User Guide
I&M No.V6296R2
Page 2 of 4
50 Hanover Road, Florham Park, New Jersey 07932 www.ascovalve.com
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 valve strainer or filter when cleaning
the valve.
Preventive Maintenance
Keep medium flowing through the valve as free from dirt
and foreign material as possible.
Periodic exercise of the valve should be considered if
ambient or fluid conditions are such that corrosion,
elastomer degradation, fluid contamination build up, or
other conditions that could impede solenoid valve
shifting are possible. The actual frequency of exercise
necessary will depend on specific operating conditions. A
successful operating history is the best indication of a
proper interval between exercise cycles.
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 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 (Refer to Figure 3 on page 4)
1. Disassemble valve in an orderly fashion. Use exploded
views for identification and placement of parts.
2. Remove solenoid, see separate instructions.
3. If the valve being serviced has a manual operator, suffix
MO in the catalog number, refer to section on ManualĂ
Operator Disassembly.
4. Unscrew solenoid base sub-assembly and remove
solenoid base gasket, core assembly with core spring.
5. For normal maintenance, it is not necessary to remove
the valve seat. However, if valve seat removal is
required, use a 7/16 socket wrench.
6. Dislodge retainer from metering pin passageway and
remove metering pin with gasket. Then remove
metering pin gasket from metering pin.
7. Remove bonnet screws, valve bonnet, piston spring,
piston assembly, support, lip seal, body gasket, and body
passage gasket.
8. Remove aspirator tube and disc with disc gasket from
piston.
9. All parts are now accessible to clean or replace. If parts
are worn or damaged, install a complete ASCO Rebuild
kit.
Valve Reassembly
1. Reassemble valve using exploded views for
identification and placement of parts.
2. Lubricate the solenoid base gasket, body gasket, body
passage gasket, metering pin gasket, and the surface of
the piston which contacts the lip seal with
DOW CORNING 200 Fluid lubricant.
3. Lubricate disc and disc gasket with DOW CORNING
111 Compound lubricant or an equivalent high-grade
silicone grease.
4. Position body gasket, body passage gasket, and support
in valve body.
5. Install aspirator tube and disc with disc gasket in piston.
6. Position lip seal, flanged end out, onto piston assembly.
Install piston assembly with lip seal into support in valve
body cavity.
7. Replace piston spring, valve bonnet, and bonnet screws.
Torque bonnet screws in a crisscross manner to 144± 15
in-lbs [16,3 ± 1,7 Nm].
8. Replace valve seat with a small amount of thread
compound on the seat threads. Torque valve seat to 65
± 15 in-lbs [7,3 ± 1,7 Nm].
9. Install metering pin with metering pin gasket into valve
body. Replace retainer and refer to Adjustable Bleed
Device section for metering pin adjustment.
10. If the valve being serviced has a manual operator, refer
to Manual Operator Reassembly section.
11. Replace solenoid base gasket, core assembly, core
spring, and solenoid base sub-assembly. Torque
solenoid base sub-assembly to 175 ± 25 in-lbs [19,8 ±
2,8].
12. Install solenoid, see separate instructions and make
electrical hookup.
WARNING: To prevent the possibility of
death, personal injury or property damage, check
valve for proper operation before returning to
service. Also perform internal seat and external
leakage tests with a nonhazardous, noncombusĆ
tible fluid.
13. Restore line pressure and electrical power supply to valve.
14. After maintenance is completed, operate the valve a
few times to be sure of proper operation. A metallic
click signifies the solenoid is operating.
Manual Operator Disassembly
1. Refer to Valve Disassembly section and follow step 1 and 2.
2. For AC construction refer to Figure 1 on page 3; DC
construction Figure 2 on page 3.
3. Unscrew solenoid base sub-assembly from manual
operator body.
4. Unscrew manual operator body and remove this
assembly intact. Remove body gasket from main valve
body.
5. Before removing the stem retainer from the manual
operator body, note the location of captive spacing
washer on the stem/lever sub-assembly. The captive
spacing washer will be on the inside of the fork on the
stem retainer for AC construction and on the outside for
DC construction. Location of this captive spacing
washer is important for reassembly.
6. Remove stem/lever sub-assembly with stem gasket
from manual operator body. Remove solenoid base
gasket, core assembly with core spring.