UNE-EN 1680:1997 PLASTICS PIPING SYSTEMS. VALVES FOR POLYETHYLENE (PE) PIPING SYSTEMS. TEST METHOD FOR LEAKTIGHTNESS UNDER AND AFTER BENDING APPLIED TO THE OPERATING MECHANISM.
1997UNE-EN 1680:1997 PLASTICS PIPING SYSTEMS. VALVES FOR POLYETHYLENE (PE) PIPING SYSTEMS. TEST METHOD FOR LEAKTIGHTNESS UNDER AND AFTER BENDING APPLIED TO THE OPERATING MECHANISM.