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In high-rise buildings, people often worry about the lack of new air volume, and designers often feel very aggrieved. Because from the drawing point of view, fresh air standard value is not low, but w ...

In high-rise buildings, people often worry about the lack of new air volume, and designers often feel very aggrieved. Because from the drawing point of view, fresh air standard value is not low, but w ...

At present, China's various industries commonly used in the production of valve metal valves, metal valves for use has been a century of history, during which although improved through structure and m ...

The structural characteristics of the centerline butterfly valve stem axis, butterfly plate center, the center of the body in the same position. Simple structure, easy to manufacture. Common rubber li ...