| http://www.w3.org/ns/prov#value | - Thus the fluid and any gas contained therein are not merely compressed during the downstroke of fluid pump 71, but are rather compressed and expelled upwardly through the automatically and mechanically open thirdvalve 77.If the fluid to be pumped contains any sand, or other abrasive particles or impurities, such sand should be expelled from fluid pump 71.
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