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With working of the barrel the well liquid is always in dynamic condition so as to be suitable with high sand-laden well. When pump stopping working the top cage cuts down automatically to prevent sand in well liquid from aggrading in the barrel, for which it is usually used in discontinuous well and gas-oil content well but not in the low liquid level well and deep well.
Rod Pump With Dynamic Working Barrel
Yumen Oilfield Import & Export Corp.
Pumps, &, vacuum, equipment
