User manual BENDIX TW-1-3-4-5-6 CONTROL VALVES

[. . . ] DELIVERY PORTS (2) 1/4" NPT SUPPLY SUPPLY CAP NUT FIGURE 2 - TW-3TM CONTROL VALVE DESCRIPTION The TW series valves are manually operated, non-graduating, on-off valves. They are extensively used in air systems to control nonmodulating air controlled devices. The TW-1TM valve (Figure 1) is normally panel mounted and can be provided with a steel, zinc or nylon manually operated lever. [. . . ] 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 exceed manufacturer's recommended pressures. OPERATION With air pressure at the supply port (Figure 1) and the plunger in the upward position, the valve is in the exhaust position. The delivery ports are open to atmosphere through the exhaust passage in the center of the plunger. When the plunger is depressed by the cam action of the lever (Figure 1) or by a direct force on a push button (Figure 3) the plunger contacts the inlet valve, closing the exhaust passage and pushes the inlet valve off the inlet seat in the body, allowing supply air to flow through the delivery ports to the controlled device. SERVICE CHECKS OPERATING AND LEAKAGE TESTS Connect a 100 psi air pressure source to the supply port and connect delivery to an air gauge (if there are two delivery ports, plug one). With the valve in the released position, check for leakage at the exhaust holes with a soap solution. Leakage should not exceed 100 SCCM or a 1" bubble formed in 5 seconds. If the TW valve does not function as described or if excessive leakage occurs, it is recommended that it be replaced with a new unit or repaired with genuine Bendix parts. 2 7. 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. [. . . ] Inspect all springs for cracks, distortion or corrosion and replace if necessary. ASSEMBLY Prior to assembly lubricate the body bore, plunger, plunger dome, o-rings, lever cam, lever pin, and cap nut threads with Bendix barium base grease part number 246671. TW-1TM, TW-3TM & TW-6TM CONTROL VALVES Depress the plunger, place lever cam in slot in body, line up holes in body with hole in lever and insert the pin. [. . . ]