Pressure oil purifiers and vacuum oil purifiers are two mainstream pieces of equipment for industrial oil purification. Their core differences lie in their working principles, applicable scenarios, and purification effects. The following is a detailed comparison:

1. Core Principle Comparison

| Comparison Items |                                                      Pressure Oil Purifier                                                                   |      Vacuum Oil Purifier     |

|---------------------|---------------------------------------------------------------------------------------------------------|-----------------------------|

| Working Principle | Forced removal of impurities through pressure filtration (high-pressure pump + filter element) | Evaporation of water and gases through vacuum and heating      |

| Key Technologies  | Mechanical filtration (filter element, filter plate) | Vacuum distillation, condensation separation |

| Driving Force        | Pressure Differential (0.3-0.6 MPa)                                                                                                  | Vacuum Degree (-0.095--0.1 MPa) |

2. Purification Capacity Differences

|         Purification Target        |                     Pressure Oil Purifier                      |                      Vacuum Oil Purifier                      |

|--------------------------------|---------------------------------------------------|---------------------------------------------------|

| Solid Impurities                    | ✅ High Efficiency (1-5 μm precision)              | ⚠️ Average (requires pre-filtration)                 |

| Free Water                            | ✅ Removable (coalescing and separation)     | ✅✅ Deep Dehydration (water evaporation) |

| Dissolved Water                   | ❌ Limited effect                                               | ✅ Complete removal (heating + vacuum)     |

| Gas/Bubbles                         | ❌ Unable to remove                                        | ✅ Efficient degassing (vacuum extraction)    |

| Oxidants/Acidic Substances | ⚠️ Partial adsorption (activated carbon filter) | ✅ Degradable (high temperature vacuum)    |

3. Applicable Applications

|      Applications     |                         Pressure Oil Purifier                                  |                                Vacuum Oil Purifier                                     |

|---------------------|---------------------------------------------------------------|--------------------------------------------------------------------|

| Transformer Oil     | Suitable for used oil with high impurities                         | Suitable for regenerating insulating oil containing water/gas |

| Hydraulic Oil         | ✅ Protects precision hydraulic components                   | ⚠️ Used in conjunction with dehydration only                         |

| Turbine Oil            | Filters metal shavings                                                        | ✅ First choice (requires deep dehydration and degassing)     |

| Lubricating Oil      | ✅ Extended Service Life                                                   | ❌ Overheating May Affect Additives                                       |

| Online Operation | ✅ Can Be Connected to a Continuous Filtration System | ❌ Requires Downtime for Treatment                                       |

4. Equipment Features

|           Features            |       Pressure Oil Purifier       |                             Vacuum Oil Purifier                               |

|-------------------------|------------------------------- |--------------------------------------------------------------|

| Energy Consumption  | Low (Pump Only)                 | High (Heating + Vacuum Pump)                                      |

| Maintenance Cost      | Regular Filter Replacement  | Requires Cleaning of Condenser and Vacuum Pump Oil |

| Size                             | Compact, Easy to Move       | Large (Includes Heating Tank and Condensing Unit)       |

| Processing Speed       | Fast (Direct Filtration)          | Slow (Requires Heating and Evaporation)                         |

5. How to Choose? - Choose a pressure oil purifier:

➤ Oil with high impurities (such as metal shavings and dust)

➤ Requires rapid filtration or online operation

➤ Limited budget, prioritizes mechanical protection

- Choose a vacuum oil purifier:

➤ Oil with high water content or severe emulsification

➤ Requires deep degassing (such as transformer oil and turbine oil)

➤ High oil regeneration requirements (such as excessive acidity)

Summary

- Pressure oil purifier: Strength in physical filtration, suitable for applications with predominantly solid contaminants.

- Vacuum oil purifier: Strength in chemical purification, suitable for oils with water, gas, and oxidation issues.

- Hybrid oil purifier: High-end models combine both (e.g., vacuum dehydration followed by pressure filtration), but are more expensive.

Choose based on the type of oil contamination (solids/liquids/gases) and operating requirements (online/offline processing).