Date：2022-02-12
The self operated pressure regulating valve 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, the regulating valve is used to control the pressure in front of the valve and the pressure behind the valve. The medium is normal temperature and high temperature, whether it is corrosive, high working pressure, etc. we must find out in advance. We mainly talk about the installation and use.
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 easy to use. After installation, the pressure value can be set and put into automatic operation. It has low requirements for control accuracy and is lack of power supply and gas source, so it is more and more widely used.
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 did not condense and directly entered the membrane head, burning the membrane.
For the self operated pressure regulating valve of steam pipeline, a condensate tank must be added between the actuator and the pipeline during installation. Steam cannot enter the membrane head of the actuator. The regulating valve must be installed head down. The condensate tank must be higher than the membrane head. For initial 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. Then what is the cause? It's puzzling. Later, I asked an operator carefully and inadvertently learned 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 water leakage in the condensate tank, and the steam entered the membrane head and burned the membrane.
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. It is not only a self operated pressure regulating valve, but also other self operated regulating valves. Pay attention to maintenance when using. In addition, the steam pressure is high, so the piston actuator is preferred instead of the diaphragm actuator. The diaphragm can generally withstand a pressure of no more than 0.4MPa, which can be used, but the service life should be greatly reduced.
