How To Replace The Components; Diaphragm Assembly Replacement - SMC Networks AW20 Series Operational Manual

11. How to Replace the Components

！ Warning
Before replacement, make sure that no pressure remains in the equipment.
Also, make sure to loosen the knob of the filter 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.

11-1. Diaphragm Assembly Replacement

Work
Applicable
model category
AW20 Disassembly
AW30
AW40
AW60
Assembly
Screws (4 pcs.)
Knob
Bonnet
Pressure regulating screw
assembly
Pressure regulating spring
Procedure
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.
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.
Tool
-
AW20/ AW30/
AW40
Phillips screwdriver
AW60
Hexagon wrench
Nominal size: 5
-
-
AW20/ AW30/
AW40
Phillips screwdriver
AW60
Hexagon wrench
Nominal size: 5
Diaphragm assembly (Cross section)
(Seating part of relief valve)
(12) Diaphragm assembly
Body
-28-
Criteria
-
-
-
Direction of diaphragm
assembly and pressure
regulating screw assembly
Tightening torque:
AW20-D
2.35+/- 0.3 N m
AW30-D
AW40-D
3.5+/- 0.3 N m
AW60-D