Regulating valve type and selection
Jun 25, 2019| Regulating valve type and selection
The regulating valve, also known as the control valve, changes the fluid flow by means of a power operation by accepting a control signal output from the regulating control unit. The regulating valve is generally composed of an actuator and a valve. If the power used by the actuator is matched, the regulating valve can be divided into three types: pneumatic regulating valve, electric regulating valve and hydraulic regulating valve, that is, pneumatic regulating valve with compressed air as power source and electric power source. Regulating valve, electrohydraulic regulating valve powered by liquid medium (such as oil), in addition to its function and characteristics, hydraulic control valve, solenoid valve, electronic, intelligent, fieldbus type regulating valve Wait.
Valve body type selection of regulating valve
There are many types of valve bodies for regulating valves. Commonly used valve bodies are straight-through single-seat, straight-through two-seat, angular, diaphragm, small flow, three-way, eccentric rotation, butterfly, sleeve, and spherical. In the specific choice, you can make the following considerations:
(1) Spool shape structure
Mainly based on factors such as selected flow characteristics and imbalance forces.
(2) Wear resistance
When the fluid medium is a suspension containing a high concentration of abrasive particles, the internal material of the valve is tough.
(3) Corrosion resistance
Due to the corrosive nature of the media, try to choose a simple valve.
(4) Temperature and pressure of the medium
When the temperature and pressure of the medium are high and the change is large, the valve and the material of the valve seat should be selected to be small in temperature and pressure.
(5) Prevent flashing and cavitation
Flashing and cavitation are only produced in liquid media. In the actual production process, flashing and cavitation will form vibration and noise, shortening the service life of the valve, so the valve should be prevented from flashing and cavitation when selecting the valve.