IMPROPER OPERATION
1.
Faulty Control Circuit:
Check the electrical system by energizing the
solenoid. A metallic click signifies that the solenoid is operating. Absence
of the click indicates loss of power supply. Check for loose or blown-out
fuses. open circuited or grounded coil. broken lead wires or splice
connections.
2.
Burned-Out Coil:
Check for open circuited coil. Replace coil if necessary.
3.
Low Voltage:
Check voltage across coil leads. Voltage must be at
least 85% of nameplate rating.
4.
Incorrect Pressure:
Check valve pressure. Pressure to valve must be
within range specified on nameplate.
5.
Excessive Leakage:
Disassemble valve and clean all parts. Replace
worn or damaged parts with a complete Spare Parts Kit for best results.
COIL REPLACEMENT
(Refer to Figures 1, 2 and 3)
Turn off electrical power supply and disconnect coil lead wires.
Proceed In the following manner:
1. Remove retaining cap or clip, nameplate and cover.
CAUTION:
When
metal retaining clip disengages. it will spring upwards.
2. Slip yoke containing coil, sleeves and insulating washers off the
solenoid base sub-assembly. For D-C Construction. slip spring washer.
coil and insulating washers off the solenoid base sub-assembly. Insulating
washers are omitted when a molded coil is used.
3. Reassemble in reverse order of disassembly paying careful attention
to exploded views provided for identification and placement of parts.
CAUTION:
Solenoid must be fully reassembled as the housing and
internal parts are part of and complete the magnetic circuit. Place
insulating washers at each end of con, If required.
VALVE DISASSEMBLY
Depressurize valve and turn off electrical power supply. For A-C
Construction, refer to Figures 1 and 2. For D-C Construction, refer to
Figure 3. Proceed In the following manner:
1. Disassemble valve in an orderly fashion. Pay careful attention to
exploded views provided for identification of parts.
2. Remove retaining cap or clip and slip the entire solenoid enclosure off
the solenoid base sub-assembly.
CAUTION:
When metal retaining clip
disengages, it will spring upwards.
3. Unscrew solenoid base sub-assembly and remove bonnet gasket.
Core assembly and core spring.
4. For A-C Construction without manual operator. remove valve bonnet
screws (4). Remove solenoid base sub-assembly. core assembly and
core spring.
5. Remove diaphragm spring (A-C Construction only). diaphragm
assembly and body gasket.
6. For normal maintenance, it is not necessary to disassemble the
manual operator unless external leakage is evident To disassemble,
remove stem pin. manual operator stem. stem spring and stem gasket.
7. All parts are now accessible for cleaning or replacement. Replace
worn or damaged parts with a complete Spare Parts Kit for best results.
VALVE REASSEMBLY
1. Reassemble in reverse order of disassembly paying careful attention
to exploded views provided for identification and placement of parts.
2. Replace body gasket and diaphragm assembly. Locate bleed hole in
diaphragm assembly approximately 45° from valve outlet.
3. Replace valve bonnet and bonnet screws. Torque bonnet screws (4) in
a crisscross manner to 110 ± 10 inch pounds.
4. For A-C Construction, the diaphragm spring. core assembly and core
spring must be installed prior to assembly of bonnet as this is the solenoid
base sub-assembly. Be sure diaphragm spring is installed properly.
Closed turns of spring to seat on diaphragm assembly. For valves with a
manual operator (see Figure 1), the small end of diaphragm spring seats
on diaphragm assembly.
5. Install core spring in core assembly. Be sure core spring is inserted
into core assembly with wide end in first. Closed end protrudes from top of
core assembly.
6. Replace bonnet gasket, core assembly, core spring and solenoid base
sub-assembly. Torque solenoid base sub-assembly to 175 ± 25 inch pounds
7. If removed, replace manual operator stem gasket. stem spring, stem
and stem pin.
8. Replace solenoid enclosure and retaining cap or clip.
9. After maintenance, operate the valve a few times to be sure of proper
opening and closing.
ORDERING INFORMATION
FOR SPARE PARTS KITS
When Ordering Spare Parts Kits or Coils
Specify Valve Catalog Number,
Serial Number and Voltage
Spare Parts Kits
Spare Parts Kits and Coils are available for ASCO valves.
Parts marked with an (*) are supplied in Spare Parts Kits
Bulletin 8210 -- A-C Construction
Manual Operator
(Catalog Number Suffixed “MO”)
Figure 1.
