Asco 8345 Series Instructions d'installation et d'utilisation
Page 1 of 4
50-60 Hanover Road, Florham Park, New Jersey 07 32
ASCO Valves
MCMXCIII All Rights Reserved. Printed in U.S.A.
Installation & Maintenance Instructions SERIES
Form No.V6865R1
- POSITION 4-WAY SOLENOID VALVES 8345
BRASS CONSTRUCTION
1/4 NPT - AIR OR INERT GAS SERVICE
IMPORTANT: See separate solenoid installation
and maintenance instructions for information on:
Wiring, Solenoid Temperature, Causes of ImpropĆ
er Operation, Coil, or Solenoid Replacement
DESCRIPTION
Series 8345 valves are 2- position 4-way solenoid
valves designed for air or inert gas service. Valve
bodies are made of rugged brass. T e valves may
be provided wit a low power or intrinsically safe
solenoid.
OPERATION
Solenoid De-energized: Flow is from Pressure P
to Cylinder A and from Cylinder B to Ex aust EB.
Ex aust EA is closed.
Solenoid Energized: Flow is from Pressure P to
Cylinder B and from Cylinder A to Ex aust EA.
Ex aust EB is closed.
IMPORTANT: Minimum operating pressure
differential is 10 psi
Flow Diagrams
De-energized Energized
EB
BEAA
P
EB
BEAA
P
INSTALLATION
C eck nameplate for correct catalog number,
pressure, voltage, frequency, and service. Never
apply incompatible fluids or exceed pressure
rating of t e valve. Installation and valve
maintenance to be performed by qualified
personnel.
Temperature Limitations
Fluid and ambient temperature range: -4F to
+140F.
Future Service Considerations
Provision s ould be made for performing seat
leakage, external leakage, and operational tests on
t e valve wit a non azardous, noncombustible
fluid after disassembly and reassembly.
Positioning
Valve may be mounted in any position.
Mounting
For mounting valve body refer to Figure 1.
[41,3]
[7, ]
[5,6]
5/16
1 5/8
7/32
2 slots for mounting
Figure 1. Dimensions for mounting valve body.
Piping
T ere are two ex aust ports EA and EB. Ex aust
ports EA and EB may be connected to a common
ex aust if t e air or inert gas cannot be ex austed
directly to t e atmosp ere. Connect piping or
tubing to valve according to markings on valve
body. Refer to flow diagrams in OPERATION
section.
CAUTION: To avoid damage or accidental
disengagement of cartridge assembly from valve
body, hold cartridge assembly securely by
wrenching flats when installing or removing
piping at Port EB
50-60 Hanover Road, Florham Park, New Jersey 07 32
ASCO Valves
Page 2 of 4 Form No.V6865R1
Apply pipe compound sparingly to male pipe
t reads only. If applied to valve t reads, t e
compound may enter t e valve and cause operaĆ
tional difficulty. Avoid pipe strain by properly
supporting and aligning piping. W en tig tening
t e pipe, do not use valve or solenoid as a lever.
Locate wrenc es applied to valve body or piping as
close as possible to connection point.
To insure proper operation of t e valve, t e
pressure and ex aust lines must be full area
wit out restriction. A minimum differential
pressure (10 psi), as stamped on t e nameplate,
must be maintained between pressure and ex aust
at t e moment of s ifting. Air reservoirs must ave
adequate capacity to maintain t is minimum
pressure during s ifting. To c eck pressure during
s ifting, install a pressure gauge in t e pressure
piping as close to t e valve as possible.
IMPORTANT: These solenoid valves are intended
for use on clean dry air or inert gas, filtered to 50
micrometres or better The dew point of the media
should be at least 10C (18F) below the minimum
temperature to which any portion of the clean
air/inert gas system could be exposed to prevent
freezing If lubricated air is used, the lubricants
must be compatible with Buna N elastomers
Diester oils may cause operational problems
Instrument air in compliance with ANSI/ISA
Standard S7 3-1975 (R1981) exceeds the above
requirements and is, therefore, an acceptable
media for these valves
Flow Controls (Speed or Metering Devices)
Flow control valves may be added to control
cylinder speed. If used, t ese flow control valves
must be located in cylinder piping between t e
solenoid valve and t e cylinder.
IMPORTANT: Do not install flow controls (speed
or metering devices) or any type of restrictive
device in either the Pressure P (inlet) or the Main
Exhaust EA or Pilot Exhaust EB (outlet) ports of
the valve Restricting any of these lines may cause
valve malfunction
Indicates location
of pressure gauge
Indicates location
of filter
Indicates location
of metering device
IMPORTANT
A minimum operating pressure
differential of 10 PSI must
be maintained during shifting.
Press.
P
Cyl.
A
Cyl.
B
Exh.
EA
Exh.
EB Full size piping without
restrictions must be
used on pressure and
exhaust lines.
