6
KEYSTONE
K-LOK SERIES H HIGH PERFORMANCE BUTTERFLY VALVES
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
Installing the bottom cover
(DN 700-900 / NPS 28-36)
1. Place the bottom cover gasket (20) on the
bottom cover (21).
2. Align the bottom cover plate (21) with the
body (1) bottom surface. Make sure the
bottom cover gasket remains in alignment
with the bottom cover plate gasket groove.
3. Place the four bolts and washers (22,23) and
tighten the bolts.
Installing the seat assembly
1. Check to make sure the disc (2) is in the
closed position.
2. Make sure the disc is centered in relation to
the body seat pocket.
3. Place the seat assembly (13) and the seat
retaining ring gasket (14) in the valve
body (1). Ensure the disc is closed against
the disc stop.
Note:
metal and fire safe seat assemblies have
2 gaskets. Fire safe seat assembly has an extra
back up ring, see Figure 10 (light grey).
FIGURE 7
Wire wrapped seat
FIGURE 6
General service seat
FIGURE 8
Elastomer seat
FIGURE 9
Metal seat
FIGURE 10
Fire safe seat
Note:
elastomer seats have a backup ring
(Figure 8, blue part). Make sure that the spilt
of the backup ring is in line with the shaft
direction.
Note:
make sure the seats are positioned as
shown in Figures 6 - 10.
4. Place the seat retaining ring (15) on top
of the seat retaining gasket (14) and seat
assembly (13).
5. Place and tighten the retaining ring bolts
(16) and nuts (19, wafer). For lugged valves
cross tighten the bolts.
CAUTION
The seat retaining bolts for the wafer type
valves provide only enough force to hold the
seat retaining ring for shipment and installation.
If valve actuation is required before installation,
press the seat retainer into the seat to prevent
damage to the valve seat before actuation.
