Patent ID: 6116575
Filing Date: 2000-09-12
Classification: F16K

Abstract:
A seat structure for a ball valve which is disposed at an inflow vent side and an outflow vent side of a valve body, comprising a seat means planted into a seat planting recess formed in a seat holder fixed into a safety recess formed in an inner periphery of the valve body, the seat means including a fixture portion fixed into the inner periphery of the valve body, the fixture portion including a bent deviation preventing portion which is inserted into a deviation preventing recess formed in the seat planting recess, and a ball contact which is to be contacted to a valve ball provided between the inflow vent side and the outflow vent side, a portion between the ball contact and the fixture portion being bent to form a convex portion or a concave portion, and a corresponding concave portion or a corresponding convex portion being formed at the seat planting recess of the seat holder to correspond to the convex portion or the concave portion.