Pressure-controlling device, and pressure-using apparatus
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United States of America Patent
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Jul 11, 2023
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N/A
app pub date -
Nov 21, 2019
filing date -
Jun 1, 2017
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Abstract
A pressure-controlling device (10) includes a pump (21), a connection pipe (30), a first valve (41), and a second valve (42). The pump (21) has an inlet port (211) and an outlet port (212). The connection pipe (30) has a first end in communication with the outlet port (212), and a second end in communication with the inlet port (211) and that has a first space (31) that contains the first end, a second space (32) that contains the second end, and a third space (33) that is located between the first space (31) and the second space (32).
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