Difference between Double Offset and Triple Offset Butterfly Valve
10 Jun,2022

A butterfly valve is a common type of industrial valve. It uses a butterfly-like round disc to control the flow. A butterfly valve is able to control liquid flow through a pipe without any significant impact on the other side. 

A butterfly valve is designed to be a highly efficient option when controlling flow through a pipeline, which saves both time and money. Its benefits make it a highly preferred choice in many applications.

There are different types of butterfly valves available in the market. The two most common types are double offset and triple offset butterfly valves. The main difference between a double-offset and a triple-offset butterfly valve is their structure. In double-offset models, the stem and disc deviate from their center. This results in less scraping and over-compression, which increases the valve’s lifetime. 

If you want to know more about the difference between double offset and triple offset butterfly valves, continue reading this article. 

What is Double Offset Butterfly Valve?

A double offset butterfly valve is characterized by two counterbalance contrasts. The first offset is near the center of the valve body, where the stem attaches. This offset allows the valve to seal without any friction, while the second offset allows the valve to open with minimal friction. This means that it can be used for a variety of applications. 

A double offset butterfly valve differs from a symmetric butterfly valve in two major ways. The first is the disc itself. The disc is shaped like an oval, while the second is parallel to the flow. The disc is also deformed in a unique way. Its asymmetric shape enables it to reduce pressure loss while reducing seat wear. In addition, it is able to accommodate multiple operating modes.

What is Triple Offset Butterfly Valve?

The triple name offset indicates that the disc is not vertically centered and slopes up and down. As a result, it appears to be off-balance. The stem connects the disc to the valve body and, in turn, creates a third offset, which is the stem’s thickness from the flat side to a rounded tip. Because of this, the triple offset butterfly valve has a lower maximum capacity than a flat disc valve.

The triple offset butterfly valve is an effective, high-pressure valve that has many benefits. Its design features a metal-to-metal sealing arrangement that virtually eliminates disc-to-seat rubbing, which causes wear and a shorter life span. A triple offset butterfly valve is a high-performance valve that closes with zero leakage. The offset angle eliminates rubbing between the seat ring and the seal, which results in a repeatable, zero leak shutoff. 

Difference between Double Offset and Triple Offset Butterfly Valve

The main difference between double offset and triple offset butterfly valves is in the seat material. While double offset valves have soft seating material, triple offset comes with a metal seat. Another difference is pressure sensitivity and temperature fluctuations. Double offset valves are sensitive to pressure and temperature, but triple offset valves are not sensitive.

The Double Offset Butterfly Valve is better suited for bubble-tight sealing, while the triple offset butterfly valve is better suited for high temperatures, high pressure, and abrasive media. In addition, this valve has a high sealing surface and requires less maintenance. It also offers longer life than the double offset butterfly valve, which makes it ideal for applications involving high temperatures or corrosive media.

The differences between the double offset butterfly and the triple offset butterfly valve are significant. In addition, the metal seats of triple-offset valves can accommodate higher pressures than double-offset versions and require less torque. While the double-flanged butterfly valves are less expensive than triple-offset varieties, they are not ideal for high-pressure applications and unusual materials. 

Double offset valves have low seat friction, whereas triple offset valves have very low friction. The seat is triple offset valves last longer than the double offset seat. Triple offset valves are often used in severe and critical applications, while double offset valves are used for on, off, and throttling functions.

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