Resilient Seated or Metal Seated Design Concentric or Eccentric (Single Eccentric, Double Eccetric, Tri-eccentric) Design Wafer, Lug, Butt Welded, Groorved or Flanged Ends
Three-dimensional incline taper airproof seat 900 openinger cleaning
Triple eccentric,Bereled wedgedisc small friction and torque,self-clean
Manual,electric,pneumatit and gear operation etc.