China Center Line Folder Soft Seal Butterfly Valve

Centerline Seal Butterfly Valve
With the disc seal center of butterfly valve and rotation center of stem overlapped,sealing load Will be produced between the sealing faces of seat and disc under certainmagnitude of interference. Thus to ensure effective seal of valve. Lined with rubber on body.This structure is applicable for me-dium and small-bore butterfly valves. Due to thedeformation under extrusion.during the process of opening and closing, disc is alwaysunder extrusion.So. the upper and lower valve shafts are seriously extruded, whichcan be bad to the service life of valve. And. the open-close moment of valve is rela-tively high. The defect is that disc and seat are always under extrusion, scra- tch, highresistance andserious adrasion. To overcome extrusion and scratch and to ensuregood seal, seat basically uses rubber or PTFE,or other elastic materials. However,temperature can be a problem. This is why butterfly valves are ,conventionally, notresistant to high temperature.

Design StandardGB/T12238API609,MSS SP-67Pressure-Temperature RatingGB/T12224API609Face-FaceGB/T12221API609Flange EndsGB/T9113,JB/T79ASME B16.1B16.5B16.47BS4504Inspection&TestJB/T9092,GB/T13927API598Norminal Pressure(MPa)1.01.62.0CLASS125CLASS150CLASS250(MPa)
Test PressureShell Test1.52.43.01.552.943.11High Pressure Seal Test1.11.762.21.132.162.28Low Pressure Seal Test0.60.60.60.60.60.6Applicable Temperature-10ºC~90ºC()
Different raw material for different work temperatureApplicable MediumWater,oil,gas and other non-causticity medium(Different raw material for different medium)

NoPart NameMaterialsOpptional Materials1BodyCast IronDuctile Iron/Carbon steel2SeatNBR or EPDMNeoprene,Viton,PTFE3DiscDuctile Cast IronAluminum Bronze,SS,Mnel4BushingPTFELuberized Bronze5Pin316Mnel6Stem2Cr13SS,Mnel

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