Air supply to the valve block or valve terminal with fieldbus interface

Depending on the valve size, the air supply requirements of the actuator, the length of the pipe from the pilot valve to the actuator and the cycle frequency, the valve block (eg valve on the valve terminal with fieldbus interface) is supplied by a pilot air supply from the pneumatic pipe network. . However, if the demand for compressed air is large, the pipeline is long, and several parallel valves need to work at the same time, then the supplied pilot source is not enough, and intermediate supply is required. In the field with the total
Flow direction of the medium in the solenoid valve
In most cases, the pilot valve is related to the flow direction of the medium (eg servo-assisted solenoid valve). If the flow direction changes, it will affect the valve's on/off function or reduce the switchable medium pressure.
The flow direction is generally described by an interface (1 = air supply port; 2 and 4 = output port; flow direction from 1 to 2 or from 1 to 4; 3 and 5 = exhaust port; flow direction from 2 to 3 or from 4 to 5) . In the loop function diagram, the flow direction is indicated by an arrow.
In special cases, the medium can also flow in both directions. This valve has two arrows in the circuit diagram of the circuit.
KV value and QNn value
According to the VDI/VDE 2173 standard, the KV value is an important parameter for selecting a valve. The KV value is the flow rate (m3/h) of water at 5-30 ° C and a pressure difference of 1 bar across the valve. The KV value of each solenoid valve and process control valve can be found in the data sheet.
In the valve terminal of the line interface, an optional basic pneumatic module and a pneumatic connector module are available for intermediate supply. The intermediate supply requires the configuration of additional supply and exhaust lines.