BUENO PFA lined spring type check valve is mainly used for high corrosive chemical agent.

A check valve, clack valve, non-return valve, reflux valve, retention valve or one-way valve is a valve that normally allows fluid to flow through it in only one direction. Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave.
BUENO has its own and well developed PFA Lined Check Valve up to state for best protection against corossive media in chemical and other related application.