FH Series Medium & High Pressure Piston Air Compressors

In blow molding, pressure testing and leak checking of pressure vessels, hydropower station equipment and military support, the air pressure needed is usually far above that of an ordinary workshop. A conventional compressor at 0.7-0.8MPa is clearly not enough here, while renting high-pressure cylinder banks temporarily brings high cost and makes continuous supply difficult. For these users, a medium-high pressure compressor that can steadily deliver above 1.6MPa over the long term is the prerequisite for actually running the process.

The Fusheng FH Series medium-high pressure piston compressor is designed for exactly these needs. It uses a multi-stage compression structure, with working pressure covering three levels—1.6MPa, 3.5MPa and 4.5MPa—air delivery of 0.25-1.1m³/min and power of 2.2-15kW. With ample output and high efficiency, it is a common choice in blow molding machinery, pressure testing and leak checking, hydropower stations, military support and similar industries.

Multi-Stage Compression: The Way to Solve Medium-High Pressure Duty

The higher the pressure, the harder single-stage compression works. In single-stage piston compression, as pressure rises the discharge temperature climbs sharply, compression efficiency drops and the thermal load on components grows. The FH Series uses multi-stage compression, splitting the total pressure across several stages: each stage has a smaller pressure ratio and more controllable temperature rise, and the result is higher pressure and steadier output for the same input power. This is also why it can cover the three pressure levels of 1.6MPa, 3.5MPa and 4.5MPa at once.

Intercooling and Water Separation: Bringing Discharge Temperature Down

Higher-power models are fitted with an intercooler and a high-efficiency water separator. The intercooler brings the gas temperature down between stages, lowering the thermal load on downstream components and making the gas entering the next stage denser and easier to compress; the high-efficiency water separator promptly removes condensate formed during compression, reducing the chance of moisture travelling with the air into the piping and the air-consuming equipment. For pressure testing, blow molding and similar situations sensitive to air stability, a low discharge temperature and low moisture mean fewer fluctuations and fewer faults.

Low Vibration, Low Noise and Long-Life Design

One easily overlooked detail in the data sheet is that FH Series speeds are mostly between 680-860rpm, a relatively low-speed design. Low speed brings smaller vibration, lower noise and slower wear—exactly the basis of a long-life design. Combined with a reinforced cooling system, the machine keeps up stable performance even under long continuous running.

Technical Specifications

The data sheet shows that the FH Series is organised around pressure levels: the 1.6MPa models cover air delivery of 0.25-1.1m³/min, while the 3.5MPa and 4.5MPa models provide 0.25-1.0m³/min at higher pressure. Note that the higher the pressure level, the smaller the air delivery a comparable model can produce, so selection should first lock in the pressure the process needs, then match the air delivery.

Industries and Applications

• Blow molding machinery: medium-high pressure air is used for forming and blowing, and pressure stability directly affects yield;
• Pressure and leak testing: airtightness testing of pressure vessels, piping and valves needs a stable and controllable high-pressure source;
• Hydropower stations: high-pressure air for operating and maintaining units, gates and similar equipment;
• Military support: where air reliability and continuous supply are demanding;
• Laboratory pressure testing, automotive service and truck tire inflation: medium-pressure needs that call for fast inflation and high efficiency.

Selection Advice

1. Set the pressure level first: whether 1.6MPa, 3.5MPa or 4.5MPa depends on the actual demand of the most demanding equipment, and setting pressure too high causes unnecessary energy consumption and equipment cost;
2. Match air delivery to actual demand: consider both the peak and the normal duty of the air-consuming equipment, avoiding a small unit straining or a large unit idling;
3. Pay attention to cooling and treatment: for multi-stage models, pair appropriate cooling and separation measures to control discharge temperature and moisture;
4. Weigh continuous operation and maintenance convenience: routine inspection and replacement of wear parts on a high-pressure unit should be part of the long-term cost assessment.

Conclusion

The difficulty with medium-high pressure air is never whether the pressure can be reached but whether it can be held steadily over the long term. The Fusheng FH Series answers the latter with multi-stage compression, reinforced cooling and a low-speed, long-life design. When a process needs a stable air supply above 1.6MPa, it is an option worth evaluating first.