Xinming automatic valve industry teaches you how to choose a valve
Long service life, but it is difficult to achieve complete sealing. The triple migraine butterfly valve developed now can achieve bubble-level sealing. The triple migraine butterfly valve is divided into composite layer sealing and full metal sealing. The latter has higher technical content and higher processing costs, but the reliability and service life of the seals are much longer. In the matching layer, the butterfly valve is three-sided. Metal seals can adapt to higher operating temperatures, while elastic seals have the disadvantage of being limited by temperature. If you need to use a butterfly valve as a flow control, the first thing is to choose the correct size and type of valve. The structural principle of the butterfly valve is particularly suitable for the manufacture of large-diameter valves. Butterfly valves are not only widely used in general industries such as petroleum, natural gas, chemical and water treatment, but also in cooling water systems of thermal power plants. Commonly used butterfly valves include wafer butterfly valves and flanged butterfly valves. The disc butterfly valve is connected between the two pipe flanges by stud bolts. Flange butterfly valves are equipped with flanges on the valve. The flanges at both ends of the valve are bolted to the pipe flanges. The strength function of the valve refers to the ability of the valve to withstand the pressure of the medium. The valve is a mechanical product that withstands internal pressure, so it must have satisfactory strength and rigidity to ensure long-term use without cracking or deformation. The ball valve evolved from the plug valve. By rotating 90 degrees, it has the same lifting effect, but the difference is that the cock body is a sphere with a circular through hole or channel that passes through its axis. The share of the spherical surface and the channel opening should be such that when the ball rotates 90 degrees, the ball should show the spherical surface at the entrance and exit, and then prevent movement. Only need to rotate 90 degrees and a small rolling torque to close the ball valve tightly. The completely equal inner cavity of the valve provides a straight flow path with little resistance to the medium. It is generally believed that ball valves are most suitable for direct opening and closing applications, but recent developments have designed ball valves to save and control flow. The main feature of the ball valve is compact structure, easy operation and maintenance, suitable for general operating media such as water, solvent, acid and natural gas, and also suitable for harsh operating conditions (such as oxygen, hydrogen peroxide), methane and ethylene. The ball valve body can be integrated or combined. The stem axis of the globe valve is in line with the sealing surface of the valve seat. The valve stem has a relatively short opening or closing stroke, and has a very reliable blocking effect, which makes the valve very suitable for media blocking or discharging
