The difference between vent and drain
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When it comes to filters, you often come across the two words vent hole and drain hole vent hole.: vent, exhaust hole, drain hole: Can you add any other explanations for the sewage outlet, relief outlet, and exhaust hole? Or give a definition to these two words from a technical point of view? If you have any objections to the above interpretation, you can also raise them
vent emphasizes that what is discharged is "gas" drain emphasizes that what is discharged is "liquid" vent hole drain hole drain condensation hole
vent refers to the exhaust port drain refers to the sewage outlet
So what is the difference between drain and discharge?
Drain generally refers to "draining, draining, draining", which is to drain the condensate condensed during the process (of course, in most cases, it refers to condensed water). discharge "discharge, discharge", mostly used in pumps and compressors, as opposed to suction. Of course, it also has other meanings in different situations.
On a compressor, discharge refers to the outlet of the compressor. Generally the amount is much larger. The amount of drain vent and exhaust liquid mixture is generally relatively small, and the pipe size is relatively small.
Vent is for venting, and the opening is at the top of the pipeline.； Drain refers to the discharge, and the opening is in the lower part of the pipeline.
Rewrite it: Vent opening is at the high point of the pipeline ； Drain refers to the discharge, and the opening is at the low point of the pipeline.
The layout of process pipelines is generally such that the exhaust vent is at a high point and the liquid is drained at a low point.
Vent refers to gas venting. At the high point, drain is the liquid diversion. At the low point, it is the outlet for compressor discharge, which corresponds to the suction inlet. Inlet and outlet can also be used.
Vent ventilation Drain empty discharge discharge suction suction
Here in Taiwan, it is roughly the same as what Brother Acha explained. VENT is opposite to DRAIN, and DISCHARGE is opposite to SUCTION in terms of application. Of course, VENT can also discharge liquid, and DRAIN can also discharge gas.