https://www.wvf-valve.com/check-valve/wafer-type-check-valve/double-disc-wafer-check-valve.html
A. The springs have been designed to endure stresses and also ensure operating without failure for many cycles
B. Fully Rubber Lined Valve to avoid corrosion Inside are available.
C. The two semicircle plate responsiveness of opening and closing is quick and it is strong against corrosion also has strong durability.