High Pressure Screw Air Compressor

Above 10 bar, ordinary screw machines begin to struggle; this high pressure screw air compressor is built for 1.2-4.0 MPa service - the band needed by PET blow molding, pressure testing and process plants that ordinary 8-bar screw machines cannot reach. A single-stage machine attempting this range would compress the whole pressure rise in one step, running at high discharge temperature and wasting energy; to avoid that, the airend uses a reinforced, pressure-strengthened design and a two-stage compression structure with interstage cooling: air is compressed in stages, with an intercooler removing heat between stages, so each stage stays at a moderate compression ratio and the machine keeps high efficiency even at 40 bar. The body is reinforced for high pressure, heavy-load bearings carry the elevated forces, and an upgraded sealing system prevents leakage at pressure. An enlarged cooling system keeps temperatures stable under sustained high-pressure running, and multiple safety elements - relief valve and pressure sensors - protect the circuit across models from 132 kW to 315 kW. The intercooled two-stage layout also means each airend works within its efficient compression ratio, so the machine holds pressure without the heat buildup and power penalty that a single-stage 40-bar attempt would produce. Upgraded seals and heavy bearings are specified for the elevated differential pressure, which is what prevents the slow leaks and bearing wear that standard compressors develop when pushed above their design band. For buyers in PET bottling, valve testing and oilfield service, this is the difference between a machine that must derate after an hour and one that holds 30-40 bar continuously through a shift. Single-stage machines cannot reach these pressures efficiently; the two-stage architecture is what makes screw compression viable above 10 bar, with standard models covering 10 and 13 bar across the 132-315 kW range, which matches the pressures most PET bottle blowing and pressure testing stations specify.

For special high-pressure models, dependable components matter more than shelf price. We maintain long-term supplier relationships and source core components from internationally recognized brands, which protects both the pressure-rated airend quality and the continuity of supply. For buyers who depend on high-pressure air in production, that means fewer seal and bearing failures and no unexpected shortages of parts specific to 40-bar machines.

Applications

PET blow molding. PET bottle blowing needs steady 30-40 bar air; two-stage compression with interstage cooling keeps efficiency high through long production shifts, and upgraded seals prevent the high-pressure leaks that would slow a filling line.

High-pressure pressure testing. Hydrostatic testing of cylinders, valves and pipelines requires controlled high pressure; the relief valve and pressure sensors give tested pressure repeatability and operator safety.

Valve and component testing. Flow and seat tests on industrial valves need accurate, sustained high pressure; reinforced airend construction holds the pressure without drift during long test cycles.

Hydropower and marine service. Hydropower station maintenance air and shipyard tools demand portable high-pressure supply; heavy-load bearings and enlarged cooling keep the machine reliable in demanding field conditions.

Oil and gas extraction support. Well-service and pneumatic tooling at extraction sites use high-pressure air; multiple safety protections and stable high-pressure output suit these rugged continuous-duty environments.

Customization

 

We configure the high-pressure screw compressor within 1.2-4.0 MPa, select power and flow to the process, set voltage and frequency for the local grid, arrange outlet connections and high-pressure piping interfaces, and offer special sealing configurations for continuous duty. Cabinet color and OEM/ODM branding are available, and a sample unit can be confirmed before mass production.

Export packaging uses a wooden pallet with plastic foam cushioning to protect the pressure circuit and cooler during long sea transport. Trade terms EXW, FOB, CIF and DDP are supported, and payment is 30% advance before production with 70% balance before shipment. Customized high-pressure units are delivered within 60 days.

FAQ

 

Q: What is the delivery time for customized high-pressure machines?

A: Customized units are delivered in 60 days, with production progress photos and videos shared at each stage for your confirmation.

Q: What warranty and after-sales support do you provide?

A: We provide a one-year warranty, a dedicated after-sales team, response within 2 hours and problem resolution within 24 hours. If goods arrive damaged, we trace the cause and arrange repair.

Q: What payment terms apply?

A: 30% advance before production and 70% balance before shipment, the same structure for standard and customized orders; we accept USD, EUR, CNY and offshore CNY.

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