Các
vanlà thành phần điều khiển trong hệ thống vận chuyển chất lỏng đường ống. Nó được sử dụng để thay đổi phần chuyển động và hướng dòng chảy của môi chất. Nó có các chức năng chuyển hướng, cắt, điều chỉnh, tiết lưu, kiểm tra, chuyển hướng hoặc giảm áp suất tràn.
Vanused for fluid control, from the simplest shut-off van to the various vans used in extremely complex automatic control systems, have a wide range of varieties and specifications, and the nominal diameter of the van ranges from extremely small instrument vans to large diameters up to 10m. Vanfor industrial pipelines. Cácvan can be used to control the flow of various types of fluids such as water, steam, oil, gas, mud, various corrosive media, liquid metals and radioactive fluids. Cácworking pressure of the van can be from 1.3х10MPa to 1000MPa ultra-high pressure and working temperature From the ultra-low temperature of -269℃ to the high temperature of 1430℃. Cácvan can be controlled by a variety of transmission methods, such as manual, electric, hydraulic, pneumatic, worm gear, electromagnetic, electromagnetic-hydraulic, electric-hydraulic, pneumatic-hydraulic, spur gear, bevel gear drive, etc. ; Under the action of pressure, temperature or other forms of sensing signals, it can act according to the predetermined requirements, or simply open or close without relying on the sensing signals. Cácvan relies on the drive or automatic mechanism to make the opening and closing parts lift and slide Move, swing or rotate, thereby changing the size of the flow channel to achieve its control function.
Cácpurpose of the van Cácvan is a kind of pipeline accessory, it is a device used to change the section of the passage and the flow direction of the medium, and control the movement of the conveying medium. It has diversion, cut-off, adjustment, throttling, check, diversion or overflow Functions such as pressure relief.
Specifically, the van has the following purposes: 1. Cut-off van: connect or cut off the medium in each section of the pipeline. Such as gate van, globe van, ball van, plug van, diaphragm van, butterfly van, etc. 2 Regulating vans: Regulate the flow and pressure of the medium in the pipeline. Such as throttle van, regulating van, pressure reducing van, safety van, etc. 3 Shunt van: change the flow direction of the medium in the pipeline, used to distribute, separate or mix the medium. Such as distribution vans, three-way plug vans, three-way or four-way ball vans, traps, etc. Valve classification There are many types of vans. With the continuous improvement of the process and performance of various complete sets of equipment, the types of vans are still increasing, but in general they can be divided into two categories: automatic vans rely on media (liquid, gas, Steam, etc.) a van that operates on its own. Such as safety vans, check vans, pressure reducing vans, traps, hydraulic control vans, emergency shut-off vans, exhaust vans, etc.
