The King Lai sanitary check valve is designed for use in the pipeline to prevent reverse flow. Self-operated check valves CK3 must be installed on a vertical pipe,allowing fluid to flow from bottom to top only.The valve body is sealed by gravity without spring support. It can be applied to clean fluid or gas,with simple structure and easy maintain. Spring-type check valves CK1 or CK 2 is manufactured with full forging process.The valve body is connected with clamp rings so as to disassemble easier. All these check valves are sanitary,prevent from bacterial and without any dead-end.