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Based on the configuration of the sealing surfaces, gate valves can be classified into wedge-type gate valves and parallel-type gate valves. Wedge-type gate valves are further subdivided into single-disc, double-disc, and elastic-disc types; parallel-type gate valves are subdivided into single-disc and double-disc types. Based on the position of the valve stem threads, they can be classified into rising-stem valves and non-rising-stem valves.