Stainless Steel (SS) vertical non-return valves (NRV) are one-way check valves designed for upward-flow pipelines. Standard sizes range from 1/2″ (15 mm) to 2″ (50 mm) with pressure ratings up to 16–25 bar (or 3000 PSI for high-pressure types), operating at temperatures up to 80°C–200°C. Materials & Construction • Body Material: Stainless Steel CF8 / SS 304 or CF8M / SS 316 • Spring & Disc: SS 304 / SS 316 internal spring-loaded guided disc • Sealing / O-Ring: Nitrile (NBR), PTFE, or Viton for bubble-tight sealing • End Connections: Screwed female parallel threads (BSP / NPT) as per BS 21 / IS 554 or flanged options. Operational Limits • Orientation: Strictly vertical installation with upward media flow • Working Media: Water, oil, gas, steam, and mild chemicals • Hydrostatic Test Pressure: Shell test approx. 25–425 PSI (25 kg/cm²) and Seat test approx. 16–300 PSI If you're looking to purchase or install one, please share:The exact size you need (e.g., 1/2', 1', 2')The media type (water, oil, chemical, or gas)Your required pressure rating or grade (SS 304 vs SS 316)I can help narrow down the exact specifications or source matching options for you.