common cast steel gate valves and used together with special valves, such as: plate gate valve, knife gate valve, hard seal gate valves and the soft-sealing gate valve and so on, is still significant differences: due to the general gate generally have leakage or rusty phenomenon, valve manufacturing technology, production of rubber and elastic seal gate valves to overcome the common gate valve seating and rust bad shortcomings, flexible valve seat seal gate valves adopted elastic shutters have slight elastic deformation. Compensation function to achieve the good sealing effect. The valve has a light switch, reliable sealing, good elastic memory, long service life. Usually, the gate has the following widely used categories: one is the product oil pipeline and storage equipment; Second, clean natural gas pipeline and flat gate valve with flow guide hole is also very convenient; Three, oil and gas production wellhead, namely oil tree valves; Four is a large water transport engineering and urban gas pipeline; The last is a pipe with suspended particulate medium; Due to the gate valves are divided into various types, impassability place need different function of cast steel gate valves to complete, with the development of the market and the progress of the society, it is believed that in our life will be more new gate valves.

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