Patent ID: 7650901

Claim:
A gas shutoff valve comprising: a valve body; a base portion of the valve body; a gas entry port in the valve body; a gas exit port in the valve body; a second seat residing over the gas exit port; a ball residing in the valve body having a diameter suitable to residing in the second seat to block a flow of gas into the exit port; a seating ball residing in a ball recess in the base portion, the seating ball residing under the ball; an upward facing first seat on an upper surface of the seating ball, wherein the first seat is configured to retain the ball when the valve experiences motion below an earthquake threshold and to allow the ball to escape when the valve experiences motion above the earthquake threshold; a tool mouth in the seating ball; and a tool port in the base portion sufficiently aligned with the tool mouth to allow a leveling tool to be inserted through the tool port and into the tool mouth for adjusting the seating ball.