User Guide
Page 1 of 4
50-60 Hanover Road, Florham Park, New Jersey 07932
ASCO Valves
MCMXCIX All Rights Reserved.
Printed in U.S.A.
Installation & Maintenance Instructions
SERIES
Form No.V6493R3
2-WAY INTERNAL PILOT-OPERATED SOLENOID VALVES
8221
NORMALLY OPEN OPERATION Ċ SOFT CLOSING
1, 1 ¼, 1 ½, 2, OR 2 ½ NPT
NOTICE: 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 open, 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 Open: Valve is open when solenoid is
de-energized; closed when energized.
IMPORTANT: Minimum operating pressure differential
required is 5 psi. Valve will remain open down to 3 psi
differential once opened at 5 psi or higher.
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
AC or DC
Catalog
Number
CatalogĆ
Number
Maximum
Temperature
AC or DC
Number
Prefix
Number
Suffix
Ambient Fluid
None, DF
KF, SF or
SC
None
125 F
(51.7 C)
180 F
(82
C)
AC
HT,KH, ST
or SU
None
140 F
(60 C)
(82 C)
AC
None, DF
KF, SF or
SC
HW
125 F
(51.7 C)
210 F
(99
C)
HT,KH,
ST or SU
HW
140 F
(60 C)
(99 C)
DC
None,
or HT
None
77 F
(25 C)
150 F
(66 C)
EXAMPLES: For Catalog No. HT822127, AC construction
the maximum ambient temperature is 140 F with a
maximum fluid temperature of 180F. For Catalog No.
822129HW, AC construction the maximum ambient
temperature is 125 F with a maximum fluid temperature of
210F.
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 or tubing 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. Use on oil-free systems only. Wipe the
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.
CAUTION: 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
WARNING: To prevent the possibility of
death, serious injury or property damage,
turn off electrical power, depressurize valve,
and vent fluid to a safe area before servicing
the valve.
NOTE: It is not necessary to remove the valve from the
pipeline for repairs.