Application range and structure principle of self-operated control valve
The self-operated pressure regulating valve does not require other external energy sources such as power and gas sources, and is driven by the energy of the medium. In the absence of power and gas sources, it has been used more and more widely. During use, we must pay attention to the particularity of the selection, otherwise it may easily cause accidents. In the process of use, pay attention to the selection and installation environment, so it is very important to understand the working principle and structure of the self-operated pressure regulating valve in detail.
1. Structure and working principle
The pre-valve pressure P1 of the process medium passes through the throttling of the valve core and the valve seat, and then becomes the post-valve pressure P2. P2 enters the lower membrane chamber of the actuator through the control line and acts on the top plate. The generated force is balanced with the reaction force of the spring. Determines the relative position of the valve core and valve seat. Control the pressure behind the valve. When the pressure P2 behind the valve increases. The force of P2 on the top plate also increases. at this time. The force of the top plate is greater than the reaction force of the spring. Close the valve core to the valve seat. Until the force of the top plate is balanced with the reaction force of the spring. At this time. The flow area between the valve core and the valve seat is reduced. The flow resistance becomes larger. Thereby, P2 is reduced to the set value. Similarly, when the pressure P2 decreases after the valve. The action direction is opposite to the above. This is how the pressure behind the valve works. When the setting value of the pressure P2 behind the valve needs to be changed. Adjustable adjusting nut 8.
2.Use and scope
The self-operated pressure regulating valve is an energy-saving product that does not require external energy and automatically relies on the pressure change of the regulating medium to automatically adjust the pressure. With comprehensive functions of measurement, execution and control. Widely used in petroleum, chemical, metallurgy, light industry and other industrial sectors and urban heating and tritium supply systems. This product can be used in non-corrosive (max. 350 ¡ã C) pressure control devices for liquids, gases and vapors.
3. Technical characteristics:
The self-operated pressure regulating valve is an actuator product that does not require any additional energy and uses the energy of the medium being adjusted to achieve automatic adjustment. The biggest feature of this product is that it can work in places without electricity and air, while saving energy, and the pressure setting can be adjusted at will during operation. With fast opening flow characteristics, it is sensitive in action and has good sealing performance. Therefore, it is widely used in various industrial equipment such as petroleum, chemical, electric power, metallurgy, food, light textile, machinery manufacturing and residential building groups. Steam medium pressure reduction, voltage stabilization (used for post-valve adjustment), or pressure relief, pressure holding (used for pre-valve adjustment) automatic control. The attached condenser can be used at a temperature of ≤350 ℃.
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