What Is The Eccentric Butterfly Valves?

What Is The Eccentric Butterfly Valves?

Butterfly valves have become an indispensable industrial tool. Their compact size, light weight, fast action and low pressure drop make them popular choices; yet too rapid opening may cause choked flow or cavitation problems when closed too tightly resulting in choked flow or cavitation issues. Therefore it is vital to select the appropriate butterfly valve type for your application - this article offers an in-depth understanding of different kinds of butterfly valves available today.

Eccentric butterfly valves feature an innovative structure that sets them apart from conventional butterfly valves, using a torsion seal instead of position seal to withstand high pressure and temperature conditions.

There are various kinds of eccentric butterfly valves. They are classified based on factors like disc closure design, function, connection design, control method (actuation method or actuator speed) and seat material. These valves typically fall into two subtypes: Single eccentric and Double eccentric.

Single eccentric butterfly valves feature a stem that runs behind the disc's centerline, making this style of valve more effective at opening and closing than its competitors. Medium pressure applications also make these models suitable.

Double eccentric butterfly valves feature a stem that deviates from both the center of the disc and body centerline, reducing excess extrusion between valve plate and seat and providing better performance over a longer service life.

This type of valve is often recommended for applications that require frequent on/off regulation of large flow rates, and can accommodate higher operating torques than its single eccentric variant.

These valves feature liners made of various materials depending on their intended use; for instance, PTFE and PFA can often be found used with applications involving chemicals that corrode. Therefore, selecting the appropriate liner material is crucial as this could dramatically impact its lifetime and performance.

To make an informed choice when selecting an eccentric butterfly valve, it's essential to take several factors into account when making your selection. Key factors include pressure and temperature of the medium passing through it as well as its operating conditions such as whether or not it will be used frequently or intermittently. By keeping all this information in mind it will become much simpler to select the appropriate eccentric butterfly valve type for your application.


BR.W71F Series Lined Butterfly Valves