Novel variable-diameter gate rubber core
A variable and ram technology, which is applied to wellbore/well components, earthwork drilling, sealing/isolation, etc., can solve the problems of complex operation and high drilling cost, and achieve improved sealing effect, improved sealing aid effect, and reduced The effect of maintenance costs
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[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but the embodiments described in the present invention are some of the embodiments of the present invention, not all of them .
[0039] It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.
[0040] In describing the present invention, it should be noted that the terms "centre", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. indicate The orientation or positional relationship of the invention is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that is usually p...
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