The Contest Between Electric and Pneumatic Actuator Butterfly Valves: Choosing Soft Sealing or Solid Strength?

The Contest Between Electric and Pneumatic Actuator Butterfly Valves: Choosing Soft Sealing or Solid Strength?

At the core of industrial wonders, precision pairs with endurance, heralding the unsung heroes: butterfly valves. Not merely ordinary valves, but specifically those that represent innovation and efficiency stand out: soft sealing butterfly valves, electric pneumatic butterfly valves, and pneumatic actuator butterfly valves. Each is vital in industrial fluid control, ensuring seamless, efficient operations. Let’s explore their world, where each turn is critical, and see how they maintain industry’s lifeblood with unparalleled precision and dependability.

Soft Sealing Butterfly Valve: Championing Zero-Leak Operations

The soft sealing butterfly valve excels with its unique sealing method. It features a flexible, soft seat crafted from materials such as EPDM, NBR, or PTFE. Its design shines in tight-sealing applications, crucial for preventing leaks of fluids or gases.

In What Applications Does the Soft Sealing Butterfly Valve’s Design Excel?

Soft sealing butterfly valves shine in applications demanding tight closure, low leakage, and careful handling of sensitive fluids. Here’s where they stand out:

  1. Hygienic and Pharmaceutical: Using FDA-approved materials, they ensure cleanliness and resist chemicals.
  2. Chemical Processing: They withstand corrosive substances, ensuring containment and preventing cross-contamination.
  3. Water Treatment: They’re effective in treatment and HVAC systems, offering leak-tightness across various conditions.
  4. Pulp and Paper: Ideal for abrasive fluids, they provide durable shutoff, cutting maintenance costs and downtime.
  5. Food and Beverage: They protect food safety by blocking contaminants and reducing product loss during processing.
  6. Power and HVAC: Handling high temperatures and pressures, they’re used in steam and cooling systems with minimal leakage.
  7. Marine and Offshore: Their robust design suits harsh marine environments, resisting corrosion from saltwater.

Electric Pneumatic Butterfly Valves: Innovation Meets Control

Electric pneumatic butterfly valves merge the precision of electric actuators with pneumatic efficiency. They’re fitted with an electric motor that moves the actuator, thereby adjusting the valve disc’s position. Precise control is enabled by the electric actuator, crucial for processes requiring consistent flow rate adjustments.

How Do Electric Pneumatic Butterfly Valves Offer Accurate Control and the Convenience of Remote Operations?

Electric pneumatic butterfly valves present a formidable combination of precise control mechanisms and the convenience of remote operation capabilities.   These two features are central to their appeal in automated industrial systems:

Accurate Control

  • Precision Positioning: Electric actuators are known for their ability to accurately position the valve disk to control the flow rate through a pipeline.   They can modulate the valve’s opening to very fine degrees, allowing for granular control over the process media’s movement.   This precision is especially crucial in applications where the exact flow rate must be maintained to ensure process quality, such as in chemical dosing or temperature regulation in HVAC systems.
  • Modulation Capability: Unlike manual or solely pneumatic solutions, electric actuators can precisely modulate the valve position based on feedback from sensors in the system.   This feedback loop ensures the valve can adjust to changes in the process conditions in real-time, optimizing the flow and pressure conditions as required.

Convenience of Remote Operations

  • Electric actuators integrate smoothly with digital control systems, like PLCs and DCS. This integration enables remote valve control, adjusting flow from afar. It allows for management without physical presence at the valve site.
  • Electric pneumatic butterfly valves support real-time monitoring and data logging through control system interfaces. They enable continuous tracking of valve and process performance, sending alerts for anomalies and logging data for analysis. This aids in predictive maintenance, allows remote management, enhances efficiency, and reduces manual inspections.

Electric pneumatic butterfly valves

Pneumatic Actuator Butterfly Valves: The Power of Air Pressure

When speed and toughness in tough environments are essential, pneumatic actuator butterfly valves stand out. By using compressed air for movement, these valves guarantee strong performance, particularly in settings with high flow rates and corrosive substances.

