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& 2 "
replace valve
2. Piston seat washer
takes a deep set
Replace seat washer
Caution:
Do
not apply voltage to solenoid coil that has been removed from valve.
l-1/2" ,
l-l/#" ,
l" ,
314"
replace piston
l/2" , &
3/8" ,
6" gap in
split piston rings.
Install new bonnet
Trim as required
Failure to close when
solenoid de-energized
1. Piston Ring binding
between body bore
and piston
Remove piston and place
ring in groove, then insert
piston in body
Remove piston and clean
out matter
2. Foreign matter lodged
on body seat
3. Foreign matter
preventing plunger
from seating
Clean out foreign matter
at plunger seat hole
4.
Plunger tip is broken
or badly worn
Replace plunger
assembly
Leakage
1. Plunger seat hole
eroded
/I
Chapter 4 Troubleshooting Guide
Problem
Possible Cause
Corrective Action
Failure to open when
solenoid engergized
1. Low voltage at solenoid
(below 85% of rated
voltage)
Insure proper voltage at
solenoid
2. Solenoid failure
Check for excessive
voltage at solenoid
Replace split rings
3. Worn rings
Pressure drop less
than 5 PSI
Increase pressure
differential to 5 PSI
4.
5. Bonnet bent
6. Should have approx-
imately 1
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