Oct. 19, 2023
Why do we use a butterfly valve? The butterfly valve is a quarter-turn rotary motion valve used to stop, adjust and start the flow.
The butterfly valve can be opened easily and quickly. The 90° rotation of the handle provides complete closing or opening of the valve. Large butterfly valves are usually equipped with a so-called gearbox, where the handwheel is connected to the valve stem by a gear. This simplifies the operation of the valve, but at the expense of speed.
Due to their small size, simple structure, and lightweight, butterfly valves are increasingly used in piping systems such as cold and hot air, water and electricity, environmental protection, building water supply and drainage, and municipal engineering. Used as a medium for intercepting or intermediary flow. On many occasions, due to the advantages of the butterfly valve itself, it has been possible to replace gate valves, globe valves, ball valves, and other valves in industrial pipeline applications.
The structure of the butterfly valve is very simple, with only a few simple parts such as the valve body, valve stem, valve disc, valve seat, and transmission. Although the structure is simple, the function of the butterfly valve cannot be underestimated. The small structure has great practical value.
The butterfly valve can be used to adjust the flow. When the flow adjustment butterfly valve needs to be under special working conditions, or in a sealed environment, the performance requirements are strict, or the operating conditions of the butterfly valve are severely worn, low temperature, and other harsh work.
ㆍCompared with other types of valves, butterfly valves have many advantages.
ㆍCompact design; small space requirements.
ㆍLightweight; easily supported by the piping system.
ㆍFast operation; reduce opening or closing time.
ㆍEasy to install.
ㆍThe operating torque is small and the operation is simple.
ㆍAvailable in very large sizes.
ㆍImprove energy efficiency.
ㆍLow-pressure drop, high-pressure recovery.
ㆍThe long service life of the valve.
ㆍThe construction cost is relatively low.
ㆍThe number of parts is small; therefore, maintenance is reduced.
However, the butterfly valves listed below have few disadvantages.
ㆍThrottle applications are limited to low dropout.
ㆍThe disk motion is affected by the turbulence of the flow.
ㆍThe valve disc is always under pressure, even if it is in the open state, it will interrupt the fluid flow.
ㆍThe possibility of cavitation and blocked flow is a concern.
ㆍPoor sealing function.
ㆍNot suitable for the high-pressure difference.
ㆍDue to their lightweight and small space requirements, butterfly valves are easier to operate and install into applications.
ㆍCompared with gate valves, the face-to-face size of butterfly valves is much smaller, and it is an ideal valve used in small spaces.
ㆍThe butterfly valve is easier to operate and reduces faster opening and closing-it only takes a quarter of a turn to fully open and close the valve.
ㆍButterfly valves have a much shorter shaft than gate valves, which means there are fewer access problems.
ㆍDue to lower requirements and lighter weight, butterfly valves are generally cheaper.
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