Diaphragm Assembly Replacement - SMC Networks AR20MK Series Operation Manual

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

Work
Applicable
model category
AR20M Disassembly
AR30M
AR40M
Assembly
Screws (4 pcs.)
Knob
Bonnet
Adjust screw assembly
Adjust spring
Step
1) Loosen the knob completely before
disassembly.
2) Remove the 4 screws and remove the bonnet.
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.
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.
Diaphragm assembly (Cross section)
(Seating part of relief valve)
Tool
-
Phillips
screwdriver
－
－
Phillips
screwdriver
(8)
Diaphragm assembly
Mounting direction of the protuded
part of the bonnet
Common
Body
Mount the bonnet and body so that the protuded
part and ports are placed as in the drawing above.
-15-
Criteria
－
－
－
Direction of diaphragm assembly
and pressure regulating screw
assembly
Tightening torque
AR20M
2.35+/-0.3 N m
AR30M
3.5 ±0.3N・m
AR40M
OUT
(Protruded part)
Common