Propylene Glycol and Failing Sanitary Ball Valves
Propylene Glycol and Failing Sanitary Ball Valves
(OP)
Guys
I have a sanitary ball valve where the Teflon seats are failing. product is propylene glycol running at 250 f and 100 psi
other products run at these temps and pressure with no issues
we are new to propylene glycol, but what I can find Teflon should be fine with this chemical
are there any ideas out there....
thank you
I have a sanitary ball valve where the Teflon seats are failing. product is propylene glycol running at 250 f and 100 psi
other products run at these temps and pressure with no issues
we are new to propylene glycol, but what I can find Teflon should be fine with this chemical
are there any ideas out there....
thank you





RE: Propylene Glycol and Failing Sanitary Ball Valves
RE: Propylene Glycol and Failing Sanitary Ball Valves
RE: Propylene Glycol and Failing Sanitary Ball Valves
ok a little more details, it seems like the Teflon is deforming and cannot close
looks like it is getting forced out (think squeezing playdoh)just not that extreme
as the pressure/temperature is within spec, I am thinking a chemical reaction, I don't know what else
is being used besides the propylene glycol, but will find out
thanx again
RE: Propylene Glycol and Failing Sanitary Ball Valves
Is it possible the valve defect from the vendor?
RE: Propylene Glycol and Failing Sanitary Ball Valves
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube
RE: Propylene Glycol and Failing Sanitary Ball Valves
not a plastics expert here, not sure how the Teflon seats are constructed
but I do have new info.
the failing valves are exposed to a cycling of the temperature from 40 degrees f to 265 degrees f
in the same process line same valves with a consistent temp are not failing...
its great how you get piece meal information....looks like we found the smoking gun
RE: Propylene Glycol and Failing Sanitary Ball Valves
RE: Propylene Glycol and Failing Sanitary Ball Valves
RE: Propylene Glycol and Failing Sanitary Ball Valves
We switched to either PEEK seats or a 50% teflon 50% stainless seat.
Both last multiple years in tough services.
Regards
StoneCold