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- Energy storage hydraulic control system with reliable energy monitoring
- Energy storage high-flow hydraulic forming system
- High-precision digital servo synchronous actuation system
- Energy storage high-flow electro-hydraulic servo test system
- Energy storage, large flow compensation and balance hydraulic control system
- High-frequency fatigue testing system
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Energy storage hydraulic control system with reliable energy monitoring
- Energy storage high-flow power source start-up system
- Energy-saving electro-hydraulic control system
- Hydro-controlled system of electric furnace energy storage device power source
- Emergency control high-pressure accumulator power source for valves
- Governor energy storage power source electro-hydraulic control system
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Energy storage high-flow hydraulic forming system
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High-precision digital servo synchronous actuation system
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Energy storage high-flow electro-hydraulic servo test system
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Energy storage, large flow compensation and balance hydraulic control system
- High-frequency fatigue testing system
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Energy storage hydraulic control system with reliable energy monitoring
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The manufacturing and testing of the ultra‑high‑flow anti‑backflow valve have been successfully completed.
SCHWERLL has successfully completed the manufacturing of CNOOC’s ultra‑high‑flow anti‑recoil valves and the associated ultra‑high‑flow testing. The products have passed all performance‑related verification tests and flow‑rate assessments, and have obtained certification from CCS, the classification society.
Anti-recoil valve ( AVR Anti-Recoil Valve , also known in the industry as a check valve).
The anti‑rebound valve is a core control valve in the deepwater riser tensioning system. It is typically used in conjunction with an underwater hydraulic accumulator and is standard safety equipment on deepwater drilling rigs. Its primary function is to mitigate the substantial upward rebound (rebound) that occurs following an emergency riser release, thereby preventing high‑velocity impacts that could damage the drilling rig, the tensioning cylinders, and the associated pipelines.
English standard name: Anti-Recoil Valve (AVR).
Tensioning System Schematic for the Riser
Its core operating principle (two operating modes) includes:
1 ) Normal drilling mode (normal condition)
The valve is fully open, resulting in extremely low flow resistance.
Wave-induced vertical motion of the riser is accommodated by the free bidirectional flow of hydraulic fluid, while an accumulator and a tension cylinder together form a hydro‑pneumatic spring that maintains constant riser tension without compromising normal compensation movements.
2 ) Emergency Operating Condition (Anti-Recoil Protection Mode, Core Function)
Trigger scenario: Bottom of the riser LMRP With the subsea blowout preventer BOP Emergency release: As the weight of the riser is relieved, the accumulator’s substantial stored energy is instantly discharged, propelling the riser to rapidly accelerate upward in a rebound (recoil). This is governed by two distinct protection logics:
- Active electro‑hydraulic proportional control (emergency disengagement from the controlled operating condition)
The system receives a disengagement signal, and the controller dynamically adjusts the valve spool opening to throttle and limit the return flow from the hydraulic cylinder, thereby smoothly controlling the riser’s upward velocity, gradually dissipating the rebound kinetic energy, and achieving soft deceleration.
- Passive hydraulic self-locking protection (fail-safe mode, passive protection)
When the electronic control system fails, it relies on the valve’s own pressure differential. / Flow sensing: When an exceptionally large instantaneous reverse flow is detected and reaches the set threshold, the valve spool automatically closes rapidly, cutting off the oil circuit, locking the tension cylinder, and rigidly preventing severe rebound of the riser
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Address: Building 39B, Floor 1, No. 16, Huanke Zhong Road, Tongzhou Park, Zhongguancun Science and Technology Park, Tongzhou District, Beijing
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Schwerll Fluid Control (Beijing) Co., Ltd.
Email: schwerlltec@schwerll.com.cn
Address: Building 39B, Floor 1, No. 16, Huanke Zhong Road, Tongzhou Park, Zhongguancun Science and Technology Park, Tongzhou District, Beijing
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