current location: Home   >> News >> Company news

                  Function and principle of plug valve

                  Function and principle of plug valve:

                  Plugvalve: the plug body with a through hole is used as the valve for opening and closing parts. The plug body rotates with the stem to realize the opening and closing action. Small packless plug valves are also known as "cocks". Plug valve plug body for the cone (also have cylinder), and the body of the cone hole surface to form a sealing pair. The plug valve, the structure is simple, the switch is quick, the fluid resistance is small. Ordinary plug valve depends on the metal plug body and the body of the direct contact to seal, so poor sealing, opening and closing force, easy to wear, usually can only be used for low (no more than 1 mpa) and small diameter (less than 100 mm) occasions. In order to enlarge the application range of the plug valve, many new structures have been developed. Oil lubricated two - way all - copper plug valve is an important type of z. Special grease is injected from the top of the plug body into the body between the cone and the plug body to form an oil film to reduce the opening and closing torque and improve the sealing performance and service life. Its working pressure can reach 64 mpa,z high working temperature can reach 325℃,z large diameter can reach 600 mm. Access to plug valves comes in many forms. The common straight-through form is mainly used to cut off the fluid. Three-way and four-way plug valves are suitable for the fluid reversing plug valve opening and closing parts are a cylindrical body with holes, around the axis perpendicular to the channel, so as to achieve the purpose of opening and closing the channel. The plug valve is mainly used for opening and closing pipelines and equipment media.

                  The main advantages of the plug valve are as follows:

                  1. It is suitable for frequent operation, quick opening and closing, and portable. 2. Low fluid resistance. 3, simple structure, relatively small volume, light weight, easy maintenance. 4, good sealing performance 5, not limited by the installation direction, the flow of media can be arbitrary. 6. No vibration, low noise.

                  According to its structure, the plug valve can be divided into four types: compact type plug valve, self-sealing type plug valve, packing type plug valve and oil injection type plug valve. According to the channel form, it can be divided into three types: straight-through, three-way and four-way. Cock valve - valve type and purpose a cock valve is a valve in which the closing member (plug) rotates around the centerline of the body to open and close. The plug valve is mainly used for cutting off, distributing and changing the flow direction of the medium in the pipeline.

                  Due to the simple structure of the plug valve, open and close quickly (the plug can be completed by rotating a quarter of a circle), easy to operate, small fluid resistance, is still widely used. At present, it is mainly used for low pressure, small diameter and medium temperature. Plug valve plug and plug body is a well - matched cone, its taper is generally 1:6 and 1:7.

                  One, two through the copper core plug valve two through the copper core plug valve is usually used for low-pressure straight pipe, sealing performance depends entirely on the plug and plug body of the good or bad fit, its sealing surface pressure is achieved by tightening the nut at the bottom. Generally used for PN≤ 0.6mpa.

                  Two, two - way cast iron plug valve two - way cast iron plug valve is through compression packing to achieve the sealing of the plug and plug body. As a result of the packing, so the sealing performance is better. Usually they have a packing gland and the plug does not extend out of the body, thus reducing the leakage path of a working medium. This plug valve is widely used for PN≤1Mpa pressure.

                  Three, two - way all copper plug valve two - way all copper plug valve is through the pressure of the medium itself to achieve the pressure between the plug and plug body tightly sealed. The small head of the plug is extended upward out of the body, and the medium enters the big head of the plug through a small hole at the entrance, and the plug is pressed upward. This structure is generally used for air medium.

                  Four, three - way all copper plug valve in recent years, the application of the expanding scope of the plug valve, the emergence of three - way all copper plug valve with forced lubrication. A film of oil is formed between the plug and the sealing surface of the plug body due to forced lubrication. In this way, the sealing performance is better, opening and closing labor saving, to prevent damage to the sealing surface.


                  国产V片在线播放免费无码 | 久久伊人中文无码| 在线中文字幕av| 东京热无码av一区二区| 精品多人p群无码| 日本乱中文字幕系列观看| HEYZO无码综合国产精品227| 国产成人精品一区二区三区无码| 亚洲乳大丰满中文字幕| 国产高清无码二区 | 日韩欧精品无码视频无删节| 日韩亚洲欧美中文高清| 亚洲av无码专区在线观看素人| 无码一区二区三区在线观看| 中文字幕亚洲综合久久菠萝蜜| 人妻丰满av无码中文字幕| 亚洲AV永久无码精品一区二区国产| 无码人妻一区二区三区在线| 无码AV动漫精品一区二区免费| 色综合久久中文字幕无码| 亚洲无码精品浪潮| 91精品久久久久久无码 | 国产成人无码精品一区在线观看| 一本色道无码道DVD在线观看| 中文无码精品一区二区三区| 久久国产高清字幕中文| 欧美精品中文字幕亚洲专区| 人妻丰满av无码中文字幕 | 无码福利一区二区三区| 一二三四在线观看免费中文在线观看| 中文字幕精品无码一区二区三区| 亚洲不卡无码av中文字幕| 少妇极品熟妇人妻无码| 无码国内精品久久人妻麻豆按摩| 亚洲高清无码综合性爱视频| 欧美日韩久久中文字幕| 中文字幕日本人妻久久久免费| 三级理论中文字幕在线播放| 久久99中文字幕久久| 亚洲欧美在线一区中文字幕| 中文无码精品一区二区三区|