Seeking advice on control valve size
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What does 1/2-3/8 mean? I measured the diameter of the pipe connected to the valve and it’s only 2.5 cm – how should I calculate this? It doesn’t seem right
The valve body has different sizes at its two ends.
I have seen this notation before: the connection for the valve body is 1/2", while the size of the valve core is 3/8". This is for reference only
The right to interpret the markings on the valve body lies with the manufacturer. The notation 1/2-3/8 may imply the following: 1. The inner diameter at the connection point and the diameter of the valve core ； 2. The bore range of the valve core (allows for the use of valves with various specifications). The dimensions measured on the outside refer to the connection sizes; although they are generally consistent with the nominal diameter, there are cases where they differ.
1/2 should refer to the size of the flanges on both sides, while 3/8 refers to the size of the valve core. For example, in our C80/65 control valve, the flanges are of DN80 size, and the valve core is 65 in size!