Patent ID: 7814983
Filing Date: 2010-10-19
Classification: A62C,F16K,Y10T

Abstract:
1. A method of operating a dry pipe valve, the dry pipe valve having a body with a passage extending along a longitudinal axis between an inlet and an outlet, a member pivotable about an axis between a first position occluding a flow of fluid through the passage and a second position permitting the flow of fluid through the passage, the member having a first operative side and a second operative side, the method comprising: providing a seat body having a first and second seating surfaces offset to each other; applying a first fluid pressure to the first operative side having a first effective surface area and a second fluid pressure to the second operative side offset to the first effective surface area and having a second effective surface area less than five times the first effective surface area to inhibit fluid flow through the passage, the second operative side having a solid surface that extends from the first seating surface to the second seating surface; and changing one of the first and second fluid pressures so that the member pivots from the first position toward the second position to permit fluid flow through the passage.