These valves are manufactured for the need of regulating the flow rate of fluid or liquid through a cylindrical tube. These valves are mostly used in the industry to great extent especially in automation units of the industry. For example piston valves with testing standard API 598/ 602 are available for the customers from mentioned platform from size 15 mm to 50 mm easily. Materials A105, F304, F316 are used for the manufacturing of these valves easily.