刀闸阀的启闭部位为楔形。楔体的运动方向与流体方向垂直。刀闸阀只能全开和全关，不能调节或节流。接下来，我们就和德沃斯一起来了解一下刀闸阀在应用过程中常见的故障及解决方法!1.刀闸阀关闭部位泄漏(1)泄漏原因①刀闸阀密封面未磨好;②密封圈与阀座、阀瓣配合不严密;③阀瓣与阀杆连接不牢固;④阀杆弯曲扭曲，使上下关闭件不对中;⑤关闭过快，导致密封面接触不良或损坏; ⑥ Improper material selection makes the valve unable to withstand medium corrosion; ⑦ Some media gradually cool down after the valve is closed, resulting in fine cracks on the sealing surface and erosion; ⑧ The valve can’t be closed tightly due to the embedding of welding slag, rust, dust and other impurities, or the valve core is blocked due to the falling off of mechanical parts in the production system. (2) Solutions ① Conduct pressure test carefully before use. If leakage is found on the sealing surface or the root of the sealing ring, handle it before use； ② Check whether all parts of the valve are in good condition in advance. Do not use the valve with bent valve rod or the valve disc is not firmly connected with the valve rod; ③ The valve should be closed firmly without strong force. In case of poor contact or obstruction between sealing surfaces, it should be opened a little immediately to let sundries flow out, then closed tightly; ④ When selecting the valve, we should consider the corrosion resistance of the valve body and closing parts; ⑤ It should be used correctly according to the structural characteristics of the valve; ⑥ In case of medium cooling and large temperature difference after valve closing, close the valve after cooling; ⑦ A filter should be added to the valve that may enter impurities. 2. Filler Leakage of Knife Gate Valve (1) Reasons of Leakage ① The filler does not adapt to the corrosion, temperature and pressure of the working medium; ② The filling method is wrong. In particular, the whole filler is placed in a spiral, which is most likely to cause leakage; ③ The machining accuracy or surface finish of the valve rod is not enough, there are ellipses or nicks; ④ The valve rod has pitted or rusted due to open air; ⑤ The valve stem is bent; ⑥ The filler has been used too long and aged; ⑦ Operation is too fierce. (2) Solutions ① Proper filler selection; ② Correct method of filling; ③ If the processing of valve rod is unqualified, repair or replace it; ④ Protective measures should be taken to prevent corrosion; ⑤ The bent valve rod should be straightened or renewed; ⑥ The filler should be replaced after a certain period of use; ⑦ Pay attention to stable operation. Open a...

球阀是近年来广泛应用的一种新型阀门。三通球阀是一种比较新型的球阀。它在自身结构上有独特的优势。广泛应用于石油、化工、城市给排水等需要切断、分流、汇流的工况。三通球阀的特点:一体化结构，法兰连接少，可靠性高;2.使用寿命长，流通容量大;3.三通球阀按结构形式可分为l型、t型和y型。根据不同的工况选择不同的结构形式。 Advantages of Three-way Ball Valve: 1. Low fluid resistance. Its resistance coefficient is equal to the pipe section with the same length; 2. Simple structure, small volume and light weight; 3. Tight and reliable, good sealing performance. It has been widely used in vacuum system; 4. Easy operation and quick opening and closing.It only needs to rotate 90° from full open to full close. It facilitates remote control; 5. Convenient maintenance. The sealing ring is generally movable, which is convenient for disassembly and replacement; 6. When the valve is fully open or closed, the sealing surface of the ball and valve seat is isolated from the medium. When the medium passes through, the valve sealing surface won’t be eroded. 7. Wide range of application. The diameter of three-way ball valve is as small as a few millimeters and as large as a few meters. It can be used in high vacuum and high pressure environments. Precautions for Maintenance of Three-way Ball Valve: 1. The valve handle rotation position should be reserved; 2. It can’t be used as throttling; 3. Ball valve with transmission mechanism should be installed vertically.

锻钢闸阀是用金属钢材料锻造而成的闸阀。锻钢闸阀应用广泛。主要用于管道的切断。它们只能全开和全闭，不能用于调节和节流。锻钢闸阀阀盖设计形式:(1)螺栓阀盖。按照这种设计形式，阀体和阀盖用螺栓和螺母连接，并用螺旋缠绕垫圈密封(316卡箍柔性石墨制造)。可根据客户的特殊要求，采用金属环连接;焊接阀盖。根据这种设计形式，阀体与阀盖采用螺纹连接，全焊密封。可根据客户的特殊要求，采用全贯式连接; (3) Pressure self-tightening bonnet. According to this design form, the valve body and bonnet are connected by thread and sealed by internal pressure self-sealing ring. Structural Features of Forged Steel Gate Valves: (1) Low fluid resistance; (2) Small size, light weight; (3) Good sealing performance, widely used in vacuum system; (4) Simple structure, easy disassembly and replacement. Precautions for Forged Steel Gate Valve: (1) Pay attention to the pressure and temperature of forged steel gate valve; (2) Pay attention to the switch position of forged steel gate valve; (3) Pay attention to the blowdown and blockage of forged steel gate valve body; (4) Pay attention to the diameter of forged steel gate valve is flush with the seal ring seat.