A butterfly valve is a quarter-turn rotary motion valve used to stop, regulate, and start the flow. The butterfly valve has a flap mounted on a rotating shaft. When the butterfly valve is completely closed, the disc will completely block the pipeline. When the butterfly valve is fully opened, the flap is at right angles to the flow of gas or liquid.
The butterfly valve has only four main components: valve body, valve disc, valve stem, and valve seat.
Butterfly valve body: The valve body of the butterfly valve is usually installed between the two pipe flanges, the most common is the lug and wafer valve body design.
Butterfly valve flap: The flap is the way the valve stops flowing-it is equivalent to a plug valve in a plug valve, a gate in a gate valve, or a ball in a ball valve. To improve flow, sealing, and/or operating torque, there are changes in the design and direction of the valve disc.
Butterfly valve stem: The valve stem of the butterfly valve can be an integral shaft or a two-piece (separate valve stem) design. In most elastic valve seat designs, the valve stem is protected from the effects of media, so materials can be effectively selected in terms of cost and mechanical performance.
Butterfly valve seat: The valve seat of an elastic valve seat butterfly valve uses an interference fit between the flap edge and the valve seat to provide closure. The seat material can be made from many different elastomers or polymers. The seat can be bonded to the body, or it can be pressed or locked.
Rotate the handle 90° to completely close or open the valve. Large butterfly valves are usually equipped with a so-called gearbox, which connects the handwheel to the valve stem through gears. This simplifies the operation of the valve, but at the expense of speed.
Due to the design of the butterfly valve, it requires less material. The most economical type is the clip-on type sandwiched between two pipe flanges. The other type is a lug wafer design, which is fixed between the two pipe flanges by bolts connecting the two flanges and the through-hole of the valve housing. In addition, ordinary butterfly valve materials are generally cheaper.
This is because their compact design requires much less space than other valves.
Butterfly valve reliability and reduced maintenance requirements make it popular. Their reduced degree of wear makes the valve's life longer. This reduces direct operating costs and reduces the time required for valve maintenance.
Butterfly valves can be widely used. They perform well in large volume water applications and mud applications. The following are some typical applications of butterfly valves:
Cooling water, air, gas, fire protection, etc.
Mud and similar services
High-pressure and high-temperature water and steam facilities
Compressed air or gas applications
The above information is provided by a butterfly valve exporter.