Thank you all for your well thought suggestions. I have enough new things to try to keep me busy for a long time. The Stellite suggested by lgearhart seems very promising. If anyone is curious the patent no. is 6,973,936.
Thank you TVP. We have looked into this and cannot remove all the tensile shock loading produced by the high pressure fluid. We tried saphire as well with immediate fracture results.
The gate has .094 in. bore and is partially covered by a seal ring with a land width of .110 in. and a major diameter of .42 in.
Pressure can load the seal ring to the gate at 20,000 psi contact stress while dropping 10,000 psi through an orifice created by the valve position to control...
A difficult erosion problem is handling a 10 kpsi pressure drop across very small (.005 in.) orifices created by sliding gate valve seats. Tungsten carbide is quickly eroded. The candidate material must slide at low speed as the valve opens with 20 kpsi contact stress without galling. The fluid...
Of course it is permissible. It is also permissible to machine the valve body from hot finished bar.
What is the purpose of using a forging if the advantage of grain structure control is wasted?
