GB/T3037-74 Marine double-eccentric Butterfly Valve

Model: GB/T3037-74; Valve body material: cast iron, ductile iron, cast steel, stainless steel, bronze; Nominal diameter: DN100-DN800; Applicable media: seawater, fresh water, air and crude oil not higher than 70°

Overview

Feature:

Normally Butterfly Valve is single eccentric or double eccentric structure, the purpose of eccentricity is: to make the butterfly plate open to about 20 ° after the valve seat and the sealing surface to disengage from each other, so as to reduce friction.

Double eccentric structure is designed to deviate the sealing surface from the centerline of the sealing surface to form the first eccentricity; the shaft is slightly deviated from the centerline of the pipeline to form the second eccentricity. The purpose of these two eccentrics is to reduce the friction between the seat and the seal during the valve switching stroke.

Drawing: