The main material of ANSI double flange butterfly valve is stainless steel and carbon steel. Triple Offset butterfly valve structure, using metal hard seal valve seat, The main operation mode is worm gear. It is a butterfly valve designed and manufactured according to the current American standard API609.
double flanged metal seated ANSI butterfly valve
The product adopts a three-dimensional eccentric oblique cone valve seat, and the butterfly plate seal adopts a new type of metal sheet inlay, which can be more consistent with the valve seat.
The butterfly plate is used to rotate and compress the seal, so the frictional resistance of the sealing surface is small. When it is closed, it becomes tighter and tighter. The offset geometry is intended to reduce rubbing during travel; it does not guarantee freedom from sealing-surface damage. Confirm material suitability, cleanliness, operating conditions and the maintenance requirements for the selected valve.
Frequently Asked Questions
Will this double-flanged valve replace my existing butterfly valve without changing the pipework?
Compare the mating flange specification, facing, drilling and face-to-face length with the selected drawing. Also check the space for the disc travel and worm-gear operation before approving a replacement.
What should I specify for the metal seat and wetted materials?
Provide the process medium, operating pressure and temperature and required shutoff duty. Request confirmation of the body, disc, seat and other wetted materials for the actual assembly rather than assuming one metal-seated configuration suits every service.
Does the API 609 reference tell me which inspection documents will be supplied?
State the design-standard edition, testing and documentation requirements in the inquiry. Ask for confirmation of the applicable requirements and supplied records for the order; the standard reference on this page is not itself an inspection certificate.