Self aligning stuffing box for pumpjack
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Article
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1997
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Elsevier Science
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English
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## Patents from the axis of the engine. The seal tends to become glued to the bottom of its cavity. This increases the quality of sealing contact. A metal particularly well-adapt ed to the seal requirements is a nickel-chromium alloy, namely NC19FeNb. So as to avoid marking nearby elements adjace