1. CSE pneumatic seat valves conbined a piston within a cylinder, ball housing, stem, and connected end parts and are developing to various flowing types such as F type and others like L/L, T/T, L/T, Y, T, L, T/L.... 2. Can be working automatically by air in case of the valves are equipped with CSE's control boxes. 3. A piston valve is a device used to control the motion of fluid in tube according to linear motion of a piston within a cylinder. 4. Standard available SMS, DIN, RJT, INCH standard for Welding ends; Clamp ends; Unions male/female ends... 5. Material. All products connect with fluid are made of S.S. AISI 316/316L (1.4404 /1.4401 1.4571) The other parts in AISI 304 (1.4301) The valve stem is sealed by a special EPDM/Silicone/Viton seat and according international standard for using on food or pharmaceutical