The closed check valve is a smart valve that is installed in the water pump outlet of the high-rise building water supply system and other water supply system, and prevents the flow of media, water hammer and water hammer. The valve with electric valve, check valve and water hammer eliminator three kinds of function, can effectively improve the water supply system safe and reliable, and will be slow, quick closing, slowly-closing eliminate water hammer principle of technology integration, to prevent pumping water hammer and water hammer pump is going to produce.

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