Installation & Maintenance Instructions
SERIES
2-WAY REMOTE PILOT-OPERATED VALVES
8353
NORMALLY CLOSED OPERATION Ċ QUICK OPENING Ċ HIGH FLOW
3/4I, 1I, OR 1½I, INTEGRAL COMPRESSION FITTINGS Form No.V6672R2
DESCRIPTION
Series 8353 valves are 2-way normally closed, diaphragm type air valves designed for remote pilot operation. The valves have an angle type aluminum body with a 1/8I NPT connection in the valve bonnet for connection to the ASCO remote pilot valve. These valves are designed for multiunit installations with separately mounted ASCO pilot valves.
OPERATION
When the remote pilot valve opens, pressure above the main diaphragm is released allowing main line pressure to act against the underside of the diaphragm, opening the main valve orifice. When pilot valve closes, main line pressure bleeds to the top of the diaphragm and closes the main orifice.
S Minimum operating pressure 5 psi.
S Maximum operating pressure 125 psi.
INSTALLATION
Check valve bonnet for correct catalog number, pressure, and service. Never apply incompatible fluids or exceed pressure rating of the valve. Installation and valve mainteĆ nance 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.
Positioning
Valve may be mounted in any position.
Piping to Integral Compression Fittings
Connect piping to valve according to marking on valve body.
Pipe nipples must be free of rust, burrs, and cutting oil.
Disassemble compression fittings and position retaining nut, gasket, and retainer on piping. Be sure beveled edge of gasket faces valve body. Piping must be squarely in line with valve inlet and outlet ports. Avoid pipe strain by properly supporting and aligning piping.
CAUTION: Anchor pipes securely to avoid separation from valve body.
When making connection, do not use valve as a lever.
Tighten retaining nuts sufficiently to prevent external leakage.
CAUTION: To avoid damage to valve body, do not overtighten retaining nut. The retaining nut has a gasket seal and does not require excessive turning to seal pipe connections.
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Piping / Tubing to 1/8IĂNPT Connection
Connect piping or tubing to 1/8I NPT connection in valve bonnet. 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 pipe, do not use valve as a lever. Wrenches applied to valve body or piping must be located as close as possible to connection point. Mount the remote ASCO pilot valve as closely as possible to the main valve. Consult authorized ASCO representative or factory for recomĆ mended pilot valve. Connecting tubing lengths of ten feet or less have little effect on the response time. Installations with over ten feet of tubing must be tested under actual operating conditions. Tubing with ¼I O.D. is recomĆ mended for all installations.
IMPORTANT: For the protection of the valve, install a strainer or filter suitable for the service involved in the inlet side as close to the valve as possible. Periodic cleaning is reĆ quired, depending on the service conditions. See Series
8600, 8601 and 8602 for strainers.
MAINTENANCE
WARNING: To prevent the possibility of personal injury or property damage, 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 cleaning or rebuilding. However, tubing or piping from the remote pilot valve must be disconnected from the main valve bonnet.
Cleaning
All solenoid valves should be cleaned periodically. The time between cleanings will vary depending on the medium and service conditions. In general, 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
S Keep the medium flowing through the valve as free from dirt and foreign material as possible.
S While in service, the valve should be operated at least once a month to ensure proper opening and closing.
S 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.
Page 1 of 4 e
ASCO Valves
50-60 Hanover Road, Florham Park, New Jersey 07932
Causes of Improper Operation
S Incorrect Pressure: Check valve pressure. Pressure to valve must be within 5 - 125 psi.
S Excessive Leakage: Disassemble valve and clean all parts. Replace parts that are worn or damaged with a complete ASCO Rebuild Kit for best results.
S Failure to Open or Close:
-If diaphragm valve stays open, bleed hole may be clogged. If diaphragm valve stays closed, diaphragm may be torn. Install a complete ASCO Rebuild Kit.
-Failure of the remote pilot solenoid valve can also cause the diaphragm valve to stay closed or open.
Inspect remote pilot solenoid valve for proper opening and closing.
-Incorrect pipe size or excessive run (see
INSTALLATION).
Valve Disassembly and Reassembly for ¾I or 1I
Construction
1. Disassemble valve in an orderly fashion. Use exploded view in Figure 1 on page 3 for identification and placement of parts.
2. Disconnect tubing or piping from valve bonnet.
3. Remove bonnet screws, valve bonnet and diaphragm assembly from valve body.
4. Diaphragm assembly is now accessible for cleaning or replacement. Clean valve body and replace diaphragm assembly if worn or damaged.
