BENDIX BW1440 User's Manual
Contents
1. See INLET f err AN PISTON VALVE SNY Ny m CHECK SSeS P VALVE aa sS N N Joar RRS PR 3 OR PR 4 Sc PRESSURE PROTECTION ae j DELIVERY VALVES PORT SSS YOO BENDIX PR 4 PRESSURE PROTECTION VALVE PRESSURE REGULATING SPRING PISTON PLUG EXHAUST VENT St Be PISTON PLUG PISTON a a ne O RING 7 g VALVE STEM SUPPLY PISTON ji PORT SPRING A m dpa INLET VALVE SPRING DELIVERY PORT BENDIX PR 2 PRESSURE PROTECTION VALVE a a 5 RETAINER em 1 INLET VALVE PR 2 PRESSURE PROTECTION VALVE Hil DESCRIPTION The pressure protection valve is a normally closed be used to delay filling of auxiliary reservoirs to ensure a quick build up of brake system pressure pressure control valve which can be referred to as a non exhausting sequence valve These valves are used in many different applications An example would be in an air brake system to protect one reservoir or reservoir system from another by closing automatically at a preset pressure should a reservoir system failure occur The valves can also The Bendix PR 2 and PR 4 pressure protection valves have one 1 4 N P T F supply port and one 1 4 N P T F delivery port which are identified Both valves are provided with two 9 32 mounting holes through the body The closing pressure of the PR 2 valve is externally adjustable while the PR 4 valve has a fixed setting2. OPERATION Air entering the supply port is blocked from flowing out the delivery port by the inlet valve which is normally held closed by the pressure regulating spring above the piston When sufficient air pressure builds beneath the piston the piston will move opening the inlet valve and allowing air to flow out the delivery port As long as air pressure at the supply port remains above the specified closing pressure the inlet valve will remain open NOTE The Bendix PR 2 and PR 4 valves closing pressure is noted on the label affixed to the valve Opening pressures of the valves are higher than closing pressures The pressure ranges are noted below Bendix PR 2 valve Opening pressure 15 20 psi higher than closing pressure Bendix PR 3 amp PR 4 valves Opening pressure approximately 10 psi higher than closing pressure Bendix PR 3 valve Check valve will retain maximum pressure in downstream reservoir If system air pressure decreases below the specified closing pressure the regulating spring will close the inlet valve The remaining air pressure at either the supply or delivery side depending on where the pressure drop occurs will be retained 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 id
3. cedures deactivate the electrical system in a manner that safely removes all electrical power from the vehicle BW1440 2011 Bendix Commercial Vehicle Systems LLC a member of the Knorr Bremse Group 5 2011 All rights reserved
4. entical 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 PR valves should be inspected every 6 months or 1500 operating hours whichever comes first for proper operation Should the PR valves not meet the elements of the operational tests noted in this document further investigation and service of the valve may be required OPERATING AND LEAKAGE CHECKS OPERATING CHECKS 1 Provide a pressure gauge and drain valve at the supply side and delivery side of the pressure protection valve being checked 2 Charge the air system to full pressure and shut off the engine 3 Observing the gauges on the supply and delivery sides of the valve slowly exhaust pressure from the delivery side Note that both gauges will show pressure loss until the closing pressure of the pressure protection valve is reached The pressure protection valve should close at approximately 5 psi the pressure indicated on the valve s label or in the vehicle handbook The gauge on the delivery side of the valve should continue to show loss of pressure while the gauge on the supply side should stop at the same pressure as the setting of the valve 4 PR 3 valve only Build pressure up again and shut off engine Slowly exhaust air from the supply side of the PR 3 valve The gauge on the delivery side of the valve should remai
5. lent size type and strength as original injury resulting from contact with moving equipment and be designed specifically for rotating leaking heated or electrically charged such applications and systems components 9 Components with stripped threads or damaged 3 Donot attempt to install remove disassemble parts should be replaced rather than repaired or assemble a component until you have read Do not attempt repairs requiring machining or and thoroughly understand the recommended welding unless specifically stated and approved procedures Use only the proper tools and by the vehicle and component manufacturer observe all precautions pertaining to use of 10 Prior to returning the vehicle to service make those tools certain all components and systems are 4 If the work is being performed on the vehicle s restored to their proper operating condition air brake system or any auxiliary pressurized 11 For vehicles with Automatic Traction Control air systems make certain to drain the air ATC the ATC function must be disabled pressure from all reservoirs before beginning ATC indicator lamp should be ON prior to ANY work on the vehicle If the vehicle is performing any vehicle maintenance where one equipped with a Bendix AD IS air dryer system or more wheels on a drive axle are lifted off the or a dryer reservoir module be sure to drain the ground and moving purge reservoir 5 Following the vehicle manufacturer s recommended pro
6. n at the highest pressure previously attained LEAKAGE CHECKS 1 Charge the air system to full pressure and shut off the engine 2 Apply a soap solution around the cap of the pressure protection valve A 1 bubble in 3 seconds or longer is acceptable PR 3 valve No leakage is permissible at the bottom of the valve 3 Drain the air pressure from the delivery side of the pressure protection valve and disconnect the air line to it 4 Apply a soap solution to the delivery port A 1 bubble in 5 seconds or more is acceptable GENERAL If the pressure protection valve does not function as described 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 Bendix outlets REMOVING AND INSTALLING REMOVING 1 Block or hold the vehicle by means other than air brakes 2 Drain all system reservoirs to O psi 3 Disconnect and identify Supply and delivery the air lines leading to and from the pressure protection valve 4 Remove the mounting bolts if any that secure the valve INSTALLING 1 Re install the mounting bolts and secure the replacement valve to the vehicle 2 Reconnect the supply delivery air lines to the proper ports of the replacement valve GENERAL After installing a replacement valve it is recommended that the operating and leakage checks be performed as outlined in this manual If the closing pressu
7. re does not conform to that shown on the valve label or in the vehicle or a different setting is desired the PR 2 valve may be adjusted by loosening the locknut and tightening or loosening the adjusting cap as required however if the proper setting cannot be attained by moderate adjustment of the cap the valve may have the wrong spring and will have to be exchanged for the correct valve The PR 3 and PR 4 valves are not adjustable GENERAL SAFETY GUIDELINES WARNING PLEASE READ AND FOLLOW THESE INSTRUCTIONS TO AVOID PERSONAL INJURY OR DEATH When working on or around a vehicle the following general precautions should be observed at all times 1 Park the vehicle on a level surface apply the 6 Never exceed manufacturer s recommended parking brakes and always block the wheels pressures Always wear safety glasses 7 Never connect or disconnect a hose or line 2 Stop the engine and remove ignition key when containing pressure it may whip Never remove working under or around the vehicle When a component or plug unless you are certain all working in the engine compartment the engine system pressure has been depleted should be shut off and the ignition key should 8 Use only genuine Bendix brand replacement be removed Where circumstances require parts components and kits Replacement that the engine be in operation EXTREME hardware tubing hose fittings etc must be CAUTION should be used to prevent personal of equiva
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