1, when be being installed, valve of a powerful person should stop in what shut locally.
2, open position should be pressed butterfly board rotate angle will decide.
3, the butterfly a powerful person that contains by-pass valve, by-pass valve should be opened first before open.
4, should undertake installing by the installation manual of the manufactory, the butterfly a powerful person with great weight, should set firm foundation. -- news source: Shanghai China connects group rich to silver coin water pump factory
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