Industrial actuated butterfly valves are widely used in various industrial scenarios, including chemical engineering, petroleum, water treatment, and HVAC, thanks to their compact structure, fast opening and closing, and excellent regulation performance. Selection should focus on five core dimensions: actuation method, working condition parameters, valve body structure, material matching, and control functions, to accurately meet system requirements.
I. Determine the Actuation Method to Meet Control Requirements
The actuation method directly determines the operational efficiency and automation level of the valve, and should be selected according to the control precision and power conditions of the working scenario:
Pneumatic actuation
Powered by compressed air, it features a fast response, simple structure, and good explosion-proof performance, making it suitable for working scenarios with flammable, explosive, or frequently opening and closing requirements. On-off pneumatic butterfly valves are equipped with solenoid valves, allowing for on-off control of pipeline media. They are ideal for situations where precise regulation is not necessary. Regulating pneumatic butterfly valves are fitted with positioners, enabling them to adjust the valve opening accurately to control the flow of the medium. These valves are suitable for flow regulation systems in water treatment and HVAC applications.
Electric actuation
Driven by electric motors, it offers high control precision and remote operation capability without the need for a compressed air source, suitable for working scenarios requiring long-distance control and high regulation precision. On-off Electric Butterfly Valves: These valves operate by opening and closing through the forward and reverse rotation of a motor. They are ideal for on-off control in automated production lines. Regulating Electric Butterfly Valves: These valves are paired with servo motors and controllers, enabling a valve opening regulation precision of ±2%. They are perfect for applications that require stable flow and pressure control.
Hydraulic actuation
With strong power and high anti-interference capability, it is suitable for large-diameter, high-pressure working conditions. However, its system structure is complex, and the maintenance cost is relatively high, so it is rarely used in general industrial scenarios.
II. Clarify Working Condition Parameters to Lock in Basic Specifications
Working condition parameters are the core basis for selection. The following indicators must be confirmed one by one to avoid valve-system incompatibility:
Pressure and temperature ratings
The common nominal pressure of industrial actuated butterfly valves ranges from PN10 to PN160, and the applicable temperature range varies with different sealing materials:
Medium-low pressure and normal temperature working conditions: PN10/PN16 ratings can be selected to meet regular pressure requirements.
High-pressure and high-temperature working conditions: Valves with PN40 and above ratings are required, and the valve body should adopt a high-temperature-resistant structural design.
Medium characteristics
Valve body and sealing materials should be selected according to the corrosiveness, viscosity, and particle content of the medium:
Corrosive media: The valve body should be made of 304/316 stainless steel, and the sealing surface should adopt polytetrafluoroethylene or fluororubber materials.
Media containing particles: Hard-sealed actuated butterfly valves are preferred, with sealing surfaces overlay-welded with hard alloys to enhance wear resistance and avoid internal leakage caused by particle abrasion.
Clean media: Sanitary polished valve bodies should be selected, and sealing components must comply with food-grade standards to prevent medium contamination.
Nominal diameter specifications
The nominal diameter of the valve must be consistent with that of the pipeline. Industrial actuated butterfly valves cover a nominal diameter range of DN50 to DN3000. For large-diameter pipelines, pneumatic or hydraulic actuation is preferred to avoid the insufficient torque of electric actuation.
III. Match Valve Body Structure to Ensure Sealing Performance and Durability
The valve body structure affects the sealing performance and application scope of the valve, with two key points to focus on:
Sealing structure: Soft seal vs Hard seal
Soft-Sealed Actuated Butterfly Valves: These valves offer excellent sealing performance and a low leakage rate, making them suitable for applications involving low pressure, normal temperatures, and clean media. However, they do not withstand high temperatures or pressures and are susceptible to aging.
Hard-Sealed Actuated Butterfly Valves: These valves provide high resistance to temperature and wear, making them ideal for use in high-pressure, high-temperature environments, as well as in media that contain particles. Their sealing performance is somewhat inferior to that of soft-sealed valves, and achieving an effective seal requires high-precision processing.
Connection method: Flange vs Wafer
Wafer-type actuated butterfly valves: Compact in structure, light in weight, and small in installation space, they are suitable for scenarios with limited pipeline space and low cost.
Flange-type actuated butterfly valves: With firm connection and good sealing performance, they are suitable for high-pressure and high-vibration working conditions, and are easy to install and maintain.
Summary
The core logic of selecting industrial actuated butterfly valves is "actuation method adapts to control requirements, working condition parameters lock in product specifications, and structure and materials ensure stable operation. Only by comprehensively considering the above factors can a cost-effective valve suitable for industrial scenarios be selected.
