Jose, I assume that you are referring to the disc of a gate valve, is that correct? Also, the media is water? The application is a deluge for a fire system? If the answer is yes to all three then I suggest API trim 8 which is a 13% Cr with HF stellite.
This is for valve manufacturers. They are to test before painting to assure the quality of the casting as the body will then be painted inside and out. To ensure that they do not cover up the interior seal of the body with epoxies so that if there are imperfections in the casting they can find...
Western manufacturer not recommended. In England Shipham Valves manufacture butterfly valves in exotic materials, however, delivery is very long and the prices are astronomical. I have used a Korean manufacturer with excellent results and pricing for projects in Mexico. They have manufactured...