Working Process and Principle of Dynamic Balancing Valve

Ⅰ. Principles of dynamic balancing valve

To achieve flow control, the dynamic balancing valve spool overflow area is adjusted to accommodate changes of the dynamic balancing valve.

For an incompressible fluid, the dynamic equilibrium valve is a throttling element that changes the local resistance. Q=KA (△P), where Q is the balancing valve flow, K is the flow coefficient, A is the spool over-flow area, and △P is the difference in valve import and export pressure.

When the dynamic balancing valve opening degree remains constant, the K value change can be ignored. As a result, the A (△P) constant is maintained by the dynamic equilibrium valve flow rate. A support device, a high precision spring, and an over-flowing valve bore make up the dynamic balancing valve. The valve flow rate is constant because the differential pressure on the spring controls the over-flow size of the valve bore.

Ⅱ. Working process of dynamic balancing valve

The spring is not compressed if the minimum start pressure difference is more than the change of pressure difference of dynamic balancing valve. At this time, the circulation area is the largest.

The spring is compressed by the valve bile and is in functioning condition if the change of differential pressure of the dynamic equilibrium valve is within the working range, and the round hole and geometric type channel on both sides of the valve bile pass through the water flow. The geometric flow type channel changes when the valve bile moves and the valve circulation area of dynamic balancing valve changes as well. The flow of water can be nearly continuous in this compression range.

If the change of pressure difference of the dynamic equilibrium valve exceeds the working range, the valve bile fully compresses the spring, leaving only the two sides of the valve bile round hole with water flow, i.e., the valve bile serves as a fixed regulator, the pressure difference and flow are proportional, and as the pressure difference increases, so does the flow.

The dynamic equilibrium valve regulates the maximum flow at the end of the air conditioner over a specific pressure range, allowing the flow to be automatically constant, the load of the air conditioning and heating to be unstable, system commissioning to be simplified, and commissioning time to be reduced. In the case of a heterogeneous water system, a dynamic balancing valve can achieve the design of the ambient temperature, hydraulic conditions balance, and other end start and stop on the operation of the end of the air conditioning system equipment without causing an impact.

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