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The internal blowout preventer is a large pressure drop check valve, the valve conical plug, reduce the cutting effect of mud on the valve seat, to ensure the correct closing state.

Bypass valve, also known as three-way valve, is a commonly used fluid control device, mainly used to regulate the flow and flow direction of fluid in pipelines.

A float valve joint is a connector commonly used in piping systems to effectively regulate the flow of fluid.

Stub boosting is a technique used in electronic devices to improve the performance of equipment by optimizing signal transmission paths and increasing data processing speed.