自力式壓力調節閥門的使用
Application of self operated pressure regulating valve
自力式壓力調節閥因為不需要其它外來能源如電源、氣源，僅靠介質自身的能量來驅動，既又，使用方便，安裝完畢后設定好壓力值即可投入自動運行，所以在對控制精度要求不高，又缺乏電源、氣源的場合，得到了越來越廣泛的使用。
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.
不過，這種閥門也需正確選型和正確安裝、使用，才能保證投入運行后不出現什么問題。選型方面就不用多說了，比如調節閥是用來控制閥前壓力還是閥后壓力，介質是常溫還是高溫，有無腐蝕性，工作壓力等等，一定要事先搞清楚，我們主要談談安裝使用方面的問題。因為我更近碰到一例自力式壓力調節閥的使用方面出現的問題，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.
閥門是用在蒸汽管道上的，投入使用才短短一兩個月，用戶就報修。到現場一看，大量蒸汽從調節閥膜頭的排氣孔中排出，噪聲極大，聲勢驚人。事故原因，明顯是蒸汽沒經過冷凝，直接進入膜頭，燒壞了膜片。
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壓力調節閥，安裝時必須在執行器和管道之間加一個冷凝罐，不能讓蒸汽進入執行器膜頭，而且，調節閥必須頭朝下安裝，冷凝罐要高于膜頭，初次使用，一定要將冷凝罐和膜頭中加滿水。看現場的安裝方式，詢問現場儀表人員，這些都沒問題，那么是什么造成的呢？令人百思不得其解。后來，仔細詢問了一個操作工，無意之下得知：這臺閥門安裝、投入使用后，冷凝罐和膜頭之間的銅管接頭一直在斷斷續續地漏水。原來是這樣，漏水導致冷凝罐里的水慢慢漏光，蒸汽就進入膜頭，燒壞了膜片。
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.
由此可見，自力式壓力調節閥在蒸汽管道上使用時，安裝、維護方面一定要多加注意，為保證調節閥正常運行，千萬不能讓接頭漏水，不能讓冷凝罐缺水，要定期檢查，適時加水。其實，不光是自力式壓力調節閥，就是其它的自力式調節閥，在使用時也需注意維護和保養才行。
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，蒸汽壓力如果較高，更好選用活塞式執行器，而不取薄膜式執行器，因為膜片一般能承受的壓力不超過0.4Mpa，過此雖然能用，卻要大大降低使用壽命。
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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