| 摘要 |
<p>A flap valve used for selectively closing an open-end of a material conduit. The flap valve is particularly adapted for use in high temperature installations such as at the discharge of a high temperature cyclone separator. The valve includes a shaft rotatably mounted in a fixture properly positioned relative to the conduit to be closed. The shaft includes a polygonal central section and a flap with a top surface adapted to close the open end of the conduit and one end of the flap lies atop the polygonal section of the shaft. The back of the flap is bent perpendicular to the top surface to overhang the shaft. A dog having a similarly shaped polygonal opening slides over the central section of the shaft and has a leg which lies atop the top surface of the flap. This dog serves to transmit rotational forces between the shaft and the flap while allowing relative movement between the shaft on the flap in a direction parallel to the shaft axis to permit relative thermal expansion. A typical counterweight is connected to the shaft to exert a rotational force on the shaft to tend to rotate the flap valve to a closed position. Material in the conduit exerts a force in the flap switch will tend to overcome the force of the counterweight to open the flap.</p> |
