# The working process and principle of dynamic balance valve

The working process and principle of dynamic balance valve
The dynamic balance valve is suitable for flow control of non-corrosive liquid media such as heating and air conditioning. The following will introduce some knowledge points about the working process and principle of dynamic balance valve:

Dynamic balance valve working process
When the pressure difference before and after the balance valve is less than the small starting pressure difference, the spring is not compressed and the flow area is large. When the pressure difference between the front and rear of the valve is within the working range, the valve bladder compresses the spring and enters the working state, and the water flows through the circular holes and geometric channels on both sides of the valve bladder; due to the movement of the valve bladder, the geometric flow channels on both sides also change accordingly— The flow area of ​​the valve body is constantly changing, and the water flow rate remains basically constant within this pressure difference range. When the pressure difference between the front and rear of the balance valve exceeds the working range, the valve bladder completely compresses the spring, and the water flow only flows through the round holes on both sides of the valve bladder. At this time, the valve bladder becomes a fixed regulator, and the flow rate is proportional to the pressure difference. The difference increases as the difference increases.
The dynamic balance valve has the characteristics of limiting the large flow and automatic constant flow of the air-conditioning terminal equipment within a certain pressure range. debugging time. In particular, the use of balance valves in different water systems can easily balance hydraulic conditions and meet the requirements of the design ambient temperature, and the terminal equipment can not be disturbed by the start and stop of other terminals during the operation of the air conditioning system.
The working principle of dynamic balance valve

By changing the flow area of ​​the valve core of the balance valve to adapt to the changes before and after the valve, so as to achieve the purpose of controlling the flow. The dynamic balance valve is a throttling element whose local resistance can be changed. For incompressible fluids, its simplified flow equation is:

Q=KA(△P)

In the formula: Q——flow through the balance valve;

K——flow coefficient of valve opening;

A——The flow area of ​​the valve core

△P——The pressure difference between the inlet and outlet of the valve
Since the change of K value is negligible under the premise that the opening of the valve remains unchanged, the flow rate of the valve should be kept constant and A(ΔP) should be controlled unchanged.
The balance valve is composed of a valve bladder with variable flow area and a high-precision (±5%) spring and support device. Under the action of the pressure difference, the spring automatically controls the size of the flow area on the valve bladder, so that the flow through the valve is constant.
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