Jordan Valve Mark 5108 Series Back Pressure Regulator - Manual (Page 4)

Procedure D: Seat Ring Replacement
NOTE: It is rare for a seat ring to require replacement.
Minor nicks and scratches in the seating surface can
usually be smoothed out with emery cloth.
1. Perform Steps 1 and 2 of Procedure B, above.
2. If you are working on a 4" or smaller valve, follow
Steps 3 thru 9, below.
3. If you are working on a 6" or larger valve, follow
Steps 10 thru 16, below.
4. Seat rings in valves 4" and smaller are threaded into
the valve body. To remove, you will need a special
seat ring tool. You may fabricate one using standard
pipe as shown in the sketch below, or one may be
purchased from Jordan Valve.
5. Using the seat ring tool, unthread the seat ring from
the body.
6. Remove the old O-ring from the counterbore in the
body.
7. Install the new O-ring in the counterbore.
8. Using the seat ring tool, install the new seat ring.
9. Reassemble the valve, following Steps 5 & 6 of
Procedure B.
10. Seat rings in valves 6" and larger are bolted into
the body with socket head capscrews. In addition
you will note that the seat ring is equipped with
additional threaded holes that may be used for
"jacking" the seat ring out of the body.
11. Remove the socket head capscrews.
12. Remove the old seat ring from the body by
temporarily installing two or more of the capscrews
in the "jacking" holes.
13. Install a new O-ring in the groove of the new seat
ring. Lubricate the O-ring and outer seat ring wall
with Vaseline® or similar lubricant.
14. Install the new seat ring in the body, making sure
that the capscew holes line up.
15. Replace and tighten all the capscrews.
16. Reassemble the valve, following Steps 5 and 6 of
Procedure B.
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