1, the working principle of dynamic balance valve By changing the balance of valve spool flow area to adapt to the changes before and after the valve, so as to achieve the purpose of controlling the flow. Dynamic balance valve is a local resistance can change the throttle element, for the flow of incompressible fluid to simplify the flow equation is: Q = KA (△ P) Where: Q - flow through the balance valve; K - valve open Degree of flow coefficient; A - the spool of the flow area △ P - the valve inlet and outlet pressure differential Because the valve opening unchanged under the premise of the change of K value is negligible, so the valve flow should be constant Control A (△ P) unchanged. The balance valve consists of a variable flow area of ​​the valve gall bladder and high precision (± 5%) of the spring and support device. The effect of the spring pressure difference automatically controls the size of the over-flow area on the bile to keep the flow through the valve constant. 2, the valve work process: When the balance valve before and after the pressure drop is less than the minimum start pressure is not compressed spring, the largest circulation area. When the valve before and after the pressure difference in the working range of the valve gall bladder compression spring, into the working state, the water flows through the hole on both sides of the valve gall bladder and the geometry of the passage through the valve gall bladder in motion, both sides of the geometry flow channel changes - The circulation area of ​​the valve body is constantly changing, and the flow of water is basically kept constant within the range of this pressure difference. When the differential pressure across the front and back of the valve is beyond the scope of work, the valve gall bladder completely compressed spring, the flow of water only from the round hole on both sides of the valve gall bladder, gall bladder valve into a fixed regulator, flow and pressure is proportional to pressure The difference increases and increases. The dynamic balancing valve has the characteristics of limiting the maximum flow rate and automatic constant flow rate of the air-conditioning terminal equipment within a certain pressure range, simplifying the system debugging and shortening the debugging in the project of large engineering, complex and air-conditioning heating load is not constant time. In particular, the balance valve is used in the outflow water system to balance the hydraulic conditions easily and meet the requirements of the design environment temperature. In the operation of the air conditioning system, the end devices can not interfere with the start and stop of other ends. More Keywords Search: Valve
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