What Is a Wafer Type Electric Actuated Butterfly Valve?

Among the valve types used for fluid control in mechanical installations, HVAC systems, industrial process lines, water distribution systems and treatment applications, the wafer type electric actuated butterfly valve holds a very important place. Especially in large and medium diameter pipelines, when compact installation, an economical solution and automation compatibility are required, these products are frequently preferred.

Today users frequently search for questions like these in search engines: «What is a wafer type butterfly valve?» «What does a wafer type electric actuated butterfly valve do?» «What is the difference between wafer type and lug type butterfly valves?» «Where is an electric wafer type valve used?» «How does a motorized wafer butterfly valve work?» «Why is a wafer type butterfly valve preferred in HVAC systems?» «What are the advantages of a wafer type butterfly valve?»

All of these questions arise from the need to select the right valve type. Because in many projects, simply saying “butterfly valve” is not enough; the connection form, actuator type and operating condition are also very important.

In this article we will address in detail the questions «what is a wafer type electric actuated butterfly valve, how does it work, where is it used, in which lines is it preferred and what should be considered when buying». At the same time we will explain frequently searched concepts: wafer type butterfly valve, motorized wafer valve, electric actuated butterfly valve, DN100 wafer butterfly valve, HVAC butterfly valve, on/off butterfly valve, modulating butterfly valve, wafer connection type valve will also be clearly explained.

What Is a Wafer Type Electric Actuated Butterfly Valve?

A wafer type electric actuated butterfly valve is a valve system in which the wafer type butterfly valve body, mounted by being clamped between two flanges, is opened and closed automatically with the help of an electrically driven actuator.

The two most important elements within this definition are:

1. Wafer type butterfly valve

The expression “wafer type” describes the connection form of the valve. This valve is placed between two flanges in the pipeline and mounted by being clamped with bolts.

2. Electric actuator

It is the mechanism that turns the disc on the butterfly valve with an electric motor instead of a manual lever. Thus the valve can be opened and closed remotely, or in some models brought to certain intermediate positions.

So the logic of the product is: «Wafer type body + butterfly disc + electric actuator = wafer type electric actuated butterfly valve»

This product may also be known in the field by the following names:

• wafer type motorized butterfly valve
• electric wafer type butterfly valve
• wafer type actuated valve
• motorized wafer valve
• electric actuated butterfly valve
• automatic wafer butterfly valve

What Does Wafer Type Mean?

The expression “wafer type” describes how the valve is connected to the pipeline. In this connection type, the valve is placed between two flanges and clamped into the line with the flange bolts.

Thanks to this structure, the valve is:

• more compact
• lighter
• more economical
• and takes up less space in the installation area

Especially in HVAC systems, water installations, treatment lines and industrial auxiliary processes, the wafer type butterfly valve is very widely used.

The wafer type structure keeps the valve body slim in the middle of the line. That is why it stands out as a practical solution especially in medium and large diameter lines.

How Does a Wafer Type Electric Actuated Butterfly Valve Work?

The operating logic of this product is quite clear. Inside the valve body there is a circular disc. This disc is connected to the valve shaft. When the electric actuator operates, it turns this shaft and the disc moves.

In the open position:

The disc becomes parallel to the flow direction. The fluid passes easily through the line.

In the closed position:

The disc cuts off the flow path. The flow stops.

In the intermediate position:

In modulating models, the disc can be held at a certain angle. Thus the flow is partially controlled.

In the system, the control signal can come from the following sources:

• building automation system
• PLC
• temperature controller
• pressure controller
• remote control panel
• time relay
• process management system

In this way the wafer type electric actuated butterfly valve is no longer just equipment that opens and closes manually; it becomes a professional control element compatible with automation.

Is There a Difference Between a Wafer Type Butterfly Valve and a Normal Butterfly Valve?

An important point needs to be clarified here: there is no single standard type called a “normal butterfly valve”. Butterfly valves are divided into different groups according to their connection structure. The most common ones are:

• wafer type butterfly valve
• lug type butterfly valve
• flanged type butterfly valve

So the wafer type valve is actually a subtype of the butterfly valve. The difference does not appear in the working logic of the disc, but in how it is connected to the pipeline.

