自力式压力调节阀门的使用
Application of self operated pressure regulating valve
自力式压力调节阀因为不需要其它外来能源如电源、气源，仅靠介质自身的能量来驱动，既又，使用方便，安装完毕后设定好压力值即可投入自动运行，所以在对控制精度要求不高，又缺乏电源、气源的场合，得到了越来越广泛的使用。
Because the self operated pressure regulating valve does not need other external energy sources, such as power supply and gas source, it is driven only by the energy of the medium itself, which is energy-saving, environment-friendly and convenient to use. After the installation is completed, the pressure value can be set and put into automatic operation. Therefore, it has been more and more widely used in the occasions with low requirements for control accuracy and lack of power supply and gas source.
不过，这种阀门也需正确选型和正确安装、使用，才能保证投入运行后不出现什么问题。选型方面就不用多说了，比如调节阀是用来控制阀前压力还是阀后压力，介质是常温还是高温，有无腐蚀性，工作压力等等，一定要事先搞清楚，我们主要谈谈安装使用方面的问题。因为我更近碰到一例自力式压力调节阀的使用方面出现的问题，很有代表性。
However, this valve also needs to be correctly selected, installed and used to ensure that there are no problems after it is put into operation. There is no need to say more about the selection. For example, whether the regulating valve is used to control the pressure in front of or behind the valve, whether the medium is at room temperature or high temperature, whether it is corrosive, the maximum working pressure, etc., we must find out in advance. We mainly talk about the problems of installation and use. Because I recently encountered a problem in the use of self operated pressure regulating valve, which is very representative.
阀门是用在蒸汽管道上的，投入使用才短短一两个月，用户就报修。到现场一看，大量蒸汽从调节阀膜头的排气孔中排出，噪声极大，声势惊人。事故原因，明显是蒸汽没经过冷凝，直接进入膜头，烧坏了膜片。
The valve is used on the steam pipeline. It has only been put into use for one or two months, and the user will apply for repair. Upon arrival at the scene, a large amount of steam was discharged from the exhaust hole of the diaphragm head of the regulating valve, with great noise and amazing momentum. The cause of the accident was that the steam directly entered the membrane head without condensation and burned the membrane.
用于蒸汽管道的自力式压力调节阀，安装时必须在执行器和管道之间加一个冷凝罐，不能让蒸汽进入执行器膜头，而且，调节阀必须头朝下安装，冷凝罐要高于膜头，初次使用，一定要将冷凝罐和膜头中加满水。看现场的安装方式，询问现场仪表人员，这些都没问题，那么是什么造成的呢？令人百思不得其解。后来，仔细询问了一个操作工，无意之下得知：这台阀门安装、投入使用后，冷凝罐和膜头之间的铜管接头一直在断断续续地漏水。原来是这样，漏水导致冷凝罐里的水慢慢漏光，蒸汽就进入膜头，烧坏了膜片。
For the self operated pressure regulating valve used in the steam pipeline, a condensate tank must be added between the actuator and the pipeline during installation, and the steam cannot enter the membrane head of the actuator. Moreover, the regulating valve must be installed head down, and the condensate tank must be higher than the membrane head. For the first use, the condensate tank and membrane head must be filled with water. Look at the on-site installation method and ask the on-site instrument personnel. These are all OK. So what caused it? It's puzzling. Later, I asked an operator carefully and learned by accident that after the valve was installed and put into use, the copper pipe joint between the condensate tank and the membrane head has been leaking intermittently. It turned out that the water leakage led to the slow leakage of water in the condensate tank, and the steam entered the membrane head and burned the membrane.
由此可见，自力式压力调节阀在蒸汽管道上使用时，安装、维护方面一定要多加注意，为保证调节阀正常运行，千万不能让接头漏水，不能让冷凝罐缺水，要定期检查，适时加水。其实，不光是自力式压力调节阀，就是其它的自力式调节阀，在使用时也需注意维护和保养才行。
It can be seen that when the self operated pressure regulating valve is used on the steam pipeline, more attention must be paid to the installation and maintenance. In order to ensure the normal operation of the regulating valve, do not let the joint leak or the condensate tank lack water. Check regularly and add water in time. In fact, not only the self operated pressure regulating valve, but also other self operated regulating valves need to pay attention to maintenance when in use.
另外，蒸汽压力如果较高，更好选用活塞式执行器，而不取薄膜式执行器，因为膜片一般能承受的压力不超过0.4Mpa，过此虽然能用，却要大大降低使用寿命。
In addition, if the steam pressure is high, it is best to choose piston actuator instead of membrane actuator, because the pressure that the diaphragm can withstand generally does not exceed 0.4MPa. Although it can be used, it should greatly reduce the service life.
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