| 1. | Positive displacement pumps are the most effective for low vacuums.
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| 2. | In this configuration the positive displacement pump serves two purposes.
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| 3. | Compared to centrifugal pumps, positive-displacement pumps have several advantages.
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| 4. | Thus, positive displacement pumps are " constant flow machines ".
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| 5. | This is the simplest of rotary positive displacement pumps.
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| 6. | Values of specific speed less than 500 are associated with positive displacement pumps.
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| 7. | A " peristaltic pump " is a type of positive displacement pump.
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| 8. | This is the principle behind positive displacement pumps, like the manual water pump for example.
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| 9. | A relief or safety valve on the discharge side of the positive displacement pump is therefore necessary.
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| 10. | A practical difference between dynamic and positive displacement pumps is how they operate under closed valve conditions.
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