User manual BENDIX R-6 RELAY VALVE

[. . . ] At the same time, the outer or inlet portion of the inlet/exhaust valve moves off its seat, permitting supply air to flow from the reservoir, past the open inlet valve and into the chambers. BALANCED The air pressure being delivered by the open inlet valve also is effective on the bottom area of the relay piston. When air pressure beneath the piston equals the service air pressure above, the piston lifts slightly and the inlet spring returns the inlet valve to its seat. The exhaust remains closed as the service line pressure balances the delivery pressure. [. . . ] Install valve and tighten mounting bolts. Connect air lines to valve (Plug any unused ports). Test valve as outlined in "Operating and Leakage Tests. " DISASSEMBLY NOTE: Prior to disassembly, mark location of cover to body to facilitate assembly. Remove cover (2) with relay piston (4) and spring (6) (if so equipped). Remove piston o-ring (3) from piston (4) and cover seal o-ring from body. Remove exhaust cover cap screws, (19) exhaust cover, and remove inlet/exhaust valve insert (8) from body(7). Remove exhaust seat (5) from relay piston (4) and exhaust check valve(18). (Remove only if new parts are to be installed). INLET/EXHAUST VALVE INSERT DISASSEMBLY NOTE: If complete inlet/exhaust valve is replaced, disregard steps 6 to 9. Depress and hold valve guide down against valve spring tension and remove retainer (16). Remove valve insert seal o-ring (13), valve guide (14), spring (12), and valve retainer (11). Remove the inlet/exhaust valve (9) from its body (10). Remove inner o-ring (15) from valve guide (14). 1. Prior to assembly, lightly lubricate the relay piston guide post, o-rings, cover bore and inlet body with Dow Corning Silicone 55-M Pneumatic grease (Bendix Pc. INLET/EXHAUST VALVE ASSEMBLY NOTE: If new inlet/exhaust valve assembly insert is used, disregard Steps 2 to 6. Install inlet/exhaust valve (9) over valve body (10), smooth surface up. Position valve retainer (11) over inlet valve body (10) and valve. Install inlet valve spring (12) over inlet body (10) and install o-ring (15) in the inner groove in the valve guide (14). Depress and hold guide down against inlet spring and install retainer ring (16) (A 9/16" twelve point socket can be used to push the retainer ring down until it snaps in the groove in the inlet valve body). Install insert (8) in valve body (7), install exhaust cover (17) and secure with 10-24 screws (19) torque to approximately 20-30 inch pounds. Install exhaust check diaphragm (18) into exhaust cover (17). Install relay piston o-ring (3) on relay piston (4), then position relay piston in cover. [. . . ] 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. [. . . ]