8. How to Replace the Components
！
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.
8-1. Diaphragm Assembly Replacement
Applicable
model
Work
category
Tool
Criteria
1
）
Loosen the knob completely before
disassembly.
ー
－
2
）
Remove the 4 screws and remove the
bonnet.
AR20S/ AR30S
/ AR40S
Phillips screwdriver
AR50S
Hexagon wrench
Nominal size: 5
－
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.
While the convex side of the bonnet is
facing the IN side, mount it onto the
body. Then tighten the 4 mounting
screws temporarily, before tightening
them diagonally and evenly to fix the
bonnet.
AR20S/ AR30S
/ AR40S
Phillips screwdriver
AR50S
Hexagon wrench
Nominal size: 5
Procedure
AR20S
AR30S
AR40S
AR50S
Disassembly
Assembly
I N
OU
T
Tightening torque:
AR20S
AR30S
AR40S
AR50S
2.35±0.3N
・
m
3.5 ±0.3N
・
m
Cross recessed
round head screws
(4 pcs.)
Bonnet
Washer
(only for 50 sizes)
(Protrusion on
IN side)
Pressure regulating
screw assembly
Pressure regulating spring
(4) Diaphragm assembly
Body
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