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Selection of control valve should pay attention to the problem
Release time:
2017/12/25 21:40
1. Regulating function ① requires the regulating valve to act smoothly; ② small opening adjustment performance is good; ③ select the required flow characteristics; ④ meet the adjustable ratio; ⑤ small resistance and large flow ratio (ratio of rated flow parameters of regulating valve to nominal diameter);⑥ adjust speed. 2, leakage and cut-off pressure difference This is an inseparable, interrelated two factors. Leakage should meet the process requirements, and the reliability of the sealing surface of the protection measures; cut off the pressure must be put forward, so that the selected control valve has enough output force to overcome it, otherwise it will lead to the implementation of the agency to choose large or small. 3, anti-blocking even clean media, there is also a blockage problem, this is
Release time:
2017/12/20 21:41
Manual valve, is through the handle, hand wheel operation of the valve, is the equipment pipeline on the use of a common valve. Its handle and handwheel rotate clockwise to close and counterclockwise to open. However, there are also individual valves that open the opposite of the above. Therefore, before the operation should pay attention to check the opening and closing signs before operation. The handwheel and handle on the valve are designed according to normal manpower. Therefore, it is stipulated that the operator is not allowed to open or close the valve with the help of levers and long wrenches. If the diameter (length) of the handwheel and handle is less than 320mm, only individual operation is allowed. If the diameter of the handwheel is more than 320mm, two persons are allowed to operate together, or
Pressure Test Method of Check Valve
Release time:
2017/12/13 21:42
Check valve is to rely on the flow of the medium itself and automatically open and close the valve flap, used to prevent the medium back flow of the valve, also known as check valve, one-way valve, reverse flow valve, and back pressure valve. Check valve is a kind of automatic valve, its main function is to prevent the medium back, to prevent the pump and drive motor reverse, and the discharge of the container medium. Check valve pressure test method: check valve test status: lift check valve disc axis in a position perpendicular to the horizontal; swing check valve channel axis and disc axis in a position approximately parallel to the horizontal line. During the strength test, the test medium is introduced from the inlet end to the specified value, and the other end is closed,
Introduction to the principle and structure of gas pressure reducing valve
Release time:
2017/12/11 21:42
1. The medium pressure at the front of the valve enters the body cavity from the opening gap between the valve disc and the sealing ring of the valve body so that the medium pressure flows into the combination box of the bellows. The bellows and the spring are compressed by the medium pressure. The valve disc moves with the valve stem, and the valve disc closes the sealing ring of the valve body, cutting off the medium before the valve without supplementing the medium pressure after the valve. When the pressure of the medium after the valve is reduced, the bellows is deformed by the radial force of the adjusting spring, and the valve stem opens the disc. Make the medium through the valve body seal ring to supplement the valve after the pressure drop. 2. The gas pressure reducing valve is composed of valve body, valve cover, valve clack, valve body sealing ring, valve stem, bellows,
How to deal with control valve packing always leak
Release time:
2017/12/08 21:43
Control valve is one of the automatic control system of the terminal control components, due to the chemical plant, there are many high temperature, high pressure conditions, some media have strong corrosive and toxic, and flammable and explosive, when the valve packing leakage, not only cause waste of raw materials, but also cause serious pollution to the environment, and even cause fire, explosion, poisoning and other life-threatening safety accidents. Therefore, the control valve packing leakage problem should be paid enough attention to, in the design selection of a reasonable choice of sealing packing is very important. For the control valve packing seal, combined with years of work experience and related information, through the control valve stuffing box structure
Materials of cast and forged valves
Release time:
2017/12/04 21:43
Casting valve is cast into the valve, the general casting valve pressure rating is relatively low. Forged valves are forged and are generally used in high-grade pipelines. 1. casting 1. Casting: It is the process of smelting metal into liquid that meets certain requirements and pouring it into the casting mold. After cooling, solidification and cleaning, the process of obtaining castings (parts or blanks) with predetermined shape, size and performance is obtained. The basic process of modern machinery manufacturing industry. 2. The cost of the blank produced by casting is low, and it can show its economy for parts with complex shapes, especially with complex cavities; at the same time, it is suitable
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