"How to fit a Wedge" in a Gate Valve. I understand it requires Feeler gauges to determine how much metal to remove, but I need details. Make sure the seat faces are properly lapped. Make sure the wedge surfaces are nicely lapped Place the wedge in the valve solidly down and against one of the seats. With feeler gauges determine the gap between the opposite seat and the wedge surface. Also determine the largest gap postion on the seat. Grind the seat face down by 0 on the place where you found the max gap and by the amount of max gap that you found 180 degrees from the position where you measured the max gap. By simply placing the wedge between the seats and using a valve stem you can tap the seat to get a contact mark which will give you an apprehension of the health of the valve.

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