NWV flanged cast steel swing check valves comply with ANSI B16.1 and GB/T 13932 standards, constructed from WCB cast steel and 304 stainless steel.
Size Range:: DN50 ~ DN600
Pressure Rating:: Class 150 ~ 900
Design Standard:: API 594, ASME B16.34
Body Material:: Cast ASTM A216 WCB
Disc Material:: 13% Cr Stainless Steel
End Connections:: RF Flange (ASME B16.5)
Temperature Range:: -29℃ ~ 425℃
Seat Leakage:: API 598 (Bubble Tight)
Specification
NWV Ansi 6 Inch PN16 Cast Steel Swing Check Valve
I. Product Overview
NWV flanged cast steel swing check valves comply with ANSI B16.1 and GB/T 13932 standards, constructed from WCB cast steel and 304 stainless steel. The valve ensures unidirectional flow through a disc rotating around a horizontal pin, covering DN50-DN600 (2″-24″) with PN16 (1.6MPa) pressure rating and ≤150℃ temperature range. Suitable for water, steam, oil, and acid-base solutions, it prevents equipment damage and system failures from backflow in water supply, chemical, and thermal pipeline applications.
II. Core Technical Parameters
Specifications & Pressure-Temperature Range
Nominal Diameter: DN50/80/100/150/200/250/300/400/500/600 (2″-24″)
Pressure Rating: PN16 (1.6MPa), shell test pressure 2.4MPa, sealing test pressure 1.76MPa
Temperature Range: -20℃~150℃ (standard), -40℃~200℃ (high-temperature type)
Materials & Sealing System
Body/Bonnet: WCB cast steel (ASTM A216), 304 stainless steel (ASTM A351 CF8)
Disc/Seat: Cast steel with bronze overlay (hardness ≥HB200), sealing surface roughness Ra≤1.6μm
Gasket: EPDM (standard), graphite (high-temperature), leakage rate ≤0.1% (API 598)
Connection: Flanged (RF face, ANSI B16.5/GB/T 9113)
Mechanical Performance
Opening Pressure: ≤0.03MPa (forward flow resistance)
Closure Response Time: ≤0.5s (triggered by backflow)
Water Hammer Resistance: Withstands 1000 cycles without damage (ISO 16780)
