Self-operated flow control valve principle

The self-operated flow control valve is structurally a two-valve combination consisting of a manually adjustable valve group and an automatic balancing valve group. The function of the manual valve group is to set the flow rate, and the function of the automatic balancing valve group is to maintain the flow rate. Constant.
For a manually adjusted valve group, the flow rate is G=Kv(P2-P3). The size of Kv depends on the opening degree. If the opening degree is not changed, the flow rate G does not change, and the constant value of P2-P3 is controlled by the automatic balancing valve group. of. For example, the pressure difference between inlet and outlet P1-P3 increases, then the automatic balance valve group is turned off by the action of the pressure - sensitive film and the spring, so that P1-P2 increases, thereby maintaining the P2-P3 constant; otherwise, P1-P3 decreases, The automatic balancing valve group is opened large, so that P1-P2 is reduced, thereby maintaining the P2-P3 constant. When the pressure of the pipe network changes, the automatic valve spool automatically opens or closes the small valve port under the pressure to maintain the set flow value.
      Each opening of the manual valve group corresponds to a flow rate, and the relationship between the opening degree and the flow rate is calibrated by the test stand test, and is provided with an opening display and locking device.

 

For more details please check Botou Dechang Valve Co., Ltd.

Shang Lijie   Phone: 0317-8278504