Working principle:
When the medium flows in the specified direction,the valve disc is pushed open by the force of the medium to realize the opening;

When the medium countercurrent,due to the spring force on the back of the valve disc and the effect of the medium reverse force,the valve disc and the sealing surface of the seat are closely fitted and closed,because the sealing surface of the valve disc is sealed by   rubber,so as to achieve the purpose of noise reduction and prevent the medium countercurrent.

Technical parameters:
Nominal Model:DN50-DN600
Nominal Pressure:PN16 N25
Applicable Temperature:0℃-80℃ Applicable Medium:Water
Nominal  Pressure:1.0Mpa-2.5Mpa Design Standard:JB/T 10674-2006 Test Standard:GB/T 13927-2008