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4. Maintenance and Repair
REGULAR INSPECTION
Repair and inspect as described below. If any malfunction occurs, take appropriate measures according to
the preventive maintenance procedures and troubleshooting in Chapter 6. Also, disassemble and inspect the
system during the regular overhaul period, and replace parts if necessary.
♣ RECOMMENDATIONS
The life span of the valve can increase if you replace parts according to their replacement cycles. Refer to
the Part Replacement Cycle sheet shown below.
Item Name
Piston O-ring
Piston Wearing
IRREGULAR INSPECTIONS
A) Are there abnormal noise, vibration or hunting?
B) Does air pressure escape from actuator?
C) Are there any loose bolts and nuts?
4.1 Valve Disassembly
To prevent human injuries and damages to control system, remove instrument air and
signals from the valve, close the block valve and open the bypass valve to switch over
the pressure from the line to the bypass. Then slowly unfasten the bolts from the pipe
until the internal pressure of the body is completely released and remove the valve
before disassembling the actuator.
Part Replacement Cycle Sheet
Replacement Cycle
3 years
5 years
- WARNING -
- 6 -
Others
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