|product detailed information:|
Low resistance backflow preventer LHs743X
主要用于城镇供水管网与各类用户管网之间，或者生活饮用水与消防水、空调水、绿化水等异质水系统之间交叉连接时的有效隔断，或者无负压设备的配套安装，能够严格防止倒流污染的发生。 1. Applicable occasions: It is mainly used as an effective barrier when the cross-connection between drinking water and fire water, air conditioning water, green water and other heterogeneous water systems between urban water supply networks and various types of user networks, or The supporting installation of negative pressure equipment can strictly prevent the occurrence of backflow pollution.
Functions and features:
① It consists of two check valves in the front and back and an automatic drain in the middle.
② When leakage occurs in the front and rear check valves, it can automatically drain water, block backflow, strictly prevent backflow pollution, and protect the water quality in the upstream pipeline.
超低水损、节能显著：水头损失小于 0.04Mpa; ③ Ultra-low water loss and significant energy saving: head loss is less than 0.04Mpa;
空气隔断、自动排水：在回流状态发生时，主阀关闭时，排水器自动开启、中间腔泄压为零，主阀的上下游之间实现空气隔断或零压隔断，隔断性能安全可靠。 ④Air isolation and automatic drainage: When the main valve is closed when the backflow occurs, the drain will automatically open and the pressure in the middle cavity will be zero. Air isolation or zero-pressure isolation will be achieved between the upstream and downstream of the main valve. The isolation performance is safe and reliable.
节地节材、安装灵活 : 外形小、自重轻，结构长度仅为现有同类产品的 30％；可以水平或垂直安装. ⑤ Land and material saving, flexible installation : small size, light weight, structural length is only 30% of existing similar products ; can be installed horizontally or vertically.
: 3.Main technical parameters :
DN50—DN400; Nominal diameter: DN50—DN400;
1.0Mpa; 1.6Mpa; Nominal pressure: 1.0Mpa; 1.6Mpa;
≤0.04Mpa; Opening pressure: ≤0.04Mpa;
≤0.04 Mpa; Local head loss: ≤0.04 Mpa;
; Partition form: air partition or zero pressure partition ;
; Body material: ductile iron ;
304 不锈钢 ; Trim material: 304 stainless steel ;
≤65℃。 Applicable temperature: ≤65 ℃.
A. Forward water flow:
When the inlet pressure is greater than the outlet pressure, the two check flaps open and the drain closes. At a flow velocity of 2m / s, the water loss in circulation is less than 0.04Mpa.
B. Reverse shutdown:
When the inlet pressure is less than or equal to the outlet pressure, the two check valves are closed and the drain is opened.
If there is no garbage jam, the two check valve flaps are sealed closed, the drain outlet is not drained, the middle cavity is in communication with the atmosphere, and the pressure in the middle cavity is zero.
C. Prevent backflow pollution:
When the inlet pressure is less than the outlet pressure, the two check flaps are closed and the drain is open. If one or two check flaps are blocked by garbage, leakage occurs, and the leaked medium flows to the middle. The cavity is directly discharged out of the valve through the drain to prevent backflow pollution on the inlet side.
：P1为进口端压力，P2为中间腔压力，P3为出口压力。 Note : P1 is the inlet pressure, P2 is the intermediate cavity pressure, and P3 is the outlet pressure.
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