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Seems like we have same type of work. I work with flammable liquids, and we have a pre-made vacuum tester. Will post pictures a little later.
I like this one! I similar valve to test vacuum leakage on gas pump systems. But on our setup, the venturi has a one-way valve where the air comes out. I will post a picture later. Good work!
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DIY high resolution 3D DLP printer (3D SLA printer)
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