原文：
            锅炉输出蒸汽后,在管道内输送一般压力较高。到达用户端后,要进行减压后才能供负载使用。目前，大多数用户采用的是在分汽缸前端管路上加装机械式减压阀进行的，这种方法虽然简单，但大多存在一些不能克服的缺点，而且进口减压阀价格也不菲。

     机械式减压阀一般存在以下缺点： 1、 蒸汽负荷流量小或者无流量情况下后端蒸汽压力会逐渐上升，不能维持设定压力。 2、 管路内凝结水较多的情况下，会出现动作不可靠的情况。 3、 压力设定调节不直观、不方便，在安装位置较高情况下，根据负载需求变化调整起来不方便，不能远距离操作调整。 4、 不能自动关闭蒸汽。一些负载在停电时或存在气动蝶阀安全隐患情况下需要立即停汽，机械式减压阀不能做到。 5、 机械式减压阀压力调节范围受限制，对一些压力要求特别低负载不能达到要求。 6、 故障率较高。易出现毛细管或平衡孔堵塞、膜片变形、破裂、泄漏等情况。针对以上问题，我专门设计了西门子蒸汽电动阀进行蒸汽减压的改造方案，使用此方案进行蒸汽压力调节实施两年来运行稳定，为出现过故障，很好的解决了以上故障。

\      具体方案如下： 1、 管路连接图元件清单：① P 蒸汽源 ② SF1 2 3 手动截止阀 ③ GLQ 过滤器 ④ DF 西门子电动蒸汽阀 VVF45.504 ⑤ P1 2 3 压力表 ⑥ FQG 蒸汽分汽缸 ⑦ L1 2 3 蒸汽负载

     2、 电路图 元件清单：① K1 断路器 2P 5A ② K2 断路器 气动闸阀1P 3A ③ KZQ 数字回路调节器 RKC CD901 ④ CGQ 压力传感器 西门子 OBE2000-P16 ⑤ T 变压器 220VAC/24VAC 150AV ⑥ ZXQ 电动阀执行器 西门子 SKD65

      3、 RKC控制器参数设置 ①、PID只可根据负载实际情况手动设定，也可有自动演算(ATU)功能完成。 ②、SL1输入类型选择电压0～5V电压输入(1110)。 ③、SL4第一警报模式选择使用上偏差报警（0001）。 ④、SL6控制输出类型选择4～20mA气动控制阀连续输出（0111）。 ⑤、SL7报警继电器状态选择设为01，即报警时报警1有NC变为NO。 ⑥、SLH设定测量范围上限为8.00，即对应0.8Mpa。 ⑦、SLL设定测量范围下限为0.00，即对应0Mpa。 ⑧、PGDP设定为2位小数。 ⑨、其他参数使用缺省值即可。

     4、 注意事项 ① 、注意电动阀执行器的选择要参考汽源压力和设定压力，执行器型号要和压差大小相配合，否则，可能关不严或打不开。 ② 、压力传感器应安装在分汽缸上，气动闸阀要有表弯及一段引出管，避免传感器受到冲击和温度过高，减少使用寿命。 ③ 、4～20mA控制信号串入AL1再到执行器是为了在压力相对于设定值过高，超出报警值时，通过AL1动作断开控制信号，使电动阀完全闭合。 ④ 、现有设定SL1,SLH,SLL决定了测量范围在0～8Mpa之间，电动调节阀传感器可以测量至1.6Mpa，如果需要更大测量范围，需要通过外部线路对输入信号进行转换，并对SLH、SLL重新进行设定。 ⑤ 、测量显示稍有误差时可通过PB值进行校准。此方案压力显示、设定直接在控制器上进行，调节使用方便，压力波动小，运行可靠，对节省蒸汽能耗也有一定帮助。价格较进口机械式减压阀稍低，是一种值得推广的方法。缺点就是必须需要电源，没有电源的地方无法使用。

“ Siemens electric valve in the steam vacuum application ”是由中国闸阀网提供的阀门行业新闻，译文仅供参考。另外，中国闸阀网还提供相关产品搜索： 电动闸阀、 手动闸阀、 气动闸阀、 楔式闸阀、 刀形闸阀（刀闸阀）等。

