Relief Valve,Series Hydraulic Valve,Check Valve Solenoid Valve Solenoid,Relief Pressure Valve Huaian Haotian Hydraulic Co.,Ltd , https://www.haotianhydraulic.comThe rough machining commonly used castings, forgings, profiles and welding parts. Different types of rough and rough precision, roughness and hardness on the machining process has a direct impact. When choosing the valve blank should consider some of the following factors: