The V-3/300 high pressure air compressor is a reciprocating piston unit designed for industrial processes requiring compressed air at 30 MPa(G). It takes atmospheric air at ambient temperature and delivers a flow rate of 180 m³/h (3 m³/min) through three compression stages, driven by a 75 kW electric motor. The machine is primarily deployed for pipeline pressure testing, vessel hydro-pneumatic testing, high-pressure cylinder filling, and aerospace ground support operations. Each unit is engineered to order, with adjustable flow rates, discharge pressures, cooling configurations, and installation formats to match specific project conditions.
The compressor operates on a V-type cylinder arrangement with water cooling and oil-lubricated crankcase. A double middle-body structure separates the crankcase from the compression cylinders to contain lubricating oil and prevent carryover into the gas stream. Cylinders and cylinder heads are manufactured from cast iron or forged steel, selected according to the pressure rating of each stage. The complete assembly is mounted on a skid frame with integrated interstage coolers, a final cooler, separators, and a control panel, reducing on-site installation work to piping and power connections.
The V-3/300 uses a 2-row, 3-stage compression layout. Atmospheric air enters the first-stage cylinder, is compressed to an intermediate pressure, then passes through an interstage cooler and separator before entering the second stage. A third stage brings the gas to the final discharge pressure of 30 MPa(G). Each stage is fitted with axial-type suction and discharge valves designed for high-frequency operation and low pressure drop. The piston rod is protected by a threaded sleeve (patent ZL 2017 2 1907021.7), and piston rings are supported by a dedicated device (patent ZL 2018 2 0294776.2) to extend service intervals.
Cooling is provided by a closed-circuit water system with shell-and-tube interstage and aftercoolers. Cooling water inlet temperature is typically ≤32°C, with a recommended flow rate specified in the project datasheet. The crankcase uses forced-feed lubrication with a gear-type oil pump and a full-flow filter. Cylinder lubrication, where specified, is delivered by a multi-point lubricator. The double middle-body includes a vented chamber to drain any oil migration, supporting clean gas delivery.
The compressor is equipped with safety valves on each interstage separator and the final discharge vessel, each set to the maximum allowable working pressure of the corresponding stage. A pressure switch triggers an automatic shutdown if discharge pressure exceeds the setpoint. Additional protection includes low cooling-water flow, high discharge temperature, low oil pressure, and overload protection via the motor control center. The control panel provides local indication of stage pressures, temperatures, and operating status.
Core parameters of the V-3/300 model:
Parameter | Value |
|---|---|
Model | V-3/300 |
Medium | Air |
Flow rate | 180 m³/h (3 m³/min) |
Inlet pressure | Atmospheric |
Inlet temperature | Normal temperature |
Discharge pressure | 30 MPa(G) |
Compression stages | 3 stages, 2-row |
Main motor power | 75 kW |
Cooling method | Water cooling |
Lubrication | Oil-lubricated crankcase, double middle-body isolation |
Structure | V-type reciprocating, skid-mounted |
 |  |
Related high pressure air compressor models (reference):
No. | Model | Medium | Flow rate (Nm3/h) | Inlet pressure (MPa.G) | Exhaust pressure (MPa.G) | Speed (r/min) | Motor power (kW) | Cooling method | Overall dimensions (mm) | Weights (kg) |
|---|---|---|---|---|---|---|---|---|---|---|
1 | SF-10/250 | Air | 600 | Atmospheric | 25.0 | 1330 | 258.5 (Diesel) | Air-cooled | 7000×2200×2200 | 8500 |
2 | SF-10/150 | Air | 600 | Atmospheric | 15.0 | 1330 | 258.5 (Diesel) | Air-cooled | 7000×2200×2200 | 8500 |
3 | SF-7.5/250 | Air | 450 | Atmospheric | 25.0 | 980 | 160 (Diesel) | Air-cooled | 6500×2200×2200 | 7000 |
4 | SF-7.5/150 | Air | 450 | Atmospheric | 15.0 | 980 | 132 (Diesel) | Air-cooled | 6500×2200×2200 | 7000 |
5 | SF-8.5/250 | Air | 510 | Atmospheric | 15.0 | 980 | 200 (Diesel) | Air-cooled | 7000×2200×2200 | 8500 |
6 | W-10/60 | Air | 600 | Atmospheric | 6.0 | 1330 | 132 (Diesel) | Air-cooled | 6000×2200×2200 | 7000 |
The V-3/300 serves industrial clients in pressure testing service companies, oil and gas pipeline contractors, and manufacturing plants requiring high-pressure air for leak testing or process charging. Typical uses include pneumatic pressure testing of pipelines and pressure vessels prior to hydrostatic testing, high-pressure air storage for cylinder filling stations, and actuation air for industrial control systems. The skid-mounted format supports both fixed installation and mobile deployment, and the unit can be enclosed in a soundproof cabin or metal cabin for outdoor operation. Customization options cover structural form (D-type, M-type, S-type, W-type, V-type, Z-type), cooling method (water, air, or mixed), installation type (fixed, mobile, skid, cabin), and drive mode (electric motor or diesel engine).
 |  |  |
The compressor design incorporates four utility model patents of a piston rod thread protective sleeve (ZL 2017 2 1907021.7), a piston ring support device (ZL 2018 2 0294776.2), a range piston for symmetrical balanced compressors (ZL 2017 2 190177.0), and an integrated long-short double compartment (ZL 2018 2 0294762.0). Each unit is manufactured under a special equipment production license and undergoes pressure testing and a no-load run test before shipment. Third-party inspection certificates are available upon request.
 | | | |
 |  |  |
Lanzhou petrochemical company 240000 tonsyear ethylene production capacity restoration - adding butadiene and 1-butene unloading facilities project | Alibek oilfield in Southern Kazakhstan | Procurement of Molecular Sieve Dehydration, Ethylene Glycol Regeneration and Injection Device, and Fuel Gas Skid in Akimom Gas Field |
The V-3/300 delivers 180 m³/h (3 m³/min) of compressed air at a discharge pressure of 30 MPa(G), drawing from atmospheric inlet conditions.
Yes. Flow rate, discharge pressure, cooling method, and installation format can be adjusted to match specific project requirements. The manufacturer provides tailored engineering for each order.
Each interstage and final discharge line is fitted with a safety valve set to the stage maximum allowable working pressure. Additional protection includes high discharge temperature shutdown, low cooling-water flow alarm, and low lubricating oil pressure shutdown.
The standard configuration uses water cooling. Air cooling and mixed cooling are available as alternatives for sites with limited water supply.
Lead time depends on configuration and customization scope. Standard skid-mounted units typically ship within 60 to 90 days from order confirmation. Contact the sales team for a project-specific schedule.
