Exploring 4 Different Actuation Methods for Butterfly Valves

Butterfly valves are indispensable in controlling fluid flow across various industries, from oil and gas to water treatment. However, their versatility largely depends on the actuation method used. In turn, it determines how the valve opens and closes.

This article explores the four main actuation methods for butterfly valves: manual butterfly valves, electric butterfly valves, motorized butterfly valves, and pneumatic butterfly valves. Keep on reading and learn how these actuation methods work. By the end of this blog, you will be able to choose rightly which butterfly valve works for your business.

What Are the Different Actuation Methods for Butterfly Valves?

Butterfly valves can be actuated in various ways depending on the application’s complexity, automation requirements, and operating environment. Actuation methods include:

Manual Butterfly Valve

A manual butterfly valve is the simplest form of actuation. It is designed to be operated by hand using a lever or a gear mechanism. In this setup, the lever directly rotates the valve disc within the pipeline, allowing for basic flow control.

For larger or high-torque valves, a gear mechanism is often added. This reduces the physical effort required to operate the valve manually.

Key Features and Benefits:

• Cost-Effectiveness: Manual butterfly valves are highly economical. This is because they do not require external power sources. Thus, manual butterfly valves are a practical choice for smaller-scale systems.
• Ease of Use: With straightforward mechanics, manual valves are easy to install, operate, and maintain.
• Reliability: Their design simplicity ensures reliable operation without the risks of power failure or mechanical complexity.

Electric Butterfly Valve

An electric butterfly valve is actuated using an electric motor. This component drives the rotation of the valve disc. The motor is controlled by electrical signals, allowing for remote and automated operation.

Electric actuators can be integrated into digital control systems. This feature offers precise regulation of flow and pressure in complex industrial applications.

Key Features and Benefits:

• Automation Capabilities: Electric butterfly valves can be programmed for automated processes. This quality eliminates the need for manual operation.
• Precision Control: These valves’ positioning can be fine-tuned. It ensures precise flow adjustments, making them suitable for applications requiring accurate process control.
• Versatility: Compatible with various control interfaces, such as PLCs (Programmable Logic Controllers), SCADA systems, and IoT-enabled devices.

Limitations

• Power Dependency: Electric valves require a consistent power source, which can be a drawback in areas with unstable electricity.
• Higher Initial Cost: The upfront investment for electric actuators and associated control systems is higher compared to manual valves.

Motorized Butterfly Valve

The motorized butterfly valve is a specialized version of the electric butterfly valve. Unlike basic electric valves, motorized butterfly valves offer additional functionalities. These are variable speed controls, torque settings, and position feedback mechanisms.

Key Features and Benefits:

• Advanced Customization: Motorized butterfly valves can be tailored to specific operational requirements. Examples are adjusting the flow rates dynamically or operating in multi-turn applications.
• High Precision: They provide finer control over the valve’s opening and closing positions. Thus, they are ideal for critical processes.
• Energy Efficiency: Modern motorized valves are designed to optimize energy consumption, reducing operating costs over time.

Limitations

• Complex Installation: These valves require skilled personnel for setup and calibration, increasing installation time and cost.
• Cost Consideration: The additional features and components result in a higher price point compared to standard electric valves.

Pneumatic Butterfly Valve

A pneumatic butterfly valve operates using compressed air or gas to actuate the valve’s movement. The air pressure drives a piston or diaphragm within the actuator. The latter then rotates the valve disc to control the flow of the medium. Pneumatic actuation is known for its speed and reliability, particularly in demanding industrial environments.

Key Features and Benefits:

• Rapid Response: Pneumatic butterfly valves excel in applications requiring quick opening and closing, such as emergency shutoff systems.
• Explosion-Proof Operation: Unlike electric actuators, pneumatic actuators do not pose a risk of sparks, making them ideal for hazardous environments like oil refineries or chemical plants.
• Durability: Pneumatic valves are robust and capable of withstanding high pressures and harsh conditions.

Limitations

• Air Supply Dependency: A reliable compressed air or gas supply is essential for operation, which can add complexity to the system.
• Maintenance Requirements: The air system and actuator components require regular inspection and upkeep to ensure optimal performance.

Comparing the Actuation Methods

Factors to Consider for Choosing the Right Actuation Method

1. Cycling Requirements

For frequent cycling, pneumatic or motorized butterfly valves are ideal due to their speed and durability.

2. Actuator Speed

Processes requiring rapid actuation, such as emergency shutoffs, benefit from pneumatic butterfly valves.

3. Nature of the Working Media

Electric and motorized butterfly valves excel in applications involving corrosive or hazardous media due to their precision and reduced risk of leaks.

4. Redundancy and Safety

Pneumatic butterfly valves provide reliable operation in safety-critical environments, such as oil refineries or chemical plants.

5. Cost and Maintenance

For budget-conscious applications, manual butterfly valves are suitable. However, for reduced long-term costs, electric or motorized butterfly valves may be better choices.

Partner with Gowin Valves for Your Butterfly Valve Requirements

When it comes to high-quality butterfly valves, Gowin is the trusted name that stands above the rest. Since 2007, Gowin has been at the forefront of valve manufacturing. The company delivers innovative solutions to industries worldwide, including oil and gas, chemical processing, metallurgy, power generation, and water supply systems.

Gowin butterfly valves are meticulously engineered to meet the diverse demands of modern industries. Their certifications include ISO9001 and ISO14001 standards. They are also compliant with industry-specific certifications like API6D, API607, and OHSAS45001. In turn, Gowin valves exemplify durability, reliability, and performance excellence. 

References:

Handbook of Valves and Actuators by Brian Nesbitt, 2007 (https://www.sciencedirect.com/book/9781856174947/handbook-of-valves-and-actuators)

Surface Production Operations Volume 3: Facility Piping and Pipeline System by Maurice Stewart, 2016 (https://www.sciencedirect.com/book/9781856178082/surface-production-operations)