The feature of this pump is that the opening of one valve depends on the mechanical force. Because the valve is not be opened by pressure sink it is a good method to deal with vapor lock and gas lock and further to improve the volume of pump. In addition because the cone valve is mounted in reverse order the pump can be used in viscous oil wells in which sand content is more. The pump can also be used in the wells of high gas bearing. Features: 1) Nominal bore size: 38 - 83mm 2) Plunger length: 900 - 1,200mm 3) Tubing size: 73 - 101.6mm 4) Length of stroke: 1,500 - 6,000mm Packing: wooden cases
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