-Top mounted eccentric hemispherical valve
-Forged steel floating ball valve
-Forged steel floating ball valve
-Forged steel fixed ball valve
-Side mounted eccentric hemispherical valve
-Side mounted eccentric hemispherical valve
-High performance all welded pipeline ball valve
-American Standard floating ball valve
-American standard fixed ball valve
-American Standard forged steel floating ball valve
-American Standard forged steel floating ball valve
-Wafer type hard seal butterfly valve
-Automatic regulating butterfly valve
-Heavy hammer hydraulic control slow closing check butterfly valve
-Energy storage hydraulic control slow closing check butterfly valve
-Three eccentric flange hard seal butterfly valve
-Stainless steel quick installation butterfly valve
-Stainless steel threaded butterfly valve
-Stainless steel threaded butterfly valve
-ZZVP Self operated micro pressure regulating valve
-ZZWP Self operated temperature regulating valve
-ZZWPE Self operated electronic temperature control valve
-HTS Pneumatic diaphragm regulating valve
-ZMAX Pneumatic diaphragm high pressure angle regulating valve
-ZJHM Pneumatic sleeve regulating valve
-ZMAX Pneumatic diaphragm three-way regulating valve
-ZSHV Pneumatic V-shaped regulating ball valve
-ZJHP Pneumatic diaphragm regulating valve
-CV3000 Pneumatic diaphragm regulating valve
-T661Y Pneumatic feed water regulating valve
-ZDSJ Electric high pressure angle regulating valve
-ZDLQ、X Electronic electric three-way regulating valve
-ZAZP Electric single seat regulating valve
-ZDLM Electronic electric sleeve regulating valve
-ZDLM Electronic electric sleeve regulating valve
-ZDLN Electric two seat regulating valve
-T961Y Electric multi-stage regulating valve
-ZDLPF46 Electric fluorine plastic lined single seat regulating valve
-ZJHPF46 Pneumatic film lined fluorine single seat regulating valve
-ZSHO Start shut-off ball valve
-ZSHW Pneumatic regulating butterfly valve
Your location：Home - Product - Hydraulic valves
Nominal diameterDN50-DN200
Test shell strength2.4MPa~3.75MPa
Liquid high pressure seal1.76MPa~2.75MPa
Gas low pressure seal0.6MPa~0.6MPa
Temperature-29~260℃
MediumWater, steam, oil, etc
Product overview
Double check backflow preventer is a hydraulic control combination device developed by our company, which is used for urban water supply units and general pollution units to strictly limit that the pressure water in the pipeline can only flow in one direction. Its function is to prevent the backflow or backflow of medium in the pipeline under any working condition, so as to avoid backflow pollution. It is suitable for places without drainage conditions.
Product features
1.The structure is more compact, the size is short, the volume is small, the backflow is low, and the noise is low. Under the economic flow rate, the normal working water loss is 1.3-2.5m.
2.The unique flow channel design of the two-stage check valve has small flow resistance and fast opening and closing speed, which can effectively prevent the damage of the valve and pipeline caused by the sudden rise of back pressure, limit the backflow of pressure water or siphon, and has the function of mute, effectively prolonging the service life of the valve.
3.Humanized design, the product can be installed horizontally or vertically, online testing and online maintenance.
PDF Download