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Float Valve Sub (Flapper / Plunger Type)
Float Valve Sub is installed in the drill string (commonly near the bit) to prevent reverse flow of mud/fluids back into the drill pipe. Unionlever OFS supplies Flapper Type “G”, Plunger Type “F”, and Plunger Type “FBP”, with OD and connections per your drilling program.
Category:
Well Control
The Float Valve Sub is an important drill string component used to prevent reverse flow of drilling mud or fluids back into the drill pipe during drilling operations. It is commonly installed near the bit connection and can also be applied at other required positions of the drill string.
UNIONLEVER OFS supplies Flapper and Plunger type Float Valve Subs, designed to automatically close under backflow conditions, helping to avoid mud influx, pipe blockage, and potential well control risks during drilling.
- Float Valve Sub assemblies for drill string applications
- Flapper type float valves (commonly referenced as Model “G”)
- Plunger type float valves (commonly referenced as Model “F”)
- Plunger type FBP configuration available upon request
- One-way valve design to prevent backflow into the drill pipe
- Automatic closing function activated by reverse flow
- Multiple internal structures available to suit drilling preferences
- Stable sealing performance for reliable circulation control
- Robust sub body suitable for downhole drilling environments
- Preventing reverse flow of drilling mud during drilling operations
- Reducing risk of mud entry and blockage inside the drill string
- Improving operational safety during circulation interruptions
- Used near the bit or at designated positions within the drill string
Float Valve Sub specifications vary based on valve type, size, sub OD, and top/bottom connection. Final configurations are supplied according to customer drilling program, drawings, or technical requirements.
- Incoming material verification
- Dimensional inspection of sub body and key interfaces
- Functional inspection of valve opening and closing behavior
- Final inspection and packing confirmation before shipment
- Float valve type (Flapper / Plunger / FBP if required)
- Float valve size
- Connection type and OD of sub
- Quantity and project timeline
Unionlever OFS supplies Float Valve Subs with controlled machining and stable internal valve performance to support safer drilling operations. We help customers align valve type, size, and connection details early to reduce rework and field mismatch.
With experience supporting international drilling and service projects, Unionlever OFS focuses on consistency, repeatability, and practical engineering coordination rather than one-off supply.
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sales@unionleverofs.com
ofs@unionlever.com
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Building upon more than a decade of field experience, Unionlever OFS offers a comprehensive portfolio covering downhole drilling tools, fishing tools, handling tools, well control equipment, cementing tools, and solid-control systems.
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Unionlever Oilfield Equipment Co., Limited
A Member of
Unionlever International Group Limited
(Established Since 2010)
"To be a globally trusted leader in oilfield equipment and integrated supply solutions."
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