Screw pump filter assembly
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The image shows a screw pump. Is the thing inside the circle the filter assembly? Which friend knows if the one in stainless steel color is a check valve? Could you provide the specific model and manufacturer? The black one must be the filter, right?
The black one is probably a breathing mask, an air filter or something similar. I’m not sure what type of material that stainless steel thing is
The black one is the air filter. This device is used for cooling exhaust gases; theoretically, there is a negative pressure inside, close to atmospheric pressure. It is usually connected to systems where the medium being pumped does not react with air, so a check valve is not necessary.
It should be a one-way valve. There have been instances of exhaust gas flowing back. It looks like a one-way valve from the KA series