D42HS and D942HS worm gear transmission double eccentric bidirectional metal hard seal butterfly valves
D42HS, D942HS, D642HS, D342HS-PN10, 16 worm gear transmission double eccentric bidirectional metal hard seal butterfly valves are widely used in hydraulic engineering, tap water, power circulation water, petroleum, chemical and other industrial pipelines to cut off medium flow.
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