Introducing and Explaining the Difference of Internal Diameter, Path and Nominal Path

The diameter of solenoid valve refers to the interface size of solenoid valve, which is usually G1/4, 1/4NPT, G1/2, 1/2NPT. This is the size connected with the cylinder, while the diameter refers to the actual flow capacity. Take 1/4 as an example, the diameter of solenoid valve is 2mm, 5mm, 6mm, 8mm, and the larger the flow capacity is, in addition, you put the air source of solenoid valve. When the interface is opened, it can be seen that the inner diameter is smaller than the outer diameter, and the diameter of solenoid valves with the same caliber is also different.
The nominal path is the theoretical value of the path