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Main reasons for sealing performance failure of double eccentric butterfly valve

  • Categories:News
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  • Time of issue:2021-10-09 13:48
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(Summary description)Double eccentric butterfly valve is usually called high-performance butterfly valve. It is further improved on the basis of single eccentric butterfly valve. It is a widely used butterfly valve at present. Structural features of double eccentric butterfly valve: the rotation center of the valve plate (i.e. the center of the valve shaft) forms a dimensional offset with the sealing section of the valve plate and the centerline of the valve body. Sealing principle of double eccentric butterfly valve: Based on the single eccentric sealing butterfly valve, the rotation center of the valve plate (i.e. the center of the valve shaft) deviates from the center line of the valve body. When the double eccentric sealing butterfly valve is fully opened, the sealing surface of the valve plate will be completely separated from the sealing surface of the valve seat, forming a gap greater than the single eccentric gap between the sealing surface of the valve plate and the sealing surface of the valve seat, So as to reduce the gap between the two sealing surfaces of the double eccentric butterfly valve sealing pair when the valve plate is opened and closed. Generally, when the valve plate rotates from 0 ° to 8 ° ~ 12 °, the sealing surface of the double eccentric butterfly valve can be completely separated from the sealing surface of the valve seat, so that the sealing surface of the valve plate and the valve seat is relatively mechanical in the opening and closing process of the double eccentric butterfly valve. The extrusion angle stroke is shorter, so as to reduce mechanical wear and extrusion deformation and improve the sealing performance of the butterfly valve.

Main reasons for sealing performance failure of double eccentric butterfly valve

(Summary description)Double eccentric butterfly valve is usually called high-performance butterfly valve. It is further improved on the basis of single eccentric butterfly valve. It is a widely used butterfly valve at present. Structural features of double eccentric butterfly valve: the rotation center of the valve plate (i.e. the center of the valve shaft) forms a dimensional offset with the sealing section of the valve plate and the centerline of the valve body.

Sealing principle of double eccentric butterfly valve: Based on the single eccentric sealing butterfly valve, the rotation center of the valve plate (i.e. the center of the valve shaft) deviates from the center line of the valve body. When the double eccentric sealing butterfly valve is fully opened, the sealing surface of the valve plate will be completely separated from the sealing surface of the valve seat, forming a gap greater than the single eccentric gap between the sealing surface of the valve plate and the sealing surface of the valve seat, So as to reduce the gap between the two sealing surfaces of the double eccentric butterfly valve sealing pair when the valve plate is opened and closed.

Generally, when the valve plate rotates from 0 ° to 8 ° ~ 12 °, the sealing surface of the double eccentric butterfly valve can be completely separated from the sealing surface of the valve seat, so that the sealing surface of the valve plate and the valve seat is relatively mechanical in the opening and closing process of the double eccentric butterfly valve. The extrusion angle stroke is shorter, so as to reduce mechanical wear and extrusion deformation and improve the sealing performance of the butterfly valve.

  • Categories:News
  • Author:
  • Origin:
  • Time of issue:2021-10-09 13:48
  • Views:
Information

Double eccentric butterfly valve is usually called high-performance butterfly valve. It is further improved on the basis of single eccentric butterfly valve. It is a widely used butterfly valve at present. Structural features of double eccentric butterfly valve: the rotation center of the valve plate (i.e. the center of the valve shaft) forms a dimensional offset with the sealing section of the valve plate and the centerline of the valve body.

Sealing principle of double eccentric butterfly valve: Based on the single eccentric sealing butterfly valve, the rotation center of the valve plate (i.e. the center of the valve shaft) deviates from the center line of the valve body. When the double eccentric sealing butterfly valve is fully opened, the sealing surface of the valve plate will be completely separated from the sealing surface of the valve seat, forming a gap greater than the single eccentric gap between the sealing surface of the valve plate and the sealing surface of the valve seat, So as to reduce the gap between the two sealing surfaces of the double eccentric butterfly valve sealing pair when the valve plate is opened and closed.

Generally, when the valve plate rotates from 0 ° to 8 ° ~ 12 °, the sealing surface of the double eccentric butterfly valve can be completely separated from the sealing surface of the valve seat, so that the sealing surface of the valve plate and the valve seat is relatively mechanical in the opening and closing process of the double eccentric butterfly valve. The extrusion angle stroke is shorter, so as to reduce mechanical wear and extrusion deformation and improve the sealing performance of the butterfly valve.

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