Valve Type SS NRV [CHECK VALVE] - SE - Universal Mounting CS / SS NRV [CHECK VALVE] - FL - Vertical Mounting Design Std ASME B 16.34 Size Range Screwed 15 DN to 50 DN [ 1/2â?? to 2â??] Flanged 15 DN to 100 DN [ 1/2 to 4] Body AISI 304 /316 / SS - ASTM A 351 Gr.CF8 / CF8M Trim AISI 304 / 316 Seat / Disc AISI 410 / 304 / 316 Design Features Screwed Spring Loaded, Guided Disc, SP / 3PDesign - Universal Mounting Flanged Spring Loaded, Guided Disc, 2P / 3P Bolted Design - Vertical / Horizontal Mounting Pr.Rating ASME Class 150 / 300 End Connection Screwed BSP / BSPT NPT - ANSI B1.20.1 Flanged ASME B16.5, RF - CLASS 150 / 300 Testing Std. BS EN 12266 -1 [BS 6755-1] / API 598 Optional Soft seat, High Pressure media