What are the components of the electric gate valve
we often talk about? How much do we know about their internal structure? The following business valve manufacturer technicians will analyze the composition of the electric gate valve. The electric gate valve is controlled by an electric actuator. The gate valve is remotely operated by an electric device. Usually its electric actuator is installed in the gate valve. Of the upper part. The structure of the electric gate valve produced by our company is composed of valve stem, valve body, valve cover, gate plate, driving device and other parts (fasteners, stem nut, sealing packing). The middle flange of ordinary electric gate valve usually adopts gasket sealing structure. The advantages are reliable sealing, easy processing, and small bolt torque required. The disadvantage is that it is easily damaged and needs to be replaced regularly. The fully enclosed electric gate valve adopts a gasketless hard seal structure. This kind of sealing structure has reliable performance and is not affected by temperature fluctuations, guarantees the sealing performance under high temperature and high pressure medium conditions, avoids medium leakage caused by gasket fatigue or exceeding the life span, and reduces pollution. The disadvantage is that the required bolt torque is large and difficult to process. The working process of the electric gate valve mainly includes the following two steps: 1. When the gate valve is closed: the sealing surface of the gate valve can be sealed only by the medium pressure, which is to rely on the medium pressure to press the sealing surface of the gate to the valve seat on the other side to ensure the seal This is the self-sealing principle of the gate valve. Most gate valves adopt forced sealing, that is, when the valve is closed, the gate must be forced against the seat by external force to ensure the sealing performance of the sealing surface. 2. When the gate valve is opened: when the lift height of the gate is equal to 1:1 times the valve diameter, the fluid passage is basically completely unblocked, but this position cannot be monitored when the gate valve is running. In actual use, the maximum opening of the gate valve is marked by the apex of the valve stem, that is, the unmovable position, as its fully open position. In order to consider the locking phenomenon caused by temperature changes, it is usually opened to the top position, and then back 1/2-1 circle, as the position of the fully open valve. Therefore, the fully open position of the valve is determined by the position of the gate (that is, the stroke). What are the materials of the electric gate valve? There are many kinds of materials, the most basic are cast iron, cast steel, forged steel stainless steel 304 stainless steel 316, etc. Gate valves are classified according to their materials: stainless steel gate valves, forged steel gate valves, cast steel gate valves, carbon steel gate valves, cast iron gate valves, copper gate valves (also Divided into bronze gate valve, brass gate valve), ceramic gate valve, plastic gate valve. Stainless steel gate valve: stainless steel gate valve material is divided into 304 stainless steel gate valve, 316 stainless steel gate valve, 321 stainless steel gate valve. Forged steel gate valve: Forged steel gate valve is suitable for Class150 ~ 2500, working temperature -29 ~ 425 ℃ (carbon steel) or -29 ~ 500 ℃ (stainless steel) small diameter pipeline, used to cut off or connect the medium in the pipeline . Cast steel gate valve: All gate valves made of metal steel materials cast into castings are collectively referred to as cast steel gate valves. Cast iron gate valves: Cast iron gate valves are divided into gray cast iron gate valves and ductile iron gate valves, which are mostly used in water system pipelines. Features of electric structure 1. It adopts pressure self-tightening seal or valve body and valve cover gasket seal structure, which is safe and reliable to use. 2. The valve disc adopts a double gate with a universal top structure in the middle, which can automatically adjust the fit between the valve disc and the sealing surface of the valve seat to ensure the sealing of the valve. At the same time, this structure is convenient for maintenance, saves costs, and has better valve interchangeability. 3. The sealing surface of the valve disc and valve seat is made of cobalt-chromium-tungsten cemented carbide by plasma spray welding. The sealing surface has high hardness, abrasion resistance, abrasion resistance and long service life. 4. The valve stem is made of nitrided steel with surface nitriding treatment, high hardness, scratch resistance, corrosion resistance and long service life. 5. The electric device is equipped with a torque control mechanism, an on-site operating mechanism and a hand and electric switching mechanism. In addition to local operation, remote operation, PLC control, 4-20mA current input and output intelligent control, etc. can also be carried out. .
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