BENDIX TCH-001-040 User's Manual
Contents
1. Technical Bulletin Bulletin No TCH 001 040 Effective Date 10 25 2011 Cancels PRO 01 40 dated 12 1 94 Page 1 of 1 Subject SAFETY VALVE FOR INSTALLATION ON BENDIX COMPRESSORS The Bendix ST 4 safety valve is available for installation into the cylinder head of the Bendix Tu Flo 550 Tu Flo 750 BA 921 and BA 922 compressors to prevent excessive cylinder head pressure in the event the discharge line is blocked The excessive pressure typically results in compressor damage and may cause Subsequent engine damage These safety valves are installed in the unused compressor discharge port During normal operation the air pressure in the compressor exerts a force on the safety valve piston which is held against its seat by the safety valve spring When the operating pressure acting upon the safety valve piston exceeds the force of the safety valve spring the safety valve piston opens and vents the pressure to atmosphere The safety valve is preset to relieve pressures above 250 psi and comes in a variety of thread sizes as shown in the table below Because these safety valves are designed specifically for this application a standard safety valve must not be used in lieu of the valves shown here Install In Unused Compressor Discharge Port ST 4 Safety Valve Typical Compressor Cylinder Head Bendix Number of ST 4 Safety Valve Exhaust Pressure Piece No Thread Size Holes Setting 131081 1 4 18 9 16 in2. cludes washer 250 psi eee 2011 Bendix Commercial Vehicle Systems LLC a member of the Knorr Bremse Group 10 2011 All Rights Reserved
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