Specification
DN150 PN16 DIN Double Disc Wafer Spring Check Valve
I. Product Overview
NWV wafer-type double-disc stainless steel spring check valves are designed to API 594 and DIN PN16 standards, constructed from 304/316 stainless steel. Featuring dual-disc linkage and spring-loading mechanisms, they automatically prevent backflow in pipelines. Covering DN50-DN1000 (2″-40″) with PN10-PN16 (1.0-1.6MPa) pressure ratings and -10℃~150℃ operating temperatures, these valves are suitable for water, steam, oil, and corrosive media in municipal water supply, petrochemical, and food processing applications.
II. Core Technical Parameters
Specifications & Operating Range
Nominal Diameter: DN50/80/100/150/200/250/300/400/500/600/800/1000 (2″-40″)
Pressure Class: PN10 (1.0MPa), PN16 (1.6MPa)
Temperature Range: -10℃~150℃ (standard), -40℃~200℃ (high-temperature option)
Media Compatibility: Water, sewage, seawater, steam, oil, acids/bases (pH 4-10)
Materials & Sealing System
Body/Disc: 304 stainless steel (ASTM A351 CF8), 316 stainless steel (ASTM A351 CF8M)
Sealing Pair: NBR rubber (standard), EPDM (temperature-resistant), Viton (oil-resistant), leakage rate ≤0.1% (API 598)
Spring/Pin: 304 stainless steel (HRC28-32), corrosion-fatigue resistant
Connection: Wafer Type (fits DIN PN10/16 flanges)
Mechanical Performance
Opening Pressure: ≤0.03MPa (forward flow resistance)
Closure Response Time: ≤0.2s (triggered by backflow)
Water Hammer Protection: Withstands 1000 Impact tests without damage (ISO 16780)
