WC9 high temperature valves are exported to Singapore for refining project. There are 20" diameter and design pressure class 600#, it is for high temperature service application. They are wedge gate valve and swing check valve. The materials are as per ASTM A217 specification and treatment. All materials and trim are machined carefully in each procedure for our quality control. WC9 material can be up to 593 C degree service. And we ever made C12A material for another customer. C12A material will be better than WC9 in high temperature medium. For other material situation, you can visit our website www.welcovalve.com to learn more. We will be glad to select the relative reasonable material for your engineering project.