Installation & Maintenance Instructions
3—WAY PISTON VALVE
BULLETIN
8321
I&M No.V5417R3
DESCRIPTION
Bulletin 8321 is an internal pilot operated 3-way solenoid valve. Stand-
ard valves have a General Purpose Nema Type 1 Solenoid Enclosure.
Valves may also be equipped with an enclosure which is designed to
meet Nema Type 4-Watertight, Nema Type 7 (C or D) Hazardous
Locations — Class 1, Group ‘C’ or ‘D’ and Nema Type 9 ('E’, ‘'F' or
‘G’') Hazardous Location — Class II, Group ‘E’, ‘F’ or ‘G".
MANUAL OPERATOR (Optional)
Valves with suffix “MO” or “MS” after catalog number are provided
with a manual operator which allows manual operation when desired or
during an interruption of electrical power.
OPERATION
NORMALLY CLOSED (Refer to Figure 1)
Solenoid De-energized: Flow is from Cylinder ‘A’ to Exhaust. Pressure
connection is closed.
Solenoid Energized: Flow is from Pressure to Cylinder ‘A’. Exhaust
connection is closed,
NORMALLY OPEN (Refer to Figure 1)
Solenoid De-energized: Flow is from Pressure to Cylinder ‘A’. Exhaust-
connection is closed. | |
Solenoid Energized: Flow is from Cylinder ‘A’ to Exhaust. Pressure
connection is closed.
NORMALLY CLOSED FLOW DIAGRAMS
DE - ENERGIZED ENERGIZED
CYLINDER CYLINDER
"A" "A"
EXHAUST PRESSURE EXHAUST PRESSURE
€ P’ E Р'
NORMALLY OPEN FLOW DIAGRAMS
DE - ENERGIZED ENERGIZED
CYLINDER CYLINDER
‘A’ ‘A’
EXHAUST PRESSURE EXHAUST PRESSURE
E P E P
FIGURE 1
INSTALLATION
Check nameplate for correct catalog number, pressure, voltage and
service.
POSITIONING
valve may-be mounted in any position,
PIPING
Connect piping to the Pressure (P}, Exhaust (E), and Cylinder (A) Ports
according to flow diagram. If a speed /fiow control valve is used, it must
be located in the, piping between the solenoid valve and the cylinder.
For precision control of cylinder positions, there should be no leaks in
piping between cylinder and valve. Apply pipe compound sparingly to
male pipe threads only; if applied to valve threads, it may enter valve
and cause operational difficulty. Pipe strain should be avoided by
proper support and alignment of piping. When tightening pipe, do not
use valve as a lever, |
ASCO Valves «
©ASCO Valve, Inc.® 50 Hanover Road, Florham Park, New Jersey 07932 www.ascovalve.com
CAUTION: To insure operation of the valve, the pressure and exhaust
fines must be. full area without restriction, and a minimum differential
pressure as stamped on the nameplate must be maintained between the
pressure and exhaust. Do not install any restrictive devices in either the
pressure (inlet) connection or the exhaust (outlet) connection of the
valve, Restricting either of these lines may cause valve malfunction.
Should metering or restrictive devices be required they must be in-
stalled in cylinder connection (between solenoid vaive and cylinder).
IMPORTANT: For protection of the solenoid valve, install a strainer or
filter suitable for the service involved in the inlet side as close to the
valve as possible. Periodic cleaning is required, depending on the service
conditions. See Bulletins 8600, 8601 and 8602 for strainers.
WIRING
Wiring must comply with Local and National Electrical Codes. For
valves equipped with an explosion-proof, watertight enclosure (Nema 4,
7 & 9), the electrical fittings must be approved for use in the approved
hazardous locations. Housings for all solenoids are made with connect-
‘ions for 1/2 inch conduit. The general purpose enclosure may be
rotated to facilitate wiring by removing the retaining cap. After rotating
to desired position, be certain to replace cap before operating.
