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Drill String Float Valve - Flap

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Drill String Float Valve - Flap Type Float Valve


The drill string float valve (flap type) is a key internal blowout prevention device used in drilling operations to prevent well kick and blowout. It is usually installed at the bottom end of the drill string (near the drill bit). Its core function is to maintain fluid pressure balance inside the drill string during drilling. When the drilling fluid circulates normally, the float valve is open to allow fluid flow; when abnormal downhole pressure occurs (such as a well kick), the float valve flap quickly closes to prevent high-pressure fluid from flowing upward.

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