Valve material shall not be less than the pipe material

According to temperature and pressure, corrosive appropriate choice of material, safety valve burner valve material shall not be less than the pipe material. Also because it contains tar, and therefore increase the steam purge gas burner safety valve attached to prevent the tar and the bearing. Also the stem to extend (due to high temperatures, and bearing purge, dual bearing design, etc.), since the valve actuator for large diameter, high temperature, we recommend the use of hydraulic actuators, valves can be welded or flanged connections. Recommended flanged, welded mainly worried connection is possible due to the welding heat stress causes the valve lift at high temperature deformation, French door leading to leakage.