Solenoid
EA
AB
EB
Figure 2. Series 8345 piping diagram.
MAINTENANCE
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
NOTE: It is not necessary to remove t e valve
body from t e pipeline for repairs. However,
piping or tubing must be removed from Pressure P
and Ex aust EB ports.
Cleaning
All solenoid valves s ould be cleaned periodically.
T e time between cleanings will vary depending on
t e medium and service conditions. In general, if
t e voltage to t e coil is correct, sluggis valve
operation, excessive noise or leakage will indicate
t at cleaning is required. In t e extreme case,
faulty valve operation will occur and t e valve may
fail to s ift. Clean filter w en cleaning t e valve.
50-60 Hanover Road, Florham Park, New Jersey 07 32
ASCO Valves
Page 3 of 4Form No.V6865R1
Preventive Maintenance
Keep t e medium flowing t roug t e valve as
free from dirt and foreign material as possible.
W ile in service, t e valve s ould be operated at
least once a mont to insure proper opening and
closing.
Depending on t e medium and service
condition, periodic inspection of internal valve
parts for damage or excessive wear is
recommended. T oroug ly clean all parts. If
parts are worn or damaged, install a complete
ASCO Rebuild Kit.
Causes of Improper Operation
Incorrect Pressure: C eck valve pressure.
Pressure to valve must be wit in range specified
on nameplate.
Excessive Leakage: Disassemble valve and
install a complete ASCO Rebuild Kit.
Valve Disassembly
1. Disassemble valve in an orderly fas ion using
exploded view for identification and placement
of parts. Refer to Figure 3 on page 4 of 4.
2. Remove piping from Pressure P and Ex aust
EB ports.
3. Remove solenoid, see separate instructions.
4. Unscrew cartridge assembly from valve body.
T en remove cartridge gasket from valve body
and orifice gasket from base of cartridge
assembly.
5. Unscrew end cap and remove end cap gasket,
body gasket, and disc from valve body cavity.
6. Unscrew end plug and remove end plug gasket
and piston wit piston u-cup from valve body
cavity.
7. Clean valve and install a complete ASCO
Rebuild Kit.
Valve Reassembly
1. Lubricate piston u-cup and all gaskets wit
DOW CORNING 111 Compound lubricant
or an equivalent ig -grade silicone grease.
2. Position piston u-cup on piston wit mout or
open end facing outward, in t e direction of t e
end plug.
3. Install end plug gasket on end plug.
4. Install piston wit u-cup, end plug gasket, and
end plug into t e valve body. Torque end plug
to 200 ± 10 in-lbs [22,6 ± 1,1 Nm].
5. Install end cap gasket on end cap. T en posiĆ
tion body gasket and disc in valve body cavity
and install t e end cap wit t e end cap gasket.
Torque end cap to 200 ± 10 in-lbs [22,6 ± 1,1
Nm].
6. Position cartridge gasket in valve body.
7. Install orifice gasket in recess in base of
cartridge assembly.
8. T read cartridge assembly wit orifice gasket
into valve body. Torque cartridge assembly to
175 ± 25 in-lbs [19,8 ± 2,8 Nm].
9. Install solenoid see separate instructions.
10. Make up piping to pressure P and pilot ex aust
EB ports and electrical connection to solenoid.
WARNING: To prevent the possibility of
personal injury or property damage, check valve
for proper operation before returning to service
Also perform internal seat and external leakage
tests with a nonhazardous, noncombustible fluid
11. Restore line pressure and electrical power supĆ
ply to valve.
12. After maintenance is completed, operate t e
valve a few times to be sure of proper
operation.
ORDERING INFORMATION
FOR ASCO REBUILD KITS
Parts marked wit an asterisk (*) in t e exploded
view are supplied in Rebuild Kits. W en Ordering
Rebuild Kits for ASCO valves, order t e Rebuild
Kit number stamped on t e valve nameplate. If t e
number of t e kit is not visible, order by indicating
t e number of kits required, and t e Catalog
Number and Serial Number of t e valve(s) for
w ic t ey are intended.
50-60 Hanover Road, Florham Park, New Jersey 07 32
ASCO Valves
Page 4 of 4 Form No.V6865R1
Torque Chart
Part Name Torque Value In-lbs Torque Value Nm
Cartridge Assembly 175 ± 25 1 ,8 ± 2,8
End Plug
200±10
226±11
End Cap 200 ± 10 22,6 ± 1,1
cartridge assembly
orifice gasket
valve body
cartridge gasket
Indicates parts
supplied in
Rebuild Kit
1/8 NPT
wrenching flat
(See instructions in
Piping section)
end cap
end cap gasket
body gasket
disc
piston piston u-cup
(mouth or open end
to face end plug)
end plug gasket
end plug
Figure 3. Series 8345 without solenoid.
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