Pneumatic actuators are favored in places with ignition risks, as they operate without electricity and are naturally explosion-proof. Furthermore, their straightforward design typically leads to reduced maintenance expenses and a prolonged lifespan. These valves are frequently used in chemical processing, the petrochemical industry, and bulk material handling.

What Are the Advantages of Pneumatic Actuators Over Other Types of Actuators?

Pneumatic actuators boast several notable benefits over their electric counterparts:

Strong Environmental Adaptability:

  • Explosion-proof Safety: Suited for flammable and explosive environments, they work with air, reducing spark risks and meeting strict explosion-proof standards.
  • Resilience to Harsh Conditions: More reliable and durable than hydraulic, electronic, and electrical controls in dusty, magnetic, radioactive, and vibrating conditions, they’re less affected by external factors.

Fast Response and High Dynamic Performance:

  • Quick Action: They respond swiftly to control signals, excelling in applications requiring frequent or emergency shutoff.
  • High Acceleration: They often achieve higher acceleration than electric actuators, reaching desired speeds and pressures quickly.

Strong Overload Capacity:

  • Maintenance-free: Designed for no maintenance, they don’t need oil changes or extra lubrication, with a life expectancy of up to one million cycles.
  • Adjustable Torque: By adjusting air pressure, their working pressure and output torque can be easily increased, handling overload situations well, especially when valves face increased startup torque due to deposits or sintering.

Economic and System Simplification:

  • Cost-effective: For on/off or manual valve operations, like in water and wastewater treatment, they offer economic benefits due to low cost, simple structure, and less assembly complexity.
  • Reduced Monitoring and Control Needs: Compared to electric actuators, they only require basic end position sensing and air source treatment, eliminating the need for complex monitoring like over-temperature, torque, or frequency conversion, thus simplifying the overall system.

The triad of soft sealing, electric pneumatic, and pneumatic actuator butterfly valves introduces a suite of forward-thinking solutions tailored to meet the varied demands of modern industrial endeavours.  By offering distinctive advantages in seal integrity, control sophistication, and operation speed, these valves empower professionals to refine process management, elevate operational efficacy, and guarantee safety in myriad applications. Please contact us if you are interested. We look forward to hearing from you.

What are Pneumatic Actuator Butterfly Valves and Electric Pneumatic Butterfly Valves?

What are Pneumatic Actuator Butterfly Valves and Electric Pneumatic Butterfly Valves?

Both pneumatic actuator butterfly valves and electric pneumatic butterfly valves present distinct benefits concerning control, velocity, and cost-effectiveness. Pneumatic variants, renowned for their automated actuation, are extensively employed across diverse industries. Conversely, electric actuators afford meticulous control tailored to particular applications.

pneumatic actuator butterfly valve

Pneumatic Actuator Butterfly Valves

Pneumatic butterfly valves are essential components in various industrial applications where precise fluid flow control is crucial. Here’s what you need to know:

Working Principle:

A pneumatic butterfly valve comprises a central disc nestled between a stem and a pipe. The stem links to a pneumatic actuator powered by compressed air, propelling either a diaphragm or piston. By rotating the stem 90 degrees, the actuator positions the disc parallel to the fluid flow, facilitating seamless passage through the valve. Rotating the stem partially enables proportional or throttled flow, making these valves suitable for modulating services.

Types and Applications:

  • Concentric Type: These valves have a concentric disc closure design.
  • Eccentric Type: Eccentric butterfly valves are also common.
  • Connection Varieties: Valves are available in wafer-style, lug-style, or flanged designs.
  • Utilizations: Pneumatic butterfly valves are applied across a spectrum of industries, encompassing chemical processing, water treatment, and HVAC systems.


  • Fast Response: Pneumatic actuators can quickly open or close the valve, making them suitable for applications requiring rapid adjustments.
  • Cost-Effective: Pneumatic systems are generally more affordable than electric ones.
  • Simple Design: These valves have fewer components, making maintenance and installation straightforward.
  • High Pressure Handling: Pneumatic actuators can handle high-pressure environments effectively.


