A butterfly valve is a valve used to regulate the flow of liquid. A metal disc in the body of valve is positioned perpendicular to the flow in closed position and rotated one quarter of a turn to be parallel to the flow ...
Check valves are installed at the connection of home sewer line to the city sewer line. When city sewer lines are filled to capacity, water from city sewer line tends to flow towards home sewer lines. Check valves suppli...
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