由阀座、阀板、密土封圈、铰链四部分构成。仅用于单向水流的圆形和方形出水口，结构严密，工作可靠，无需人力操作启闭力来自水源压力，当拍门内的水压大于拍门外侧压力则开启；反之则关闭。

It consists of four parts: valve seat, valve plate, dense soil sealing ring and hinge. It is only used for circular and square outflow of unidirectional flow. It has strict structure and reliable work. It does not require human operation to come from the pressure of water source. When the water pressure in the door is greater than the pressure outside the door, it is turned on; conversely, it is closed.

拍门性能：适用介质：水，河水，江水，海水，生活，工业污水

Performance: suitable medium: water, river water, river water, sea water, life, industrial sewage.

适用范围：适用于水利系统、市政污水、城市防洪排涝、污水处理厂、自来水厂等。

Scope of application: applicable to water conservancy system, municipal sewage, urban flood control and drainage, sewage treatment plants, water works, etc.

产品规格和类别：拍门规格分圆形拍门和方形拍门两种，可根据出水口大小形状设计生产；拍门类别可分别为空心浮板式拍门和平板式拍门。

Product specifications and categories: the gate specifications are divided into two kinds of circular pat doors and square pat doors, which can be designed and produced according to the size and shape of the outlet.

拍门安装：拍门安装可采用以下方式：法兰连接，混凝土浇筑。拍门中心与流道中心允许偏差不应大于3.0 mm拍门四周应留有400 mm的安装空间，拍门出口下方做成1：5的斜坡。

Flap door installation: flap door installation can adopt the following ways: flange connection, concrete pouring. The allowable deviation between the center of the flap and the center of the runner should not be greater than 3 mm. There should be 400 mm installation space around the flap door and a slope of 1:5 under the flap exit.

拍门安装的配件：螺栓或膨胀丝采用不锈钢或经过防腐处理的碳钢；密封件采用橡胶或橡胶垫片。

Accessories for racket door installation: bolts or expansion wires are made of stainless steel or corrosion-resistant carbon steel; rubber or rubber gaskets are used for seals.