172-65634MAJ-03 (A-DR20) 6 Oct 2021
11
Disassembly
When disassembling or removing the product, wait until the internal
pressure equals atmospheric pressure and the surface of the product
has cooled to room temperature. Disassembling or removing the
product when it is hot or under pressure may lead to discharge of fluids,
causing burns, other injuries or damage.
CAUTION
It is a recommended practice to dismantle and inspect the A-DR20 once a year for
preventive maintenance purposes. It is especially important to perform an inspection
immediately after the initial run of a new line or before or after equipment is taken out
of service for a long period of time.
(Installation, inspection, maintenance, repairs, disassembly, adjustment and valve
opening/closing should be carried out only by trained maintenance personnel.)
Remove all pressurized air from the piping (both upstream and downstream).
Remove the A-DR20 from the piping, and secure it in a vise to perform disassembly
and inspection.
Disassembling the Adjusting Section
Loosen the adjustment handle completely and remove the cover bolts. After
removing the cover, you will see the steel ball, the spring retainer and the coil spring.
Check for seizure or any damaged screw threads.
Retaining Ring
Steel Ball
Spring Guide
Coil Spring
Adjustable Handle
Locknut
Cover Bolt
Cover