The self-operated pressure regulating valve does not need other external energy sources such as power source and gas source, and is driven by the energy of the medium itself. It is energy-saving and environmentally friendly, and is easy to use. After the installation is completed, the pressure value can be set to be put into automatic operation, and the control precision is required. Not high, but also lack of power, gas source occasions, more and more widely used.
This type of valve also needs to be properly selected and properly installed and used to ensure that no problems arise after it is put into operation. Needless to say, the selection valve is used to control the pressure behind the valve before the valve, the medium is normal temperature and high temperature, whether it is corrosive, the highest working pressure, etc., must be clear in advance, we mainly talk about installation Use aspect issues. I recently encountered a problem with the use of a self-operated pressure regulating valve, which is very representative.
The valve is used on the steam pipe, and it takes only one or two months to put it into use, and the user will repair it. When I saw it at the scene, a large amount of steam was discharged from the vent hole of the regulating valve head, which was extremely noisy and the sound was amazing. The cause of the accident was apparently that the steam did not condense and went directly into the membrane head, which burned the membrane. ? (Use of self-operated pressure regulating valve)
For steam pipe self-operated pressure regulating valve, a condensing tank must be added between the actuator and the pipeline during installation. Steam should not be allowed to enter the actuator head. The regulating valve must be installed face down, and the condensing tank should be higher than the membrane head. For the first time, be sure to fill the condensate tank and the membrane head with water. Look at the site installation method, ask the on-site instrument personnel, these are no problem, then what is the cause? It is puzzling. Later, I carefully inquired about an operator. Unintentionally, after the valve was installed and put into use, the copper pipe joint between the condensation tank and the film head was intermittently leaking. It turns out that the water leaks slowly in the condensation tank, and the steam enters the membrane head and burns out the membrane.
It can be seen that when using the self-operated pressure regulating valve on the steam pipeline, it is necessary to pay more attention to the installation and maintenance. In order to ensure the normal operation of the regulating valve, the joint should not be leaked, and the condensation tank should not be dehydrated. Regular inspection should be carried out. add water. In fact, it is a self-operated pressure regulating valve, which is another self-operated regulating valve. It should also be used for maintenance and maintenance when using it. (Use of self-operated pressure regulating valve)
In addition, the steam pressure is higher, it is better to use the piston type actuator, instead of the membrane type actuator, the diaphragm can generally withstand the pressure not more than 0.4mpa, and can be used later, but the service life is greatly reduced.
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