Flap valve

Abstract

The invention relates to a flap valve comprising a flap valve seat (1) and a flap valve cover (2) hinged to the flap valve seat (1). The flap valve cover (2) is slantwise arranged on the flap valve seat (1); the lower end of the flap valve cover (2) is provided with a hinging end; a cavity (21) is disposed in the upper end of the flap valve cover (2); a weight balance device (3) is disposed in thecavity (21); the weight balance device (3) is supported by the bottom surface of the cavity (21); and the weight balance device (3) does not contact the top surface of the cavity (2). With the weightbalance device disposed in the cavity and the weight balance device has no contact with the top surface of the cavity, so upon water impact to the flap valve (when an impact height is equal to the lower edge of the flap valve), the weight of the weight balance device keeps the flap valve still; and no upward impact is caused to the flap valve cover, so ideal use effect can be achieved.

Description

technical field [0001] The invention relates to a flap door, which is a one-way valve device used in water supply and drainage projects to realize backstop and flow interruption. Background technique [0002] The flap door is a one-way valve installed on the coast of rivers or at the water outlet of the water supply and drainage system pipe. It is opened and closed by the pressure difference between the inside and outside of the flap door cover. , The flap door can be closed automatically, preventing tide water from entering the pipeline, and preventing backflow of sea, river and river water. When the tide comes ashore under the action of the wind, the water on the shore can flow into the river through the flap gate. The present flap door structure is made of flap door cover, flap door seat, and vertical elevation is 3 ~ 5 ° inclination angle, is beneficial to flap door tightly closed under the action of gravity. In actual use, when the impact force of tides and waves is l...

AI Technical Summary

Problems solved by technology

In addition, when the internal drainage is low, it is difficult to open the heavy flap door when the impact force of the water flow is low.

[0003] For this reason, someone arranges a cavity in the flap, and injects water into the cavity to increase the weight of the flap cover, so that when the flap is impacted (the impact height is at the lower edge of the flap), the water in the cavity will not only play a role In addition to the counterweight, the water in the cavity will also give an upward impact to the flapper cover, so after use, a large part of the gravity of the water is offset by the upward impact of the water on the flapper cover, so the actual distribution Heavy effect is not ideal

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