Emerson Keystone K-LOK 360 Series Replacement Instructions

Keystone K-LOK
®
Figure 360/362 and 370/372
seat replacement instructions:
K-LOK series 360/362 - Asme 150
K-LOK series 370/372 - Asme 300
PtFe, RtFe and uHMWPe seats
Caution
Always use the cardboard or brass shims to protect the valve body, disc, flange and sealing surfaces
from damage. Failure to do so may result in serious damage to the valve.
1. Remove the socket head screws which secure the flange locator plates on the wafer-style
valves, the retaining clips on lug-style valves, or the seat retaining ring on bi-directional dead-
end service valves.
2. Remove the flange bolt guides or retaining clips.
3. Remove the seat retainer ring. Do not gouge or leave a raised edge on the seat retainer ring.
4. Remove the seat and if applicable the body seat retainer ring gasket.
5. check and clean the disc edge and seat pocket. if the disc edge is damaged, contact the factory
for a disc replacement assembly. make certain that all gasket and sealing surfaces are clean
and undamaged. Remove any gasket material that may have adhered to the mating body
surfaces.
6. close the disc. make sure the disc is centered in relation to the body waterway bore. if it is not
centered, contact the factory. Be sure to position the disc against the disc position stop located
in the valve body.
7. With the disc in the closed position, install the new seat and external gasket. Refer to figure 1
for proper orientation.
note
installing a seat in a valve that has been modified for Bi-directional Dead end service:
to allow the seat retainer ring dead end service bolts to pass through the gasket,
modify the seat retainer ring gasket by following these steps:
a. use the dead end service seat retainer ring to layout the bolt hole pattern.
b. using a hole punch, make the required holes in the gasket.
Caution
The standard seat retainer screws only provide enough force to hold the seat retainer ring for shipment
and installation. If cycling or testing of the valve is required prior to installation, the seat retainer must
be pressed into the seat to prevent damage to the seat or leakage past the seat.
8. install the seat-retaining ring using the flange bolt guide or retaining clips to align the ring with
the body.
9. install and tighten the socket head screws.
10. When pressing the seat retainer into the seat and body, use c-clamps. the number of
c-clamps used should equal half the number of flange bolts of the valve. for instance, if the
valve has 12 flange bolts, 6 c-clamps should be used. to press the seat retainer ring with
the c-clamps, place the c-clamps around the valve assembly to allow an even load to be
applied all around the seat retainer ring. tighten until the seat retainer gasket is compressed.
After the gasket is compressed by the c-clamps, complete the tightening of the socket head
screws.
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