Eight important steps to differentiate the seat sealing performance 1. Automated seal welding of Stellite 6 frontal seat 2. Seat seal welded submerged gas test 3. Re-extension of seat surfaces after seal welding 4. Use gauges and gaskets to determine the final seat angle to determine the desired wedge angle 5. Refine the seat surface to match the wedge angle 6. Wedge the valve seat surface overlap 7. Ideal distribution Fit the wedge, placed and lapped onto a suitable body 8. After assembly, the valve housing, seat, packing and back seat zero leak pressure test