ΘSelf -operated pressure regulating valve working principle (post-valve pressure control) The pre-valve pressure P1 of the working medium passes through the throttle after the valve core and the valve seat, and becomes the post-valve pressure P2. P2 is input into the lower 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, which determines the relative position of the valve core and the valve seat, and controls the pressure behind the valve. When the post-valve pressure P2 increases, the force acting on the top plate of 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 reaction force of the spring. At this time, the flow area of ​​the valve body and the valve seat is reduced, and the flow resistance is increased, so that P2 is lowered to a set value. Similarly, when the post-valve pressure P2 is lowered, the action direction is opposite to the above, which is the working principle of the self-operated (post-valve) pressure regulating valve. ΘSelf-operated pressure regulating valve working principle (pre-valve pressure control) ΘSelf-operated temperature control valve working principle (heating type) The temperature regulating valve works according to the principle of incompressibility and thermal expansion and contraction of liquid. The self-operated temperature regulating valve for heating, when the temperature of the controlled object is lower than the set temperature, the liquid in the temperature pack shrinks, the force acting on the actuator push rod is reduced, and the valve core member opens the valve under the action of the spring force. Increase the flow rate of heating medium such as steam and hot oil, so that the temperature of the controlled object rises until the temperature of the controlled object reaches the set value, the valve closes, after the valve is closed, the temperature of the controlled object drops, the valve opens again, and the heating medium is again Entering the heat exchanger, the temperature is raised again, so that the controlled object temperature is a constant value. The valve opening degree is related to the difference between the actual temperature and the set temperature of the controlled object. ΘSelf-operated temperature control valve working principle (cooling type) The working principle of the self-operated temperature regulating valve for cooling can be referred to the self-operated temperature regulating valve for heating. However, when the valve core member is opened and closed under the action of the actuator and the spring force, the valve body passes through the cold medium and is mainly used. Temperature control in the cooling unit. ΘSelf-operated flow control valve working principle After the controlled medium is input to the valve, the pre-valve pressure P1 is input to the lower diaphragm chamber through the control line, and the pressure Ps after the throttling of the throttle valve is input to the upper membrane chamber. The difference between P1 and Ps is ΔPs=P1-Ps, which is called effective pressure. . The thrust generated by P1 acting on the diaphragm and the thrust difference generated by Ps acting on the diaphragm are balanced with the spring reaction force to determine the relative position of the spool and the valve seat, thereby determining the flow rate through the valve. When the flow rate through the valve increases, that is, ΔPs increases, as a result, P1 and Ps act on the lower and upper membrane chambers respectively, so that the valve core moves toward the valve seat, thereby changing the flow area between the valve core and the valve seat, so that The Ps is increased, and the increased thrust of the Ps acting on the diaphragm plus the spring reaction force and the thrust of the P1 acting on the diaphragm are balanced at a new position to achieve the purpose of controlling the flow. On the contrary, the same reason. Setting the flow rate of the controlled medium is determined by adjusting the relative position of the throttle valve and the valve seat. This article is reproduced from: http://
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The pre-valve pressure P1 of the working medium passes through the throttle after the valve core and the valve seat, and becomes the post-valve pressure P2. At the same time, P1 is input into the upper chamber of the actuator through the control pipeline and acts on the top plate. The generated force is balanced with the reaction force of the spring, which determines the relative position of the valve core and the valve seat, and controls the pressure before the valve. When the post-valve pressure P1 increases, the force of P1 acting on the top plate 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 moves away from 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 of ​​the valve body and the valve seat is reduced, and the flow resistance is reduced, so that P1 is lowered to a set value. Similarly, when the post-valve pressure P1 is lowered, the action direction is opposite to the above, which is the working principle of the self-operated (pre-valve) pressure regulating valve.
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