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Introduction to common sense of American standard gate valve and working principle of American standard ball valve

by:Sino Valves     2021-11-28
American standard valves mainly have API and ASME standards. ASTM and ASTM are material standards; valves designed, manufactured, produced, and tested according to American standards are called American standard valves. The American standard valve is a control component in the fluid conveying system. It has the functions of cut-off, regulation, diversion, prevention of backflow, voltage stabilization, diversion or overflow and pressure relief; the valve used in the fluid control system is cut off from the simplest American standard There are many types and specifications of American standard valves used in extremely complex automatic control systems. Valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. You must know the common sense about American standard gate valves. Many people are not clear about the term American standard gate valves, but people are very familiar with the gate setting. In fact, the two of them are the same thing. American standard gate valve is a tool used in petroleum, hydropower, chemical and other fields to realize the circulation or cut off in pipelines. Compared with the general gate valve, it has stronger sealing performance, easier switching, and the elastic seat-sealed gate valve has a more compensating effect, effectively making up for the defects of poor sealing and rusting of general gate valves. First of all, the starting component of the American standard gate valve is the gate, and the movement direction of the gate is perpendicular to the fluid flow direction in the pipeline. Therefore, the American standard gate valve often has the effect of opening and closing the fluid in actual work. Used for regulation and throttling. Secondly, there is a pressure relief hole in the American standard gate valve, and it is necessary to avoid its blockage during normal use. The pressure relief hole is designed to prevent abnormal pressure rise in the cavity. When the American standard gate valve is closed, there is a cryogenic medium in its cavity, but as time goes by, the cryogenic medium will continue to absorb heat and vaporization will occur, and the volume of the vaporized medium will expand and produce larger If the pressure accumulates to a certain level, it will destroy the valve and cause danger. The function of the pressure relief hole is to discharge the excess pressure, so that the pressure in the cavity returns to a low temperature state. Although the installation of the American standard gate valve is simple, the application range is wide, the fluid resistance in the pipeline is small, the flow is not disturbed, the flow direction is not restricted, and the opening and closing is easy, but due to the large size, a certain space is required for opening and the sealing surface is between Erosion is prone to occur, and it is troublesome to repair after failure. People should be cautious in using it. What are the working principles and installation requirements of the standard ball valve? As a valve device with a ball as the closing part, the main function of the American standard ball valve in the pipeline is embodied in cutting off, distributing and changing the flow direction of the medium. Although it is the same type of valve as the flanged gate valve, due to the difference in structure, there is still a big difference in the working principle and installation requirements. The working principle of the American standard ball valve. During the opening process, the ball valve is initially closed. Due to the pressure of the valve stem, the ball is tightly pressed on the valve seat. When the handwheel of the valve body is turned counterclockwise, at this time, The valve stem is stressed and the ball begins to slowly leave the valve seat. When the valve stem continues to be pushed, the valve stem and the valve stem spiral groove produce guide pin interaction, and make the ball rotate without friction. In the open position, the valve stem reaches the limit and the ball reaches the fully open position. At this time, the work of connecting and cutting off, distributing and changing the direction of the medium flow begins. During the closing process, the entire operation process presents the opposite phenomenon, that is, turning the handwheel counterclockwise to let the ball leave the valve seat and start the rotation. After reaching a certain position, the guide pin action will cause the valve stem and the ball to rotate half a circle of 90 degrees. Continue to apply pressure to realize the non-contact rotation of the ball and the valve seat by 90 degrees, and the final rotation of the handwheel makes the ball tightly pressed on the valve seat. The installation points of the American standard ball valve The installation of the American standard ball valve is a strict procedure, which requires professional personnel to install it. To ensure the quality of the installation, be sure to remove the protective caps at both ends of the flange before installation, and there are residual impurities in the pipeline It is cleaned, and the pipes near the installation point do not sag and bear external forces. At the same time, the flange connection bolts must be tightened after installation. The working principle and installation points of the American standard ball valve have been introduced for everyone. If there is a demand, you must find a professional manufacturer to purchase, so as to ensure the quality. This article was edited and published by Valve (Technical Department)
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