5. Install diaphragm assembly with marking THIS SIDE
OUT facing valve bonnet. Be sure the bleed hole in diaphragm assembly is in alignment with cavity in valve body and bonnet. The external contours of the diaphragm assembly, body and bonnet must all be in alignment.
6. Replace valve bonnet and bonnet screws. Start bonnet screws by hand for proper engagement, then tighten screws in a crisscross manner to 95 ± 10 in-lbs [10,7 ±
1,1 Nm].
7. Make up piping or tubing from remote pilot valve to valve bonnet.
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.
8. Restore line pressure to valve.
9. After maintenance, operate the valve a few times to be sure of proper opening and closing.
Valve Disassembly and Reassembly for 1½I or
1½I Long Life Construction
1. Disassemble valve in an orderly fashion. Use exploded view in Figure 2 on page 4 for identification and placeĆ ment of parts.
2. Remove pilot bonnet screws, pilot valve bonnet and pilot diaphragm assembly.
3. Remove main bonnet screws and main valve bonnet from valve body. Then remove diaphragm spring (use on long life construction only) and main diaphragm asĆ sembly.
4. All parts are now accessible to clean or replace. If parts are worn or damaged, install a complete ASCO Rebuild
Kit.
5. Install main diaphragm assembly with marking THIS
SIDE OUT facing main valve bonnet. Be sure that bleed hole in diaphragm assembly is in alignment with cavity in valve body and bonnet. The external contours of the diaphragm assembly, body and bonnet must all be in alignment. For long life construction, install diaphragm spring in center of main diaphragm assembly.
6. Replace main valve bonnet and bonnet screws. Torque bonnet screws in a crisscross manner to 95 ± 10 in-lbs
[10,7 ± 1,1 Nm].
7. Install pilot diaphragm assembly with the bleed hole in alignment with the cavity in main valve bonnet. The exĆ ternal contours of the diaphragm assembly, main and pilot bonnets must all be in alignment.
8. Replace pilot valve bonnet and pilot bonnet screws.
Align bleed cavity in pilot valve bonnet over bleed hole in pilot diaphragm assembly. Torque pilot bonnet screws evenly to 95 ± 10 in-lbs [10,7 ± 1,1 Nm].
9. Make up piping or tubing from remote pilot valve to valve bonnet.
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.
10. Restore line pressure to valve.
11. After maintenance, operate the valve a few times to be sure of proper opening and closing.
ORDERING INFORMATION FOR
ASCO REBUILD KITS
Parts marked with an asterisk (*) in the exploded view are supplied in Rebuild Kits.
When Ordering Rebuild Kits,
Specify Catalog Number And Serial Number
Page 2 of 4
ASCO Valves
Form No.V6672R2
50-60 Hanover Road, Florham Park, New Jersey 07932
Part Name
Bonnet Screws
Torque Chart
Torque Value Inch-Pounds
95 ± 10
Torque Value Newton-Meters
10,7 ± 1,1 bonnet screw
Bleed hole in diaphragm assembly must be in alignment with cavity in valve body and valve bonnet.
valve bonnet diaphragm assembly
(marking THIS SIDE OUT" must face valve bonnet) valve body
NOTE: Beveled edge of gasket faces valve body.
gasket (2)
(See Note) retainer (2) retaining nut (2)
Indicates Parts Supplied
In ASCO Rebuild Kits
Figure 1. Series 8353 remote pilot-operated valve, ¾I and 1I construction.
Form No.V6672R2
ASCO Valves
Page 3 of 4
50-60 Hanover Road, Florham Park, New Jersey 07932
Part Name
Bonnet Screws
Indicates that these parts are included in rebuild kit
Bleed hole in pilot diaphragm assembly must be in alignment with cavity in pilot and main valve bonnet
Torque Chart
Torque Value Inch-Pounds
95 ± 10
Torque Value Newton-Meters
10,7 ± 1,1
1/8I NPT remote pilot connection pilot valve bonnet pilot diaphragm assembly bonnet screws (8) main valve bonnet
Bleed hole in main diaphragm must be in alignment with cavity in main valve bonnet and valve body.
diaphragm spring
(see note 2) marking THIS SIDE OUT" must face valve bonnet main diaphragm assembly
(see note 3) valve body gasket (2)
(see note 1) retainer (2) retaining nut (2)
Notes:
1.
2.
3.
Beveled edge of gasket to face valve body.
Diaphragm spring is not present on standard valve constructions.
Diaphragm configuration slightly different on standard valve construction.
Page 4 of 4
Figure 2. Series 8353 remote-pilot operated valve, 1½I long life construction.
Form No.V6672R2
ASCO Valves
50-60 Hanover Road, Florham Park, New Jersey 07932