SOLENOID TEMPERATURE
Standard catalog valves are supplied with coils designed for continuous
duty service. When the solenoid is energized for a long period, the
solenoid enclosure becomes hot and can be touched by hand for only
an instant. This is a safe operating temperature. Any excessive heating
will be indicated by the smoke and odor of burning coil insulation.
MAINTENANCE
WARNING: Turn off electrical power and line pressure to valve before
making repairs. It is not necessary to remove valve from pipe line for
repairs.
CLEANING
A periodic cleaning of all solenoid valves is desirable. The time between
cleanings will vary, depending on the media and service conditions. in
general, if the voltage to the coil is correct, sluggish valve operation or
excessive leakage will indicate that cleaning is required.
PREVENTIVE MAINTENANCE
1. Keep the medium flowing through the valve as free from dirt and
foreign material as possible.
2. Operate the valve periodically to insure proper opening and closing.
3. Periodic inspection (depending on media and service conditions) of
internal valve parts for damage or excessive wear is recommended.
Thoroughly clean all parts. Replace any parts that are worn or
damaged.
THMPERATURE LIMITATIONS
For maximum valve ambient and fluid temperatures, refer to chart
below. Por higher ambient and fluid temperatures, consult
— factory. Check catalog number and watt rating on nameplate to
determine the maximum temperatures.
CATALOG MAXIMUM MAX IMUM
WATTAGE NUMBER COIL AMBIENT FLUID
COIL CLASS TEMP. °F TEMP. °F
PREFIX
6 none or S A 77 180
6 FT or ЗЕ Р 122 200
6 HT _— | H 140 200
9.7 none, FT, HT | А, Е ог Н 77 120
В, or SF
IMPROPER OPERATION
1. Faulty Control Circuit: Check the electrical system by energizing
the solenoid. A metallic click signifies 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.
Page 1 of 2
E201671-03/09 All Rights Reserved.
. Burned-Out Coil: Check for open-circuited coil. Replace coil if
necessary.
at least 85% of nameplate rating.
. Incorrect Pressure: Check valve pressure. Pressure to valve must be
within the range specified on nameplate.
a ON
assemble valve (See Valve ‘Disassembly Instructions) and clean. all
parts and passageways. Replace worn or damaged parts with a com-
. plete “Spare Parts Kit” for best results.
COIL REPLACEMENT (Refer to Figure 2)
Turn off electrical power, disconnect coil lead wires.
CAUTION: The solenoid must be fully reassembled as the housing is
part of, and completes the magnetic circuit. Be careful to place in-
sulating washers at each end of the coil if required.
1. Remove retaining cap, nameplate and solenoid cover,
2. Slip yoke containing coil, sleeves and insulating washers off the
solenoid base sub-assembly. NOTE: insulating washers are omitted.
when molded coil is used. In some D-C Constructions, a single flux
plate over the coil replaces yoke, sieeves and insulating washers.
3. Reassemble in reverse order of disassembly.
VALVE DISASSEMBLY AND REASSEMBLY (Refer to Figure 2)
Depressurize valve and turn off electrical power.
1. Solenoid may be removed intact by loosening and removing solenoid |
base sub-assembly from body.
2. Remove core spring, core assembly and body gasket respectively.
3. A 4-36 Machine Screw (provided in “Spare Parts Kits”) serves as a
self-tapping screw to remove insert from body. Thread screw a few a
turns in thru hole located in the flat surface of insert. CAUTION:
Do not damage center hole (Pilot Orifice) in raised surface of insert.
Remove insert by using a pair of pliers on the head of the screw.
4. Remove three gaskets from insert. Tag'each as they are removed so
that they can be reassembled in the same locations. NOTE: Middle
and lower gaskets have the same physical dimensions, however, the
lower gasket is made of a softer material.
pletes pilot disassembly.
Remove end cap, end cap gasket and outer piston gasket.
