Description :

CHECK VALVE

Check valve or Non Return Valve allow fluid to flow in one direction only. Large fire protection systems sometimes experience severe water hammer caused by backflow when the automatic control shuts down the fire pump. Where conditions can be expected to cause objectionable water hammer, a listed anti water-hammer check valve should be installed in the discharge line of the fire pump. According to NFPA20, 4.15.6* – A listed check valve or backflow preventer shall be installed in the pump discharge assembly.

FEATURES

MODEL: SD-NRV200FF-D / SD-NRV300FF-D

• Working pressure: 200 & 300 psi
• Connection ends: Flange to ASME B16.1 Class 125
• Temperature range: 0ºC to 80ºC
• Coating: Fusion bonded epoxy coating internally and externally in accordance with ANSI/AWWA C550

MODEL: SD-NRV200CV

• Working pressure: 200 psi
• Connection ends: Flange to ASME B16.1 Class 125
• Bolted bonnet. Horizontal swing. Renewable seat and disc.
• Temperature range: -29ºC to 66ºC
• Bronze trimed disc, 125 psi steam @232° C,. Non-shock cold water oil or gas.
• Conform to MSS SP-71.

MODEL: SD-NRV250CV

• Working Pressure 250 psi. Cold water pressure (Max. temp. 63ºC)
• Flanged Ends to ANSI B16.1 Class 125
• Ductile Iron Body with EPDM
• Epoxy coated interior / exterior to AWWA C550
• Dual Plate Construction

MODEL: SD-NRV200GG-D / SD-NRV250GG-D / SD-NRV300GG-D

• Working pressure: 200, 250 & 300 psi
• Connection ends: Groove to AWWA C606
• Temperature range: 0ºC to 80ºC
• Coating: Fusion Bonded Epoxy Coating in accordance with ANSI/AWWA C550 or painting upon request