A pneumatic regulating butterfly valve is a valve in which the valve plate rotates around a fixed axis perpendicular to the passage. It consists of a piston-type double-acting or single-acting (spring-return) pneumatic actuator and a butterfly valve. Structurally, it can be classified into centerline type, eccentric elastic seat sealing type, and three-dimensional eccentric multi-layer elastic sealing type. It belongs to the category of high-performance rotary regulating or shut-off valves.
Equipped with an electro-pneumatic valve positioner or solenoid valve, air filter regulator, and limit switch (valve position feedback device), it can achieve proportional regulation and two-position shut-off control of fluid media in process pipelines, thereby achieving automated control of parameters such as flow rate, pressure, temperature, and liquid level of the fluid media. It is widely applicable to media such as gases, turbid liquids, concentrated slurries, ash powder, and suspended particulate matter.
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Electric Control Butterfly Valve Technical parameters
Design and manufacturing:GB/T 12235, ASME B16.34, IEC 60534
The structural length: GB/T 12221, ASME B16.10
Connection forms:HG/T 20592-20605, GB/T 9112-9124, ASME B16.5
Inspection and test:GB/T 13927, API 598, IEC 60534-4
Caliber:2″ ~ 48″ (DN50 ~ DN1200)
Pressure temporature level:ASME B16.34, GB/T 12224
Drive mode: Electric Actuated
Pressure: up to 300 psi (20 bar)
Electric Control Butterfly Valve Core Structure and Working Principle
Pneumatic Actuator
Double-acting type: Compressed air alternately enters two chambers, driving the piston to reciprocate, which in turn rotates the valve stem and disc from 0° to 90°. Suitable for applications requiring high switching speed and control precision.
Single-acting type (spring return): Compressed air enters only one chamber to drive the disc to open. The spring automatically returns to its original position and closes the valve if the air supply is interrupted. Commonly used in situations requiring fail-safe closure, such as preventing backflow.
Butterfly Valve Body
Valve body: Cylindrical structure, connected to pipes at both ends, forming an internal fluid passage. Materials include carbon steel (WCB), stainless steel (1Cr18Ni9Ti), or corrosion-resistant alloys to suit different media requirements.
Disc disc: Disc-shaped opening and closing element, its diameter matches the inner diameter of the valve body passage. Rotation changes the opening degree of the passage, controlling fluid flow.
Valve seat: Made of synthetic rubber, reinforced polytetrafluoroethylene (PTFE), or a metal hard seal structure to ensure sealing performance. Metal valve seats have a self-compensating function, extending service life.
Accessory System
Valve Positioner: Receives 4-20mA signals to precisely control the butterfly plate opening, achieving proportional flow regulation.
Air Filter and Pressure Regulator: Purifies compressed air and regulates pressure to ensure stable actuator operation.
Solenoid Valve: Enables remote or automatic control of air source switching, improving system automation.
Limit Switch: Provides feedback on valve opening and closing status for interlocking protection or status monitoring.
Electric Control Butterfly Valve Performance Advantages
Fast Response and Precise Control
The pneumatic actuator has a short response time (typically ≤0.5 seconds), and when used with a positioner, it can achieve a flow control accuracy of ±0.5%, meeting high-precision regulation requirements.
A 90° rotation of the disc completes the fully open to fully closed action, with low operating torque and rapid opening and closing.
High Flow Rate and Low Resistance
The streamlined valve body design provides a large effective flow area when fully open, resulting in low fluid resistance (flow resistance coefficient ≤0.1), suitable for high-flow pipelines (DN50~DN1000).
A high rated flow coefficient (e.g., Kv value up to 340 for DN100 valves) allows for reduced valve size and lower system costs.
Corrosion and Wear Resistance
The valve body can be made of stainless steel or corrosion-resistant alloy, suitable for acidic, alkaline, and particulate media (such as mud and fly ash).
The metal hard-seal valve seat is overlaid with hard alloy, providing excellent wear resistance and a lifespan of over 100,000 opening and closing cycles.
Compact Structure and Flexible Installation
Small size and light weight (30%~50% lighter than flanged types of the same diameter), supports wafer or flange connections, requiring minimal installation space.
Configurable with a handwheel mechanism for quick switching between pneumatic and manual operation, facilitating maintenance and emergency operation.
Bidirectional Sealing and Reliable Safety
The metal seat design achieves bidirectional sealing, with a sealing class of II or VI, preventing media leakage.
The single-acting actuator is equipped with a spring return function, automatically closing the valve in case of air supply failure, ensuring system safety.
Electric Control Butterfly Valve Applications
Petrochemical Industry
Feed flow regulation in catalytic cracking units to control reaction temperature and pressure.
Low-pressure steam pipeline control in ethylene units to optimize thermal energy utilization efficiency.
Power Industry
Boiler feedwater flow regulation to maintain stable steam drum water level.
Cooling water circulation system control to prevent equipment overheating and damage.
Metallurgical Industry
Blast furnace gas pipeline shut-off to regulate gas flow to match production needs.
Continuous casting machine cooling water system control to ensure stable billet quality.
Environmental Engineering
Absorbent injection pipeline regulation in desulfurization and denitrification systems to optimize flue gas treatment effects.
Air volume control in aeration tanks of wastewater treatment plants to improve biochemical treatment efficiency.
Central Heating Systems
Hot water circulation pipeline flow regulation to achieve on-demand heating and reduce energy consumption.
Electric Control Butterfly Valve Factory
