Electric control valve selection and sizing

Electric control valve is often used in small and medium-sized power plants as a means of regulating the electric control valve choose whether or not appropriate, a direct impact on the quality of the automatic control system of regulating. This article presents a selection and method of calculation of the electric control valve are introduced.
The fluid flow rate adjusting mechanism is a tool to change the flow rate of the fluid according to regulate divided into two categories:
Transformer regulation. By changing the pressure up and regulate the traffic, such as variable speed pumps, variable speed fan.
two position three way valve
Throttle adjustment. To regulate the flow by changing the flow resistance of the medium, such as regulating valves, baffles, etc..
Transformer adjusting mechanism is more complex, less variety of equipment, so using less range. In the feedwater control, air volume control system, due to the reduced power loss, it is possible to obtain a greater economic effect, and thus often used transformer adjustment mechanism; difficult to work in high flow, high pressure Occasion throttle adjustment mechanism, often transformer-adjusting mechanism.
In addition, most of the adjustment system uses the the throttle adjusting mechanism, regulating valve. Both pneumatic and electric control valve, in small and medium-sized power plants, due to a limited number of control valve, pneumatic, should be equipped with a set of instrument air compressor station, high investment, which is usually the electric control valve. Following the selection and calculation of the electric control valve do a brief introduction.

pneumatic auto drain