Air driven pumps offer an ideal solution for applications requiring high pressure liquids such as well head controls, clamping or high pressure testing.

Hydraulics International air driven liquid pumps operate on the principle of differential working areas.  An air piston drives a smaller diameter plunger or piston to provide a pressure ratio. 

HII liquid pumps will cycle automatically when compressed air is first applied to the drive.  It will start cycling at its maximum speed thus producing maximum fluid flow.  At this stage, the pump is acting as a transfer pump, filling the pressure system with fluid.  As resistance increases in the system (creating backpressure to the pump), the pump will decrease its reciprocating action.  Backpressure in the system finally balances with the incoming air drive pressure times the ratio.  At this point, the pump will stall and maintain pressure without consuming any energy.  If there is further demand on the system for flow, the pump will automatically start cycling again.

Features

• Air drive line lubrication not required
• Self-priming for immediate operation
• Compatible with all hydraulic fluids, plain water, distilled and deionized water, solvents, mild chemicals and most liquified aerosol type gases
• Range of models to provide up to 80,000 psi intermittent output pressure
• Hydraulic pressure is held without energy consumption
• Explosion proof--- requires no electrical power or connections
• Intrinsically safe
• Compact, lightweight and weatherproof
• Easy to adapt automatic controls
• Stainless steel hydraulic body, check valves and trim are standard, except -4 and -7 models
• Offer a wide range of standard modifications
• Contamination tolerant
• Outlet stall pressure pre-determined by the air drive regulator
• High pressure capability - up to 80,000 psi
• Ideal for stop-start applications under full load
• Easy to install and operate

•  Special Air Driven Liquid Pump Packages