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What is the difference between bidirectional and unidirectional of butterfly valve?

Unidirectional sealing butterfly valve is that when the front of the butterfly plate of the butterfly valve is closed, it must face the flow direction of the medium; the medium only flows in one direction, and there must be an arrow indicating the flow direction of the medium on the valve body.

Pay attention to the flow direction of the medium during installation. The two-way butterfly valve is a butterfly plate that can face or face the flow direction of the medium. There is no need to pay attention to the flow direction of the medium when installing, and there is no arrow indicating the flow direction of the medium on the valve body. The force on the stem of the two-way sealing butterfly valve is greater than that of the one-way sealing butterfly valve. In the design, for butterfly valves with the same diameter and pressure, the diameter of the two-way sealing butterfly valve stem is larger than that of the one-way sealing butterfly valve.


Bidirectional pressure generally refers to hard-sealed butterfly valves. Ordinary hard-sealed butterfly valves can only flow in one direction. Reverse flow will cause leakage. Two-way pressure butterfly valves are technological improvements based on ordinary hard-sealed butterfly valves to achieve double-sided flow. Pressure performance.

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