Driven by the “dual carbon” goals, the valve industry is undergoing a profound green transformation. In the second half of 2025, China’s green valve market reached 18.7 billion yuan, a year-on-year increase of 52%, among which products such as low-leakage valves and special valves for photovoltaics grew by more than 80%.

Dimensional accuracy: In manifold block machining, the dimensional accuracy requirements for holes are relatively high. Different fit requirements correspond to different tolerance grades. For example, 0T2-T18 is used for dimensions with no fit requirements, 7-T8 is used for fit dimensions with high precision requirements, and 06 is used for precision fit dimensions of important parts, etc.

Geometric tolerances: The perpendicularity tolerance among the six surfaces of the manifold block should preferably be 0.05mm, and must not exceed 01m; the parallelism tolerance between opposite surfaces (i.e. parallel planes) is 03mm; the flatness tolerance of each surface is 002mm; the perpendicularity tolerance between the thread and its mating surface is 0.05mm.

The main differences between ball valves and butterfly valves are as follows:

Structural differences:

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