Regarding transmitters and three-valve assemblies
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Are the last two holes on the three-valve assembly the drain holes? Is Port 1 used for waste discharge or calibration? When in operation, are 1 and 2 connected to the H side of the transmitter as well?
Generally, there will be a schematic diagram of the pathways on a certain face
Polluting. During calibration, the center balance valve is opened, the positive and negative valves on both sides are closed, and the drain valve is opened to connect to the atmosphere.
The two holes in Figure 1 are mounting holes. Figure 2 is the same as what you understand
I have the same question as the original poster; when is it necessary to make corrections?
It should be available on the valve assembly, along with the operation diagram
It is used for emission testing or online calibration; there will be a piping diagram on the valve body
1 is used for waste gas discharge; the three-valve assembly consists of the high-pressure side H, the low-pressure side L, and the intermediate balance valve. When the transmitter is in use, it is necessary to open the high-pressure and low-pressure sides (which are connected to the transmitter diaphragm), to keep the waste gas discharge valve open, while the intermediate balance valve should be closed
What the original poster has is, strictly speaking, a five-valve assembly; ordinary three-valve assemblies do not have these two drain ports. There should be two more shut-off valves above these two holes; they are used only when it is necessary to have a tight seal.