Double Eccentric butterfly valve

structure of the double eccentric butterfly valve

Double eccentric butterfly valve is with a wide range of the general applications. This kind of valve is available in cast design as well as fully fabricated design. And it is within the range of the flanged butterfly valve.

The double eccentric butterfly valve incorporates a double offset disc design, which practically eliminates any seat wear. The popularity of the double eccentric butterfly valve may result from the following advantages.

The stainless steel seat ring is elaborately machined in order to ensure the continued tight shut off sealing and to make it an ideal choice for flow isolation and shut off duties. And the double offset disc design ensures minimal seat wear and provides excellent throttling capabilities. And the mechanical stopper on the valve body is adjustable so as to ensure the precise closing of the disc. Besides, both drive end and non drive end shafts are fully blowout proof and guided by self lubricated bush bearings. The axial thrust bearing provided on valve would ensure precise positioning of the disc and prevent unequal loading of the valve seat. It also enables installation of valve in any orientation if required. What else, the special shaft sealing arrangement would ensure zero fugitive emission. Moreover, the available choice of seat materials makes the valve suitable for gas or liquid service with a host of applications.

Double eccentric butterfly valve

Double eccentric butterfly valve is one specified type of the butterfly valve which is classified from the perspective of the various structures. And it is also called the high performance butterfly valve. Generally speaking, the driving modes are in a wide range, such as hand drive, worm wheel and electric, pneumatic and hydraulic ones.

Commonly, it is widely used for the effects affecting by the throttles or the cutting off devices. And it is applicable for the pipe systems for a variety of the industries. With the simple and compact structure, the double eccentric butterfly valve is able to occupy the strong reliability. And the small bulk makes the maintenance convenient. As a result of the specified eccentric structure, the sealing surface can be well protected, leading a longer service life this kind of butterfly valve. And referring to the seal, it should be mentioned that the double eccentric butterfly valve holds good seal reliability so as to reach the seal with no leakage. As a result, it is also applicable for the vacuum conditions. And it should be mentioned that it can be wide applied resulting from the replacement of some components. Therefore, it is appropriate for many mediums like the corrosive and non-corrosive gas, liquid or semi liquids