Adjusting caliber calculated of the valve

Adjusting the selection of the valve diameter Firstly, according to the production process requires the flow rate Q and adjust the valve before the pressure difference ΔP is calculated as the nominal flow capacity control valve C (Kv). Then select the appropriate caliber regulating valve product line. The so-called nominal flow capacity C is, when the control valve fully open valve before and after the pressure of 0.1MPa, flow weight of 1g/cm3 the hour flow through the flow control valve in m3 / h or t / h meter. The flow capacity of the formula Referring to Figure 1. For high-viscosity liquids should be based on the Reynolds number correction viscosity coefficient, due to small and medium-sized power plants rarely encountered, is omitted in this article.
A high-tech zones thermal power plant high pressure heater drain valve, for example, the process diameter D108 × 4, the medium is water, the maximum flow rate of 22t / h, the medium temperature of 200 ° C, working pressure to 1.5 MPa, the valve before the pressure is The valve after the pressure is 1.5MPa, 1.0MPa.
Water liquid, its nominal flow capacity as C = 9.84; should choose DN32 valve seat.
standard air cylinder
Epilogue
In small and medium-sized power plant design, the most common is generally liquid and superheated steam control valve selection and sizing. Mainly used in deaerator pressure and water level control valve, high pressure heater drain valve and condenser supply water regulating valve of choice. When the leakage requirements is very small, should be used in single-seat control valve; greater or less demanding rigor adjust the differential pressure across the valve, the choice of the valve seat. Usually calculated regulating valve diameter than the pipe through a small diameter, and thus need to adjust the valves at both ends coupled with size head.

direct acting solenoid valves