An underwater blowout preventer emergency lowering hydraulic control system

By designing an emergency lowering hydraulic control system for underwater blowout preventers, problems such as slow speed, oil overheating, and brake failure in the emergency lowering system of the underwater blowout preventer crane were solved, achieving reliable emergency lowering and safe operation.

CN120720299BActive Publication Date: 2026-06-05HONGHUA OFFSHORE OIL & GAS EQUIP JIANGSU
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HONGHUA OFFSHORE OIL & GAS EQUIP JIANGSU
Filing Date
2025-07-30
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

The existing underwater blowout preventer crane emergency lowering system has problems such as slow speed, the system being in a throttling and heating state for a long time, which leads to a sharp rise in oil temperature, brake circuit jamming leading to loss of control, and the cumbersome operation of the emergency oil tank and the main oil tank being separate, which poses safety hazards.

Method used

A hydraulic control system for emergency lowering of underwater blowout preventers was designed, including components such as a reversing valve, an emergency oil tank, a manual pump set, a brake, and a hydraulic control valve. Through specific pipeline connections and control logic, the system realizes the emergency lowering function, ensuring reliable lowering when the power source is lost and preventing brake failure, while providing a self-circulating loop for heat dissipation.

Benefits of technology

It improves the reliability and safety of emergency deployment of underwater blowout preventers, avoids oil temperature rise and brake failure, simplifies the operation process, and reduces safety risks.

✦ Generated by Eureka AI based on patent content.

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    Figure CN120720299B_ABST
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Abstract

The application discloses an underwater blowout preventer emergency lowering hydraulic control system which is connected with a hydraulic motor, a brake, an oil inlet pipe P and an oil return pipe R of a crane, and comprises a reversing valve, an emergency oil tank, a manual pump group, an emergency ball valve, a stop valve, a shuttle valve, a pressure reducing valve, a hydraulic control valve, a one-way throttling valve, a balance valve, a first throttling valve, a logic valve, a second throttling valve, a first one-way valve, a second one-way valve, a third one-way valve and a fourth one-way valve, so as to realize timely pressure relief, oil supplement and other operations, solve the problem that the underwater blowout preventer can be lowered in an emergency when an unexpected power source is lost, and eliminate safety hazards; and the underwater blowout preventer can overcome the shortcomings of the current crane emergency lowering hydraulic control system. In addition, the system has the advantages of good heat dissipation effect, reliable operation and the like.
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