50 Hanover Road, Florham Park, New Jersey 07932 www.ascovalve.com
Page 2 of 4 Form No.V5455R5
Valve Disassembly
1. Disassemble valve in an orderly fashion using exploded views
for identification and placement of parts. Refer to Figure 2
for AC construction; Figure 3 for DC construction.
2. Remove solenoid enclosure. See separate instructions.
3. Unscrew solenoid base sub-assembly. For DC construction, a
special wrench is supplied in ASCO Rebuild Kit. For wrench
only, Order ASCO Wrench Kit No. K168146-001.
4. Remove bonnet screws, valve bonnet,bonnet gasket, spring
retainer (AC construction only) core spring, core/diaphragm
sub-assembly and body gasket.
5. For valves equipped with a manual operator, remove cap, cap
gasket, bonnet and bonnet gasket. Remove stem assembly with
stem gasket from bonnet.
6. All parts are now accessible for cleaning or replacement
. If
parts are worn or damaged, install a complete ASCO Rebuild
Kit.
Valve Reassembly
1. Lubricate all gaskets and the disc at the base of the core
/diaphragm sub-assembly with DOW CORNING 111
Compound lubricant or an equivalent high-grade silicone
grease.
2. Replace body gasket and core/diaphragm sub-assembly.
Locate bleed hole in core/diaphragm sub-assembly directly
over valve outlet. For 1 1/2 NPT construction, locate bleed
hole in core/diaphragm sub-assembly approximately 30 from
valve outlet.
3. Replace core spring and spring retainer (AC construction
only). Install small end of core spring in core first, wide end
protruding from top of core. For DC construction, install
core spring, small end down toward valve body.
4. Replace valve bonnet and bonnet screws. Hand tighten bonnet
screws as far as possible.
IMPORTANT: Press firmly down on core/diaphragm
sub-assembly to seat diaphragm assembly against valve seat.
While holding this position, torque bonnet screws in a crisscross
manner to 144 ± 15 in-lbs [16,3 ± 1,7 Nm].
5. Replace bonnet gasket and solenoid base sub-assembly.
Torque solenoid base sub-assembly to 175 ± 25 in-lbs
[19,8 ± 2,8 Nm]. For DC construction, the solenoid base
sub-assembly must be placed inside the housing before
assembling into the valve body. Before doing this, read
separate lubrication instructions in Solenoid Installation &
Maintenance Instructions.
6. For valves provided with a manual operator, replace stem
assembly and bonnet (with gaskets). Torque bonnet to 75 ± 10
in-lbs [8,5 ± 1,1 Nm]. Replace cap gasket and cap.
7. Install solenoid. See separate instructions.
WARNING: To prevent the possibility of death,
serious injury or property damage, check valve for
proper operation before returning to service. Also
perform internal seat and external leakage tests with
a nonhazardous, noncombustible fluid.
8. Restore line pressure and electrical power supply to valve.
9. After maintenance is completed, operate the valve a few times
to be sure of proper operation. A metallic click signifies the
solenoid is operating.
ORDERING INFORMATION
FOR ASCO REBUILD KITS
Parts marked with an asterisk (*) in the exploded view are supplied in
Rebuild Kits. When Ordering Rebuild Kits for ASCO valves, order
the Rebuild Kit number stamped on the valve nameplate. If the
number of the kit is not visible, order by indicating the number of kits
required, and the Catalog Number and Serial Number of the valve(s)
for which they are intended.
Torque Chart
Part Name
Torque Value
Inch-Pounds
Torque Value
Newton-Meters
Manual
operator bonnet
75 ± 10 8,5 ± 1,1
Figure 1. Manual operator (optional feature)
valve
Indicates Parts Supplied
In ASCO Rebuild Kits
bonnet
stem
stem
bonnet
cap
cap
gasket
assembly
gasket
gasket
body
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