current location: Home   >> News >> Company news

                  Characteristics and application of gate valve

                  Features and application of gate valve:

                  A gate valve is a sliding valve with a parallel gate as a closing element. The closing element (gate) is a valve moving vertically along the axis of the channel. The closing element may be a single gate or a double gate with a brace mechanism between them. Gate to seat pressure is controlled by acting with the medium pressure of the floating gate or floating seat. In the case of a double disc flat gate valve, this tension may be supplemented by a double disc opening mechanism. Gate valves have a variety of structural forms, the main difference is the use of different sealing element structure. According to the structure of the sealing element, the gate valve is often divided into several different types, and the common forms are flat gate valve and wedge gate valve. According to the structure of the valve stem, it can also be divided into lift lever gate valve and rotary lever (blind lever) gate valve.

                  The advantage of gate valve is the flow resistance is small, the flow resistance is similar to the short tube. The flat gate valve with the diversion hole can be installed on the pipeline and pigging can be carried out directly with the pig. Since the gate is sliding on both seat faces, the blind stem soft-seal gate valve fluid is suitable for media with suspended particles. The sealing surface of flat gate valves is actually automatically positioned. Seat sealing surface will not be damaged by body thermal deformation. And even if the valve is closed in a cold state, the thermal elongation of the stem will not overload the sealing surface. At the same time, when the valve is closed, no guide hole plate gate valve also does not require the closing position of the gate has a higher precision, so the electric plate valve can be used to control the opening and closing position.

                  When the medium pressure is low, the sealing force of the metal sealing surface is not enough to achieve satisfactory sealing. On the contrary, when the medium pressure is high, if the sealing surface is not lubricated by system medium or external medium, opening and closing frequently may make the sealing surface wear too much. Another disadvantage is that a circular gate moving laterally in a circular runner is only sensitive to flow control when it is at 50% of the valve's closed position. Moreover, when the gate breaks the high speed and high density media flow, it will produce violent vibration. The seat can also be throttled if it is v-shaped and tightly guided to the gate.

                  In various types of valves, the application of gate valve for a wide range of, in the pipeline generally used as a cut off medium, that is, all open or all closed use. In general, gate valves cannot be used for regulating flow. Gate valves can be used for low temperature, low pressure, high temperature and high pressure, and can be used for a variety of different media according to the different material of the valve. But gate valves are generally not used to transport mud and other granular medium in the pipeline. Gate valves have many advantages and are therefore widely used. Generally, the pipeline with a diameter larger than DN50 is used as the device to cut off the medium. Gate valves are widely used in the pipeline with a small orifice. Gate valves made of forged steel are especially used in the pipeline.


                  直接看的成人无码视频网站| 国产成A人亚洲精V品无码| 国产精品亚洲а∨无码播放| 欧美成人中文字幕在线看| 免费VA在线观看无码| 少妇无码一区二区二三区| 日本精品自产拍在线观看中文| 精品久久久无码中文字幕天天| 亚洲成a人片在线观看无码专区| 久久亚洲精品中文字幕 | 在线精品自拍无码| 久久久久亚洲精品无码蜜桃| 免费无码H肉动漫在线观看麻豆| 无码中文av有码中文a| 五月婷婷在线中文字幕观看 | 久久久中文字幕日本| 人看的www视频中文字幕| 18禁黄无码高潮喷水乱伦| 十八禁无码免费网站| 亚洲AV无码精品色午夜在线观看| 特级做A爰片毛片免费看无码| 7777久久亚洲中文字幕| 亚洲中文字幕久久精品无码喷水 | 亚洲国产精品无码久久青草| 精品久久久久久无码专区不卡| 日韩精品无码免费专区午夜不卡 | 久久有码中文字幕| 国产中文在线观看| 久久久久中文字幕| 狠狠综合久久综合中文88| 日本中文字幕一区二区有码在线| 亚洲乱码中文字幕久久孕妇黑人| 被夫の上司に犯中文字幕| 亚洲?V无码成人精品区日韩 | 狠狠干中文字幕| 在线播放中文字幕| 精品亚洲欧美中文字幕在线看| 在线看片福利无码网址| 亚洲中文字幕无码一区二区三区| 精品亚洲成A人无码成A在线观看 | 亚洲AV无码国产丝袜在线观看|