SF6 Gas Recovery Machine
A Factory Price Manufacturer specializing in SF6 Gas Recovery Machine
Our company has evolved from a specialized technical team focused on power testing equipment R&D into a high-tech enterprise engaged in the R&D, production, sales, and service of high-voltage testing equipment. Our product portfolio encompasses: AC resonant test systems, high-voltage testers, Transformer winding resistance testers, Insulation resistance tester, Circuit breaker testers, relay protection testers, cable testers,Transformer oil BDV testers, DC battery testers, Primary Current Injection Tester, lightning impulse voltage generators, SF6 gas recovery machine and other power testing equipment. These solutions are widely applied across power engineering, transportation, power plant construction, railway infrastructure, petrochemical, metallurgical, and coal mining industries. The company holds multiple certifications including CE certification and ISO9001 Quality Management System certification. Its products are not only popular in mainland China but also exported to Indonesia, India, Pakistan, Vietnam, the Philippines, Saudi Arabia, the United Arab Emirates, Egypt, Turkey, Israel, Brazil, Germany, the United States, Australia, and other countries and regions. With exceptional product quality and robust technical support, the company has earned widespread trust and acclaim from its customers.
Primarily used in power supply bureaus and power stations; power construction companies; installation, maintenance and testing contractors; equipment manufacturers including transformer, switchgear, GIS and GIL manufacturers; as well as in the oil, chemical, metallurgical, coal mining, underground railway and rail transport sectors; university laboratories; and power research institutes.
Cumulative exports have reached Indonesia, India, Pakistan, Vietnam, the Philippines, Saudi Arabia, the United Arab Emirates, Egypt, Turkey, Israel, Brazil, Germany, the United States, Australia, and other countries and regions. With over 150 distributors worldwide and more than 10 overseas service offices, we have successfully opened up global markets.
Our products have passed inspections by national and provincial energy authorities and have obtained CE certification. Furthermore, the company has been certified to the ISO 9001:2015 Quality Management System, the ISO 14001:2018 Occupational Health and Safety Management System, and SGS certification. Awarded the title of ‘National High-Tech Enterprise’, holding over 20 patents, including a utility model patent for variable-frequency series resonance testing equipment.
We pledge to treat every client with integrity and equality, regardless of contract size or whether they are domestic or international, new or existing customers, providing professional consultation and advice. Goldhome provides professional installation, commissioning and training for users' workers, ensures that users can get familiar with operation methods and put machines into use as soon as possible.
What is SF6 Gas Recovery Machine
The SF₆ gas recovery unit is a specialised piece of equipment designed for the treatment of SF₆ gas in electrical equipment (such as GIS, circuit breakers, ring main units and current transformers), enabling the integrated recovery, purification, drying, storage and recharging of SF₆ gas. Its primary function is to recover, purify and store the SF₆ gas contained within electrical equipment during its manufacture, installation, operation and maintenance, and to recharge the equipment with the gas when required.
Key Functions
1. SF₆ Gas Recovery
Extracts SF₆ gas from the equipment and stores it in a high-pressure liquefied state.
2. Vacuum Evacuation
Evacuates and pressurises the gas compartment to ensure insulation performance.
3. Purification and Drying
Removes moisture, oil, dust and decomposition products.
4. SF₆ Recharging
Recharges the equipment with qualified SF₆ gas.
5. Storage
Stores SF₆ in liquid or gaseous form without leakage or contamination.
Operating Principle
SF₆ Gas Recovery machine: Operating Principle
Low-temperature refrigeration + high-pressure compression → converts gaseous SF₆ into liquid SF₆ → storage → regasification and recharging
1. Evacuation
First, use a vacuum pump to create a high vacuum inside the equipment’s gas chamber and piping, removing air and moisture.
2. SF6 Gas Recovery
Extract gaseous SF6 from equipment such as GIS or circuit breakers.
Compress the gas using a compressor.
Simultaneously cool the gas via the refrigeration system.
