5
4 MAINTENANCE BUTTERFLY VALVES
OPTISEAL FIG. 14/16 AND BREWSEAL
The Keystone butterfly valves OptiSeal Fig.
14/16 and BrewSeal are designed to require
a minimum of maintenance.
WARNING!
Depressurize and, if necessary in case of
dangerous fluids, drain the line and flush with
appropriate cleaning fluid before starting any
maintenance. Failure to do so may cause serious
personal injury and/or equipment damage.
Before disassembling the valve, ensure the valve
has been decontaminated correctly from any
harmful gasses or liquids and that it is within
a safe temperature range for handling.
Personnel making any adjustments to the valves
should utilize suitable equipment. All required
personal protection means should be worn.
We recommend that personnel should be trained
in all aspects of these instructions before carrying
out handling of any valve.
4.1 Routine maintenance
The Keystone OptiSeal Fig. 14/16 and BrewSeal
butterfly valves are designed to require
a minimum of maintenance.
Routine maintenance or lubrication is not
required, we recommend periodic (visual)
inspection to ensure satisfactory operation and
sealing to the environment.
4.2 Removing the valve from the pipe system
1. Turn the disc to nearly closed position.
(The disc is in line with the parallel flats
in the stem).
2. Loosen all flange bolts and remove the
bolts, which prevent removing of the valve.
3. Spread the flanges with adequate tooling,
and remove the valve.
4.3 Valve disassembly (see sketch)
1. Turn the disc to almost open position.
2. Remove actuator.
3. Remove the body screws.
4. Remove the lower part of the body. This is
more or less held by the rectangular shaped
seat lip and groove. Use two screwdrivers in
the body-splits to separate the body halves
and pull the bottom-part off with a rotating
motion.
3.6 TROUBLESHOOTING GUIDE
Symptom
Possible cause
Resolution
Valve would not rotate
1. Actuator has failed
1. Replace or repair
2. Valve packed with debris
2. Flush or clean valve to remove debris
Valve leaking
1. Valve not fully closed
1. Close valve
2. Debris trapped in valve
1. Cycle and flush (with valve open) to remove debris
3. Seat is damaged
2. Replace seat
Jerky operation
1. Extreme dry application
1. Put some silicon oil on seat or increase size of actuator
2. Air supply actuator inadequate
2. Increase air supply pressure and/or volume
KEYSTONE
OPTISEAL F14/16 - 15/17 AND BREWSEAL BUTTERFLY VALVES
INSTALLATION AND MAINTENANCE INSTRUCTIONS
5. Pull the disc stem and seat out of the body
top part.
6. To remove the disc stem from the seat,
deform the seat into a long ‘oval’ sufficient
to clear the end of the short stem, move the
short stem-end out off the seat bore, and
pull the long end from the seat stem hole,
using a rotating motion.
7. The body top part contains a top bushing
and dirt scraper. Generally there is no need
to remove these parts.
8. For some versions of the OptiSeal only,
the bodies are equipped with bearings. If
required these can be removed.
4.4 Valve assembly (see sketch)
1. Clean all parts. Use silicone grease on
the disc stem to facilitate the assembly.
If the valve has to be provided with
a TFE-lined-seat preheat this seat during
half an hour in nearly boiling water
before assembly.
2. If removed before, re-assemble the top
(shaft)-bushing in the body upper part.
3. For some versions of the OptiSeal, mount
the two shaft bearings and split seals.
4. Take the disc stem and insert the long
stem-end into a hole of the seat, using
a twisting motion.
5. Deform the seat into a long ‘oval’ sufficient
to clear the end of the short stem. With the
disc stem simulating an open position,
move the short stem-end into the elongated
seat-bore and assemble the short stem-end
into the other seat stem-hole by releasing
the distorted seat. Do not put oil or grease
between body and seat.
6. Push the long stem-end of the disc stem/
seat unit into the body top part. Push the
seat with seat lip and groove in place.
7. Assemble the bottom part of the body.
Take care of the positioning of the bottom
part. The little rectangular cast on indicator
near the body split should correspond to
the indication on the bottom part. Install the
body screws and tighten securely. Take care
that the body parts are aligned securely.
8. Assemble the dirt scraper.
9. Mount the actuation.
4.5 Re-installing the valve
See section 3.3.1
Содержание KEYSTONE OPTISEAL F14
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