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WZJA Double-Stage Vacuum Oil Purifier

The WZJA Double-Stage Vacuum Oil Purifier is designed to remove moisture, gases, and particulate contaminants from various insulating oils and transformer oils.
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WZJA Double-Stage Vacuum Oil Purifier
VIFLUTER FC Series vacuum heat pump evaporator for industrial wastewater treatment
WZJA Double-Stage Vacuum Oil Purifier
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Maintenance-free degassing and dehydration system: the oil is spread into a thin film, maximizing vacuum exposure area and flow path; combined with high vacuum, water and gases are fully vaporized for superior dehydration and degassing
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Indirect heating system based on patented technology introduced from Germany eliminates local overheating and uneven heating typical of conventional purifiers, preventing oil cracking, aging and elevated dielectric loss (tan δ)
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Fully automatic foam and level control system based on optical refraction detection, with a dedicated vacuum flow channel, completely prevents oil carry-over
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Filter elements use imported media with a three-dimensional graded-density flow path filtering from coarse to fine, avoiding surface blinding, increasing dirt-holding capacity and service life; one set can reliably filter 2,000 tons of new oil
VFD + PID control automatically balances inlet and outlet flow; stepless flow adjustment adapts to both high- and low-flow duties
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Product Features

Suitable for on-site maintenance filtration of transformers rated 500 kV and below, and deep purification of premium new oil, imported oil, instrument transformer oil and EHV transformer oil.
500 kV Transformer & EHV Oil Purification
Suitable for on-site maintenance filtration of transformers rated 500 kV and below, and deep purification of premium new oil, imported oil, instrument transformer oil and EHV transformer oil.
Suitable for maintenance and installation of power systems and substations in power plants, power stations, utilities, substation industry, metallurgy, petrochemical, machinery, transportation and railway sectors. Also used for vacuum oil filling, vacuum drying and hot-oil circulation of transformers. This series offers particular advantages at high altitude.
Wide Industry Applications & High-Altitude Adaptability
Suitable for maintenance and installation of power systems and substations in power plants, power stations, utilities, substation industry, metallurgy, petrochemical, machinery, transportation and railway sectors. Also used for vacuum oil filling, vacuum drying and hot-oil circulation of transformers. This series offers particular advantages at high altitude.
Combines oil extraction, oil filling, vacuum drying and hot-oil circulation filtration to meet on-site requirements.
Integrated Multi-Functional On-Site Operations
Combines oil extraction, oil filling, vacuum drying and hot-oil circulation filtration to meet on-site requirements.
Oil transfer and heating systems are strictly designed to prevent acetylene generation.
Anti-Acetylene Heating & Transfer Safety Design
Oil transfer and heating systems are strictly designed to prevent acetylene generation.

How It Works

The Double-Stage vacuum oil purifier works on the principle of the water saturation temperature curve and uses a double-Stage vacuum pump set to achieve high vacuum. Incorporating vacuum evaporation technology licensed from ABB & Micafluid (Switzerland), refined through years of optimization and iteration, it features a unique multi-stage degassing chamber and vacuum structure.


This design delivers optimal dehydration and degassing performance while fully preventing oil carryover from damaging the vacuum pumps.



Combined with high-flow, deep precision filtration, the unit reliably removes impurities from degraded oil, quickly restores oil performance, and ensures the treated oil meets service standards.


Technical Specifications
ItemsUnitWZJA-3KYWZJA-6KYWZJA-9KYWZJA-12KY
Flow RateL/h30006000900012000
Heating PowerkW30, multi-group60, multi-group90, multi-group120, multi-group
Total PowerkW4070105140
Lengthmm2150235023502600
Widthmm1260157016502300
Heightmm1980220025001900
Working oil Temperature℃35-65 (adjustable)
Working VacuumPa≤50
Ultimate VacuumPa≤5
Working PressureMPa≤0.5
Power Supply——Customized based on request (For example: USA 480V 60Hz, Mexico 440V/220V 60Hz, Saudi Arabia 380V 60Hz, Nigeria 415V 50Hz...)
Customer Case Studies

Customer Background: The customer, a subsidiary of China North Industries Group Corporation (NORINCO Group), is an integrated enterprise engaged in the R&D and production of road asphalt, transformer oil, specialty oils, and lubricant base oils. It specializes in high-quality transformer oil, providing stable production capacity and reliable quality for electrical insulating oils.


Customer Pain Points: Transformer oil becomes contaminated during filling and transportation, causing new oil to fail specifications for breakdown voltage, water content, and impurities.


Oil Purifier Specifications: Purification capacity: 500 L/min (adjustable via variable frequency drive); Working vacuum: ≤ 133 Pa; Ultimate vacuum: ≤ 5 Pa; Filtration rating: ≤ 1 µm; PLC-controlled automatic operation.


Results After Two Treatment Cycles: Particle cleanliness: NAS Class 6; Breakdown voltage: ≥ 70 kV; Water content: ≤ 5 ppm; Gas content: ≤ 0.3%.



Keep your oil clean. Keep your business running

Discover how removing particles, water, varnish and acids can reduce breakdowns, extend oil and equipment life, and lower maintenance costs.