Oil production wellhead gate valve under pressure replacement device and gate valve under pressure replacement method
A replacement method and gate valve technology, which are used in earth-moving drilling, wellbore/well components, etc., can solve the problems of time-consuming and labor-intensive, affecting the progress of oil production, increasing workload, etc., achieving simple device structure, improving maintenance and replacement efficiency, and manufacturing low cost effect
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[0027] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:
[0028] See figure 1 , is a structural schematic diagram of the device of the present invention, the oil production wellhead gate valve pressurized replacement device of the present invention includes a screw shaft 5, a slip assembly 2, a hydraulic cylinder 3, a sealing sleeve 4, an outer casing 6, and a screw nut 7 , shut-off valve 10 and hydraulic joint 11, wherein the slip assembly 2 and the hydraulic cylinder 3 are set on the optical axis section of the front part of the screw shaft 5, and the rear part of the hydraulic cylinder 3 is sealed by the sealing sleeve 4; The bar section is fitted with an outer casing 6 through a lead screw nut 7, and is fixed by a lock nut 9. The inner side of the outer casing 6 has a shape suitable for connecting with the clamp 15; the middle part of the screw shaft 5 is provided with a long hydraulic oil hole, thro...
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