德國(guó)萊克lik減壓閥是采用控制閥體內(nèi)的啟閉件的開度來(lái)調(diào)節(jié)介質(zhì)的流量，將介質(zhì)的壓力降低，同時(shí)借助閥后壓力的作用調(diào)節(jié)啟閉件的開度，使閥后壓力保持在一定范圍內(nèi)，并在閥體內(nèi)或閥后噴入冷卻水，將介質(zhì)的溫度降低，這種閥門稱為減壓減溫閥。該閥的特點(diǎn)，是在進(jìn)口壓力不斷變化的情況下，保持出口聽壓力和溫度值在一定的范圍內(nèi)。

德國(guó)萊克lik減壓閥廣泛用于高層建筑、城市給水管網(wǎng)水壓過(guò)高的區(qū)域、礦井及其他場(chǎng)合，以保證給水系統(tǒng)中各用水點(diǎn)獲得適當(dāng)?shù)姆?wù)水壓和流量。鑒于水的漏失率和浪費(fèi)程度幾乎同給水系統(tǒng)的水壓大小成正比，因此減壓閥具有改善系統(tǒng)運(yùn)行工況和潛在節(jié)水作用，據(jù)統(tǒng)計(jì)其節(jié)水效果約為30%。
德國(guó)萊克lik減壓閥的構(gòu)造類型很多，以往常見的有薄膜式、內(nèi)彈簧活塞式等。減壓閥的基本作用原理是靠閥內(nèi)流道對(duì)水流的局部阻力降低水壓，水壓降的范圍由連接閥瓣的薄膜或活塞兩側(cè)的進(jìn)出口水壓差自動(dòng)調(diào)節(jié)。近年來(lái)又出現(xiàn)一些新型減壓閥，如定比式減壓閥。定比減壓原理是利用閥體中浮動(dòng)活塞的水壓比控制，進(jìn)出口端減壓比與進(jìn)出口側(cè)活塞面積比成反比。這種減壓閥工作平穩(wěn)無(wú)振動(dòng)；閥體內(nèi)無(wú)彈簧，故無(wú)彈簧銹蝕、金屬疲勞失效之慮；密封性能良好不滲漏，因而既減動(dòng)壓（水流動(dòng)時(shí)）又減靜壓（流量為0時(shí)）；特別是在減壓的同時(shí)不影響水流量。
減壓閥通常有DN50～DN100等多種規(guī)格，閥前、后的工作壓力分別為＜1MPa和0．1～0．5MPa，調(diào)壓范圍誤差為±5%～10%。

德國(guó)萊克lik減壓閥的選型

減壓閥進(jìn)口壓力的波動(dòng)應(yīng)控制在進(jìn)口壓力給定值的80％～105％，如超過(guò)該范圍，減壓閥的性能會(huì)受影響。

1. 通常減壓閥的閥后壓力P2應(yīng)小于閥前壓力的0.5倍，即P2<0.5P1。
2. 減壓閥的每一檔彈簧只在一定的出口壓力范圍內(nèi)適用，超出范圍應(yīng)更換彈簧。
3. 在介質(zhì)工作溫度比較高的場(chǎng)合，一般選用先導(dǎo)式活塞式減壓閥或先導(dǎo)式波紋管減壓閥。
4. 介質(zhì)為空氣或水（液體）的場(chǎng)合，一般宜選用直接作用薄膜式減壓閥或先導(dǎo)式薄膜式減壓閥。
5. 介質(zhì)為蒸汽的場(chǎng)合，宜選用先導(dǎo)活塞式減壓閥或先導(dǎo)波紋管式減壓閥。
6. 為了操作、調(diào)整和維修的方便，減壓閥一般應(yīng)安裝在水平管道上。

根據(jù)使用要求選定減壓閥的類型和調(diào)壓精度，再根據(jù)所需zui大輸出流量選擇其通徑。決定閥的氣源壓力時(shí)，應(yīng)使其大于zui高輸出壓力0．1MPa。減壓閥一般安裝在分水濾氣器之后，油霧器或定值器之前，并注意不要將其進(jìn)、出口接反；閥不用時(shí)應(yīng)把旋鈕放松，以免膜片經(jīng)常受壓變形而影響其性能。

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