Convert the SF6 from a gaseous to a liquid state and store it in a storage tank.
3. Purification and Drying
Pass the gas through a filter and a desiccant dryer to remove moisture, oil mist and decomposition products.
4. Recharging (Gas Filling)
When gas filling is required, the liquid SF6 is heated to vaporise it, after which it is recharged into the electrical equipment.
5. Vacuum Pumping + Pressure Holding
A vacuum is re-established prior to recharging to ensure the gas compartment remains clean and dry.
Operation Step
Step 1: Evacuation
Prior to gas recovery or charging, it is usually necessary to evacuate the main unit, connecting piping or electrical equipment to remove air and moisture.
Scope of operation: Evacuation of the unit itself (upon first use or after the unit has been exposed to atmospheric air).
1.1Valve sequence:
Open: Vacuum pump, valves V1, V2, V3, V5.
Observation: Open valve V8 to monitor the vacuum level; once the required level is reached (e.g. below 133 Pa or 30 Pa), close V8.
Close: Close all open valves and the vacuum pump in the reverse order.
Scope: Evacuating the electrical equipment.
1.2Valve sequence:
After completing the evacuation of the unit itself, close the relevant valves.
Open: Vacuum pump, valves V1 and V6 (valves connecting the equipment).
Observation: Open valve V8 to monitor the equipment’s vacuum level; close V8 once the required level is reached.
Shutdown: Valves V1, vacuum pump, V6.
Step 2: Gas Recovery
Recover the SF6 gas from the electrical equipment, purify it, and store it in liquid form in the unit’s storage tank.
Pre-cooling: If necessary, start the refrigeration system 15–30 minutes before recovery begins and monitor the thermometer until the temperature drops to approximately 10°C.
2.1Valve Sequence:
Open: Valves on the equipment side, valves V6 and V5, utilising the pressure differential to allow the gas to flow into the storage tank initially.
Once pressure has equalised, open: valve V3 and the SF6 compressor, then slowly open valve V2 to commence compressor recovery.
Monitoring: Closely monitor the compressor discharge pressure gauge (M2) to ensure it does not exceed 2.0 MPa (this can be controlled by adjusting the opening of valve V2). Simultaneously monitor the storage tank liquid level; it must not exceed two-thirds of the sight glass.
Completion: When the pressure inside the equipment drops to the final recovery pressure (e.g. 0.05 MPa or lower), close: V6, V2, the SF6 compressor, V3, and finally shut down the refrigeration system.
Step 3: Gas Charging
Recharge the purified SF6 gas from the storage tank back into the electrical equipment.
Prerequisite: Ensure that the equipment has been fully evacuated.
3.1 Valve sequence (pressure differential method, applicable when the tank pressure exceeds the required equipment pressure):
Open: The valve on the equipment side and valve V4 (charging valve); use the pressure differential to charge directly.
Monitor: Observe the pressure gauge on the equipment; once the specified operating pressure is reached, close: V4 and the valve on the equipment side.
3.2 Valve sequence (compressor method, applicable when the tank pressure is insufficient):
Open: Valve V7 (external gas source or storage tank), V2, V3, SF6 compressor, and V4.
Monitor: Continue until the required pressure is reached.
Finish: Before shutdown, recover the gas in the piping back into the storage tank via the compressor until the suction inlet pressure (M1) reaches zero gauge pressure, then close all valves.
Specific Application
Power Grids / Substations
- GIS (Gas Insulated Switchgear)
- SF₆ high-voltage circuit breakers, load break switches
- Current transformers, bushings, ring main units
- Applications: Installation, maintenance, fault clearance, preventive testing.
High-Voltage Electrical Equipment Manufacturers
- Switchgear manufacturers, GIS manufacturers, transformer manufacturers, ring main unit manufacturers
- Applications: Vacuum evacuation, gas filling, factory acceptance testing and gas recycling during the production process.
Power Construction & Installation Companies
- New substations, distribution rooms and power grid projects
- Applications: Vacuum evacuation, gas filling, leak detection and handover testing following equipment installation.
