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7.3 Disassembling the Valve Section
Loosen the valve seat with a wrench and
remove it from the body. The coil spring is
exerting an upward pressure on the bottom
of the valve seat, so be careful that the
valve seat is not thrown out. After removing
the valve seat, remove the valve, the coil
spring and the screen.
7.4 Cleaning
After inspection and removal of any abnormality, clean and reassemble the parts.
The following parts will require cleaning before reassembly:
Threads of the
Adjustment Handle
Threads of the Cover
It is permissible to clean using water. However, cleaning with a mild detergent is recommended
for more effective cleaning.
7.5 Reassembling
Reassemble the unit using the same procedure as used for disassembling it; but in reverse order.
In addition, observe the following precautions:
1. PTFE gaskets may be re-used if free from fault, crushing or deformation.
2. Apply anti-seize to the steel ball and threaded portions of screws, bolts and the adjustment
handle. Apply a small amount of anti-seize agent to the threads of the valve seat carefully to
ensure it does not come into contact with other parts.
3. Fasten the bolts one at a time in a diagonal pattern alternately to provide uniform seating.
4. After assembly, make sure that the valve stem operates smoothly without binding. When the
valve is tightened, it may become off-centered under the valve seat. When this occurs, center
the valve under the valve seat.
Part
Cover Bolt
Valve Seat
If drawings or other special documentation were supplied for the product, any torque given
there takes precedence over values shown here.
* For A-DR20: The rubber is inlaid in the
main valve and cannot be removed.
The main valve itself must be replaced.
Bellows
Spacer (including slide bearing)
Valve Stem
Valve Seat Surface
Tightening Torques and Distance Across Flats
Tightening Torque N ・ m (lbf ・ ft)
25 (19)
120 (88)
Valve
Seat
Valve
Seat
Gasket
Main
Valve*
Distance Across Flats mm (in)
̶ 14 ̶
Coil Spring
Screen
Body
Main Valve
Valve Seat
Screen
/
13 (
)
1
2
/
27 ( 1
1
)
16
1 N ・ m 10 kg ・ cm
〜
〜
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