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50-60 Hanover Road, Florham Park, New Jersey 07932
ASCO Valves
e
MCMXCIV All Rights Reserved.
Printed in U.S.A.
Installation & Maintenance Instructions
SERIES
Form No.V6489R1
2-WAY INTERNAL PILOT-OPERATED SOLENOID VALVES
8221
NORMALLY CLOSED OPERATION Ċ SOFT CLOSING
3/8I, 1/2I, OR 3/4I NPT Ċ 9/16I OR 3/4I ORIFICE
IMPORTANT: See separate solenoid installation and
maintenance instructions for information on: Wiring,
Solenoid Temperature, Causes of Improper Operation, Coil
or Solenoid Replacement.
DESCRIPTION
Series 8221 valves are 2-way normally closed, internal
pilot-operated solenoid valves designed for soft closing.
Valves are made of forged brass with internal parts of brass
or stainless steel and elastomers of Buna N or ethylene
propylene depending upon service requirements. Valves
may be provided with a general purpose or
explosionproof/watertight solenoid enclosure.
OPERATION
Normally Closed: Valve is closed when solenoid is
de-energized; open when energized.
IMPORTANT: Minimum operating pressure differential
required is 5 psi. Valve will remain open down to 3 psi
differential.
INSTALLATION
Check nameplate for correct catalog number, pressure,
voltage, frequency, and service. Never apply incompatible
fluids or exceed pressure rating of the valve. Installation and
valve maintenance to be performed by qualified personnel.
Future Service Considerations
Provision should be made for performing seat leakage,
external leakage, and operational tests on the valve with a
nonhazardous, noncombustible fluid after disassembly and
reassembly.
Temperature Limitations
For maximum valve ambient and fluid temperatures, refer
to chart. Check catalog number prefix and suffix on
nameplate to determine the maximum temperatures. See
example following chart.
Construction
Catalog
Number
Catalog
Number
Maximum
Temperature _F
AC or DC
Prefix
Suffix
Ambient Fluid
None None 125 180
HT None 140 180
AC
None HW 125 210
HT HW 140 210
DC
None,
or HT
None 104 150
EXAMPLES: For Catalog No. HT8221G3, AC construction
the maximum ambient temperature is 140_ F with a
maximum fluid temperature of 180_F. For Catalog No.
8221G1HW, AC construction the maximum ambient
temperature is 125_ F with a maximum fluid temperature of
210_F.
Positioning
This valve is designed to perform properly when mounted in
any position. However, for optimum life and performance,
the solenoid should be mounted vertically and upright to
reduce the possibility of foreign matter accumulating in the
solenoid base sub-assembly area.
Piping
Connect piping to valve according to markings on valve
body.
CAUTION: Valves with suffix HW" in the catalog
number are equipped with ethylene propylene
elastomers which can be attacked by oils and
greases. Wipe the pipe threads clean of cutting oils.
Apply pipe compound sparingly to male pipe threads only.
If applied to valve threads, the compound may enter the
valve and cause operational difficulty. Avoid pipe strain by
properly supporting and aligning piping. When tightening
the pipe, do not use valve or solenoid as a lever. Locate
wrenches applied to valve body or piping as close as possible
to connection point.
IMPORTANT: To protect the solenoid valve, install a
strainer or filter suitable for the service involved, in the inlet
side as close to the valve as possible. Clean periodically
depending on service conditions. See ASCO Series 8600,
8601 and 8602 for strainers.
MAINTENANCE
Note: It is not necessary to remove the valve from the
pipeline for repairs.
WARNING: To prevent the possibility of
personal injury or property damage, turn off
electrical power, depressurize valve, and
vent fluid to a safe area before servicing the
valve.
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.
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