API Lug Butterfly Valve

American Standard Butterfly Valve Geometric Graph

Firstly: The eccentric shaft deflected from the center line of sealing surface. Secondly: The eccentric shaft deflected from pipe and center line of valve. Thirdly: The unique design of eccentric seat oblique cone and the angle of centerline, makes the seat and sealing ring completely out from the door during the open and close.This structure adopted the cam effect, completely eliminating the friction, avoiding the possibility of wear and leakage.

Our triple eccentric butterfly valve realizes zero leakage relying on the composite stainless steel sealing ring installed in the disc.

Zero leakage is implemented by the elastic sealing ring mounted on the disc. The elasticity of sealing ring is produced by its radial compression and flexibility. The contact surface between the sealing ring and seat is an oblique cone. The contact angle between them gives slight "wedge effect", making the sealing ring producing flexibility and radial compression. The even contact between the seat and sealing ring, and the elasticity of sealing makes the load on the seat even, thus to perform closest cut off by the lowest torque. The elasticity produced by the torque makes the valve closely cut off,regardless of the flow direction or pressure of medium

Purpose and Characteristic

Elastic property of composite metal sealing ring performs zero leakage. The torque seal ensures constant zero leakage characteristics of the valve The design of right- angled rotation with zero friction is implemented by the distinctive triple eccentric principle; it eliminates the friction between the seat and sealing ring in 90° rotation STLone-piece hard-surface seat may adapt to many working conditions, which is featured with long service life and easy maintenance. One-piece cast(sheet welded) body, face to face dimensions conforming to ISO05752,ASME16.10 and APl609, replacement of high performance butterfly valves and other types of valves, easy and flexible installation, intrinsical fireproof property thanks to all metal structure and leak tight performance. Anti-blowout stem designs for high dependability,completely conforming to APl6109 The valve position indicator on the stem and the flange mounted at the top of are in the favor of the indication of disc position. The stem of American standard triple eccentric butterfly valve, is a shaft structure, stem and disc are connected by key or pin-key combination.

Adoption Standard

Main Technology Parameter

Material for Main Parts

Main Connection Dimensions                       ASME 16.5-2013单位:Unit:mm

Main Connection Dimensions           A系列 ASMEB 16.47-2011 单位:Unit:mm

Main Connection Dimensions           B系列 ASMEB 16.47-2011单位:Unit:mm