Standard: GB12238

Nominal pressure: PN0.25-1.0Mpa

Nominal diameter: DN400 -3000mm

Suitable media: clean water

Patent No.: ZL95230750.2

Main feature: rubber sealing ring is hollow, water flow into or leading-out through direction changing-right valve. Under disk close condition, water filling shall strengthen sealing performance, and reduce friction when the disc rotate which make water lead out, thus improve sealing performance and service life.