Selection of pressure reducing valve


According to the requirements of use, the type of press […]

According to the requirements of use, the type of pressure reducing valve and the accuracy of pressure regulation are selected, and then the diameter is selected according to the required maximum output flow rate. When determining the source pressure of the valve, it should be greater than the maximum output pressure of 0.1 MPa. The pressure reducing valve is generally installed after the water separator, before the oil mister or the constant value device, and be careful not to reverse the inlet and outlet; when the valve is not in use, the knob should be loosened to prevent the diaphragm from being constantly deformed by pressure. Its performance.

The balance valve belongs to the category of regulating valve. Its working principle is to change the flow resistance of the fluid flowing through the valve by changing the gap between the valve core and the valve seat (ie opening degree) to achieve the purpose of regulating the flow.

Kv is the valve coefficient of the balancing valve. It is defined as the flow rate (m3/h) flowing through the balancing valve when the differential pressure of the balancing valve is 1 bar (about 1 kgf/cm2). The valve coefficient when the balance valve is fully open is equivalent to the flow capacity of the ordinary valve. If the opening of the balancing valve does not change, the valve coefficient Kv does not change, that is to say the valve coefficient Kv is determined by the opening degree. By measuring the valve coefficients at different opening degrees, the balancing valve can be used as a throttling element for quantitatively adjusting the flow rate.

When the pipe network is balanced and debugged, the pressure measuring small valve of the balanced valve to be commissioned is connected with a special intelligent instrument by a hose, and the meter can display the flow value (and the pressure drop value) flowing through the valve, and communicate with the instrument man-machine. After inputting the required flow value at the balance valve to the meter, the meter calculates, analyzes, and obtains the opening value of the valve when the pipeline system reaches the hydraulic balance.