Asco 8345 Series Istruzioni per l'installazione e il funzionamento

Page 1 of 4

50-60 Hanover Road, Florham Park, New Jersey 07 32

ASCO Valves

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

BEAA

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: -4F to

+140F.

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 10C (18F) 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.

Cyl.

Exh.

EB Full size piping without

restrictions must be

used on pressure and

exhaust lines.

Solenoid

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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