  • Air Supply Dependency: Pneumatic valves rely on a continuous supply of compressed air. Any interruption can affect their operation.
  • Restricted Accuracy: Attaining meticulous control or exact positioning can pose difficulties owing to the discrete manner of pneumatic actuation.
  • Audible Disturbance and Vibrations: Operational noise and vibrations may arise from pneumatic systems.
  • Increased Dimensions: Pneumatic actuators typically exhibit larger physical profiles in contrast to their electric counterparts.

electric pneumatic butterfly valves

Electric Pneumatic Butterfly Valves

Electric butterfly valves combine the benefits of both electric and pneumatic actuators. Here’s a brief comparison:

Electric Actuators:

Utilize electrical power for precise control and automation.

Ideal for applications requiring accuracy.

Slower response time compared to pneumatic actuators.

Pneumatic Actuators:

Use compressed air or gas for actuation.

Faster response time.

Commonly used for larger valves due to cost-effectiveness.


  • Accurate Management: Electric actuators enable precise adjustment and meticulous control over valve opening and closing.
  • Streamlined Processes: Electric valves seamlessly integrate into automated setups, minimizing the requirement for manual intervention.
  • Independence from Air Supply: Electric actuators operate autonomously without dependence on external air sources, circumventing concerns related to air supply.
  • Quiet Operation: Electric systems operate quietly without the noise associated with compressed air.


  • Slower Response: Electric actuators are generally slower to respond compared to pneumatic ones.
  • Higher Cost: Electric systems tend to be more expensive upfront.
  • Complexity: Electric actuators have more components, which can increase maintenance complexity.
  • Limited Pressure Handling: Electric actuators may not handle extremely high pressures as effectively as pneumatic ones.

In summary, choose based on your specific application requirements. Pneumatic actuators excel in speed and cost-effectiveness, while electric actuators offer precision and automation capabilities. TWT Valve is a professional manufacturer from China can produce pneumatic actuator butterfly valve, electric pneumatic butterfly valves, and ductile iron wafer butterfly valve.

Different Butterfly Valves Include Pneumatic, Electric And Manual

Different Butterfly Valves Include Pneumatic, Electric And Manual

Butterfly valves are essential components in industrial applications, offering efficient flow control. Choosing the right type of butterfly valve depends on various factors. These factors or saying features include the desired driving mode, working pressure, working temperature and structural features. Firstly, Pneumatic actuator butterfly valve offer reliability and versatility, with the choice between wafer and flanged designs. Meanwhile, electric butterfly valve provide automated operation and precise control, making them suitable for a wide temperature range. In addition, Manual butterfly valves offer simplicity and cost-effectiveness, ideal for low-pressure applications. Consider your specific requirements and application needs to select the most suitable butterfly valve type for your industrial processes.

I. Pneumatic Actuator Butterfly Valve: Reliable and Versatile

Characteristic: Wafer or Flanged Butterfly Valve

  • Pneumatic actuator butterfly valves can be either wafer or flanged in design.
  • The choice between the two depends on the specific application and installation requirements.

Work Pressure: Mid-Pressure (2.5MPa < Pn < 6.4MPa)

Pneumatic actuator butterfly valves are designed to handle mid-pressure applications. So it provides reliable performance and efficient flow control.

II. Electric Butterfly Valve: Automated and Precise

Driving Mode: Electric

  • Electric butterfly valves are powered by electric actuators.So, It enables automated operation and precise control over fluid flow.
  • This driving mode eliminates the need for manual intervention. This isideal for applications requiring remote control or frequent adjustments.

Working Temperature: Normal Temperature (-40°C < T < 120°C)

Electric butterfly valves can operate within a wide temperature range, from -40°C to 120°C. Meanwhile, wide range of working temperature makes them suitable for both hot and cold applications.

Structure: Double-Eccentric Sealing

  • Electric butterfly valves feature a double-eccentric sealing structure, which enhances sealing performance and reduces wear and tear on the valve seat.
  • This design ensures tight shut-off and minimizes the risk of leakage.

