德国莱克lik减压阀是采用控制阀体内的启闭件的开度来调节介质的流量，将介质的压力降低，同时借助阀后压力的作用调节启闭件的开度，使阀后压力保持在一定范围内，并在阀体内或阀后喷入冷却水，将介质的温度降低，这种阀门称为减压减温阀。该阀的特点，是在进口压力不断变化的情况下，保持出口听压力和温度值在一定的范围内。
德国莱克lik减压阀广泛用于高层建筑、城市给水管网水压过高的区域、矿井及其他场合，以保证给水系统中各用水点获得适当的服务水压和流量。鉴于水的漏失率和浪费程度几乎同给水系统的水压大小成正比，因此减压阀具有改善系统运行工况和潜在节水作用，据统计其节水效果约为30%。
德国莱克lik减压阀的构造类型很多，以往常见的有薄膜式、内弹簧活塞式等。减压阀的基本作用原理是靠阀内流道对水流的局部阻力降低水压，水压降的范围由连接阀瓣的薄膜或活塞两侧的进出口水压差自动调节。近年来又出现一些新型减压阀，如定比式减压阀。定比减压原理是利用阀体中浮动活塞的水压比控制，进出口端减压比与进出口侧活塞面积比成反比。这种减压阀工作平稳无振动；阀体内无弹簧，故无弹簧锈蚀、金属疲劳失效之虑；密封性能良好不渗漏，因而既减动压（水流动时）又减静压（流量为0时）；特别是在减压的同时不影响水流量。
减压阀通常有DN50～DN100等多种规格，阀前、后的工作压力分别为＜1MPa和0．1～0．5MPa，调压范围误差为±5%～10%。
德国莱克lik减压阀的选型
减压阀进口压力的波动应控制在进口压力给定值的80％～105％，如超过该范围，减压阀的性能会受影响。
1. 通常减压阀的阀后压力P2应小于阀前压力的0.5倍，即P2<0.5P1。
2. 减压阀的每一档弹簧只在一定的出口压力范围内适用，超出范围应更换弹簧。
3. 在介质工作温度比较高的场合，一般选用先导式活塞式减压阀或先导式波纹管减压阀。
4. 介质为空气或水（液体）的场合，一般宜选用直接作用薄膜式减压阀或先导式薄膜式减压阀。
5. 介质为蒸汽的场合，宜选用先导活塞式减压阀或先导波纹管式减压阀。
6. 为了操作、调整和维修的方便，减压阀一般应安装在水平管道上。
根据使用要求选定减压阀的类型和调压精度，再根据所需zui大输出流量选择其通径。决定阀的气源压力时，应使其大于zui高输出压力0．1MPa。减压阀一般安装在分水滤气器之后，油雾器或定值器之前，并注意不要将其进、出口接反；阀不用时应把旋钮放松，以免膜片经常受压变形而影响其性能。
Germany valve is used shrek lik open or close the valve body pieces of the opening to adjust medium flow, will media pressure reducing valve, and the effects of stress by after the opening to adjust on-off thing, after the valve pressure retaining within a certain range, and in the body or valve into the gush after the temperature of cooling water, will reduce, the medium pressure reducing valve called temperature valves. This valve characteristic, is in the inlet pressure changing circumstances, preserve export listen to pressure and temperature in a certain range.
Germany lik fleetwood valve widely used in high-rise buildings, urban water distribution network of excess water pressure regional, mines and other occasions, to ensure that the water supply system in each water point to acquire adequate water pressure and flow of service. In view of the water LouShiLv and wasteful of water supply system with almost water pressure reducing valve is proportional to size, so has the potential to improve system running condition and water-saving effect, according to statistics, its about 30% water-saving effect.
The German lake lik pressure reducing valve, past many structure types of common have film type, spring in the piston, etc. The basic mechanism of the pressure reducing valve in the valve is to rely on local resistance to water flow of the reduced pressure, hydraulic pressure drop by the scope of the thin film or connect disc on both sides of the piston hydraulic sent automatically adjust the import and export. In recent years it has appeared some new pressure reducing valve, such as fixed than type relief valves. Fixed than decompression principle is to use the body of piston floating in the water pressure ratio control, import and export import and export side than the decompression is inversely proportional to the piston area ratio. This kind of pressure reducing valve is stable and no vibration; work The body without springs, so there's no spring rustily, metal fatigue failure concentrations of; Good sealing property not leaking, and therefore is minus dynamic pressure （water flow） and reduce static pressure （flow is 0）; Especially in the meanwhile does not affect water pressure.
Pressure reducing valve （usually have a variety of specifications, such as ~ DN100 before and after work the pressure 1MPa and respectively for < 0.1 ~ 0.5 MPa, pressure regulating range error of + 5% ~ 10%.
Germany valve selection lik lake
The valve inlet pressure fluctuation should be controlled in inlet pressure of a given value 80% ~ 105%, such as more than the range, the relief valve's performance will be affected.
1. Usually the valve pressure P2 after valve should be less than 0.5 times before the valve pressure, namely P2 < 0.5, P1.
2. The relief valve's only in certain per a spring of export pressure range applicable, beyond the range should replace the spring.
3. Working temperature is higher in the medium of occasions, general selection pilot type piston valve or pilot type corrugated pipe pressure reducing valve.
4. Medium for air or water （liquid） occasions, general appropriate chooses direct action film type valve or pilot type film type relief valves.
5. Medium for steam occasions, appropriate chooses pilot piston valve or pilot bellows type relief valves.
6. In order to operate, adjustment and maintenance convenience, pressure relief valves should be generally installed in horizontal pipe runs.
According to the use and the type of valve request selected pressure regulating accuracy, again according to need maximum output flow choose its size. Decision air pressure, the greater should make its highest output pressure 0.1 MPa. In water valve general installation after the air filter, oil mist device, or set values for the device, and pay attention not to before its import and export after reverse; Valve should be the knob relax when not in use, lest diaphragm often pressurized and influence its performance. Deformation
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