Cut-off valve and gate valve
Most of the original pipeline system valve is mainly used to cut and regulation of the media, this part of the valve than in the major share of the entire system, the amount of more durable valves required, cost-effective, and should be in the media when forward flow regulation and set off, transformation or repair the pressure to prevent the media back, which features a two-way cut. Now, this part of the valve in the pipe network system, the main applications of the cut-off valves, gate valve, butterfly valves and ball valves. Cut-off valve and gate valve, two-way cut with good function, the sealing performance and service life are good, are one of the valve ancestor, but the cut-off valve gate-type structure by natural limitations, form a large operating torque, and can not produce large diameter, the largest diameter on the market today only DN400; valve no regulatory function, to regulate the flow of a substantial risk of loss exists gate defects, and large diameter valve the same shape and height of its large, in the manufacturing and transport the difficulties.
With this, compared to a gate valve opening and closing time is short, the operating torque, installation space is small and light weight characteristics, some division of labor instead of using butterfly valves. But all along, butterfly valve sealing performance did not fully meet the market requirements; in addition to the center line rubber lined butterfly valve can be in a certain way within the sealed pressure, the other basic structure is one-way flow. Midline not restricted by the popularity of rubber. Improved, the market appears flexible stainless steel sheet structure of the two-way valve, but its high price. Currently used in petroleum, natural gas, gas pipelines and other media more important, in general, the network, in particular, very little water system applications.
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