Sure Flow’s Precision Engineered Retainerless Check Valves – FE Series Explained Retainerless Check Valve Introduction Lighter and Stronger Check Valves Compact, Non-Slam, TIght Lapped Body / Disc Seal, Shock Bumpers, Seat Life Materials of Construction and Ordering Information Dimensions ASME Class 150 to 600 Wafer Style Body Dimensions ASME Class 900 to 2500 Wafer Style Body Dimensions ASME 300 Lug Style DImensions ASME Class 150 to 600 Flange Style Body Flow Rate Vs. Pressure Drop Chart Seat Options and Simple Installation Quality from Start to Finish