SF6 Gas Recovery & Refilling Equipment for GIS and High-Voltage Electrical Systems

YUNENG provides an all-in-one solution for SF6 gas management, integrating vacuuming, liquefaction, purification, and refilling into a single compact unit. Engineered for reliability, the system features a high-performance vacuum pump and regenerative dryer to ensure optimal gas purity.

Key Features:

  • All-in-One Functionality: Complete gas recovery, drying, filtration, and refilling.
  • Compact & Robust: Space-saving, durable structure designed for demanding field environments.
  • Precision Control: Intuitive instrumentation and precision valves for safe, stable operation.

15m³h SF6 Gas Recovery, Filtration, and Refilling System

Our SF6 Gas Recovery and Refilling Equipment Range

QTHS-1-10

10m³/h SF6 Gas Recovery and Filling Unit

QTHS-1-15

15m³/h SF6 Gas Recovery, Filtration, and Refilling System

QTHS-1-30

30m³/h SF6 Gas Recovery Service Cart

How SF6 Gas Recovery and Refilling Equipment Works

SF6 gas recovery and refilling equipment is designed to safely recover, purify, store, and refill sulfur hexafluoride (SF6 ) gas during the installation, maintenance, and servicing of gas-insulated electrical equipment. By operating in a closed-loop system, the equipment minimizes gas loss, prevents atmospheric emissions, and allows recovered SF6 to be reused after purification.

A complete recovery cycle typically includes gas extraction, impurity removal, vacuum evacuation, gas storage, and refilling. Each stage is carefully controlled to maintain gas quality and ensure reliable operation of high-voltage equipment.

Step 1 – Recover SF6 Gas
The system extracts SF6 gas from GIS, circuit breakers, or other gas-insulated equipment using a high-efficiency compressor. The recovered gas is transferred into the recovery unit without releasing it into the atmosphere.

Step 2 – Remove Moisture and Particles
Recovered gas passes through precision filters and drying units that remove dust, moisture, and suspended contaminants. Clean gas helps maintain excellent dielectric strength and reduces the risk of insulation failure.

Step 3 – Separate Oil and Impurities
Oil vapors and other contaminants generated during equipment operation are separated from the gas stream. This purification stage improves gas quality and extends the service life of electrical equipment.

Step 4 – Vacuum Evacuation
Before refilling, the equipment evacuates air and residual gases from the electrical apparatus. Creating a deep vacuum removes moisture and oxygen, ensuring the equipment is ready for high-purity SF6 filling.

Step 5 – Liquefy and Store SF6 Gas
The purified SF6 gas is compressed and liquefied for storage in the integrated storage tank or external cylinders. Proper storage minimizes gas loss and makes transportation and future reuse more convenient.

Step 6 – Refill the Equipment
After maintenance is completed, the purified SF6 gas is accurately refilled into the equipment at the required pressure. Controlled filling ensures stable insulation performance while reducing the need for purchasing new SF6 gas.

Why a Closed-Loop Recovery Process Matters

Compared with traditional manual gas handling methods, a closed-loop SF6 recovery system offers several important advantages:

  • Minimize SF6 gas emissions during maintenance.
  • Recover valuable gas for repeated use.
  • Improve gas purity before refilling.
  • Reduce operating costs by lowering new gas consumption.
  • Enhance maintenance efficiency and workplace safety.
  • Support environmentally responsible power equipment servicing.

Choose the Right SF6 Gas Recovery Unit for Your Application

YUNENG offers several SF6 gas recovery and refilling models to meet different maintenance requirements. Whether you need a compact unit for routine servicing or a high-capacity system for large substations, each model is designed to deliver reliable recovery, purification, storage, and refilling performance.

When selecting a model, consider your daily gas handling volume, equipment size, recovery speed, and mobility requirements.

ModelRecovery CapacityBest ForKey Advantages
QTHS-1-1010 m3/hRMUs and small GISCompact, portable, easy to operate
QTHS-1-1515 m3/hCircuit breakers and utility maintenanceBalanced capacity for daily field service
QTHS-1-3030 m3/hLarge GIS and substationsFaster recovery and higher productivity
Customized ModelsOn RequestSpecial projects and OEM applicationsTailored configuration for unique requirements

Typical Applications of SF6 Gas Recovery and Refilling Equipment

YUNENG SF6 gas recovery and refilling equipment is widely used wherever SF6-insulated electrical equipment is manufactured, installed, maintained, or repaired. Its flexible design supports both factory production and on-site field service, making it suitable for utilities, equipment manufacturers, and engineering contractors.

