Hard-sealed butterfly Valves are used for heating pipes
Oct 27,2021 Posted by Bundor
Is it possible to use hard-sealed butterfly Valves for heating pipes? In this article, the editor of Bundor Valve will give you an introduction.
The weather is getting colder, and the northern area has gradually started heating. In the heating pipeline, various Valves are inseparable to control and adjust the flow. Is it possible to use hard-sealed butterfly Valves for the heating pipeline? In this article, the editor of Bundor Valve will give you an introduction.
The hard-sealed butterfly Valve we usually see is basically a triple eccentric butterfly Valve. The so-called "triple eccentric" refers to the deviation of the relative position of the Valve shaft and the Valve plate in the Valve. Ordinary butterfly Valves are all eccentric, that is, the center line of the Valve shaft is deviated from the center line of the sealing surface (the center line of the Valve plate); the high-performance double eccentric butterfly Valve has an eccentricity, that is, the center line of the Valve shaft and the center line of the Valve (the center line of the pipeline). ) Deviation; the purpose of double eccentricity is to separate the Valve plate and the sealing pair from each other when the Valve is opened, thereby reducing friction.
The triple eccentric butterfly Valve adds a unique eccentric-oblique cone on the basis of the above double eccentric, that is, the offset of the Valve plate (the sealing surface is inclined at an angle with the vertical surface of the pipeline). In this way, the Valve is completely separated from the sealing pair within the 90° stroke range, and friction is completely eliminated; at the same time, when the Valve is closed, when the sealing pair is gradually closed, a "wedge effect" is produced, and the tightest shut-off is achieved with the smallest torque. .
The triple eccentric butterfly Valve is a metal seal, so it is also called a hard seal butterfly Valve. The so-called "metal seal" means that the Valve seat and sealing ring are made of high-quality alloys that are wear-resistant, corrosion-resistant and high-temperature resistant. At the same time, in order to avoid the sealing ring and the Valve seat Hard to hard, the sealing pair is designed to be in flexible contact, that is, an "elastic metal seal" is formed to ensure tight closing and no friction when opening. With the "three eccentric" structure, supplemented by the "elastic metal seal", such a Valve is easy to operate, durable and well sealed.
The triple eccentric metal sealing butterfly Valve can be used on heating pipelines, but more often on the main trunk line and main branch of the heating system. Use on pipes with a diameter of DN300 or more.