Stellite seats for steam relief valve
Stellite seats for steam relief valve
(OP)
I am having trouble with erosion damage to a relief valve pilot seat from wire drawing in a steam application. The Stellite 6 seat is tapered and gives contact at the top edge. The poppet is of Stellite 12 at slightly shallower angle, about 60 degrees inclusive.
I have been advised that Stellite, although very hard wearing in most valve applications, has a susceptibility to erosion by high velocity steam.
Can anyone confirm this for me. In addition could anyone point me to any authoritative references on this subject/problem.
I have been advised that Stellite, although very hard wearing in most valve applications, has a susceptibility to erosion by high velocity steam.
Can anyone confirm this for me. In addition could anyone point me to any authoritative references on this subject/problem.





RE: Stellite seats for steam relief valve
J. Alton Cox
www.delucatest.com
RE: Stellite seats for steam relief valve
- Thread725-23517 for general information;
- Thread330-91894 and Thread408-91895 for galling of (self-mated) Stellite 6;
- Thread924-99307 for machining and tools.
My question: what about Stellite 21?
Bye to all, 'NGL
RE: Stellite seats for steam relief valve
John
RE: Stellite seats for steam relief valve
RE: Stellite seats for steam relief valve
RE: Stellite seats for steam relief valve
RE: Stellite seats for steam relief valve
RE: Stellite seats for steam relief valve
RE: Stellite seats for steam relief valve
J. Alton Cox
www.delucatest.com
RE: Stellite seats for steam relief valve
Now to eliminate this problem you need to look at Multistage technology where the pressure is taken in a number of right angle 90 dergee turns. this will keep you below the threshold of 0.3mach or 480kpa velocityhead.But now with that said there is no multistage PRVs on the market.But what you can do is add a vent valve that is connected to your DCS upstream to the PRV valve at a setpiont just below your PRV setpiont.