Where Is a Wafer Type Electric Actuated Butterfly Valve Used?

These products have a very wide range of use. They stand out especially in systems that require a compact structure, large diameter compatibility and automation integration.

1. Use in HVAC Systems

In heating, cooling and ventilation systems, wafer type electric actuated butterfly valves are frequently used for main line control.

Usage examples:

• chiller water lines
• boiler room circuits
• air handling unit supply lines
• hot and cold water main risers
• distribution manifolds
• pump lines

On the HVAC side, in many applications of DN50 and above, the wafer type butterfly valve is a very sensible choice.

2. Use in Chiller and Cooling Water Lines

In chiller systems, the wafer type motorized butterfly valve is preferred to open and close, isolate or include large diameter pipelines in automation scenarios.

Advantages:

• compact installation
• low weight
• main line isolation
• integration into automation
• easy operation scenario during maintenance

3. Use in the Boiler Room and Heating Installation

In the boiler room, the wafer type electric actuated butterfly valve can be used in the main distribution lines, in zone separation, in manifold lines and for isolation purposes.

Especially in large mechanical rooms, it provides advantages for the following reasons:

• economical solution in large diameter lines
• fast intervention with electric control
• central operating convenience
• on/off automation of the main line

4. Use in Water Distribution and General Installation Lines

In building water distribution systems, in storage tank lines, in technical spaces and in general service lines, the wafer type butterfly valve provides a significant advantage.

Usage examples:

• water tank main lines
• transfer pump outlet lines
• technical service water circuits
• auxiliary installation distribution lines

5. Use in Water Treatment and Filtration Systems

In treatment systems, the wafer type butterfly valve is used a lot especially in medium and large diameter lines. The reason is the advantage of compact structure and economical installation.

Areas of use:

• raw water inlet lines
• filter inlets and outlets
• backwash lines
• process water transfer circuits
• storage tank main lines
• RO pre-treatment distribution lines

In the treatment sector, correct material selection is very important. The seal and body structure must be carefully selected according to the fluid.

6. Use in Industrial Process Lines

In industrial facilities, the wafer type electric actuated butterfly valve is frequently preferred in water, process liquid, auxiliary fluid or cooling water lines.

Why is it used?

• suitable for medium and large diameters
• practical at large flow rates
• easy to integrate into automation
• provides advantages in maintenance and operation

7. Use in Fire and Auxiliary Safety Lines

In some projects, the use of the wafer type butterfly valve can also be seen in fire water or auxiliary safety lines. However, in such applications the relevant standards, certification requirements and project specification must definitely be taken into account.

What Are the Advantages of a Wafer Type Electric Actuated Butterfly Valve?

The main reason this product is so widespread in the market is the strong advantages it offers.

1. Compact Installation Structure

Thanks to the wafer type structure, the valve sits between two flanges and takes up less space. This provides a great advantage especially in narrow mechanical rooms and cramped piping areas.

2. Lighter Body

Compared to flanged or heavier type butterfly valves, many wafer type solutions are lighter. This provides ease of installation and transport.

3. Economical Solution

Wafer type butterfly valves offer a cost-effective automation solution in most projects. At medium and large diameters, the price/performance balance is quite good.

4. Ease of Use at Large Diameters

It is a practical solution for automatic control at diameters of DN50, DN65, DN80, DN100, DN125, DN150 and above.

5. Automation Compatible Structure

Thanks to the electric actuator, it can be easily integrated with building automation, a PLC or a control panel.

6. Fast Opening and Closing

It enables the main lines to be opened and closed quickly. This creates advantages in maintenance, isolation and operation management.

7. Low Space Requirement

The short installation length, compact valve body and slim structure provide a serious advantage especially in technical spaces.

What Is the Difference Between a Wafer Type and a Lug Type Butterfly Valve?

This is also one of the topics users research the most. Both types belong to the butterfly valve family; however, their connection structure and application advantages are different.

