How does a balancing valve work

The principle of operation of a balancing valve is based on changing the flow area by a valve-seat pair. A threaded stem is located in a plane perpendicular to the axis of the pipeline, on which the valve is pivotally mounted. The plane of the valve is parallel to the axis of the pipeline. A fixed threaded nut is provided in the body of the balancing valve, forming a working pair with the stem.

Rotation of the adjustment handle transmits a torque through the stem and fixed threaded nut, converting it into a linear motion of the valve, which moves from the extreme lower position to the extreme upper position. In the extreme lower position, the valve sits tightly on the seat in the body of the balancing valve, hermetically cutting off the flow.

Depending on the parameters of the working medium, the hermetic sealing of the flow by the balancing valve is achieved by sealing between the valve and seat using fluoroplastic or rubber rings, or by a metal-to-metal type.

Changing the flow area affects the resistance of the valve to water flow, changing the flow rate capacity of the balancing valve Kv. The dependence of the flow rate capacity on the position of the valve is given in the technical specifications of balancing valves.

The difference between a balancing valve and a shut-off valve (a gate valve) is that for most gate valve designs, operation with an intermediate valve position is not allowed, whereas for a balancing valve, it is allowed.

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