进口低阻力倒流防止器 美国RETZ瑞茨

　　品牌：RETZ瑞茨/美国，我们一直致力于流体控制领域的持续创新，始于2005……

　　性能：低阻力倒流防止器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

　　Performance: Low resistance backflowpreventers are mainly used for effective isolation between urban water supplynetworks and various user networks, or for cross connections between domesticdrinking water and heterogeneous water systems such as fire water, airconditioning water, and green water, or for the installation of negativepressure free equipment, which can strictly prevent the occurrence of backflowpollution

　　产品详情 Product details

　　低阻力倒流防止器由进口止回阀、出口止回阀、泄水阀及球阀管路等组成。管道水正常流动时，进口处的供水压力总高于出口处的压力，水直接流过倒流防止器，此时进口处压力与中腔压力形成一个压力差。此压力差驱动泄水阀处于关闭状态，泄水阀不泄水。当流量为零时，进出口止回阀均关闭，此时由于止回概弹簧的作用，进口处压力仍高于中腔压力，泄水阀依旧保持关闭状态。当由于一些原因出口压力增高或进口压力降低，当出口压力高于进口压力时，排水阀打开泄水，将中腔内的水排出，避免管路水倒流污染主管网。当主管网检修或由于一些原因停水时，进口压力下降到一极小压力时，泄水阀全开泄水，空气进入中腔，形成空气隔断。不管进口压力降到多小即使为负值，也不会产生虹吸现象污染主管网。

　　The low resistance backflow preventerconsists of an inlet check valve, an outlet check valve, a drain valve, and aball valve pipeline. When the pipeline water flows normally, the water supplypressure at the inlet is always higher than the pressure at the outlet, and thewater directly flows through the backflow preventer. At this time, the pressureat the inlet and the pressure in the middle chamber form a pressure difference.This pressure difference drives the drain valve to be closed, and the drainvalve does not release water. When the flow rate is zero, both the inlet andoutlet check valves are closed. At this time, due to the action of the checkspring, the pressure at the inlet is still higher than the pressure in themiddle chamber, and the drain valve remains closed. When the outlet pressureincreases or the inlet pressure decreases due to some reasons, and the outletpressure is higher than the inlet pressure, the drainage valve opens todischarge the water in the middle chamber, avoiding the backflow of water inthe pipeline from polluting the main pipe network. When the main network isrepaired or the water supply is shut down due to进口低阻力倒流防止器3.jpg some reasons, the inlet pressure drops to a very smallpressure, and the water release valve is fully opened to release water. Airenters the middle chamber, forming an air partition. No matter how low theinlet pressure drops, even if it is negative, there will be no siphoningphenomenon that pollutes the main network.

　　进口低阻力倒流防止器工作原理Workingprinciple

　　A、正向通水：进口压力大于出口压力时，两个止回阀瓣开启，排水器关闭。在2m/s流速时，流通水损小于0.04Mpa. forward water flow:When the inlet pressure isgreater than the outlet pressure, the two check valves are open and the drainis closed. At 2 m/s flow rate, the circulating water loss is less than 0.04Mpa.

　　B、反向关闭：进口压力小于等于出口压力时，两个止回阀瓣关闭，排水器开启。如果没有垃圾卡阻，两个止回阀瓣密封关闭，排水器出口不排水，中间腔与大气相通，中间腔压力为零。reverse closed:When the inlet pressure is less than or equal to theoutlet pressure, the two check valves close and the drain is open. If there isno garbage block, the two check valves are closed, the drain outlet does notdrain, the middle cavity is connected with the atmosphere, and the pressure ofthe middle chamber is zero.

　　C、防止回流污染：进口压力小于出口压力时，两个止回阀瓣处于关闭状态，排水器处于开启状态如果其中一个或两个止回阀瓣的阀口有垃圾卡阻，产生渗漏，所漏介质均流向中间腔，经过排水器直接排出阀外，防止对进口端的回流污染。注：P1为进口端压力，P2为中间腔压力，P3为出口压力。Prevent backflowpollution: When the inlet pressureis less than the outlet pressure, the two check valve valves are in the closedstate, and the drain device is in the open state. If one or two of the checkvalve valves have garbage blocked, causing leakage, the leakage medium flows tothe middle cavity, and the valve is directly discharged through the draindevice to prevent the backflow pollution of the inlet end. Note: P1 is theinlet pressure, P2 is the intermediate chamber pressure and P3 is the outletpressure

　　进口低阻力倒流防止器功能和特点Functionand characteristics

　　①由前后两个止回阀和中间自动排水器组成 Itconsists of front and back check valves and intermediate automatic drain.

　　②在前后止回阀产生渗漏时，能够自动排水，阻断回流，严格防止回流污染，保护上游管道内的水质When the front and rear check valves produce leakage, they canautomatically drain water, block backflow, strictly prevent backflow pollution,and protect the water quality in the upstream pipeline.

　　③chao低水损、节能显著：水头损失小于0.04Mpa。Ultra-low water loss and significant energy saving: the head loss isless than 0.04 Mpa

　　④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。Air partition, automatic drainage: when the reflux state occurs,when the main valve is closed, the drainage device automatically opens, themiddle cavity pressure relief is zero, between the upstream and downstream ofthe main valve to achieve air partition or zero pressure partition, partitionperformance is safe and reliable.

　　⑤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。Flexibleinstallation: small appearance, light weight, structure length is only 30% ofthe existing similar products; can be installed horizontally or vertically.

　　技术规范 Technicalspecifications

　　阀体：球墨铸铁、铸钢、不锈钢

　　阀瓣：不锈钢

　　阀套：不锈钢

　　排水器：不锈钢、铜合金

　　密封件：三元乙丙橡胶，硅橡胶

　　外接配件：不锈钢、铜合金

　　阀体材质:铸钢,不锈钢

　　公称压力：1.0～2.5MPa

　　公称通径：50～600mm

　　适用介质：水

　　适用温度：0～80℃