Double Offset Butterfly Valve Vs. Triple Offset Butterfly Valve: A Comprehensive Comparison

In the field of industrial valves, butterfly valves are widely used in various industries such as oil and gas, water treatment, chemical processing, etc. Among the different types of butterfly valves, two variants take the lead: double eccentric butterfly valve and triple eccentric butterfly valve. In this comprehensive comparison, we will take a deep look at the design, advantages, disadvantages and applications of these two valves.

Image: https://cdn.globalso.com/zfavalve/double-offset-butterfly-valve-vs-triple-offset-butterfly-valve.jpg

Double Offset butterfly valve

As the name suggests, double offset butterfly valves have two offsets: the first offset is the shaft eccentricity, that is, the offset of the shaft axis from the centerline of the pipeline, and the second offset is the seal eccentricity, that is, the geometry of the valve disc seal. This design has significant advantages and disadvantages.

Image: https://cdn.globalso.com/zfavalve/double-offset-butterfly-valve-design.jpg

Advantages of double eccentric butterfly valve

1. Reduced wear

The purpose of the shaft eccentricity design is to reduce the friction between the valve plate and the valve seat during the opening and closing process, thereby reducing wear and reducing the risk of leakage. It can also extend the life of the butterfly valve and reduce maintenance costs.

2. Enhanced sealing

The second eccentricity makes the sealing surface contact the valve seat only in the final stage of closing, which not only ensures a tight seal, but also effectively controls the medium.

3. Reduced torque

The double offset design reduces the friction coefficient, which reduces the force required to open and close the butterfly valve.

4. Bidirectional sealing

Double eccentric butterfly valves can provide bidirectional sealing, allowing bidirectional flow, and are more convenient to install and use.

Disadvantages of double eccentric butterfly valves:

1. Higher cost

The advanced design and materials of double eccentric butterfly valves generally result in higher manufacturing costs compared to centerline butterfly valves.

2. More water pressure lose

Due to the thicker double eccentric valve plate, protruding valve seat, and narrower passages, the water pressure lose through the butterfly valve may increase.

3. Limited temperature range

Double eccentric butterfly valves may be limited when handling ultra-low temperature or high temperature media because the materials used may not withstand extreme temperatures.

Triple Offset butterfly valve

The triple offset butterfly valve represents a further development of the butterfly valve design with three offsets. On the basis of the double eccentric, the third eccentricity is the offset of the axis compared to the center of the valve body. This innovative design is a unique advantage over the traditional centerline butterfly valve.

Image: https://cdn.globalso.com/zfavalve/triple-offset-butterfly-valve-design.jpg

Advantages of triple eccentric butterfly valves

1. Zero leakage

The unique shape of the sealing element of the triple eccentric butterfly valve eliminates friction and wear, resulting in a tight seal throughout the life of the valve.

2. High temperature and high pressure resistance

Both the all-metal triple eccentric butterfly valve and the multi-layer triple eccentric butterfly valve can handle high temperature and high pressure fluids.

3. Fireproof design

All materials of the triple eccentric butterfly valve can meet strict fireproof standards, making it outstanding in fireproof applications.

4. Low torque and friction

The triple eccentric butterfly valve can further reduce operating torque and friction, thereby achieving smooth operation, reducing torque and extending service life.

5. Wide range of applications

The triple eccentric butterfly valve is suitable for a variety of applications, including oil and gas, petrochemical, power generation and refining industries.

Disadvantages of triple eccentric butterfly valves

1. Higher cost

The triple eccentric butterfly valve tends to have a higher initial manufacturing cost due to its advanced design and structure.

2. Slightly higher head loss

The additional offset in the triple eccentric design may result in slightly higher head loss than the double eccentric valve.

Double eccentric butterfly valve VS triple eccentric butterfly valve

1. Valve seat

The valve seat of a double eccentric butterfly valve is generally embedded in a groove on the valve plate and is made of rubber such as EPDM, so it can achieve an airtight seal, but it is not suitable for ultra-high temperature applications. The valve seat of a triple eccentric butterfly valve is all-metal or multi-layered, so it is more suitable for high temperature or corrosive fluids.

Image: https://cdn.globalso.com/zfavalve/double-offset-butterfly-valve-seat.jpgImage: https://cdn.globalso.com/zfavalve/triple-offset-butterfly-valve-seat.jpg

2. Cost

Whether it is design cost or manufacturing process complexity, triple eccentric butterfly valves are higher than double eccentric butterfly valves. However, the frequency of post-maintenance of triple eccentric valves is lower than that of double eccentric valves.

3. Torque

The original intention of the triple eccentric butterfly valve design is to further reduce wear and friction. Therefore, the torque of the triple eccentric butterfly valve is smaller than that of the double eccentric butterfly valve.

Media Contact
Company Name: Tianjin Zhongfa Valve Co., Ltd.
Email:Send Email [https://www.abnewswire.com/email_contact_us.php?pr=double-offset-butterfly-valve-vs-triple-offset-butterfly-valve-a-comprehensive-comparison]
Phone: +86 13212024235
Address:No.38, Baoyuan Road, Jinnan Economic Development Zone, Jinnan District
City: Tianjin
Country: China
Website: https://www.zfavalve.com/



This release was published on openPR.