BENDIX TCH-001-034 User Manual

Technical Bulletin

Bulletin No.: PRO-01-34 Effective Date: 3/1/91 Cancels: N/A Page: 1 of 1

Subject: The BX-2150 Compressor Equipped With The Inlet Check

Valve And Air Dryers Installations

Field experience along with lab testing has revealed that the BX-2150, equipped with an
ICV, will pass significantly higher amounts of oil when an AD-2 or AD-4 air dryer is
installed. The higher oil passing rate can be attributed to the continued “pumping” of air
out the open air dryer purge valve while the compressor is unloaded. This occurrence is
caused by the ICV temporarily assuming the same function as the compressor’s inlet
valve during the unloaded cycle. The lack of head pressure resistance during the
unloaded/purge cycle contributes to the higher oil passing. This same condition does
not exist when the BX-2150 and AD-9 are combined since the AD-9’s integral “Turbo
Cutoff” Valve effectively closes the discharge line during the unload/purge cycle.
Closure of the AD-9 “Turbo Cutoff” valve prevents the escape of discharge line pressure
and assures that a positive pressure is maintained above the compressor piston thereby
preventing the ICV from functioning as the compressor inlet valve.

Reference and/or mark the following publications:
Product Bulletin PRO-08-14
Service Data Sheets:
SD-01-331 (BX-2150 Compressor)

SD-08-2 (AD-2 Air Dryer)
SD-8-4 (AD-4 Air Dryer)
SD-08-2412 (AD-9 Air Dryer)

Catalog pages:
01-L-1 to 01-L-16 BX-2150 Compressor

08-A-1 AD-2 Air Dryer
08-A-5 AD-4 Air Dryer
08-A-9 AD-9 Air Dryer
01-A-3 Inlet Check Valve

VOIDS PRO-01-33, DATED 3/1/91 ON SAME SUBJECT - - INCORRECT BULLETIN
NUMBER ASSIGNED…COPY OF CORRECT/CURENT PRO-01-33 ALSO
ATTACHED.