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The Flomore ductile & steel threaded end swing
check valves meet MR-01-77 NACE standards.
The standard seal material is Buna-N (180
degrees Fahrenheit). It can also be trimmed
with Flomore's "Coldseal" to -50 degrees
Fahrenheit & to 400 degrees Fahrenheit with
Viton. Standard clapper material is Carbon Steel
or 17-4 Stainless Steel. Pressure range is from
300-5,000 psi WOG.