Groth 1401E User Manual
Page 9
8
TROUBLESHOOTING GUIDE
PROBLEM
INSPECTION
SUGGESTED CORRECTIVE ACTION
Vapor flowing at tank
pressure below specified
set point.
Visual, audible or
vapor detector
Check actual set pressure on tank if field test connection is
installed. Otherwise remove unit and test for: Incorrect
pressure and blowdown setting using setting and testing
procedure in this manual. Damaged seals, seat or
diaphragms. Damaged spring or other components.
Foreign material or corrosion in pilot.
Vapor not flowing at
tank pressure above
specified set point.
Visual, audible or
vapor detector
Check actual set pressure on tank if field test connection is
installed. Otherwise remove unit and test for: Incorrect
pressure and blowdown setting using setting and testing
procedure in this manual. Plugged sense line or internal
orifices. Foreign material or corrosion in pilot.
Vapor leaking from
spring bonnet vent
Visual, audible or
vapor detector
Ruptured diaphragms; remove and replace.
Vapor leaking from body
vent
Visual, audible or
vapor detector
Damaged seal, seat or body diaphragm, or stem O-Ring.
Remove and replace.
Incorrect blowdown
pressure
Visual, audible or
vapor detector
Remove and set according to setting and testing procedure
in this manual.
RECOMMENDED SPARE PARTS
When ordering spare parts, include model and serial
number of the valve, pressure setting, blowdown
setting and required material for soft goods.
TABLE 3
RECOMMENDED SPARE PARTS
Item Description
Qty
15 Diaphragm,
actuator
2
40 Diaphragm,
body
1
19 O-Ring,
blowdown
1
28 O-Ring,
stem
1
27 O-Ring,
seat
1
32 O-Ring,
disc
1
35
Gasket, spring bonnet
1
41 Gasket,
body
1
10 Gasket,
actuator
2
25 Washer,
spacer
3
22 Stem
1
26 Screw,
stem
1
34 Bushing,
seat
1
33 Disc
1
20 Needle,
blowdown
1
30 Spacer,
central
1
17 Screen,
filter
1
MAINTENANCE
The 1401E pilot does not require routine lubrication
or adjustments. It should be checked periodically, at
least once a year, to confirm the valve is functioning
properly and that the set point is correct. The pilot
valve is a fail safe device because failure of any seals
or diaphragms will cause pressure to be vented to
atmosphere, thereby allowing the pressure relief
valve to open under pressure.
Groth Corporation strongly recommends that all
service performed on a pilot operated valve be done
at the factory or a factory authorized repair center.
Trained mechanics with specialized test equipment
will ensure that the valve is accurately set. Flow
capacity can be measure at the specified over-
pressure condition, if specified on the purchase order.
CAUTION
If the valve must be disassembled for any reason,
first make sure all pressure to the valve is blocked
and pressure trapped in the valve vented safely.
Refer to your company procedures when handling
toxic or other hazardous materials.