. Slide out piston assembly and inner piston gasket.
. All parts and passageways are now accessible for cleaning or replace-
ment. Replace worn or damaged parts with a complete “Spare Parts
Kit” for best results.
ONO ©
9. Reassemble valve in reverse order of disassembly. NOTE: Lubricate
ali rubber parts with Dow Corning's Valve Seal or equivalent silicone |
grease.
MANUAL OPERATOR DISASSEMBLY AND REASSEMBLY
(Refer to Figure 3)
Depressurize valve and turn off electrical power,
. Remove two retaining screws.
. Slide out manual operator stem/knob/retainer sub-assembly.
Remove stem O-ring.
Remove guide and gasket.
AS HN
Kit” for best results.
6. Reassembie manual operator in reverse order of disassembly. NOTE:
Lubricate all rubber parts with Dow Corning's Valve Seal or
equivalent silicone grease.
SPARE PARTS KITS
Spare Parts Kits and Coils are available for ASCO valves.
Parts marked with an asterisk (*) are supplied in Spare Parts Kits.
ORDERING INFORMATION
FOR SPARE PARTS KITS
When Ordering Spare Parts Kits or Coils
- Specify Valve Catalog Number,
Serial Number and Voitage.
Page 2 of 2
Low Voltage: Check voltage across the coil leads. Voltage must be
Excessive Leakage (Improper Opening and Closing of Ports): Dis-
Remove lower disc holder assembly and lower disc spri na. This com-
©——RETAINING
. ~~ NAMEPLATE
| SOLENOID Col COVER
~
PLATE
CORE SPRING
"PROTRUDES FR
_ CORE ASSEMBLY 3%
BODY GASKET 3%
('O' RING)
Oo UPPER INSERT GASKET À
/ - (O RING)
- (SUB- ASSEMBLY) SCREW TO REMOVE INSERT
CAP Je — X DENOTES PARTS INCLUDED
IN SPARE PARTS KIT
SLEEVE
—— INSULATING WASHER
(OMITTED WHEN A MOLDED
COIL IS USED}
COIL
—=— INSULATING WASHER
{OMITTED WHEN A MOLDED
COIL 1S USED)
—e——————— _— SLEEVE
4-36 MACHINE SCREW +
(SERvS AS A SELF- TAPPING
(CLOSED END - FROM BODY, REMOVE SCREW
OM TOP OF CORE), FROM INSERT BEFORE
REASSEMBLING. )
HOLE FOR
MACHINE SCREW
> PILOT ORIFICE
DO NOT DAMAGE
INSERT
— LOWER DISC HOLDER ASSEMBLY Y
‚ | > (ASSEMBLY)
% PISTON GUIDE GASKET — 0
32 END CAP GASKET О (7
À MIDDLE INSERT GASKET ben HAVE THE SAME
(ap -—Z-*+©Ap» LOWER INSERT GASKET
LOWER DISC SPRING 2%
THESE TWO INSERT "O° RING
"O RING) PHYSICAL DIMENSIONS HOW-
EVER THE LOWER GASKET IS
(O RING) A SOFTER MATERIAL.
VALVE BODY
PISTON GUIDE GASKET $€
PISTON/PISTON GUIDE =#
Manual operator parts are now accessible for cieaning or replace-
ment. Replace worn or damaged parts with a complete “Spare Parts
END CAP
FIGURE 2 BULLETIN 8321
VALVE BODY | —ees
¡O —n—— GASKET
GUIDE
STEM/KNOB/ RETAINER 5
(SUB ASSEMBLY)
FIGURE 3
== STEM GASKET
(O RING)
$
0):
di
MANUAL OPERATOR
(PUSH TYPE MO”)
(SCREW TYPE ‘MS')
SCREW
l&M No.V5417R3
©ASCO Valve, Inc.® 50 Hanover Road, Florham Park, New Jersey 07932 www.ascovalve.com
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