Specification
NWV ANSI DN150 PN16 Diaphragm Cast Iron Non-return Spring Dual Plate Wafer Check Valve
I. Product Overview
NWV diaphragm-type ductile iron spring double-disc wafer check valves are designed to API 594 and DIN EN 1092 standards, constructed from QT450-10 ductile iron. The dual-disc linkage with spring-loading ensures automatic backflow prevention, covering DN40-DN800 (1.5″-32″) with PN10-PN16 (1.0-1.6MPa) pressure ratings and -10℃~120℃ operating temperatures. Suitable for water, sewage, steam, and oil, they excel in municipal water supply, building networks, and industrial circulating water systems.
II. Core Technical Parameters
Specifications & Operating Range
Nominal Diameter: DN40/50/80/100/150/200/250/300/400/500/600/800 (1.5″-32″)
Pressure Class: PN10 (1.0MPa), PN16 (1.6MPa)
Temperature Range: -10℃~120℃ (standard), -40℃~150℃ (special seal option)
Media Compatibility: Water, sewage, seawater, steam, non-corrosive oils
Materials & Sealing System
Body/Disc: QT450-10 ductile iron (tensile strength ≥450MPa, elongation ≥10%)
Sealing Pair: NBR rubber diaphragm (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, ANSI 150# flanges)
Mechanical Performance
Opening Pressure: ≤0.02MPa (forward flow resistance)
Closure Response Time: ≤0.3s (triggered by backflow)
Water Hammer Protection: Withstands 1000 impact tests without damage (ISO 16780)
