译文：
一、机械式减压阀存在的缺点： 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。 二、西门子电动阀在蒸汽减压中的高效应用： 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、元件清单：① K1 断路器 2P 5A ② K2 断路器 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{dy}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，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xx闭合。 ④ 、现有设定SL1,SLH,SLL决定了测量范围在0～8Mpa之间，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。西门子蒸汽电动阀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。

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原文：
First, the shortcomings of mechanical valve: Boiler output steam after the normal stresses of a higher transmission pipeline. After the arrival the client will be conducted after decompression can be used for the load. At present, most users are used in the sub-cylinder front-end pipes on the road for installation of mechanical valve, and this method is simple, but most can not overcome some shortcomings, but also a lot of money importing valve price. Mechanical valve in general there is the following disadvantages: 1, steam load flow or no flow situation of small vapor pressure will gradually increase its back-end, unable to maintain set pressure. 2, pipe condensation of water within the larger context, there will be movement unreliable. 3, the pressure setting adjustment is not intuitive, inconvenient location of the installation of a high case, depending on the load up and inconvenient to adjust to changes in demand and can not adjust the long-distance operation. 4, does not automatically turn off the steam. Some of the load during power outages or where there are security risk situations where the need to immediately stop gas, mechanical valve can not do. 5, mechanical valve pressure adjustment range is restricted to some pressure to the special low-load can not meet the requirements. 6, a high failure rate. Readily from capillary or balance holes to plug, diaphragm deformation, rupture, leakage and so on. 2, Siemens electric valve in the steam decompression of high-performance applications: To solve the above problem, I designed a Siemens steam valve to steam electric transformation decompression program, use this program to the steam pressure regulator to run two years of stability, there have been failures, a very good solution to the above failures. Specific programs are as follows: 1, pipeline connection diagram Component List: ① P steam source ② SF1 2 3 manual valve ③ GLQ filters ④ DF Siemens electric steam valve VVF45.504 ⑤ P1 2 3 gauge ⑥ FQG sub-cylinder steam steam load ⑦ L1 2 3 2, components list: ① K1 circuit breaker 2P 5A ② K2 breaker 1P 3A ③ KZQ digital loop regulator 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 setting ①, PID can only be set manually according to load the actual situation, but also may 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 selection bias Alarm (0001). ④, SL6 control output type selection 4 ~ 20mA continuous output (0111). ⑤, SL7 alarm relay state selector set to 01, that is, there is an alarm when the alarm NC becomes NO. ⑥, SLH set the measuring range limit for 8.00, that corresponds to 0.8Mpa. ⑦, SLL set the measuring range limit of 0.00, that corresponds to 0Mpa. ⑧, PGDP is set to 2 decimal places. ⑨, other parameters you can use the default values. 4 Notes ①, note that the choice of electric valve actuator to refer to steam source pressure and the set pressure, actuator models and the pressure to match the size, otherwise, may be closed or not open lax. ②, pressure sensors should be installed on the sub-cylinder, there must be led to the table and a section of curved pipe, to avoid the impact and temperature sensors were too high, reducing service life. ③, 4 ~ 20mA control signal string into the AL1 and then to the actuator to the pressure relative to the set value is too high, exceeding the alarm values, through the disconnect control signal AL1 motion, so that electric valve completely closed. ④, the existing set SL1, SLH, SLL determines the measurement range of 0 ~ 8Mpa between the sensors 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 to re-configure it. ⑤, measurements show that even the slightest error may be calibrated through the PB values. This program displays 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. Siemens Steam Electric valve price slightly lower than the imports of mechanical valve is a way worthy of promotion. Drawback is the need to require power supply, can not be used where there is no power supply.