23
Model EA91A＆EA90A
MAINTENANCE
7
CAUTION
※For filtered pressure reducing valve, periodically perform blowing of drain (Guide : approx. 6
months) and cleaning of filter (Guide：approx. 1 year)
【Note】
Plasti-lube : Produced by SULFLO INC
Check Item
Remarks
Periodic Check Frequency (Yr.)
1.0
2.0
Check for presence or absence of
damage and for accuracy
Refer to Item 7.2.1
Refer to Item 7.2.1
Check for wear and tear, Refer to Item 7.2.2
Check for wear and tear, Refer to Item 7.2.2
Check for presence or absence of damage
Check for presence or absence of damage
Check for presence or absence of
wear and tear
Check for presence or absence of
wear and tear
Check for presence or absence of
wear and tear
Use Plasti-lube #00 when reassembling
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Pressure Gauge
Restriction (Fixed Restriction)
Filter
Diaphragm
Gasket Packing
Nozzle, Flapper
Supply Air Valve,
Seat for Main Body
Feedback Lever
(Sliding Part of Connector Pin)
Connector Pin (Transmission Pin)
Set Spring (Linear Type)
Each Bearing (Linear, Cam Types)
7.1 Periodic Maintenance
Periodic Check List
Periodic maintenance and check are important in preventing occurrence of non-conformance and
extending service life of the positioner. A definite maintenance program should be established and
followed using the Periodic Check List shown below as a guide.
Be sure to move the Valve Positioner to non-hazardous area
for repairing or maintaining incident to part replacement.
※Before inspection of each part, check for damage of appearance, abnormal rust, air
leakage, etc.
Pneumati
c
Pressure
Pilot
Sliding
