Protech Pumps | Air-Driven Liquid Pumps

Protech air-driven liquid pumps, grouped by series. The series is set by the air drive – its bore, and whether it is single or double acting.

• PM Series – mini pumps, single acting, single 80mm air drive, capable of pressures in excess of 11,000 PSI / 800 BAR.
• PS / PSH Series – mini pumps, single acting, single 72mm air drive, in excess of 25,000 PSI / 1,723 BAR. The PSH range includes an installed hand pump attachment.
• PX Series – single acting, single 100mm air drive, in excess of 15,000 PSI / 1,040 BAR.
• PXD Series – double acting, single 100mm air drive, in excess of 11,000 PSI / 750 BAR.
• PG Series – single acting, single 160mm air drive, in excess of 45,000 PSI / 3,200 BAR.
• PGD Series – double acting, single 160mm air drive, in excess of 45,000 PSI / 3,200 BAR.
• PH Series – 250mm double acting air drive on a single liquid end, in excess of 30,682 PSI / 2,116 BAR.
• PT Series – high flow. A 250mm double acting air drive with a liquid end on each end, making them almost twice as efficient as the PH series, in excess of 30,682 PSI / 2,116 BAR.

Work from the outlet pressure first, then the flow.

Below about 15,000 psi with modest flow, a PM, PS or PX will do it in the smallest package. Above that, the 160mm drive series – PG single acting, PGD double acting – carry the range to 48,140 psi here.

When the pressure is reachable but the flow is not, move up the drive rather than the ratio: PH puts a 250mm double-acting drive on one liquid end, and PT puts a liquid end on both ends of it, which is where the high-flow duties land.

Double acting delivers on both strokes, so for the same ratio it roughly doubles the flow of the single-acting equivalent.

An air-driven unit is specified by ratio, not by horsepower. The model number is the pressure ratio: multiply it by your air drive pressure and that is the outlet stall pressure.

To size one, we need:

• Media being pumped, and its temperature
• Inlet pressure available
• Outlet pressure required
• Flow rate required at that outlet pressure
• Air drive pressure and volume available
• Duty cycle – intermittent, or continuous
• Seal and wetted-material requirements
• Area classification, if the installation is hazardous

Send those and we will come back with the series, the model and the options rather than a catalogue page.

Yes – that is the normal operating condition. The pump strokes until outlet pressure reaches the ratio multiplied by the air drive pressure, then stalls and holds there, drawing no air until pressure drops.

That is what makes them suited to pressure testing and hold testing, where an electrically driven pump would have to be controlled or bypassed.

No electrical supply at the pump, no heat build-up, and the unit stalls at pressure and holds it without drawing power or cycling.

They are inherently suited to hazardous areas, they can be run dead-headed indefinitely, and output is adjusted by a single air regulator rather than by changing the pump.

Protech units need no airline lubrication, and keep the hydraulic and pneumatic seals separated and drained.

Stainless steel wetted materials as standard, with specialised construction materials available on request.

Polyurethane pressure seals are standard. UHMWPE, PTFE and other special seals are available where the media or the temperature needs them – tell us what you are pumping and we will specify the seal with the pump rather than after it.

Yes. Every series here is also available as a complete packaged system – the unit mounted with its air drive controls, filtration, regulation, gauges, relief and the plumbing between them, on a frame or in an enclosure.

Tell us the duty and where it has to sit, and we will quote the package rather than the bare unit.

Seal kits, valve assemblies, air drive repair kits and wetted-end spares are available for every series on this page.

Quote the full model number off the nameplate. The same series can carry different seal materials depending on how it was originally specified, so the model number is what separates them.

The Protech model number if you have it. If you do not, send the duty – media, inlet pressure, outlet pressure, flow, air available – and we will select it.

Add quantity, the ship-to ZIP code, and the required date. If it is a replacement for a unit already in service, the model and serial off the existing nameplate is the fastest route of all.

Call 504-228-4049 or email sales@hydrotechnologysystems.supply.

• PM Series brochure
• PG Series brochure
• PGD Series brochure

These are the Protech brochures currently hosted on this store. For the PS, PX, PXD, PH and PT series, ask and we will send the current literature with the quote.