4
KEYSTONE
K-LOK SERIES H HIGH PERFORMANCE BUTTERFLY VALVES
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
Removing the seat retainer gasket
Remove the seat retainer gasket (14). Use a
powered wire brush tool to remove the gasket
material that may have adhered to the mating
body surfaces.
Removing the seat assembly
To remove the seat assembly, treat the seat
(13) and its associated components as a single
assembly by removing the total seat assembly
at once.
Removing the shaft packing (9) with shaft (3)
in body (1)
Two screws with a diameter not greater than
8 mm (¼") and a length of at least 150 mm (6”)
are required. The most commonly used screws
are 'drywall screws'. Using the screws, grab
and remove each packing ring, one at the time.
Removing the shaft packing (9) with shaft
removed from body
Use a hook-type tool to grab and remove each
packing ring, one at the time.
Removing the flanged shaft bearings
Use a driving punch and place it against the
end of the flanged bearing (6). Gently tap with a
hammer on the other side of the driving punch
to remove the bearing.
3. As the valve body moves away from the vice,
the upper shaft is removed from the upper
disc hub.
4. Continue to reposition the valve body with
the vice so as to allow removal of upper
shaft (3).
WARNING
Prevent the body from falling by holding the body
by hand (DN 50-100 / NPS 2-4) or by using proper
hoisting equipment. Failure to do so may result in
personal injury or damage to equipment.
Removing the lower shaft and disc
1. Take a slide hammer puller and screw it
in the threaded hole of the bottom shaft (4)
(For DN 700-900 / NPS 28-36 enter the
bottom shaft on bottom cover side).
2. Gently pull the slide hammer to pull out the
bottom shaft, see Figure 4.
Removing the upper shaft
CAUTION
Throughout this operation, make sure the disc
edges remain protected from contact with the
body by installing cardboard at all disc hub areas.
Failure to do so may cause damage to the disc
sealing edge. Protect the shaft from the vice teeth
to prevent damage and to eliminate potential
packing leakage.
1. When removing the upper shaft (3) from the
disc (2), clamp the vice jaws on to the upper
shaft area above the valve body (1) top plate.
2. Once the vice jaws are secure against
the upper shaft, drive the wedge-shaped
chisel/punch between the valve body top
plate and the vice, see Figure 3.
Removing the bottom cover
(only DN 700-900 / NPS 28-36)
To disassemble the bottom cover assembly,
remove the following components:
• bottom cover (21)
• washers (22)
• bottom cover gasket (20)
• bolts (23)
Removing the packing gland assembly
1. Unthread the nuts (19) from the packing
bridge bolts (17).
2. Remove the gland bridge (12).
FIGURE 3
Removal of upper shaft
FIGURE 4
Removal of lower shaft
WARNING
When placing the valve into the vice, make sure
the wedged end of the pin faces the assembler.
Hold the punch with a punch holder or a pair of
vice grips. Otherwise, serious injury may occur.
CAUTION
Physically hold the disc to prevent the disc from
falling and becoming damaged during removal.
When both the upper shaft and lower shaft are
removed from the disc, the disc is unsupported!
WARNING
Smaller discs may be removed by hand
(DN 50-200 / NPS 2-8). Remove larger discs with
proper hoisting equipment. Failure to do so may
result in personal injury or damage to equipment.
Removing the seat retainer ring
Preferably place the valve in horizontal position
with the retaining ring (15) facing upwards.
Remove the seat retainer ring by removing the
bolts (16) and nuts (19), in case of a wafer type
valve).
WARNING
Prevent the retaining ring from falling by holding
the ring by hand (DN 50-200 / NPS 2-8) or by using
proper hoisting equipment. Failure to do so may
result in personal injury or damage to equipment.
