| 摘要 |
A flapper valve assembly is disclosed which includes a valve element having a flange of elastic material formed intermediate of a flap portion and an actuating stem. The valve element is inserted through a lateral opening in a valve body with the flange disposed against a mounting surface which surrounds the lateral opening and with the flap portion opposing a valve seat in the valve body. The flange is clamped in place upon the mounting surface by a closure member which is secured to the valve body so that the flange seals the lateral opening in the valve body. The flange provides a flexible pivot for the movement of the flap portion toward and away from the valve seat in response to movement of the stem. The flange is formed normal to the flap portion and the mounting surface is inclined toward the valve seat so that the flap portion will be held away from the valve seat when the valve element is in a neutral position with the flange in a relaxed condition. A spring is connected to the stem to urge the flap portion against the valve seat thereby closing the valve. The valve is opened by moving the stem, against the force of the spring, so that the flap portion is pivoted from its closed position, through the neutral position and into a fully opened position.
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