Cla-Val 60-11/660-11 Technical Manual - Manual (Page 7)

REASSEMBLY
To reassemble, reverse the order of disassembly
If the disc has been removed, it is important that correct
pressure be on the disc from the disc guide when the
lower stem nut is tight. Use sufficient spacer washers to
obtain slight pressure (by visual indention) on the disc.
Indention should be slight. Refer to seat and disc detail
drawings for location of spacer washers for various valve
sizes.
NOTE: New discs will usually require a different number
of spacer washers to obtain the right amount of "grip" on
the disc.
Place the lower stem assembly onto the seat with the
disc in contact with the valve seat. If a large spring (4",
6", 8" only) was removed upon disassembly, replace on
top of the disc retainer.
The power unit body with gasket, (body to power unit) or
O-ring, can be installed on the body. Be sure the power
unit section is replaced exactly in the same position as
removed. The end of the lower stem will be visible in the
center of the power unit bearing. Care must be taken so
the power unit bearing or lower stem is not damaged
during this assembly. A hoist may be necessary for larg-
er valve sizes.
NOTE: Valves 4" thru 16" use an O-ring body to power
unit seal. During placement onto the body apply a light
weight grease into the power unit groove to hold the O-
ring in place when installing on the body.
Install on the upper stem the lower diaphragm washer,
the diaphragm, the upper diaphragm washer, then screw
the stem nut and tighten securely so the upper and lower
diaphragm washer cannot be turned on the stem. During
the tightening of the upper stem nut, the stem should be
held in a vice with soft brass jaws. The upper stem and
diaphragm assembly can now be lowered into the power
unit bearing, the hollow end of the stem sliding on to the
end of the lower stem. Move the upper stem and
diaphragm assembly up and down to check freedom of
movement of the lower and upper stem.
CAUTION: Do not lubricate or grease the hollow end of
upper stem or upper end of the lower stem. This could
cause the check feature to become inoperative.
Replace cover chamber spring on the upper diaphragm
washer.
NOTE: Some valves may not have a cover chamber
spring.
Place the cover on the power unit body aligning the
index marks. Secure the cover with 8 stud nuts Tighten
the nuts firmly with a cross-over pattern until all nuts are
tight:
NOTE: Valve sizes 1" thru 3" are bolted with 8 nuts
(power unit body to valve body) and 8 nuts (cover to
power unit body). Tighten stud nuts firmly with cross-
over pattern until all nuts are tight.
When the stem is removed from the valve a tool can be
fabricated to check for unrestricted stem movement after
reassembly, and also check for correct stem travel.
Valves size 1 1/4" thru 24/2" are threaded 10-32 UNF
(internal threads) on the top of the stem. Valve sizes 3"
and 4" are threaded ,1/4 -28 UNF. Valve sizes 6" thru 14"
are threaded 34-24 UNF. The 16" valves are thread-
ed,1/2-20 UNF.
A length of rod threaded on one end can be threaded
into the stem through the plug hole in the center of the
cover. It is possible with this rod to move the diaphragm
assembly up from the seat freely, returning to the seat by
its own weight. Larger valve sizes may require a tee
handle to assist lifting heavier assemblies. The stroke of
the stem should correspond closely with the chart.
Reinstall the control system and tubing exactly as it was
before disassembly.
The Powercheck Valve can be tested for tight closure as
well as the tightness of the seal across the diaphragm.
inlet line pressure, or independent operating pressure
can also be used to check the freeness and travel of the
diaphragm assembly. Refer to the operation paragraph
and principle of operation sectional views for opening
and closing operation.
The downstream or outlet shutoff valve remains closed.
If the control system has a pilot or control that can posi-
tion the valve to a closed position, put the control in a
position to close the Powercheck. Lacking a control, inlet
pressure must be connected to the cover of the
Powercheck Valve.
Open upstream gate or line block valve just enough to
allow flow.
Have the power unit body, center section, open to
atmosphere. The power unit body will be atmospheric if
the control is being used.
Partially disconnect a fitting on the discharge side of the
valve. Do not remove fully unless there is no pressure.
After the valve is in the closed position for a few minutes,
all draining of the power unit body should stop. This will
indicate a good seal across the valve seat and the
diaphragm.
USEFUL INFORMATION OR HINTS
1.The approximate volume of liquid discharged from the
chamber above the diaphragm when the valve moves
from the fully closed position to fully open is as follows:
VALVE SIZE
1/2"
3/4"
1"
1 1/4"
1 1/2"
2"
2 1/2"
3"
4"
6"
8"
10"
12"
14"
16" 0.340 Fl. Oz.
0.340 Fl. Oz.
0.700 Fl. Oz.
0.020 Gal.
0.020 Gal.
0.032 Gal.
0.043 Gal.
0.080 Gal.
0 169 Gal
0.531 Gal.
1.260 Gal.
2.510 Gal.
4.000 Gal.
6.500 Gal.
9.570 Gal. .01 Liters
.01 Liters
.02 Liters
.10 Liters
.10 Liters
.10 Liters
.20 Liters
.30 Liters
.60 Liters
2.00 Liters
4.75 Liters
9.50 Liters
15.14 Liters
24.60 Liters
36.20 Liters
DISPLACEMENT