50 Hanover Road, Florham Park, New Jersey 0793 www.ascovalve.com
Page of 4 Form No.V5411R4
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
SKeep the medium flowing through the valve as free from dirt and
foreign material as possible.
SWhile in service, the valve should be operated at least once a
month to insure proper opening and closing.
SDepending 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
SIncorrect Pressure: Check valve pressure. Pressure to valve must
be within range specified on nameplate.
SExcessive 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 igure1 &
2 for AC construction; igure 3 for DC construction.
2. Remove solenoid enclosure. See separate instructions.
3. Unscrew solenoid base sub-assembly. or DC construction, a
special wrench is supplied in ASCO Rebuild Kit. or wrench
only, Order ASCO Wrench Kit No. K168146-001.
4. Remove bonnet screws, valve bonnet, bonnet gasket,
piston/core sub-assembly with core spring and body gasket
from valve body.
5. or normal maintenance, it is not necessary to remove or
disassemble the manual operator unless external leakage is
evident. If required, proceed a as follows:
SFor 3/4I NPT Valve Construction: Unscrew bonnet from valve
body and remove gasket. Remove stem pin, stem and stem gasket.
SFor 1I NPT Valve Construction: Unscrew stuffing box and
remove stuffing box gasket. Remove knob pin using a suitable
punch. Then remove knob, spring and stem from stuffing box.
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 with DOW CORNINGr 111 Compound
lubricant or an equivalent high-grade silicone grease.
2. Install body gasket in valve body and bonnet gasket in valve
bonnet.
3. Insert piston/core sub-assembly in valve bonnet. To prevent
damage, compress rider rings and piston ring when
preassembling piston/core sub-assembly in valve bonnet. Be
sure there is free movement of the piston/core sub-assembly.
4. When replacing bonnet with piston/core assembly
compressed inside of it, a flat steel rule (or similar flat tool)
may be used to retain the piston/core sub-assembly in the
valve bonnet while bonnet is engaged to the valve body.
5. Torque bonnet screws (4) in a crisscross manner to 110 ±10
in-lbs [12,4 ±1,1 Nm].
6. Replace core spring, for AC construction install wide end of
core spring in core first, closed end protruding from top of core.
or DC construction, install core spring with closed end of core
spring protruding from top of core.
7. Hand thread solenoid base sub-assembly into valve bonnet as
far as possible. Then torque solenoid base sub-assembly to
175 ± 25 in-lbs [19,8 ± 2,8 Nm]. or 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.
8. or valves provided with a manual operator, reassemble in
reverse order of disassembly. Then torque bonnet or stuffing
box to 75 ± 10 in-lbs [8,5 ± 1,1 Nm].
9. Install solenoid. See separate instructions.
WARNING: o 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.
10. Restore line pressure and electrical power supply to valve.
11. 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 INFORM TION
FOR SCO 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.
orque Chart
Part Name orque Value
Inch-Pounds
orque Value
Newton-Meters
Bonnet screws 110 ± 10 1 ,4 ± 1,1
Solenoid base
sub-assembly 175 ± 5 19,8 ± ,8
Bonnet or
Stuffing box 75 ± 10 8,5 ± 1,1
