I&M No.V7538
50 Hanover Road, Florham Park, New Jersey 07932 www.ascovalve.com
Page 2 of 3
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 of parts.
2. Remove solenoid, see separate instructions.
3. If the valve has a manual operator, refer to section on Manual
Operator Disassembly".
4. Unscrew solenoid base sub-assembly and remove core spring,
core assembly and body gasket.
5. A 4-40 machine screw provided in ASCO Rebuild Kit serves
as a self-tapping screw to remove insert from body. Turn screw
a few turns into through hole located in flat surface of the insert.
CAUTION: Do not damage center hole (pilot orifice) in raised
surface of insert. Remove insert by using a pair of pliers to grip
the head of the screw.
6. Remove three gaskets from insert. Tag each as they are
removed so that they can be reassembled in the same location.
Middle and lower gaskets have the same physical dimensions,
however, the lower gasket is a softer material. Remove disc
holder sub-assembly and disc spring.
7. Remove end cap, end cap gasket and outer piston gasket.
8. Slide out piston assembly and inner piston gasket.
9. All parts are now accessible to clean or replace. Replace worn
or damaged parts with a complete ASCO Rebuild Kit.
Valve Reassembly
1. Reassemble valve using exploded view for identification and
placement of parts.
2. Lubricate all gaskets with DOW CORNING 111 Compound
lubricant or an equivalent high-grade silicone grease.
3. Replace inner piston gasket and slide piston assembly into valve
body.
4. Replace outer piston gasket, end cap gasket and end cap
Torque end cap to 60"10 in-lbs. [6,8"1,1 Nm].
5. Position lower insert gasket and disc holder spring
6. Snap upper and m,middle insert gaskets into grooves of insert.
Lower insert gasket fits into the recess between the lower
corner of the insert and the lower corner of the body insert
cavity. Middle and lower insert gaskets are the same size.
However, the lower gasket is made of a softer material.
7. Place disc holder assembly into insert. Install insert (with gaskets
and disc holder assembly) into body cavity, making certain that the
disc holder spring is centered.
8. If the valve being rebuilt has a manual operator, refer to section on
Manual Operator Reassembly."
9. Replace the solenoid base gasket, core assembly with spring.
10. Replace solenoid base sub-assembly (with core assembly) into
valve body. Torque solenoid base sub-assembly to 175$25
in-lbs. [19,8$2,8 Nm].
11. Install solenoid, see separate instructions and make electrical
connections.
WARNING: To prevent the possibility of death,
serious injury or property damage, turn off electrical
power, depressurize solenoid operator and/or valve,
and vent fluid to a safe area before servicing.
12. Restore line pressure and electrical power supply to valve.
13. 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
WARNING: To prevent the possibility of death,
serious injury or property damage, turn off electrical
power, depressurize solenoid operator and/or valve,
and vent fluid to a safe area before servicing.
1. Remove retaining screws (2)
2. Slide out manual operator stem/knob/retainer sub-assembly.
3. Remove stem gasket, guide and guide gasket. Remove spring
(Suffix MS) only.
4. All manual operator parts are now accessible to clean or
replace. Replace worn or damaged parts with a complete
ASCO Rebuild Kit.
Manual Operator Reassembly
1. Reassemble manual operator using exploded view for
identification and placement of parts.
2. Lubricate all gaskets with DOW CORNING 111 Compound
lubricant or an equivalent high-grade silicone grease.
3. Replace guide gasket, guide and stem gasket. Replace spring
(Suffix MS) with small end on stem first.
4. Screw stem/knob/retainer into valve body using two retaining
screws. Torque retaining screws to 25"5 in-lbs. [2,8"0,6 Nm].
ORDERING INFORMATION
FOR ASCO REBUILD KITS
Parts marked with an asterisk (*) in the exploded views 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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