [. . . ] If so, a light spring load should be anticipated and can be easily controlled by manually holding the body halves together. Separate the body halves and remove the diaphragm (and diaphragm follower and spring if so equipped). Remove the sealing ring between the body halves. INSTALLING THE QR-NTM VALVE 1. Install the tubing or hose fittings in the upper body of the QR-NTM valve. [. . . ]