Control valve air path port analysis

1. Air supply port
The air supply port of the control valve refers to the port that receives the pressure of the air source, which is generally used to provide the power required for the movement of the valve core. According to the different air source, the air supply port can be divided into a variety of forms, such as pressure through port, external installation type through port and internal installation type pipe junction.
Two, exhaust port
The exhaust port is used to discharge the pressure of the working medium, which is generally used for the function of the control valve recovery spring to prevent the failure of the control valve. The design of the exhaust port requires that the pressure of the working medium can be quickly discharged, which is generally used in two ways: direct discharge or diversion discharge.
Three, control port
The control port is a part of the control signal operated manually or automatically to cut off or adjust the control signal in and out, so as to realize the control of the change of the spool position. The number and position of the control ports are determined according to the process requirements, structural design and control scheme of the system.
Four, signal port
The signal port is used to receive signals and conducted signals in the control system. It is generally an electrical signal, used in the control system to detect the motion of the control valve, and to send a control signal to the control valve. The number and location of signal ports are usually determined by the control scheme and control system.
5. Other ports
In addition to the above common four kinds of ports, the control valve has some other ports, such as manually operated hand wheel, screw port, and so on. These ports are used for different purposes, but equally need to meet the requirements of structural design, process requirements and control schemes.