At present, there are many manufacturers of valves in China, including the more advanced knife gate valve. The designer should select the gate valve according to the needs of discharge flow and the general hydraulic calculation method. From the opening and closing mode, there are manual, manual, electric dual-purpose, electric, etc. For the currently produced valve gate, the general shell test pressure is 1.5PN, the sealing test pressure is 1.1PN, the medium is water, and the medium temperature is < 100 ℃.

附件选择

Attachment selection

应用闸阀作为放水设备，其本身不能直接安装，需要与闸阀配套的钢管和法兰盘。钢管可自行设计和加工，其钢管壁厚应根据使用年限来决定。从实践中看，用钢板焊接的钢管壁厚不应小于10mm，使用铸钢件不应小于20mm。法兰盘一般为铸钢件，其作用是将阀门与钢管联接在一起，厂家可以直接提供。

The gate valve is used as the drainage equipment, which can not be installed directly, and the steel pipe and flange matched with the gate valve are required. The steel pipe can be designed and processed by itself, and the wall thickness of the steel pipe shall be determined according to the service life. In practice, the wall thickness of steel pipe welded with steel plate shall not be less than 10mm, and that of steel castings shall not be less than 20mm. The flange is generally a steel casting, which is used to connect the valve with the steel pipe, and the manufacturer can provide it directly.

在中小型水库应用，可设两台闸阀，分别为检修门与工作门，中间用活节联接，以便于拆卸。（活节需自行设计和加工）

In the application of small and medium-sized reservoirs, two gate valves can be set, namely inspection door and working door, which are connected with movable joints in the middle to facilitate disassembly. (the movable joint shall be designed and processed by itself)

一般形式：1、阀门井（塔）。按一般中小型水库取水塔设计能满足闸阀安装、检修为原则，一般采用方形，其结构计算按水工钢筋混凝土结构计算。2、输水洞。按通常的水库输水洞设计和计算。3、布置形式。按其位置可分为坝前式、坝中式、坝后式布置。按阀门数量可分为单阀、双阀式布置。

General form: 1. Valve well (tower). According to the principle that the design of water intake tower of general small and medium-sized reservoir can meet the installation and maintenance of gate valve, it is generally square, and its structural calculation is calculated according to hydraulic reinforced concrete structure. 2. Water conveyance tunnel. According to the usual design and calculation of reservoir water conveyance tunnel. 3. Layout form. According to its location, it can be divided into dam front type, dam middle type and dam back type. According to the number of valves, it can be divided into single valve and double valve arrangement.

应用闸阀作水库放水设备优点（见《表1》）：1、运行可靠，止水效果好。闸阀的启闭可分为手动、电动两种，故运行可靠。由于闸阀采用紫钢或黄铜止水，止水效果非常好，使用年限长。2、造价低，使用闸阀要比平面钢闸门造价低40%左右。3、施工简单，安装方便。闸阀只要吊装就位，连接螺栓即可。4、便于管理，运行。一般闸阀都封闭在闸门井内非管理人员一般情况下无法随意启闭，也不易受到人为破坏。

Advantages of using gate valve as reservoir drainage equipment (see Table 1): 1. Reliable operation and good water stop effect. The opening and closing of gate valve can be divided into manual and electric, so the operation is reliable. As the gate valve adopts purple steel or brass water stop, the water stop effect is very good and the service life is long. 2. The cost is low. The cost of using gate valve is about 40% lower than that of plane steel gate. 3. Simple construction and convenient installation. As long as the gate valve is hoisted in place and connected with bolts. 4. Easy management and safe operation. General gate valves are closed in the gate shaft, and non management personnel can not open and close them at will under normal circumstances, and they are not easy to be damaged by human beings.