— Non-return valves manufactured and tested acc. to EN 1074-3 (water supply valves)
— Resilient seated acc. to EN 16767
— Flanges acc. to EN 1092-2 PN 10/16
— Installation length acc. to EN 558-1, series 48
— Final strength and tightness test acc. to EN 12266-1
— Fullbore type acc. to EN 736-3:2008; 3.3.1.
— Corrosion protection acc. to DIN 30677-2 and EN 14901
— Sealing elements for drinking water acc. to EN 681
— Microbiological suitability acc. to EN 16421 (W270
Art. 437 NORVA LW
DN 40-500
- Complete closing even at small pressure difference < 0,5 bar
- Small pressure losses
- An additional built-in shaft allows the fitting of a lever and weight to close the return flow more quickly
- DN 350-500 with relief valve (bypass)
- Horizontal and vertical installation possible
- Easy maintenance – no removal from the pipeline and easy disassembly of cover and disc
— UBA, W270, ACS WRAS, Belgaqua for EPDM sealing elements and Epoxy coating
— GSK – RAL GZ-662/2 for corrosion protection
— EAC for the Russian market
— EMI for the Hungarian market
— VIK for the Croatian market
— Conformity for potable water acc. to DM 174 for the Italian market
POSSIBLE ADDITIONS
— Manometer connections
— Lever & weight, guard
— Lifting device
— PN 6 flanges
SPARE PARTS
— Set 1: EPDM/NBR rubberized disk, O-ring for bonnet, bearings
— Set 2: EPDM/NBR O-ring for bonnet, gasket for plug screw