Grain Systems PNEG-526 - Manual (Page 182)

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Installation & Maintenance Instructions
SERIES
Form No.V5495R4
2-WAY INTERNAL PILOT-OPERATED SOLENOID VALVES 8215
NORMALLY CLOSED OPERATION - 3/8I, 1/2I, OR 3/4I NPT
IMPORTANT: See separate solenoid installation and maintenance
instructions for information on: Wiring, Solenoid Temperature, Causes of
Improper Operation, Coil, or Solenoid Replacement.
DESCRIPTION
Series 8215 valves are 2-way normally closed internal pilot-operated
solenoid valves. Valve bodies are made of rugged aluminum with trim and
internal parts made of steel and stainless steel. Series 8215 valves may be
provided with a general purpose, explosionproof, or
watertight/explosionproof solenoid enclosure.
OPERATION
Normally Closed: Valve is closed when solenoid is de-energized; open when
energized.
NOTE: No minimum operating pressure differential required.
INSTALLATION
CAUTION: Not all valves are approved for fuel gas service. 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 below.
Check catalog number prefix on nameplate to determine maximum
temperatures.
Construction
AC or DC
Coil
Insulation
Class
Catalog
Number
Prefix
Max.
Ambient
Temp _ F
Max.
Fluid
Temp _ F
AC
F
H
None
H
125
140
125
140
DC
11.2 watts
F or H
None or
HT
77 77
DC
11.6 watts
F or H
None or
HB
104 104
Positioning
AC Construction: Valve is designed to perform properly when mounted in
any position. However, for optimum life and performance, the solenoid
should be mounted vertical and upright so as to reduce the possibility of
foreign matter accumulating in the solenoid base sub-assembly area.
DC Construction: Valve must be mounted with solenoid vertical and upright.
Mounting
For mounting bracket (optional feature) dimensions, refer to Figure 1.
Piping
Connect piping to valve according to markings on valve body. 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 avoid damage to the valve body, DO NOT OVERTIGHTEN
PIPE CONNECTIONS. If Teflon* tape, paste, spray, or similar lubricant is
used, use extra care when tightening due to reduced friction.
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
WARNING: To prevent the possibility of
death, serious injury or property damage, turn off
electrical power, depressurize valve, extinguish all
open flames and avoid any type of sparking or
ignition. Vent hazardous or combustible fluid to
a safe area before servicing the valve.
NOTE: It is not necessary to remove the valve from the pipeline for repairs.
Service Notice
CAUTION: Series 8215C and 8215G valve parts are not interchangeable
with Series 8215B valves. Series 8215B valves have a different valve body
and a core/diaphragm sub-assembly with a diaphragm disc. Interchanging
parts will cause valve malfunction. See Figure 1 for identification of parts.
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
valve strainer or filter when cleaning the valve.
Preventive Maintenance
1. Keep the medium flowing through the valve as free from dirt and
foreign material as possible.
2. While in service, the valve should be operated at least once a month to
insure proper opening and closing.
3. Depending on the medium and service conditions, periodic inspection
of internal valve parts for damage or excessive wear is recommended.
Thoroughly clean all parts. If parts are worn or damaged, install a
complete ASCO Rebuild Kit.
Causes of Improper Operation
1. Incorrect Pressure: Check valve pressure. Pressure to valve must be
within range specified on nameplate.
2. Excessive Leakage: Disassemble valve and clean all parts. If parts are
worn or damaged, install a complete ASCO Rebuild Kit.
Valve Disassembly
1. Remove solenoid, see separate instructions.
2. Unscrew solenoid base sub-assembly and body gasket.
3. Remove bonnet screws, valve bonnet, solenoid base gasket,
core/diaphragm sub-assembly and body gasket.
4. All parts are now accessible to clean or replace. If parts are worn or
damaged, install a complete ASCO Rebuild Kit.
Valve Reassembly
1. Lubricate solenoid base gasket and body gasket with DOW
CORNINGr 200 Fluid lubricant or an equivalent high-grade silicone
fluid.
2. Install body gasket and core/diaphragm sub-assembly in valve body.
Locate the bleed hole in the diaphragm assembly approximately 45_
from valve outlet. The core/diaphragm sub-assembly is comprised of
a rider ring, core spring, core guide, hanger spring, core assembly, and
diaphragm assembly.
CAUTION: D o not distort hanger spring between core assembly and
diaphragm assembly.
*DuPont Co. Registered Trademark