Why are they called butterfly valves?

1. Definition of butterfly valve:

Butterfly valve is a rotary valve with a disc-shaped closing member (can be round or rectangular, etc.) rotating 90° or about 90° to open and close the valve. Butterfly valve is an ancient valve, early due to poor sealing performance, can only be used for adjustment, such as the flue valve is a kind of adjustment butterfly valve. With the emergence of synthetic rubber and other resilient sealing materials, as well as the in-depth study of the sealing mechanism, there is a sealed butterfly valve. The emergence of resilient metal seats and new structural forms, so that the butterfly valve in high temperature, low temperature environment is also gradually adopted. The current development trend of butterfly valve is that it can be used for both regulation and sealing.

2. Classification of butterfly valve: 

Butterfly valve can be classified by various methods, for example, butterfly valve can be divided into cut-off type and regulating type according to the use and role; divided into midline, single eccentric, double eccentric and triple eccentric butterfly valve according to the structure form; divided into rubber sealed butterfly valve, teflon sealed butterfly valve and metal sealed butterfly valve according to the sealing material. 

3. Butterfly valves have several key features that make them popular in various industries and applications. 

Some of the main features of butterfly valves include:

Compact and lightweight design: 

Butterfly valves have a compact and lightweight construction, making them easy to install and suitable for applications where space is limited.

Quick and easy operation: 

Butterfly valves provide quick and efficient operation with their quarter-turn mechanism. They can be opened or closed rapidly, minimizing the time required for flow control.

Cost-effective: 

Butterfly valves are generally more cost-effective compared to other types of valves, such as gate valves or globe valves. Their simple design and fewer components result in lower manufacturing, installation, and maintenance costs.

Low pressure drop: 

Butterfly valves offer low pressure drop across the valve, meaning they cause minimal resistance to flow when fully open. This can contribute to energy savings and reduced pumping costs.

Versatility: 

Butterfly valves can handle a wide range of fluids, including gases, liquids, and slurries. They are available in various materials of construction, such as metal or resilient liners, to suit different media and operating conditions.

Excellent flow control: 

Butterfly valves provide good flow control capabilities, allowing for precise regulation of flow rates. They can be used for both on-off and throttling applications, providing flexibility in system operation.

Tight sealing: 

Butterfly valves typically have a tight sealing capability when closed, preventing leakage and ensuring system integrity. This is achieved through various sealing mechanisms, such as elastomeric or metal seals.

Low friction and torque requirements: 

Butterfly valves have low frictional resistance, resulting in low torque requirements for operation. This makes them suitable for manual operation or actuation with smaller and more cost-effective actuators.

Resilient to high velocities and pressures: 

Butterfly valves can withstand high flow velocities and pressures, making them suitable for demanding applications in industries like water treatment, HVAC, and oil and gas.

Ease of maintenance: 

Butterfly valves are relatively easy to maintain due to their simple design and fewer components. They can be quickly disassembled, inspected, and repaired or replaced if necessary.

4. Butterfly valves are widely used in various industries and applications for flow control. 

Some of the common applications of butterfly valves include:

Water and wastewater treatment: 

Butterfly valves are extensively used in water treatment plants, wastewater treatment plants, and distribution systems to control the flow of water, chemicals, and slurry.

HVAC systems: 

Butterfly valves are commonly employed in heating, ventilation, and air conditioning (HVAC) systems to regulate the flow of air and water in ductwork, cooling towers, and chiller units.

Oil and gas industry: 

Butterfly valves find application in the oil and gas industry for controlling the flow of crude oil, natural gas, and various fluids in pipelines, refineries, and storage terminals.

Chemical processing: 

Butterfly valves are used in chemical plants to regulate the flow of chemicals, acids, solvents, and other corrosive fluids in pipelines and reactors.

Power generation: 

Butterfly valves are utilized in power plants, including thermal power plants and renewable energy facilities, to control the flow of steam, cooling water, and other fluids in boilers, turbines, and cooling systems.

Marine and shipbuilding: 

Butterfly valves are commonly used in marine and shipbuilding applications to control the flow of water, fuel, and other fluids in piping systems, ballast tanks, and marine propulsion systems.

Pharmaceutical and biotech industries: 

Butterfly valves are employed in pharmaceutical and biotech industries for controlling the flow of liquids and gases in processing equipment, reactors, and cleanroom environments.

Food and beverage industry: 

Butterfly valves find application in the food and beverage industry for controlling the flow of liquids, such as milk, juices, beer, and wine, in processing and packaging systems.

Mining and mineral processing: 

Butterfly valves are used in mining operations and mineral processing plants to regulate the flow of ore slurry, tailings, and other mineral-based fluids in pipelines and separation equipment.

Fire protection systems: 

Butterfly valves are utilized in fire protection systems to control the flow of water or fire suppressant agents in sprinkler systems and fire hydrants.

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