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Check Valve
Face-to-face: EN 558-1, ISO 5752.
Flange Surface Design: EN 1092 Form A/B, ASME RF, FF.
Flange accommodation: EN 485 PN 10/16, ASME Class 150.
Marking: EN 19.
Tightness check: EN 12266 (Leakage Rate A), ISO 5208:2015, category AA.
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