Views: 0 Author: J-VALVES Publish Time: 2026-04-13 Origin: Site
Butterfly valves are common fluid control valves widely used in water treatment, petrochemical, food processing and many other industries due to their simple structure, quick operation, light weight and low cost. A butterfly valve regulates or completely shuts off fluid flow by means of a rotating disc (butterfly plate). Various types of butterfly valves are available for selection according to different working environments and requirements.
The basic structure of a butterfly valve consists of a valve body, butterfly plate, valve stem, sealing ring and actuator. The butterfly plate is connected to the valve body via the valve stem and can rotate within the valve seat to adjust the valve opening and control fluid flow. The working principle of a butterfly valve is relatively straightforward: when the butterfly plate rotates 90 degrees, the fluid passage is fully opened or closed, enabling rapid flow regulation and on-off operation.
Based on structure, working principle and application fields, butterfly valves are divided into several categories, each with distinct characteristics and applicable scopes. The main classifications are as follows:
Soft-sealed Butterfly Valves: Soft-sealed butterfly valves use elastic materials (such as rubber and PTFE) as sealing rings, which form a seal upon contact with the butterfly plate. They feature excellent sealing performance and are suitable for low- and medium-pressure applications. Advantages include low cost and effective sealing, but they are not applicable to high-temperature, high-pressure or highly corrosive environments.
Metal-sealed (Hard-sealed) Butterfly Valves: Metal-sealed butterfly valves adopt metallic materials (such as stainless steel and alloy materials) for sealing rings, making them suitable for high-temperature, high-pressure and highly corrosive conditions. They possess high temperature resistance, pressure resistance and corrosion resistance, and are widely used in petrochemical, power, metallurgy and other industries. However, their sealing performance is slightly inferior to that of soft-sealed valves, thus requiring more precise machining and installation processes.
Manual Butterfly Valves: Operated via a handwheel or lever, manual butterfly valves are suitable for applications with low flow regulation requirements. They are simple to operate and low in cost, but require manual operation, making them ideal for small piping systems or infrequent regulation scenarios.
Pneumatic Butterfly Valves: Driven by air pressure to actuate the valve stem, pneumatic butterfly valves are used in systems requiring remote control and automation. They offer fast response and high control accuracy, and are widely applied in industrial processes with automated control demands.
Electric Butterfly Valves: Driven by electric actuators, electric butterfly valves achieve precise flow control and are extensively used in applications requiring accurate flow regulation. They can be controlled by on-off or modulating signals, suitable for remote operation and complex process flows.
Hydraulic Butterfly Valves: Powered by hydraulic drive, hydraulic butterfly valves are designed for high-load or high-thrust systems, commonly used in petrochemical and heavy industries.
Flanged Butterfly Valves: Connected to piping systems via flanges, flanged butterfly valves are typically used in medium and large piping systems. Flanged connections are convenient and reliable, capable of withstanding relatively high pressure and temperature.
Clamped Butterfly Valves: Quickly connected to pipelines by clamps, clamped butterfly valves are suitable for small piping systems with easy installation and disassembly, commonly used in food and beverage industries.
Wafer Butterfly Valves: The valve body is clamped between two pipe sections with bolts, featuring simple installation and suitable for small and medium piping systems. Wafer butterfly valves are often used in low-pressure pipelines, widely applied in HVAC systems and water treatment industries.
Single-Disc Butterfly Valves: The butterfly plate is an integrated structure, suitable for applications with low flow regulation requirements. With a simple structure and convenient operation, they are widely used in low- or medium-pressure fluid systems.
Double-Disc Butterfly Valves: Equipped with two independent butterfly plates, double-disc butterfly valves are used for applications requiring large flow control. Their structure is more complex, yet provides better sealing performance and a wider flow regulation range.
Triple-Disc Butterfly Valves: Composed of three independent butterfly plates, triple-disc butterfly valves are generally used in larger-diameter piping systems. Their structure delivers enhanced pressure resistance and flow regulation capacity, widely applied in large industrial pipelines and high-pressure systems.
Butterfly valve selection requires comprehensive consideration of system operating conditions, fluid properties and operational requirements. Key factors to take into account are as follows:
Chemical properties, temperature, pressure and other characteristics of the fluid influence valve selection. For instance, corrosive fluids require metal-sealed butterfly valves with high corrosion resistance; high-temperature and high-pressure fluids demand materials and structures resistant to extreme temperatures and pressures.
Different types of butterfly valves have varying pressure and temperature ratings. Ensure the valve’s nominal pressure and temperature range meet working conditions to avoid valve failure caused by excessive pressure or temperature.
Select an appropriate sealing method based on the system’s fluid sealing requirements. Soft-sealed butterfly valves are suitable for low-pressure and ambient-temperature environments, while metal-sealed valves apply to high-temperature, high-pressure and corrosive conditions. Sealing performance selection determines the valve’s reliability and service life.
For applications requiring precise flow regulation, electric or pneumatic butterfly valves are recommended, as they provide more accurate control for automated systems. Manual butterfly valves are suitable for infrequent regulation scenarios.
Installation space and maintenance convenience should also be considered. Flanged butterfly valves are suitable for large-scale systems, while clamped valves apply to space-limited or quick-installation systems. Easy-to-maintain valves reduce system downtime and improve production efficiency.
As an important fluid control device, butterfly valves are widely used across various industries thanks to their excellent performance and broad applicability. Understanding the classification and application characteristics of butterfly valves helps users select the most suitable valve to ensure efficient and safe system operation. During the selection process, comprehensive consideration of fluid type, working environment, control accuracy and maintenance requirements optimizes valve performance and extends its service life.
