Specification
NWV DN80 Hydraulic Vertical Swing Water Check Valve
I. Product Overview
NWV DN80 hydraulic vertical check valves are constructed from WCB carbon steel, designed to GB/T 12235 and API 594 standards. The valve disc lifts along vertical guide rods to prevent backflow automatically. With a nominal diameter of DN80 (3″) and pressure classes PN16-PN40 (150LB-300LB), it operates at -10℃~80℃, specialized for water pipelines in municipal water supply, industrial circulating water, and building fire protection.
II. Core Technical Parameters
Specifications & Operating Range
Nominal Diameter: DN80 (3″), compatible with DN80 flanged connections
Pressure Class: PN16 (1.6MPa), PN25 (2.5MPa), PN40 (4.0MPa)
Temperature Range: -10℃~80℃ (standard), optional -40℃~120℃ (high-temperature seal configuration)
Media Compatibility: Clean water, sewage, circulating water (solid content ≤0.5%)
Materials & Sealing System
Body/Bonnet: WCB carbon steel (tensile strength ≥485MPa), hot-dip galvanized surface (coating thickness ≥80μm)
Disc: WCB carbon steel with NBR rubber seal, Shore hardness 70±5
Stem: 2Cr13 stainless steel (HRC28-32), chrome plating ≥20μm
Connection: Flanged (RF face, GB/T 9113-2010/ASME B16.5)
Mechanical Performance
Opening Pressure: ≤0.02MPa (forward flow resistance)
Closure Response Time: ≤0.3s (triggered by backflow)
Fatigue Life: 50,000 cycles without seal failure (GB/T 13932)
