拍门：安装于排水管道的尾端，具有防止外水倒灌功能的逆止阀。拍门主要由阀座、阀板、密土封圈、铰链四部分构成。形状分为圆形和方形。拍门的材质传统上为各种金属制品，现在已经发展为多种复合材料。

Pat door: installed at the end of the drainage pipe, with a reverse check valve to prevent the function of external water pouring. The door is mainly composed of four parts, the valve seat, the valve plate, the sealing ring of the dense soil and the hinge. The shape is divided into round and square. The material of the door is traditionally a variety of metal products, and it has now developed into a variety of composite materials.

拍门相对传统的闸门有以下几点优势：

The gate has the following advantages relative to the traditional gate:

1.更具节能性（如开关门无需人工施加外力）

1. is more energy-efficient (such as closing the door without exerting external force)

2.使用寿命长（机械结构简单，维护方便）

2. long service life (simple mechanical structure, convenient maintenance)

3.方便使用（开关无需人人工操作）

3. easy to use (switch without human manual operation)