Patent ID: 6474622
Filing Date: 2002-11-05
Classification: F16K

Abstract:
A pendulum gate valve comprising:a valve housing including an interior space and first and second openings opposite to each other; a valve seat disposed in the interior space around the edge of the first opening; a valve disk mounted relative to the valve housing so that the valve disk is movable within the interior space between a completely opened position and a completely closed position, the valve disk being constructed so that when the valve disk is moved to the closed position the valve disk engages the valve seat and seals the first opening; a pivot arm, the base end of which is pivotally secured to the valve housing; an arm driving device for moving a tip end of the pivot arm between a first position where the valve disk is in the completely opened position and a second position where the valve disk is in the completely closed position; and a power transmission device for transmitting the movement of the pivot arm to the valve disk; the power transmission device having a first roller guide groove formed on the valve disk, a valve disk support fixed to the tip end of the pivot arm, movable relative to the valve disk, a second roller guide groove formed on the valve disk support so as to face to the first roller guide groove, a third roller guide groove formed on the valve disk support, a supporting plate, a fourth roller guide groove formed on the supporting plate so as to face to the third roller guide groove, a first roller engaging with the first and second roller guide grooves, and a second roller engaging with the third and fourth roller guide grooves, each of the first and second roller guide grooves extending downwards obliquely so as to be separated from the valve disk, and each of the third and fourth roller guide grooves extending downwards obliquely so as to approach to the valve disk.