10. How to Replace the Products
！
Warning
Before replacement, make sure that no pressure remains in the epuipment.
Also, make sure to loosen the knob of the regulator so that the set pressure is zero.
After replacement, confirm that the product satisfies specific functions and no external leakage occurs before operating it.
10-1. Diaphragm Assembly Replacement
Applicable
model
Work
category
Tool
Criteria
1) Loosen the knob completely before
disassembly.
-
－
2) Remove the 4 screws and remove the bonnet.
Phillips
screwdriver
－
3) Remove the pressure regulating screw
assembly, pressure regulating spring, and
diaphragm assembly in that order.
－
－
4) Assemble the diaphragm assembly, pressure
regulating spring, and then pressure regulating
screw assembly.
－
Direction of diaphragm assembly
and pressure regulating screw
assembly
5
）
Assemble the bonnet to the body.
Mount the bonnet to the body with the protuded
side facing upwards an inline with ports. Tighten
four mounting screws temporarily, then
tightening them diagonally and evenly to fix the
bonnet.
Phillips
screwdriver
-15-
Step
AR20M
AR30M
AR40M
Disassembly
Assembly
Body
Diaphragm assembly (Cross section)
Tightening torque
AR20M
AR30M
AR40M
3.5 ±0.3N
・
m
2.35+/-0.3 N m
(Protruded part
)
Mounting direction of the protuded
part of the bonnet
Mount the bonnet and body so that the protuded
part and ports are placed as in the drawing above.
OUT
Common
Common
Screws (4 pcs.)
Knob
Bonnet
Adjust screw assembly
Adjust spring
(8)
Diaphragm assembly
(Seating part of relief valve)
