10. 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.
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.
AR20/ AR30/ AR40
Phillips screwdriver
AR50/ AR60
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.
AR20/ AR30/ AR40
Phillips screwdriver
AR50/ AR60
Hexagon wrench
Nominal size: 5
-16-
Procedure
AR20
AR30
AR40
AR50
AR60
Disassembly
Assembly
I N
I N
OU
T
Bonnet
Pressure regulating screw
assembly
Pressure regulating spring
(8)
Diaphragm assembly
Body
Screws (4 pcs.)
Diaphragm assembly (Cross section)
(Seating part of relief valve)
Knob
Tightening torque
AR20
AR30
AR40
AR50
AR60
2.35+/-0.3 N m
3.5 +/-0.3 N m
