We are looking for a supplier for dual plate wafer type check valves in various materials, such as GGG40, 1.4408, Alu-bronze and other special metals. Face to face design: API594 and EN558-1 row16; flanged ends accoring to ANSI and/or DIN. The supplier must be ISO certified; we will require 3.1 certificates; AD2000 certification an advantage.