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Steel knife gate valve is widely used in industry. The valve body is made of high carbon steel and the valve disc is made of forged steel. The precision machined parts ensure that the sealing face has excellent deburring, roughness and cleanliness, is not easy to wear, and the sealing performance can be maintained at a high level. Steel knife gate valve is non closing and non-rotating valve element. It consists of a cylinder with a circular flange at one end, in which a completely flat piston can move freely within the diameter of the valve core body.