GIS installation

Gas-Insulated Switchgear (GIS)

Recover, purify, and refill SF6 gas during GIS installation, preventive maintenance, equipment upgrades, and repairs to maintain insulation reliability and reduce gas loss throughout the service process.

High-Voltage Circuit Breakers

High-Voltage Circuit Breakers

Safely handle SF6 gas during circuit breaker inspection, overhaul, leak repair, and recommissioning, ensuring consistent arc-quenching performance and extending equipment service life.

Power Utilities

Power Utilities

Enable utility maintenance teams to perform routine servicing, emergency repairs, and gas replacement on high-voltage assets while reducing downtime and maximizing SF6 gas reuse.

Gas-Insulated Substations

Gas-Insulated Substations

Support large-scale SF6 gas recovery, purification, storage, and refilling for transmission and distribution substations, improving maintenance efficiency while minimizing environmental emissions.

Electrical Equipment Manufacturing

Electrical Equipment Manufacturing

Provide vacuum evacuation, initial SF6 filling, gas recovery, and pressure testing during the production and factory acceptance testing of gas-insulated electrical equipment.

Maintenance projects

Electrical Maintenance Contractors

Offer a portable, integrated solution for on-site SF6 gas recovery and refilling during substation construction, equipment commissioning, retrofit projects, and field maintenance services.

Ready to Improve Your SF6 Gas Handling Process?

Whether you need a portable recovery unit for field maintenance or a fully integrated solution for large-scale operations, YUNENG can help you select the right equipment for your application.

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Why SF6 Gas Purity Is Important for Reliable Electrical Performance

The performance of gas-insulated electrical equipment depends heavily on the quality of the SF6 gas inside the system. During long-term operation, maintenance, or gas transfer, contaminants such as moisture, oil, air, and solid particles may enter the gas, reducing its insulation capability and affecting equipment reliability.

Recovering and purifying SF6 gas before refilling helps restore gas quality, improve equipment performance, and reduce the need for purchasing new gas.

  • Moisture: Moisture is one of the most critical contaminants in SF6 gas. Excessive water vapor lowers dielectric strength and increases the possibility of partial discharge or insulation failure. Effective drying is essential before gas reuse.
  • Oil Contamination: Oil vapor generated during compressor operation or equipment servicing can contaminate SF6 gas. Removing oil helps maintain insulation performance and protects sensitive electrical components.
  • Solid Particles: Dust, metal particles, and other impurities may accumulate during maintenance or equipment aging. Filtration removes these contaminants and helps maintain clean gas circulation.
  • Air and Non-Condensable Gases: Air entering the system reduces SF6 concentration and weakens insulation performance. Vacuum evacuation removes residual air before refilling, ensuring the equipment operates with high-purity SF6 gas.

Benefits of High-Purity SF6 Gas

Maintaining clean SF6 gas provides several important advantages:

  • Improve dielectric insulation performance
  • Increase equipment reliability
  • Reduce maintenance frequency
  • Extend service life of electrical assets
  • Support safe and stable system operation
  • Lower operating costs through gas reuse

Frequently Asked Questions about SF6 Gas Recovery and Refilling Equipment

Yes. After filtration, moisture removal, and purification, recovered SF6 gas can often be reused if it meets the required gas quality standards.

Vacuum evacuation removes air, moisture, and other non-condensable gases from the equipment, helping maintain insulation performance and ensuring high-purity SF6 filling.

Yes. The integrated filtration and drying system removes moisture, oil, dust, and other contaminants to improve gas quality before storage or reuse.

Yes. Portable models are specifically designed for field service, allowing maintenance teams to perform efficient SF6 gas recovery and refilling at substations and industrial facilities.

Yes. YUNENG can provide customized configurations, including recovery capacity, storage volume, control systems, and other options to meet specific project requirements.

An integrated system improves recovery efficiency, reduces gas emissions, enhances gas purity, lowers operating costs, and simplifies maintenance by combining multiple functions into one solution.

YUNENG offers comprehensive after-sales services, including equipment commissioning guidance, spare parts supply, technical consultation, troubleshooting assistance, and long-term maintenance support to ensure reliable operation throughout the equipment’s service life.

The integrated filtration and drying system removes moisture, oil, and solid particles from recovered SF6 gas. Under normal operating conditions, the purified gas can meet the quality requirements for reuse in high-voltage electrical equipment.