MAINTENANCE
WARNING: To prevent the possibility of death,
serious injury or property damage, turn off electrical
power, depressurize valve, and vent fluid to a safe
area before servicing the valve.
NOTE: It is not necessary to remove the valve from the pipeline for
repairs.
Cleaning
All solenoid valves should be cleaned periodically. The time between
cleanings will vary depending on the medium and service conditions.
In general, if the voltage to the coil is correct, sluggish valve operation,
excessive noise or leakage will indicate that cleaning is required. In the
extreme case, faulty valve operation will occur and the valve may fail to
open or close. Clean strainer or filter when cleaning the valve.
Preventive Maintenance
• Keep the medium flowing through the valve as free from dirt and
foreign material as possible.
• While in service, the valve should be operated at least once a
month to insure proper opening and closing.
• Depending on the medium and service conditions, periodic
inspection of internal valve parts for damage or excessive wear
is recommended. Thoroughly clean all parts. If parts are worn or
damaged, install a complete ASCO Rebuild Kit.
Causes of Improper Operation
• Incorrect Pressure: Check valve pressure. Pressure to valve must
be within range specified on nameplate.
• Excessive Leakage: Disassemble valve and clean all parts. If
parts are worn or damaged, install a complete ASCO Rebuild Kit.
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.
• For AC construction (standard or with manual operator),
proceed as follows:
3. For standard construction, remove bonnet screws, solenoid
base sub-assembly, core spring, core assembly, diaphragm
spring, diaphragm assembly and body gasket from valve body.
4. For manual operator constructions, unscrew solenoid base sub-
assembly first then follow step 3 for removal of parts.
5. For normal maintenance (cleaning) it is not necessary to
disassemble the manual operator unless an ASCO Rebuild Kit
is being installed. To disassemble, remove stem pin, manual
operator stem, stem spring and stem gaskets (2).
• For DC construction (standard or with manual operator),
proceed as follows:
6. Unscrew solenoid base sub-assembly first then follow step 3
and 5 for removal of parts.
Note: Diaphragm spring is omitted for DC construction.
7. 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 body gasket and solenoid base gasket with DOW
CORNING®200 Fluid lubricant or an equivalent high-grade
silicone fluid.
2. Lubricate manual operator stem gaskets (2) with DOW
CORNING®111 Compound lubricant or an equivalent high-
grade silicone grease.
3. Replace body gasket and diaphragm assembly. Locate bleed
hole in diaphragm assembly approximately 45°from valve
outlet.
• For AC construction (standard or with manual operator),
proceed as follows:
4. Position diaphragm spring on diaphragm assembly. Be sure
large end of diaphragm spring seats in cup of diaphragm
assembly. For manual operator constructions,small end of
diaphragm spring seats in cup of diaphragm assembly.
5. Install wide end of core spring in core assembly first, closed
end protrudes from top of core assembly.
6. For standard construction, position core assembly with core
spring and solenoid base sub-assembly (integral with bonnet)
over diaphragm spring and diaphragm assembly.
7. Install bonnet screws and hand thread screws as far as possible,
then torque bonnet screws in a crisscross manner to 95 ± 10
in-lbs [10,7 ± 1,1 Nm].
8. For valve constructions with a manual operator, first install
valve bonnet and bonnet screws as described in step 7.
9. Install solenoid base gasket,core assembly with core spring
and solenoid base sub-assembly.
10. Torque solenoid base sub-assembly to 175 ± 25 in-lbs [19,8 ±
2,8 Nm].
11. For valves with a manual operator proceed as follows:
A. Install two manual operator stem gaskets on stem. Refer
to Step 2 for lubrication instructions.
B. Install stem spring and stem assembly with gaskets into
valve bonnet.
C. Push stem assembly into valve bonnet; align stem pin
hole and install stem pin.
D. Operate manual operator to be sure there is no
misalignment or binding. Then rotate manual operator
stem counterclockwise as far as possible.
• For DC construction (standard or with manual operator),
proceed as follows:
12. For standard or manual operator constructions, replace valve
bonnet and follow steps 7, 9 and 10. For manual operator
constructions, install core spring in core assembly following
step 5.
13. 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.
14. Restore line pressure and electrical power supply to valve.
15. 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.
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©ASCO Valve, Inc.® 50 Hanover Road, Florham Park, New Jersey 07932 www.ascovalve.com
I&M No. V 9810
