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 ℃.

附件選擇

Attachment selection

應用閘閥作為放水設備，其本身不能直接安裝，需要與閘閥配套的鋼管和法蘭盤。鋼管可自行設計和加工，其鋼管壁厚應根據使用年限來決定。從實踐中看，用鋼板焊接的鋼管壁厚不應小于10mm，使用鑄鋼件不應小于20mm。法蘭盤一般為鑄鋼件，其作用是將閥門與鋼管聯接在一起，廠家可以直接提供。

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.

在中小型水庫應用，可設兩臺閘閥，分別為檢修門與工作門，中間用活節聯接，以便于拆卸。（活節需自行設計和加工）

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、閥門井（塔）。按一般中小型水庫取水塔設計能滿足閘閥安裝、檢修為原則，一般采用方形，其結構計算按水工鋼筋混凝土結構計算。2、輸水洞。按通常的水庫輸水洞設計和計算。3、布置形式。按其位置可分為壩前式、壩中式、壩后式布置。按閥門數量可分為單閥、雙閥式布置。

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.

應用閘閥作水庫放水設備優點（見《表1》）：1、運行可靠，止水效果好。閘閥的啟閉可分為手動、電動兩種，故運行可靠。由于閘閥采用紫鋼或黃銅止水，止水效果非常好，使用年限長。2、造價低，使用閘閥要比平面鋼閘門造價低40%左右。3、施工簡單，安裝方便。閘閥只要吊裝就位，連接螺栓即可。4、便于管理，運行。一般閘閥都封閉在閘門井內非管理人員一般情況下無法隨意啟閉，也不易受到人為破壞。

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.