III. Manual Butterfly Valve: Simple and Cost-Effective

Driving Mode: Manual

Manual butterfly valves are operated manually, either through a lever or a handwheel.

This driving mode offers simplicity and cost-effectiveness, making them suitable for applications where automation is not required.

Structure: Center Sealing

Manual butterfly valve typically feature a center sealing structure, providing reliable sealing performance and ease of operation.

Work Pressure: Low Pressure

Manual butterfly valves are designed for low-pressure applications, offering economical flow control solutions.

Stem Material: Stainless Steel

The stem of manual butterfly valves is commonly made of stainless steel, ensuring durability and resistance to corrosion.

The large system of butterfly valves and gate valves is indispensable in industry

The large system of butterfly valves and gate valves is indispensable in industry

Butterfly valve is a valve that uses a circular disc as a opening and closing part and rotates with the valve stem to open, close and adjust the fluid channel. The disc of the butterfly valve is installed in the diameter direction of the pipe. Earlier applications began with the air volume regulation baffle on the flue or chimney, and were also used in low-pressure systems such as ventilation or gas supply. In recent years, the metal seal butterfly valve has developed rapidly, with the application of high temperature resistance, low temperature resistance, strong corrosion resistance, strong erosion resistance, high strength alloy materials in the butterfly valve, so that the metal seal butterfly valve has been widely used in high temperature, low temperature, strong erosion and other working conditions, and partially replaced the globe valve, gate valve and ball valve.

There are many types of butterfly valves, among which the most common classification method is according to the structural form (the position of the rotating center line of the valve stem is different), which can be divided into the following four kinds:

In addition, there are many other ways to classify butterfly valves.

Butterfly valve drive mode classification

Pneumatic actuator butterfly valve

The pneumatic actuator butterfly valve is composed of a pneumatic actuator and a butterfly valve. The pneumatic butterfly valve is opened and closed with the circular butterfly plate rotating with the valve stem, and the pneumatic valve that has been switched is mainly used as a cut-off valve, which can be used as a switch and adjustment application. Now the butterfly valve is more and more applied in high pressure large and medium diameter pipelines.

Electric actuator butterfly valve

The electric butterfly valve is driven by an electric actuator, and the working power supply is usually: AC220V, AC380V, etc. Input signal: 4~20mA 0~10v and other weak signals. After the regulating electric actuator and valve stem are installed and adjusted, the butterfly valve plate is driven by electric energy as the driving force to make a partial reverse rotation movement of 0~90°. Receive the 4~20mA signal of the industrial automation control system to accurately control the valve switching degree, so as to achieve the adjustment and control of different demand parameters such as flow, temperature, pressure, etc.

Manual butterfly valve

Manual butterfly valve is a traditional, no mechanized improvement, the need for manual operation of the butterfly valve, although the degree of automation is low, but still plays a relatively large role in the industrial field.

Gate valves also come in many varieties

Like the butterfly valve, the gate valve as a switch valve, there are many classifications. For example:

According to the lifting mode of the stem, the gate valve can be divided into rising stem resilient seated gate valve and non rising stem resilient seated gate valve.

The stem of the non rising stem resilient seated gate valve only rotates and does not move up and down, and only one valve stem of non rising stem resilient seated gate valve is exposed. Its nut is fixed on the gate, through the rotation of the stem to lift the gate, so you can not see the door frame; The stem of the rising stem resilient seated gate valve is exposed, and the nut is fixed tightly to the handwheel (no rotation, no axial movement). By rotating the stem to lift the gate, the stem and gate only have relative rotation movement, there is no relative axial displacement, and the appearance is a portal bracket.

China high quality butterfly and gate vales here

TWT is a professional valve manufacturer in China, known for high quality and excellent service, all kinds of valves we have professional production lines to ensure to meet your needs. In this article, we briefly mentioned several commonly used butterfly valves and gate valves, which are also part of our main products. You are welcome to continue browsing our website for more information.