User manual BENDIX E-10 DUAL BRAKE VALVES

[. . . ] As the exhaust valve closes, the primary inlet valve is moved off its seat allowing primary air to flow out the primary delivery port. SD-03-817 1 16 25 15 28 18 19 17 26 34 7 8 1 2 27 22 23 16 18 4 17 33 31 24 19 21 20 5 32 6 30 14 13 12 9 11 10 FIGURE 4 - E-10TM DUAL BRAKE VALVE SECTIONAL DIAGRAM FIGURE 3 - E-6TM DUAL BRAKE VALVE SECTIONAL DIAGRAM APPLYING: NORMAL OPERATION SECONDARY CIRCUIT When the primary inlet valve is moved off its seat, air is permitted to pass through the bleed passage and enters the relay piston cavity. The air pressure moves the relay piston, which contains the exhaust seat and closes the secondary exhaust valve. As the secondary exhaust valve closes, the secondary inlet valve is moved off its seat allowing the secondary air to flow out the secondary delivery port. Because of the small volume of air required to move the relay piston, action of the secondary circuit of the valve is almost simultaneous with the primary circuit portion. delivery ports, the primary piston will mechanically move the relay piston, allowing the piston to close the secondary exhaust valve and open the secondary inlet valve and allow air to flow out the secondary delivery port. BALANCED: PRIMARY CIRCUIT When the primary delivery pressure acting on the piston equals the mechanical force of the brake pedal application, the primary piston will move and the primary inlet valve will close, stopping further flow of air from the primary supply line through the valve. [. . . ] Remove the four hex head cap screws securing the lower body to the upper body and separate the body halves. Remove the rubber seal ring (14) from the lower body. While applying thumb pressure to the primary piston, lift out and up on the three lock tabs of the primary piston retainer (15). While depressing spring seat (7), remove retaining ring (8). Remove spring seat and coil spring (5). 9. Using a 3/8" wrench, hold the lock nut (16) on the threaded end of the stem (17) in the primary piston (2). Insert a screwdriver in the exhaust passage through the center of the valve and engage the slotted head of the stem. Remove lock nut (16), spring seat (18), stem spring (19), primary piston (2), and primary piston return spring (6). Caution: Before proceeding with the disassembly, refer to Figure 4 and note that the lock nut and stem are used to contain the primary piston return spring, stem spring and the relay piston spring. The combined force of these springs is approximately 50 pounds and care must be taken when removing the lock nut as the spring forces will be released. It is recommended that the primary piston and relay piston be manually or mechanically contained while the nut and stem are being removed. Using a screwdriver to restrain the stem, as in step nine, remove the lock nut (16), spring seat (18) and stem spring (19). Remove the relay piston (20), relay piston spring (21), primary piston and primary piston return spring (23) from the upper body. Note: Certain E-6TM valves do not have a relay piston spring (21). If none is found, none should be replaced. On valves manufactured after October 7, 1976, a small washer (24) will be found in the cavity in the lower side of the primary piston (22). Disassemble the primary piston by rotating the spring seat nut (25) counterclockwise. Separate the spring seat LEAKAGE CHECK 1. Make and hold a high pressure (80 psi) application. Coat the exhaust port and body of the brake valve with a soap solution. Leakage permitted is a 1" bubble in 3 seconds. If the brake valve does not function as described above or leakage is excessive, it is recommended that it be replaced with a new or remanufactured unit, or repaired with genuine Bendix parts available at authorized Bendix parts outlets. REMOVAL 1. [. . . ] 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. [. . . ]