Soft seat in butterfly valves with BWE

[spjfive]

Is there any option to give soft seat in Butterfly valves with Buttweld Ends?

 

[bcd]

Yes. Such valves do exist. Product is regularly used in sanitary market. Also common for cryogenic applications.

 

[spjfive]

Okay, but does it conform to any face to face standard, because in API 609, they haven't mentioned any buttweld end dimensions. So it is manufacturer's standard?

 

[mk3223]

I believe it's the critical to verify with Vendor and confirm the face-to-face dimension of the butterfly valve manufacturer to ensure the proper piping design and installation.

 

[spjfive]

Okay. Thank you for the replies bcd and mk3223

 

[Nick_Gray_88]

I have a recollection that the responsibility for the PTFE seats not to melt when the valve is welded into the line lies with the manufacturer.

From memory Velan manufacture this valve with a cryogenic stem extension and access hatch, might be worth a look?