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Using a mechanic force valve，the traveling valve in the pump can be opened and closed quicker.The problem of gas lock can be prevented efficiently by this kind of pump，which is recommended to be used in viscous crude wells.
Pump bore （mm） | Length of plunger （m） | Length of barrel （m） | Range of stroke （m） | Pump constant | Size of connecting sucker rod | Size of connecting （in） |
44 | 2.235 | CYG19 | 2 7/8 TBG | |||
57 | 0.6～1.2 | 3.0～7.5 | 2.0～6.0 | 3.694 | CYG19 | 2 7/8 TBG |
70 | 5.518 | CYG22 | 3 TBG | |||
83 | 7.707 | CYG25 | 3 1/2 TBG |
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