Patent ID: 8813771

Claim:
A method for installing an annular seat ring into the body of a gate valve, the method comprising: providing a valve body having a seat pocket, the seat pocket having an annular shoulder sealing face and a plurality of recesses defined at the seat pocket; providing an annular seat ring comprising an annular seat face and an opposed annular flange sealing face and a plurality of recesses defined in the flange sealing face corresponding to and alignable with the plurality of recesses defined at the seat pocket; locating a dynamically-energized seal in an annular groove, the annular groove provided in one of: the flange sealing face and the shoulder sealing face; connecting a plurality of removable fasteners between the valve body and the seat ring, the fasteners located in the plurality of recesses in the seat pocket and the flange sealing face, to bring the flange sealing face of the seat ring to a mechanical stop on the shoulder sealing face of the seat pocket and to thereby provide a seating load which plastically and elastically compresses the dynamically-energized seal.