Bendix Tch 001 040 Users Manual 040b

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Technical Bulletin
Bulletin No: TCH-001-040
Subject:

Effective Date: 10/25/2011

Cancels: PRO-01-40 dated 12/1/94

Page: 1 of 1

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.

Hex

Install In Unused
Compressor Discharge Port

Thread
Size
Hole
ST-4™ Safety
Valve
Typical Compressor
Cylinder Head

Bendix®
ST-4™ Safety Valve
Piece No.

Number of
Exhaust Pressure
Thread Size Hex Size
Holes
Setting

131081
(includes washer)

1/4-18

9/16”

2

800154

1/2-14

7/8”

2

800533

3/4-16

7/8”

2

800534

M16

7/8”

2

801116

7/8-14

15/16”

2

250 psi

© 2011 Bendix Commercial Vehicle Systems LLC, a member of the Knorr-Bremse Group • 10/2011 • All Rights Reserved.
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