原文：
         一、活塞式流量调节阀的特点及工作原理：

　　德国VAG阀门公司生产的RKV、RKV RIKO活塞式流量调节阀。活塞式流量调节阀与只用作管线切断的蝶阀和闸阀不同，活塞阀是能满足各种特殊调节要求的阀门。其调节功能是靠一类似于活塞状圆柱体在阀腔内作轴向运动来实现的，它的行程与管内水流方向是一致的。水流从轴向弧状进入外壳，活塞阀内的流道为轴对称形，流体流过时不会产生紊流。流道面积的改变是通过一个活塞沿管道轴向做直线运动实现。隔膜阀无论活塞在何位置，阀腔内的水无论活塞运动到任何位置，阀腔内无论任何位置的水流断面均为环状，在出口处向轴心收缩，从而达到最佳防气蚀，从而避免因节流而可能产生的气蚀对阀体和管道的破坏。

　　活塞阀阀体设计成一个整体，具有高流通能力，开度与流量成线性关系，能有效地避免气蚀和震动。内壳有流线型的导流肋和外壳相连，不锈钢活塞被可靠导引滑动，杜绝产生倾斜或运行不畅。内壳上游的端面成球形，使水流形成一个渐变过程，活塞用安装在壳内的曲柄连杆来操作。活塞阀采用金属对金属及金属与橡胶双重密封，实现双向气泡级密封。因此从而达到密封系统使用寿命长，关闭严密。

 　　由于活塞阀的结构特殊，根据运行工况的不同，阀的过水特性可以用阀下游出水口出口部件的型式来调节(可更换出口部件)，旋塞阀从而适应不同目的的工况要求，达到最佳的调流效果。涡街流量计

 　　二、活塞式流量调节阀的应用：

　　出口调节型部件有四种：

 　　1、第一种E型，具有截弯取直和沿端座下游横截面突然放大结构，从而消除气蚀破坏。适用于控流，高压差，背压大的场合，电磁阀而截弯取直，横截面突然放大结构可以减小气蚀效应。

 　　2、第二种S型，其关闭的导向部件有开槽的套筒。适用于控流、调节高压差及足够的背压大的场合，它的调节性与流体状态匹配，可以达到较佳的效果。

 　　3、第三种F型，在阀体出口部分具有短扩散管作用，柱塞阀 适用于调节及启闭场合，起到开关作用。启闭时水头损失非常小，完全开启时阻力小。

　　4、第四种LH或SZ型，在阀腔内的活塞关闭的导向部件安装了有防气蚀的多孔环网，适用于调节、防气蚀、高压差、背压小(蓄水池入口处)， 疏水阀它的控流调节特性和运行工况要求最佳匹配，从而达到了消除气蚀效应。

 　　5、VAG活塞阀在引水方面可以用作泄放阀和防爆管阀，在贮存时VAG活塞阀LH型、E型可以用作液位或压力调节阀，在输水上VAG活塞阀LH型、S型可以用作流量调节阀，E型，LH型或SZ型可用作放净阀或灌管阀，在污水、水处理VAG活塞阀可以用作泵启动保护阀，或是配备特殊的调节出口部件，也可以用在水处理厂的流量调节阀，E型活塞阀亦可以用作污水处理厂气量调节阀，在供水上VAG活塞阀根据液态工况采用不同的出口部件，用作压力/流量调节阀，例如管网压力平衡。

“ Piston valves for the working principle and application ”是由中国调节阀网提供的国际阀门新闻，译文仅供参考。另外，中国调节阀网还提供相关产品搜索： CV3000调节阀、 电动调节阀、 执行器和附件、 更多调节阀产品、 调节阀价格等。

译文：
           Routine maintenance on vehicles, air filter and pressure control valve PCV easier to ignore. Also, often when they endanger the engine block and normal work, will be subject to remedial maintenance like replacement. In order to avoid premature engine wear (non-normal) and maintain the best working conditions, on the air filter and PCV valve pressure regulator regular inspection and replacement appearsSafety valves to be essential. We emphasize preventive maintenance on the air filter is not an exaggeration. Inhalation of air and fuel mixture before the air filter to filter the air of dust, carbon and other debris, thereby ensuring clean air inhalation. In fact, per unit volume of fuel burning, some need to have 1 million units of volume of air through the filter. And another small dirt particles can cause serious engine wear and tear related to internal components. Usually, manufacturers recommend regularMud Valves maintenance of air filter replacement period is 48 000 km, and every 24,000 km for a routine check; its conservative maintaining the recommended replacement cycle for 24 000 km. Density of the atmosphere contains three kinds of basic particles of different pollutants, namely dust, debris and soot. In the open highway, the dust content areas than in rural areas and building low. Dust concentration in the larger region, air filter inspection and Balance valvesreplacement frequency is higher. Highways and traffic congestion in the area, because emissions from vehicles concentrated, so the air in the carbon content was high. When conducting routine oil changes, incidentally, check the air filter after all, a best of both worlds for good practice. At this point, won the filter, look carefully inside the depths of its folds. Sometimes, the external filter looks clean, but the interior has been very dirty, and then must be replaced immediately. PCV system into the crankcase blow-by gas mixture into the intake system, and then secondary combustion in the combustion chamber. Over time, engine oil, gasoline and other concentrates, deposition in the PCV valve into the sludge within the gel, resulting in PCV valve Gauge Valvesplug, thereby increasing the gas pressure inside the crankcase. Enhance the result of the pressure oil from the seal or seals of leaking, causing additional leaks oil consumption and engine failure. In addition, increased pressure on the crankcase vapors through the PCV make a sticky oil and HC compounds, particulate air filter, will certainly lower the accuracy of its proper filtration. When adhesions PCV foreign bodies can not be completely closed, not the right amount of air into the combustion chamber will be, and then diluting the air / fuel mixture, leading to deterioration of the car and easy to turn off idle performance. Most manufacturer's recommended normalGlobe Valves maintenance and PCV valve replacement cycle is 96 000 km; conservative replacement cycle for the maintenance of 48,000 km. In any case, check the air filter at the same time, be sure to test whether the PCV valve clogging and binding. Ford PCV valve replacement cycle depending on the recommendation of the different models of 9.6 ~ 160 000 km range; GM also provided according to different models corresponding recommended PCV valve replacement cycle, its value range broader. When you repair vehicles on the ongoing PCV valve replacement cycle when there are concerns, please access the owner's manual or maintenance information.

原文来源：http://www.1tiaojiefa.com/

2010-08-30 07:25

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