Double Flanged – Fig 631 PN10 & 16
Repair and Maintenance Instructions
Complete assembly and disassembly instructions
for 100-500mm F631 PN10 & PN16 valves.
Safety Precautions
Disassembly Instructions
Whenever a valve is being installed or
removed from the pipeline, ensure the
line is not pressurised and any
hazardous medium is drained away.
Before carrying out any maintenance
where the valves are either
pnuematically or electrically actuated
be sure to close/isolate the air supply
and exhaust the pressure to the
actuator OR ensure the electrical
supply is disconnected by authorised
personnel.
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Maintenance
Routine maintenance or lubrication are
not required.
Removal Instructions
Turn the disc (2) to the 5°open position.
Remove the actuator from the valve, if you have not already done so.
Remove disc screws (8).
Remove circlip (14), body plug (13) and plug O-ring (12) from the shaft (3) at
the opposite end to the actuator end of shaft.
5. Remove shaft bush (10) and shaft seal (11) from actuator end of shaft.
6. Extract shaft carefully, ensuring not to scrape shaft against the shaft bore.
Note position of keyway in relation to the actuator.
7. Twist disc (2) to the fully open position then roll the disc out of the seat,
ensuring not to damage the disc edge.
8. Collapse seat (4) to the centre of the valve bore at the O-ring housing spigots
(shaft holes) and gently lever one side of the seat from the flange face, then
pull through when the seat is clear of the bed groove. Do not use any sharp
tools to aid removal of seat.
9. Remove upper and lower bearings for inspection (PN16 valves only).
10. Thoroughly clean all components and examine them for excessive wear or
damage.
It is recommended that all ‘O’-rings be replaced and all seats, bushes,
plugs etc. are free from damage burrs etc.
If it is necessary to replace
components, the valve must be
removed from the pipe.
1. Partially open valve (5°open).
2. Disconnect any power supplies.
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3. Remove flange bolts.
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4. Spread flanges and remove valve.
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A.C.N. 000922690
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© Copyright by Keystone International Inc.
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F631Sml R&M/11/96
Keystone reserves the right to change product designs and specifications without notice.
Double Flanged – Fig 631 PN10 & 16
Repair and Maintenance Instructions
Assembly Instructions
1. Check all components are clean and free of damage.
2. Fit seat insert O-rings (6) into seat inserts (5) encapsulated in the seat (300 to
500 only).
3. Collapse the seat (4) and push into the bore of the valve, aligning the seat
inserts (5) with the shaft bore.
Ensuring O-rings are still in position, locate spigot in shaft bore at the hub end,
then gently push seat (4) into bedgroove simultaneously on both sides, working
your way up to the top shaft bore. Then ensure the remaining spigot is correctly
positioned. Inspect the seat (4) to ensure that it is sitting evenly in the
bedgroove and apply pressure with thumbs at the spigots to ensure correct fit
and that the seat is sitting evenly on the flange face.
4. Fit shaft bearing (15), shaft seal (11) and shaft bush (10).
5. Insert the shaft (3) into the neck of the valve and stop prior to entering the valve
bore.
6. Roll disc (2) into the seat leading with the disc edge (ensuring not to damage
the edge) with the disc screw holes closest to the neck of the valve, then twist
disc until the shaft holes are aligned.
7. Push shaft (3) downwards through the disc (2) into the hub of the valve until the
disc screw holes are aligned counterbore side towards the disc. A twisting
motion while pushing down will aid with smooth insertion.
8. Insert disc screws (8) with their O-ring and tighten to 16 Nm.
9. Push body plug (13) and plug O-ring (12) into position at the hub end of the
valve shaft bore and lock into position with the circlip (14).
10. Slowly actuate valve to ensure all components are free and correctly aligned.
11. Assembly is now complete and the valve is ready for installation or storage.
Refer to F631 Installation Instructions for details.
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© Copyright by Keystone International Inc.
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4
F631Sml R&M/11/96
Keystone reserves the right to change product designs and specifications without notice.
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