DV-1/4 Turn IOM - 11/06
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3.4 LEAKAGE THRU THE OUTLET WHEN CLOSED
If leakage is occurring thru the body’s outlet when the
bonnet assembly is in the closed position the
diaphragm may be worn. The diaphragm must be
replaced per Section 3.6.
3.5 EXCESSIVE TORQUE TO ACTUATE VALVE
If more than 60 ft-lbs (81.3 N-m) of torque is required
to actuate the valve verify that the bonnet nuts are
tightened to a torque of 10 ft-lbs (120 in-lbs, 13.5
N-m).
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CAUTION
Nut
assembly torque requirement of 10 ft-lbs
(120 in-lbs, 13.5 N-m)
is critical to the success
of the valve’s sealing function. Excessive
torque decreases the valve’s sealing function
and increases the amount of effort required to
actuate the valve.
If the proper amount of
torque is applied to the bonnet nuts but the
valve requires excessive torque to actuate
contact manufacturer at the address listed on
back page for specific instructions.
3.6 DIAPHRAGM REPLACEMENT
Elastomer diaphragms are not intended to be used
with the quarter turn tote valve. Replacement
diaphragm should be identical in size and grade as
the original diaphragm.
3.6.1 Remove pressure/fluid from the tote tank
containing the valve. The diaphragm can be replaced
with the valve on the tank or after removing the valve
from the tote tank if desired.
3.6.2 Partially opened the valve by rotating the input
shaft counterclockwise. This will ease the pressure
being exerted by the compressor holding the valve
diaphragm to the body weir.
3.6.3 Remove the bonnet nuts. Lift bonnet assembly
from valve body. If the valve is mounted to the tank
support the bonnet assembly as the nuts are
removed.
3.6.4 Unscrew diaphragm from compressor by turning
counterclockwise. Note: Fine bronze shavings may be
present in the bonnet assembly due to component
wear. Clean out these shavings once diaphragm and
backing cushion are removed.
3.6.5 Replace backing cushion and plastic PTFE
diaphragm. Note: To engage the threads of the
diaphragm stud invert the plastic PTFE diaphragm. To
invert the diaphragm, press on the center of the
diaphragm face with thumbs while holding the edge of
the diaphragm with fingers.
3.6.6 Screw new diaphragm into compressor by
turning hand tight. Then back off until holes in
diaphragm and bonnet flange line up.
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CAUTION
Do not overtighten diaphragm.
3.6.7 Assemble the bonnet to the body per Section
1.1.
3.7 LUBRICATION
Only Chevron Poly FM2 (silicone free) lubricant is
permitted on the tote valve's body studs. These are
the only components where lubricant is permitted on
the valve assembly. No lubrication shall be used in
the assembly of the quarter turn bonnet. No
lubrication shall be used on the diaphragm.