Wafer Type Butterfly Valve

• is clamped between two flanges
• has a more compact structure
• is generally more economical
• is very common in many HVAC and water lines

Lug Type Butterfly Valve

• has threaded lugs on its body
• the bolts can be attached individually to the body
• can provide advantages in some maintenance and line separation applications
• in certain scenarios, separating one side of the line can be more controlled

In summary:

• «Wafer type for the general and economical solution»
• «Lug type for certain maintenance and line separation scenarios»

stands out more.

What Is the Difference Between a Wafer Type and a Flanged Butterfly Valve?

Flanged type butterfly valves can be heavier and larger in structure. They are preferred in some industrial or heavy-duty applications. The wafer type, on the other hand, is more compact and often more economical.

Advantage of the wafer type:

• lighter
• takes up less space
• more economical
• common in HVAC and general water applications

Advantage of the flanged type:

• may be more suitable in some heavy-duty applications
• may be preferred for special project requirements

How Is a Wafer Type Electric Actuated Butterfly Valve Selected?

If the selection is not made correctly, the valve performance decreases, the actuator is strained or the system does not work as desired. Therefore the following criteria must be carefully evaluated.

1. Nominal Diameter

The diameter information such as DN50, DN65, DN80, DN100, DN125, DN150 must be determined correctly.

2. Pressure Class

The pressure class such as PN10, PN16 must be suitable for the system conditions.

3. Fluid Type

Information such as water, hot water, cold water, glycol, process liquid or chemical auxiliary fluid is decisive in the selection.

4. Temperature Value

The seal and body material must be selected accordingly.

5. Control Type

• on/off?
• modulating?
• 3-point control?

6. Actuator Voltage

A supply voltage suitable for the field, such as 24V or 230V, must be determined.

7. Torque Requirement

The actuator must have sufficient torque to turn the valve shaft.

8. Connection Standard

The compatibility of the flange standard in the line with the wafer type valve must be checked.

9. Automation Compatibility

It must be compatible with BMS, PLC, control panel or field automation system.

10. Ambient Conditions

Humidity, outdoor environment, water splash, dust and temperature conditions must be taken into account.

What Should Be Considered When Buying a Wafer Type Electric Actuated Butterfly Valve?

On the purchasing side, looking only at the valve diameter is a big mistake. The following details must be evaluated together:

• purpose of use
• fluid type
• operating temperature
• pressure level
• whether it will operate continuously or periodically
• automation requirement
• body material
• disc material
• sealing element
• actuator quality
• IP protection level
• maintenance and service support
• brand reliability

Especially in water treatment and industrial applications, material selection is of critical importance.

Why Do Faults Occur in a Wafer Type Electric Actuated Butterfly Valve?

The main faults that can be seen in these products are:

1. Wrong Torque Selection

If the actuator cannot turn the valve easily, straining and failure occur over time.

2. Incorrect Wiring

Due to incorrect connection, the valve may not open or close.

3. Wrong Voltage

Using 230V instead of 24V or vice versa can cause serious damage.

4. Mechanical Jamming

Jamming can occur in valves that do not move for a long time or are exposed to dirty fluid.

5. Unsuitable Ambient Conditions

The risk of failure increases in actuators without sufficient protection in humid or outdoor environments.

6. Wrong Material Selection

If the seal or body structure is not suitable for the fluid, early deformation may occur.

What Is the Difference Between On/Off and Modulation in a Wafer Type Electric Actuated Butterfly Valve?

On/Off Type

The valve operates either fully open or fully closed. It is suitable for main line isolation and simple on/off applications.

Modulating Type

The valve can be brought to intermediate positions. It can be used for flow control or more sensitive process applications.

In many HVAC main line applications, on/off solutions are sufficient. However, where process control or fine flow adjustment is required, a modulating solution may be more appropriate.

In Which Diameters Is It More Often Preferred?

Wafer type electric actuated butterfly valves are especially very common in the following diameters:

• DN50
• DN65
• DN80
• DN100
• DN125
• DN150
• DN200
• DN250
• DN300

As the diameter increases, the advantage of using a butterfly valve becomes even more evident.