172-65634MAJ-03 (A-DR20) 6 Oct 2021
10
Adjustment
To avoid problems such as water hammer and to protect air-using equipment, the
A-DR20 should be properly adjusted.
1. It is necessary to blow down all pipe lines thoroughly.
The blowdown is especially important if the line is new or has been shut down for a
long period of time. Take particular care to ensure that matter such as condensate
and dirt does not remain inside the air-using equipment.
(Stay clear of any pressurized blow-out from the safety valve.)
2. Make sure that the shut-off and bypass valves
located upstream and downstream of the
A-DR20 are completely closed.
3. Loosen the locknut, then turn the adjustment
handle counter-clockwise to free the coil spring.
4. Slowly, fully open the shut-off valve at the inlet of
the A-DR20.
5. Slightly open the shut-off valve at the outlet of the A-DR20.
6. Turn the adjustment handle clockwise until the
desired outlet pressure is obtained. Wait
several minutes.
7. Slowly, fully open the shut-off valve at the
outlet of the A-DR20.
8. After setting, retighten the locknut.
9. When shutting down the system, always
close the outlet shut-off valve first and then
the inlet valve.
Maintenance
Take measures to prevent people from coming into direct contact with
product outlets. Failure to do so may result in burns or other injury from
the discharge of fluids.
CAUTION
Be sure to use only the recommended components when repairing the
product, and NEVER attempt to modify the product in any way. Failure to
observe these precautions may result in damage to the product or burns
or other injury due to malfunction or the discharge of fluids.
CAUTION
Operational Check
To ensure a long service life for the A-DR20, the following inspection and
maintenance should be performed regularly.
Part
Inspection and Maintenance Frequency
Screen
Disassemble and clean annually. If there is substantial blockage,
install a strainer (approximately 60 mesh) ahead of the A-DR20.
Main Valve, Valve Seat If there is chattering or dirt, premature wear may result.
Valve Stem,
Spacer (Slide Bearing)
If hunting or chattering takes place, premature wear may result.
Bellows
If hunting or chattering takes place, cracks or fatigue may develop
in a short period of time.
Loosen the
Locknut
Fully Raise the
Adjustment Handle
Increase
Pressure
Clockwise
Counter-clockwise
Decrease
Pressure
