User manual BENDIX DOUBLE CHECK VALVES

[. . . ] In this type of installation the pressure differential to which the valve is subjected may under certain conditions be minimal. It is therefore suggested that performance of the double check valve will be optimized if it is mounted in the horizontal position. 1 SD-03-2202 SERVICE CHECKS Reservoir Brake Valve OPERATING AND LEAKAGE TEST A. When the double check valve is used in conjunction with a trailer control valve, the following operating and leakage test can be made: 1. Apply and release foot brake valve and note that the brakes apply and release on both tractor and trailer. [. . . ] Permissible leakage is a 1" bubble in 5 seconds (100 sccm). Repeat Step "b" applying air to other inlet port while checking opposite inlet port for leakage. If the double check valve does not function as described or if leakage is excessive, it is recommended that the valve be repaired or replaced with genuine Bendix parts. The following instructions should prove helpful: To Trailer Brakes Trailer Hand Control Valve Double Check Valve FIGURE 3 - DOUBLE CHECK VALVE: CONTROL OF SYSTEM FROM EITHER OF TWO CONTROL SOURCES PP-7TM Valve PP-1TM Valve Trailer Supply Spring Brake Control Double Check Valve Reservoir Reservoir FIGURE 4 - DOUBLE CHECK VALVE: SYSTEM WITH TWO SUPPLY SOURCES PREVENTIVE MAINTENANCE Important: Review the Bendix Warranty Policy before performing any intrusive maintenance procedures. A warranty may be voided if intrusive maintenance is performed during the warranty period. 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 DC-4TM valve should be inspected every 6 months or 1500 operating hours, whichever comes first, for proper operation. Should the DC-4TM valve not meet the elements of the operational tests noted in this document, further investigation and service of the valve may be required. 2 DISASSEMBLY 1. Remove the shuttle and/or shuttle guide, disc and/or disc guide (depending upon type of valve). CLEANING AND INSPECTION 1. Clean all metal parts in mineral spirits and dry them completely. Inspect all parts for excessive wear or deterioration. Inspect the bores of the valve housing for deep scuffing or gouges. Replace all parts that were discarded and any parts not found to be serviceable during inspection, using only genuine Bendix replacement parts. 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. 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-IS ® 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. [. . . ] Coat all static seals such as o-rings, grommets, etc. with BW 650M Silicone lubricant (BW 291126). It is not necessary to lubricate shuttles or discs. TESTING OF REBUILT DOUBLE CHECK VALVE Perform operating and leakage tests as described in "Service Checks" section. GENERAL SAFETY GUIDELINES WARNING! [. . . ]