译文：
          Output of the steam boiler, the pressure in the pipe conveying the general higher. To reach the client after decompression can be carried out for load. Currently, most users use the sub-cylinder front-end pipeline for the installation of mechanical valve, the method is simple, but most can not overcome the shortcomings of some existing, and cheap imports Jian Yafa prices. Mechanical valve generally of the following disadvantages: 1, the steam load flow case of small or no flow will gradually increase back-pressure steam, can not maintain the set pressure. 2, pipe condensation of water more often, there will be movement unreliable. 3, the pressure setting adjustment is not intuitive, convenient, high in the case of the installation location,MUD VALVES depending on the load inconvenient to adjust to changes in demand, remote operation can not be adjusted. 4, can not automatically turn off the steam. Some of the load in the power outage or a security risk situations requiring immediate stop gas, mechanical valve can not do. 5, mechanical valve pressure adjustment range is restricted to some special low pressure to the load can not meet the requirements. 6, a higher failure rate. Prone to capillary or balance holes to plug, patch deformation, rupture, leakage and so on. To solve the above problem, I designed a Siemens steam electric steam decompression valve rehabilitation programs,MUD VALVES Shiyong this program to regulate the implementation of the steam Ya Li Liang Nian Lai Yunhangwending, Wei Chu Xian Guo Gu Zhang, well solve the above fault. Specific programs are as follows: 1, pipe connection diagram Component List: ① P steam source ② SF1 2 3 manual valve ③ GLQ filter ④ DF Siemens electric steam valve VVF45.504 ⑤ P1 2 3 sub-cylinder steam pressure gauge ⑥ FQG ⑦ L1 2 3 steam load 2, circuit diagram Component List: ① K1 circuit breaker 2P 5A ② K2 breaker 1P 3A ③ KZQ digital loop controller RKC CD901 ④ CGQ pressure sensor Siemens OBE2000-P16 ⑤ T transformer 220VAC/24VAC 150AV ⑥ ZXQ Siemens SKD65 electric valve actuator 3, RKC controller parameter ①, PID can only be set manually load the actual situation may also have automatic calculation (ATU) function to complete. ②, SL1 input type selection voltage 0 ~ 5V voltage input (1110). ③, SL4 first use of alarm mode selectionREDUCING VALVES bias Alarm (0001). ④, SL6 control output type selection 4 ~ 20mA continuous output (0111). ⑤, SL7 select Set alarm state relay 01, the NC alarm Alarm 1 has become NO. ⑥, SLH set the measuring range upper limit was 8.00, which corresponds to 0.8Mpa. ⑦, SLL set measuring range lower limit is 0.00, which corresponds to 0Mpa. ⑧, PGDP set to 2 decimal places. ⑨, other parameters you can use the default values. 4 Notes ①, pay attention to the choice of electricSAFETY VALVES valve actuators to set the reference pressure and pressure steam source, actuators and pressure models to match the size, otherwise, may not strictly relevant or not open. ②, pressure sensors should be installed in the sub-cylinder, the curved table and to have a lead to control, to avoid the impact and temperature sensors were too high, reduce the service life. ③, 4 ~ 20mA control signal AL1 in series and then to the actuator relative to the pressure setting too high, exceeding the alarm values, AL1 action by disconnecting the control signal, so that electric valve completely closed. ④, the existing set SL1, SLH, SLLMULTI-FUNCTIONAL WATER PUMP CONTROL VALVE determines the measurement range of 0 ~ 8Mpa between the sensor can be measured to 1.6Mpa, if you need a larger measuring range, through an external circuit to convert the input signal, and SLH, SLL re-set. ⑤, measurements show that even the slightest error value may be calibrated by PB. This program shows the pressure, set directly on the controller to regulate the easy to use, the pressure fluctuation is small, reliable operation of the steam energy savings will also help. Price slightly lower than the imported mechanical valve is a useful method. Drawback is the need to require power, can not be used where there is no power.

原文来源：http://www.1zhafa.com/

2010-08-31 07:05

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