Technical specification
Structural formation  Double eccentric structure
Design reference  GB  API
Driving manner  Hand-operated,worm wheel & worm screw pneumatic operated,Electric-driving
Design standard  GB/T12238  API609 MSS.SP-68
Face to face  GB/T12221  ASMEB16.10,API609.MSS.SP-68
Flanged ends  JB/T79,JB/T82,GB/T9115  ASMEB16.5,ASMEB16.47
Test & inspection  JB/T9092  API598

Notes:The sizes of valve connecting flange and butt-welding terminas can be designed according to customer's requirement.
 
Major parts matrial form
No.  Patr name  Material  No. Patr name  Material
1  Body  WCB,CF8,CF8M,CF8C,CF3,CF3M  5  Packing Graphite
2  Stem  1Cr13,2Cr13,1Cr18Ni9Ti,0Cr18Ni12Mo2Ti 6  Stuffing cover  WCB,CF8,CF8M
3  Disc  WCB+F4,WCB+ stainless steel composite component,WCB+F6,CF8,CF8M  7  Yoke  WCB,CF8,CF8M,CF3,CF3M
4  Packing seat  2Cr13  8  Worm device  

Notes:Relevant material of america standard is not to be particularized respectively.