User manual BENDIX QRN-2 QUICK RELEASE VALVE

[. . . ] When air pressure beneath diaphragm is approximately 1 psi less than air pressure above the diaphragm, the outer edges of the diaphragm seal against the body's sealing lip. The exhaust remains sealed because air pressure bears against the center portion of the diaphragm from one side only. RELEASE OPERATION APPLY As shown in Figure 4, when air pressure enters the supply port, it causes the center portion of the diaphragm to seal the exhaust. Supply air pressure simultaneously forces the edges of the diaphragm away from the sealing lip in the body, allowing air to flow out the delivery ports. [. . . ] 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. SERVICE CHECKS 1. Visually inspect the valve's exterior for cracks, gouges, or other physical damage. Replace the valve if physical damage is excessive. Inspect all air lines connected to the valve for signs of wear or physical damage. Test air line fittings for excessive leakage and tighten or replace as necessary. OPERATIONAL AND LEAKAGE TESTS 1. Block the vehicle's wheels and fully charge the air system. Apply and release the service brakes several times and check for prompt response of the brakes at the appropriate wheels. With the air system fully charged, apply a soap solution to the QRN-2TM valve exhaust port. Leakage of a 1" bubble in 5 seconds is permissible. [. . . ] At a minimum, the QRN-2TM valve should be inspected every 12 months or 3600 operating hours, whichever comes first, for proper operation. Should the QRN-2TM valve not meet the elements of the operational tests noted in this document, further investigation and service of the valve may be required. INSTALLATION 1. Install the QRN-2TM valve on the vehicle using the mounting hardware saved during removal. Reconnect all air lines to the valve using the identification made during removal. [. . . ]