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Roatry vane pump |
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| Non-return valve |
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| － Non-return valve to protect system against ingress of air opposite pressure, should pump stop for any reason. With pipelines exceeding 5 meters length, the installation of non-return valves are recommended. When the vacuum pump is switched off while under vacuum, gas may flow back into inlet pipe. Install non-return valve or shut-off valve can to avoid this. |
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