Groth 1660A - Manual (Page 6)

Page 6 of 16
Table 3
Bolt Torque - Flat Face Flange
ANSI
150#
Drilling
Number
of
Bolts
Stud
Size
UNC
Torque
Ft. Lb.
(Kg. m)
2” 4 5/8”-11 81 (11)
3” 4 5/8”-11 106 (15)
4” 8 5/8”-11 68 (9.4)
6” 8 3/4"-10 101 (14)
8” 8 3/4"-10 142 (20)
10” 12 7/8”-9 138 (19)
12” 12 7/8”-9 179 (25)
Torque values are based on 30 PSI pressure and
gasket factors: m = 3.5 & y = 4000
Table 4
Bolt Torque - Raised Face Flange
ANSI
150#
Drilling
Number
of
Bolts
Stud
Size
UNC
Torque
Ft. Lb.
(Kg. m)
2” 4 5/8”-11 31 (4.3)
3” 4 5/8”-11 43 (6.0)
4” 8 5/8”-11 29 (4.0)
6” 8 3/4"-10 51 (7.1)
8” 8 3/4"-10 78 (11)
10” 12 7/8”-9 75 (10)
12” 12 7/8”-9 93 (13)
TROUBLESHOOTING GUIDE
PROBLEM INSPECTION SUGGESTED CORRECTIVE ACTION
Pilot Valve
Leak Visual, audible or
vapor detector Consult troubleshooting guide in specific pilot valve manual
Main Valve
Actuator Leak Visual, audible or
vapor detector Leakage at the actuator flange may be corrected by tightening
the fasteners adjacent to the leak path. If this is not successful,
it will be necessary to install a new gasket. Refer to page 10,
Assembly.
Vapor leakage
from the valve
body outlet. Visual, audible or
vapor detector Leakage can occur at the valve body seat - FEP film interface;
other leak paths are the swivel seal or a torn actuator
diaphragm. After removing the upper actuator housing, lift the
pallet assembly off the seat and inspect for damage to the film
or foreign debris buildup on the seat or film. Clean or replace
diaphragm as required. Refer to page 9, Film Seat Pallet.
Vapor leakage
between the
valve body and
tank nozzle Visual, audible or
vapor detector Leakage between the flanges may be corrected by tightening
the fasteners. Follow instructions listed on page 5, Installation.
The gasket may have deteriorated due to the chemical
environment; replace if required. The tank nozzle may be
warped, corroded or scratched. This will require resurfacing of
the flange face; note that a flat-faced flange is recommended to
avoid potential damage to an aluminum valve body.
MAINTENANCE
The 1660A POV does not require routine
lubrication or adjustments. It should be
checked periodically, at least twice a year, to
confirm that the valve is functioning properly
and that the set point is correct. Test
connections can be provided to facilitate
testing the valve in the field.
The pilot valve is designed to function in a fail-
safe manner. The failure of a seal or
diaphragm will cause pressure to be vented to
the atmosphere; the resulting loss in pressure
will cause the main valve to open under rising
pressure.
Periodic inspection for seat tightness is
recommended to ensure compliance with local
air pollution control requirements. If the valve
relieves to the atmosphere, this may be
accomplished with a gas detector calibrated
for the principle product in the system.
The valve will need to be periodically removed
from the tank for inspection of diaphragms,
gaskets and seals. When this is done, the
valve must be carefully lifted using the lifting
eyes on the actuator housing. Refer to
handling instructions listed in the Installation
section of this manual.