Double volute pump body structure, a partition is set in the long a long hole is formed near the inner space. The ratio of the apertureand narrow flow passage space to divide the space into two, andto the hole length is 30, which is far beyond the Normal hole limit.The special process method is used for casting, which not onlyensures the smoothness of the inner flow passage, but also ensuresthe dense organization, which meets the product quality requirements.