Seepex BN 5-12 Series, Operation & Maintenance Manual

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©ASCO Valve, Inc.® 50 Hanover Road, Florham Park, New Jersey 07932 www.ascovalve.com
I&M No. V 5847 R2
Preventive Maintenance
•
Keep the medium fl owing through the valve as free from dirt and
foreign material as possible.
•
While in service, the valve should be operated at least once a
month to insure proper opening and closing.
•
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
•
Incorrect Pressure: Check valve pressure. Pressure to valve
must be within range specifi ed on nameplate.
•
Excessive Leakage: Disassemble valve and clean all parts. If
parts are worn or damaged, install a complete ASCO Rebuild Kit.
Coil Replacement (See separate solenoid instructions)
Valve Disassembly (Refer to Figure 1)
1.
Remove solenoid - see separate solenoid instructions.
2. Unscrew solenoid base sub-assembly and remove bonnet gasket.
3. Remove valve bonnet screws (4) and valve bonnet.
4. For normal maintenance, it is not necessary to disassemble
the manual operator (optional feature) unless external leakage
is evident. To disassemble, remove stem pin, manual operator
stem, stem spring and stem gasket.
5. Remove core spring, core/diaphragm sub-assembly and body
gasket.
6. All parts are now accessible for cleaning or replacement. Replace
worn or damaged parts with a complete Spare Parts Kit for best
results.
Valve Reassembly
1. Reassemble in reverse order of disassembly paying careful
attention to exploded views provided for identifi cation and
placement of parts.
2. Lubricate body gasket and solenoid base gasket with DOW
CORNING
®
200 fl uid lubricant or an equivalent high-grade
silicone fl uid. Lubricate manual operator stem gasket with DOW
CORNING
® 111 Compound lubricant or an equivalent high-
grade silicone grease. On oxygen valves Suffi x “N” and special
cleaning valves where silicone lubricants are not allowed use
FLOROLUBE
® GR-362 , LG-160 or KRYTOX ® GPL -226.
Note: Only the gaskets specifi ed above should be lubricated.
3. Replace body gasket and core/diaphragm sub-assembly. Locate
the bleed hole in core/diaphragm sub-assem bly approximately
45° from the valve outlet.
4. Replace valve bonnet and bonnet screws (4). Torque bonnet
screws (4) in a crisscross manner to 110±10 inch pounds.
5. If removed, replace manual operator stem, stem spring, stem
gasket and stem pin.
6. Replace bonnet gasket, core assembly and core spring. For
valves with manual operator, replace core spring with wide end
in core fi rst; closed end protrudes from top of core.
7. Replace solenoid base sub-assembly and torque to 175±25 inch
pounds.
8. Replace solenoid enclosure and retaining cap or clip.
9. 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 for ASCO Valves,
order the Rebuild Kit number stamped on the valve nameplate. If the
number of the kit is not visible, order by indicating the number of kits
required, and the Catalog Number and Serial Number of the valve(s)
for which they are intended.
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