High Pressure Pumps: Hydraulic Pumps Rated 250 to 420 bar

What Counts as High Pressure?

Most mobile and industrial hydraulics run below about 250 bar. Above that, standard gear and vane pumps lose efficiency, run hot and wear quickly. Between 250 and 420 bar, you need a pump designed for the load, with a stronger housing, better bearings and tighter control of internal leakage.

Pump Designs That Reach These Pressures

• Axial piston pumps: the most common choice, available as fixed or variable displacement. Many are rated for 350 bar continuous and around 420 bar peak.
• Radial piston pumps: very stiff and compact, often used where pressure must hold steady. Many go well beyond 420 bar.
• High pressure gear pumps: some heavy duty designs reach around 300 bar on short, simple duties, at a lower cost.

This range groups these designs by pressure rating. To dig into how each one works, see its own pump type page.

Continuous, Intermittent and Peak

• Continuous: the pressure the pump can hold all day.
• Intermittent: a higher pressure allowed for short periods, often a few seconds in each minute.
• Peak: a brief spike the pump can survive, such as a valve slamming shut.

Size your pump on the continuous rating. If your press holds 380 bar for long periods, a pump rated 350 bar continuous and 420 bar peak is the wrong choice, even though the peak figure looks fine.

The Rest of the Circuit Must Match

A high-pressure pump is only as safe as the parts around it:

• Hoses, pipes and fittings must carry a working pressure rating above your relief setting.
• Set the relief valve just above the working pressure, and never above the rating of the weakest part.
• Accumulators need the right pressure rating and a correct pre charge.
• Fit a pressure sensor or gauge you can read easily, so changes are spotted early.

Safety First

• Never loosen a fitting while the system is under pressure. Release the stored pressure from accumulators first.
• Never feel for leaks with your hand. At these pressures, a pinhole jet can inject oil through skin.
• Use rated test points and gauges, not makeshift adaptors.

High Pressure Pumps Specifications to Check

• Continuous, intermittent and peak pressure ratings
• Displacement, and flow at your working speed
• Fixed or variable displacement, and the control type
• Shaft, flange and port details for replacements
• Oil type, and the cleanliness level the pump needs

High pressure pumps are sensitive to dirty oil, so good filtration matters even more than usual.

Where They Work

Hydraulic presses and forming machines, steel mills, test rigs, bolt tensioning tools, heavy lifting jacks and injection moulding machines all rely on high pressure pumps. Cross-reference families such as the Parker PV series are a common starting point for replacements.

Why Buy From TSA Hydraulics Engineering

As a high-pressure pumps supplier, we check the continuous rating against your duty, not just the headline figure. You get clear prices in AUD, OEM or equivalent options, and help sourcing high-pressure pump replacement parts such as seal kits, rotating groups and controls. We tell you upfront whether a pump is genuine or an equivalent.