ceramic ball vavle thermal shock issue
ceramic ball vavle thermal shock issue
(OP)
is there anybody has done some thermal shock experiment about the ceramic lined valve, especially ceramic ball valve?? The customer is very concerned about thermal shock to go from 30F to 300F immediately. can the ceramic material lined in the valve outlive in this dramatically changed environment without breaking. I afraid that the valve is going to break in service. looking forward to your comments.
(ps. the ceramic material mainly comes from alumina+zirconia)
(ps. the ceramic material mainly comes from alumina+zirconia)





RE: ceramic ball vavle thermal shock issue
You didn't specify the type of valve, I hope this help. I have know experience about the thermal shock but even if the environment is instantly changed the change inside the valve will not be instant it will take time due to the valve heat capacity and heat transfer.
RE: ceramic ball vavle thermal shock issue
300F
350 GPM
50PSI
28% Aluminum Chloride
1% free acid 1% undissolved solids
Makes Alumina TriHydrate with the balance being water.
In reference to your explanation above, the quick changed temperature from 30F to 300F will not change the inside of ceramic valve too quick, is this ture? I know that ceramic is fragile in the condition of impacting, but i have no idea about the thermal shock ability in the promptly temp. changed envionment. Anyway, appreciate your comments.
RE: ceramic ball vavle thermal shock issue
We have small valves with ZrO seats in service that are doing excellent and have been for a number of years. We have several sliding gate valves that are in a very rough service that are lasting about 20 times the life of metal gate.
An interesting point with ZrO 4" balls when the valves are disassemble in the valve shop the valves were still operating smoothly while the cracked ball and seats look like road maps. We have counted over a hundred cracks in a ball and the ball was still holding together.
RE: ceramic ball vavle thermal shock issue
RE: ceramic ball vavle thermal shock issue
ceramic ball with Temp.15 C, put it into a furnace with Temp. 200C, then increase the temp. to 250C with 25 minutes, open and pick out the ceramic ball after keeping temp. 250C about 10 minutes. Throw the ceramic ball into 20 C water, 2 minutes later check the ceramic ball and found there are several clear crack.
I suppose that the the ceramic ball has bad performance in the temperature dramatic change condition. the short time thermal shock resistance is bad.
Any comments about our experiment are appreciated!