china factory main product DN100-DN4000 API cast iron flange double offset butterfly valve 

Double eccentric butterfly valve is unique structural design

Design of eccentric structure, the butterfly valve seat and the valve plate outer contour unique, effectively reduce operating torque, while reducing and the valve seat contact, improve sealing reliability. No mechanical internal DB type butterfly valve (fasteners) connection, no mechanical connection failure may, high reliability, the eccentric butterfly valve can adapt to the harsh working conditions. Filling epoxy resin process makes the valve plate and valve seat the contact surface with the same amount of interference, the elimination of machining and assembly errors, compared to the pressure evenly, reduce operating torque, reduce the abrasion of the sealing surface. DC type butterfly valve type N stainless steel ring is inlaid on the valve body, long can prevent corrosion, and can prevent the velocity of flow instability caused by the vibration and fastening the resulting parts loosening and shedding caused by the valve failure.     

Sealing design

the eccentric butterfly valve use of high-quality stainless steel stem, is completely covered by the O ring and the bearing, corrosion resistance. Self lubricating bearings, sleeve type shaft seat valve used on the valve stem to stem bearing support, from the rotary friction minimum.

  TWT valve company is the birthplace of china's first butterfly valve 

 

Nominal Diameter: DN100-DN4000

Nominal Pressure: 10Bar,16Bar,25Bar,Class 125,Class 150

Design Standard:  API609,AWWA C504,DIN3354,BS5155,EN593

Face To Face:  API609,ASME B16.10,DIN3202,EN558-1,ISO5752

Flange Connection: ASME B16.1 Class125/ASME B16.5 CL150/ASME B16.47 CL150/AWWA C207/

                             DIN 2501 PN10-16-25/EN1092 PN10-16-25

Inspection and Test:    EN12266-1/API 598/ISO5208

Top flange: ISO5211

Material list:

1. Body: Ductile Iron:   ASTM A536 60-40-18/ DIN1693 GGG40,GGG550
2. Disc:   Ductile Iron:    ASTM A536 60-40-18/ DIN1693 GGG40,GGG50
3. Shaft: Stainless Steel:    ASTM A182 304/316/420/ Duplex Steel

• Installation  without restriction in direction of flow.
  Reduced  weight and overall dimensions.
  Low pressure loss and reduced energy costs.
  High Kv / Cv values.
  Easy to clean and disinfect for potable water systems etc.
  Self cleaning ( no residue will be trapped ).
  Good resistance to corrosion.
  Manul , electric actuator , pneumatic actuator , hydraulic actuator , bare shaft is optional
  Wate , drinking water , portable water , Oil , sea water , gas are all available working service.
   

The double eccentric butterfly valve On-site installation and use

From 1985 the largest DN2000 flanged butterfly valve butterfly valve flange to DN2600 1996 Shenzhen Dongshen water supply, to the 2008 Shanghai Qingcaosha DN3600 two-way sealing butterfly valve flange is put into use, our factory always is a large project of large equipment manufacturing and production base.

More than 60 years of valve production experience
with advanced processing equipment
large testing laboratories
and sufficient raw material reserves