Patent ID: 8201574

Claim:
A method to manufacture a valve assembly, the method comprising: disposing a static seat holder having a first tapered surface in a housing, the housing having a passage formed therethrough; disposing a first seat having a second tapered surface in the housing adjacent to the seat holder such that the second tapered surface of the first seat is adjacent to for making contact with the first tapered surface of the seat holder; disposing a valve ball having a through hole formed therein in the housing adjacent to the first seat, wherein the first seat is biased towards the valve ball, wherein the valve ball is rotatable within the housing between an open position that has the through hole aligned with the passage and a closed position that has the through hole misaligned with the passage; and disposing a biasing mechanism, at least partially, within a groove formed within the seat holder such that the biasing mechanism biases the first seat towards the valve ball.