Self-operated control valve because it does not require other external energy sources such as power, gas source, the media alone to drive their own energy, energy saving and environmental protection, easy to use, set the pressure value can be put into automatic operation after installation, Control accuracy is not high, but also the lack of power, gas source of the occasion, has been more widely used. However, in the course of using, we must pay attention to the particularity of the selection, otherwise it is easy to cause an accident. In the process of using, pay attention to the use of the selection and installation environment, therefore, a detailed understanding of the working principle and structure of self-regulating valve is very important. First, the self-regulating valve structure and working principle of the process medium valve pressure P1 after spool, seat throttling, into a valve pressure P2. Valve pressure P2 through the control line into the actuator under the film on the role of the top plate. The resulting force balances the reaction of the spring. Determine the spool, the relative position of the valve seat, the pressure control valve. When the valve back pressure P2 increases, the force acting on the top plate by the valve back pressure P2 also increases. At this time, the force of the top plate is greater than the reaction force of the spring, so that the valve core is closed to the position of the valve seat until the force of the top plate is balanced with the spring reaction force. At this time, the flow area between the valve core and the valve seat is reduced, and the flow resistance is increased, so that the valve back pressure P2 is reduced to the set value. Similarly, when the valve pressure P2 decreases, the role of the opposite direction, which is the working principle of the valve after the pressure adjustment. Adjust the adjusting nut when it is necessary to change the setting of the valve back pressure P2. Second, the technical characteristics of self-regulating valve Self-regulating valve is not required any additional energy, the use of the media to be mediated by its own energy and achieve automatic adjustment of the actuator products. It sets the test, control, perform a lot of functions in a self-contained instrument control system. The most prominent feature of this product is that it can work in places without electricity and without gas while saving energy. The pressure setting can be adjusted freely during operation. Suitable for explosive dangerous environment; Simple structure, small maintenance workload, you can achieve unattended; set transmitter, controller and actuator functions in one, low prices, saving engineering investment. It is characterized by quick opening and flow characteristics, sensitive action and good sealing performance. It is widely used in all kinds of industrial equipment such as petroleum, chemical, electric power, metallurgy, food, textile, machinery manufacturing and residential buildings, Steam medium decompression, regulator (for the valve after the adjustment), or pressure relief, pressure (for the valve before the adjustment) of the automatic control. Condenser can be used at ≤ 350 ℃ temperature. Third, the type of self-regulating valve Self-regulating valve many types, according to the controlled parameters can be divided into self-pressure (differential pressure) regulating valve, self-regulating valve, self-operated temperature control valve, self-operated flow control valve Wait. Fourth, the use of self-regulating valve and the scope of application Self-regulating valve is a need without external energy but only by adjusting the media pressure changes to automatically adjust the pressure of energy-saving products. With measurement, implementation, control of the integrated features. Widely used in petroleum, chemical, metallurgy, light industry and other industrial sectors and urban heating, for the system. In the oil industry has been widely used, especially in the field of remote sites. At the same time can be used for non-corrosive (maximum temperature of 350 ℃) liquid, gas and steam and other media pressure control device.
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