Bendix Commercial Vehicle Systems PRESSURE PROTECTION VALVES - Manual (Page 3)

3
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 pressure 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.