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Reliable Drilling Tools.Global Trust.

Providing high-performance downhole tools, valves, and oilfield accessories with proven qualityand global recognition.

Well Control

Well control valves are one of Unionlever’s core product strengths. Our portfolio includes DSSV, Kelly valves, FOSV (TIW type), inside BOP valves, top drive IBOPs and float valves, manufactured with sour-service materials and working pressures up to 10,000–15,000 PSI. The designs follow widely used configurations and comply with API/NACE requirements.
TOP DRIVE IBOP (Upper/Lower)

TOP DRIVE IBOP (Upper/Lower)

The TOP DRIVE IBOP is a vital blowout preventer used in top drive systems to ensure well control during high-pressure drilling operations. It meets API 6A standards and is designed for rapid sealing and long-term durability.

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Full Opening Safety Valve (FOSV)

Full Opening Safety Valve (FOSV)

API 7-1 compliant Full Opening Safety Valve (FOSV / TIW) for reliable drill string well control. Designed for tripping, workover, and emergency operations with full-bore flow and premium thread compatibility.

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Kelly Valve (TIW / Kelly Safety Valve)

Kelly Valve (TIW / Kelly Safety Valve)

Kelly Valve (also known as TIW or Kelly Safety Valve) is a critical well control device designed to be installed in the drill string to prevent uncontrolled flow during drilling, tripping, or emergency situations. It provides a reliable shut-in capability during drilling and well servicing operations.

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Upper Inside Blowout Preventer (Upper IBOP)

Upper Inside Blowout Preventer (Upper IBOP)

Upper Inside Blowout Preventer (Upper IBOP) is an API 7-1 well control valve installed at the upper position of the drill string, typically integrated with top drive systems, providing fast internal pressure isolation during drilling operations.

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Lower Inside Blowout Preventer (Lower IBOP)

Lower Inside Blowout Preventer (Lower IBOP)

Lower Inside Blowout Preventer (Lower IBOP) is an API 7-1 well control valve installed at the lower position of the drill string, designed to withstand high pressure and torque while proving reliable internal shut-off during critical well control situations.

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One-Piece Drill Pipe Safety Valve (DSSV)

One-Piece Drill Pipe Safety Valve (DSSV)

A one-piece Drill Pipe Safety Valve (DSSV) is a full-bore well control valve designed for rapid installation in the drill string to prevent backflow during drilling and well control operations.

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Two-Piece Drill Pipe Safety Valve (DSSV)

Two-Piece Drill Pipe Safety Valve (DSSV)

A two-piece Drill Pipe Safety Valve (DSSV) features a separable valve body and connection section, offering flexible maintenance and cost-effective lifecycle support for drill string well control applications.

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Tubing Safety Valve (TSV)

Tubing Safety Valve (TSV)

Tubing Safety Valve (TSV) provides well control by preventing backflow through tubing during drilling, completion, and workover operations. It is ideal for deep well applications.

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Drop-In Retrievable Check Valve

Drop-In Retrievable Check Valve

Drop-In Retrievable Check Valve is designed for well control applications, installed directly into the drill string to prevent backflow during drilling, tripping, or emergency well control situations.

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Float Valve Sub (Flapper / Plunger Type)

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.

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Drop-In Check Valve

Drop-In Check Valve

Drop-In Check valves prevent return flow during a kick and are suitable for most drilling situations in which return flow through the drill string is a risk and normal operation requires the benefits of a full-bore sub.

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Inside Blowout Preventer (IBOP)

Inside Blowout Preventer (IBOP)

Inside Blowout Preventer (IBOP) is an API 7-1 well control valve installed in the drill string to stop backflow and isolate pressure during tripping, workover, or emergency well control operations. UNIONLEVER OFS supplies TIW-type equivalent IBOPs with OEM / interchangeable design, optional H2S service trim, and repair / redress kits for fast on-site maintenance.

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Product Consultation & Matching

Get expert guidance to identify the most suitable tools based on your well conditions, application needs, and project requirements.

Technical Advice & Application Support

Receive technical recommendations, application insights, and configuration advice to ensure safe and efficient operations.

Tailored Engineering or Custom Requests

Share your drawings, photos, or special requirements-we help source or manufacture tools tailored to your exact specifications.

Flexible supply & Global Delivery

Benefit from flexible sourcing options and reliable worldwide delivery supported by our strong supply chain network.

Contact Our Team

Unionlever Oilfield Equipment Co., Ltd.

                              A Member  of
      Unionlever International Group Ltd. 
                        (Established Since 2008)

"To be a globally trusted leader in oilfield equipment and integrated supply solutions."

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