... rising-stem gate valves are available in temperature classes L, P, R, S, T, and U specified in API 6A. Gate ... valves to be used in the 350°F or 650°F high temperature ... slab gate valves are available in temperature classes L, P, R, S, T, and U specified in API 6A, or ... high temperature the 350°F or 650°Fon request. Fire-proof ...