Paten No.: ZL92210902.8

Standard: Q/TF-B27H.01

Nominal pressure: PN0.25-1.0Mpa

Nominal diameter: DN1000 -2000mm

Two types: rubber sealed and metal sealed. Equipped with a big and a small disks, small disk in center of the big one, big disk quickly drop when close and damp upon approaching close position, controlled by other cylinder, the small disk quick close and then slow close, speed slower than that of the big one. Efficiently prevent water hammer and reverse flow.