50-60 Hanover Road, Florham Park, New Jersey 07932
ASCO Valves
Page 3 of 8 (Section 1 of 2)
Form No.V6371R2-Sec.1
Valve Disassembly
1. Disassemble valve in an orderly fashion using exploded
views on Form No. V6371 - Section 2 of 2 for
identification and placement of parts.
2. Remove solenoid from manual reset housing assembly,
see separate instructions.
3. Unscrew solenoid base sub-assembly from operator
housing using special wrench adapter supplied in ASCO
Rebuild Kit. For wrench adapter only, order ASCO
Wrench Kit No. K218950.
4. Remove solenoid base sub-assembly, core assembly,
solenoid base gasket, and solenoid bushing (not present
on all constructions) from housing (Figure 2).
NOTE: On valves supplied with an watertight-
/explosionproof solenoid enclosure, the core assembly has a
plugnut gasket which seats on the lower flange of the core
assembly.
5. Remove cover screws, instruction plate, position
indicator window and cover gasket from lever side of
operating movement.
6. Loosen the screw on the position indicator assembly on
the valve stem assembly.
7. Remove end cap and end cap gasket.
8. Remove bonnet screws, valve bonnet, closing spring and
body gasket. For 2 1/2
and 3
NPT valves, remove body
passage gaskets (2).
9. Holding the disc nut with a pair of pliers, pull the entire
stem/disc sub-assembly from the valve body.
Simultaneously remove the position indicator assembly
at the top of the stem as the stem/disc sub-assembly is
being pulled from the valve body.
Note: Refer to Figure 3. for disassembly of stem/disc
sub-assembly.
10. Using a vise or a suitable set of locking pliers hold stem
securely as close as possible to disc assembly. Then using
a 7/16
wrench unscrew disc nut from stem/disc
sub-assembly. Remove disc gasket, main disc washer,
main disc, disc spacer, washer and adapter from stem.
Position the parts exactly as they are removed, as the
sequence of disassembly is important for reassembly
and correct operation of the valve.
Service Note
On older valve constructions, the stem is a
stem assembly
and the adapter is not present. When rebuilding valve use
new
stem
and
adapter
supplied in ASCO Rebuild Kit.
11. Remove housing nut and the entire operating
movement.
12. Remove anti-rotation bracket and housing gasket
from bonnet assembly.
13. Unscrew bonnet assembly and remove operator gasket.
14. All parts are now accessible to clean or replace. Replace
worn or damaged parts. However, for best results
replace all parts as supplied with an ASCO Rebuild Kit.
Valve Reassembly
1. Reassemble valve using exploded view for identification
and placement of parts.
CAUTION: Install all parts supplied in ASCO
Rebuild Kit. Do not mix old and new parts. A partial
rebuild may result in valve malfunction.
2. Lubricate the parts listed below with DOW
CORNING
200 fluid lubricant or an equivalent
high-grade silicone grease.
Solenoid base gasket
Operator gasket
Housing gasket
Body gasket
Solenoid bushing
Body passage
gaskets (2)
End cap gasket
Plugnut gasket
Solenoid bonnet gasket
Present with some watertight/explosionproof solenoid
constructions only.
3. Lubricate disc gasket with DOW CORNING
111
Compound lubricant or an equivalent high-grade
silicone grease.
4. Install operator gasket and housing gasket on bonnet
assembly. For valves with 2 ½
or 3
NPT, operator
gasket seats in valve body. Install bonnet assembly into
valve body. For valves with ¾
through 2
NPT
constructions, torque bonnet assembly to 175 ± 25
in-lbs [19,8 ± 2,8 Nm]. For valves of 2 1/2
and 3
NPT
construction, torque bonnet assembly to 50 ± 5 ft-lbs
[67,8 ± 6,8 Nm].
5. Reassemble stem/disc sub-assembly paying careful
attention to exploded views in Figure 3 on page 7 of 8.
Install adapter, washer (concave side up toward stem),
spacer, disc, main disc, main disc washer, disc gasket and
disc nut. Prior to assembly, it is recommended that
LOCTITE
Primer N" or T" be used on threads of
stem and disc nut. Allow primer to air dry for 5 minutes,
then apply LOCTITE
TL290 thread sealer to disc nut
and stem threads. Torque disc nut to 75 ± 10 in-lbs
[8,5 ± 1,1 Nm]. Wipe any excessive amount of thread
sealer from assembly as this sealer is anaerobic and will
remain in a liquid state in the presence of air. For
primed parts allow 30-60 minutes for cure time. For
unprimed parts, allow 2 hours cure time before
operating valve.