Oil, Chemical, Metallurgical and Coal Mining Industries
- Internal high-voltage distribution rooms and high-voltage switchyards at plants and mines
- Applications: Equipment maintenance, SF6 gas recovery and treatment, and safe maintenance operations.
Rail Transport & Infrastructure
- Metro and high-speed rail traction power supply systems
- Applications: Maintenance of GIS and high-voltage switchgear.
Third-Party Testing / Installation, Maintenance and Testing Contractors
- Electrical testing, maintenance, and qualification upgrades
- Applications: On-site SF₆ gas handling services.
Searching Name
SF6 Gas Recovery and Purification Device
SF6 Recovery Device
SF6 Recovery Unit
SF6 Vacuuming Device
SF6 Gas Recovery System
SF6 Gas Recovery, Filling and Purification Device
SF6 Recovery & Refilling Unit
SF6 Gas Recovery & Charging
SF6 Gas Recycling Equipment
SF6 Gas Recovery Device
SF6 Gas Recovery, Purification, Filling and Discharging Device
FAQ
Q: 1. What is an SF₆ gas recovery unit?
A: An SF₆ gas recovery unit is specialised equipment used for evacuating, recovering, purifying, drying, recharging and storing SF₆ gas in SF₆ electrical equipment such as GIS, circuit breakers and ring main units, thereby enabling the recycling of the gas and promoting environmental protection and energy efficiency.
Q: 2. What are the main functions of an SF₆ recovery unit?
A: Evacuation
SF₆ gas recovery (liquefied storage)
Gas purification, drying and filtration
SF₆ gas recharging
Vacuum pressure maintenance and pressure monitoring
Q: 3. Which equipment requires an SF₆ recovery unit?
A: GIS (Gas-Insulated Switchgear)
SF₆ high-voltage circuit breakers
SF₆ load switches and ring main units
SF₆ current transformers and bushings
Q: 4. Can the recovered SF₆ gas be reused directly?
A: Yes. The unit is equipped with a built-in drying and filtration system that removes moisture, dust and decomposition products. After treatment, the gas purity meets power industry standards and can be directly recharged for use.
Q: 5. What causes slow recovery speed?
A: Common causes:
Excessively long piping, leaking joints
Clogged filters
Refrigeration system or compressor not functioning properly
Leaks in the equipment’s gas chamber
Solution: Leak detection, filter cartridge replacement, inspection of compressor and refrigeration system.
Q: 6. Why is it necessary to evacuate the system before recovery?
A: To remove air and moisture, preventing contamination of the SF6
To prevent air from entering the compressor, which could pose a hazard
To ensure gas purity and the insulation performance of the equipment
Q: 7. Does this unit require an external cylinder?
A: Generally, an external SF6 recovery cylinder is required for storing liquid SF6.
Some integrated units come with a built-in gas tank, eliminating the need for an external cylinder.
Q: 8. Can the SF6 recovery unit achieve zero residue?
A: It can achieve extremely low residue levels (generally ≤0.05 MPa).
Through a dual-method approach combining a compressor and refrigeration liquefaction, recovery is more thorough.
Q: 9. How often does maintenance need to be carried out?
A: Desiccant: Replace every 1–2 years
Filters: Inspect and replace every 3–12 months depending on usage frequency
Compressor, vacuum pump: Regular oil changes and leak checks
Q: 10. What are the advantages of the Guodian Huamei SF6 recovery unit?
A: Refrigeration and liquefaction ensure fast recovery and low residual levels
Two-stage compression for high efficiency
Integrated purification and drying, allowing the gas to be reused directly
Simple operation, suitable for both on-site and workshop use
Meets the requirements for installation, maintenance and testing qualifications
As one of the most professional sf6 gas recovery machine manufacturers in China, we're featured by quality products and good price. Welcome to buy sf6 gas recovery machine in stock here and get pricelist from our factory. Contact us for customized service.
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