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Low-torque highly-sealed ball screw plate valve
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Choke manifold inclined hole cylinder valve core and valve seat adjustable throttle valve
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Offshore christmas tree double-V-shaped high-pressure sealing device
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Deep-sea Christmas tree of offshore oil field
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Lifting four-way part for deep sea oil field wellhead device
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Ocean Christmas tree pipeline automatic welding device
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Novel high-pressure flat gate valve
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Oil well perforated plate type throttle valve
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High-pressure movable elbow for annular pipeline
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Oil production spherical air dome and air dome material thereof
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Oil production rotating column metal sealing valve
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Wellhead four-way casing for oil production deep well
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Wellhead bimetal seal assembly
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