High-Pressure Air Driven Pumps

Operating principles of pneumatic driven liquid pumps

The pneumatic pumps automatically reciprocate on a differential piston principle. In a hydraulic system, smaller pistons are directly driven by larger pistons whereas the larger pistons are driven by relatively low pressure compressed air.

The model coding of Haskel’s air-driven liquid pumps indicates the nominal ratio between the air piston and the hydraulic piston. The maximum hydraulic output pressure is calculated by multiplying the ratio of the pump by the shop air pressure being used to drive the pump.

When the pump is first turned on, it acts as a transfer pump, filling the volume with liquid. During this time, the pump cycles at its maximum speed. Once the liquid has been transferred, pressure inside of the pump will increase until it reaches a certain point and then begins to slow down naturally. The stalled condition can last indefinitely unless something disrupts equilibrium (for example: turning off the power).

The pump will automatically start to cycle once the pressure is released or if the drive air pressure is increased. This feature makes this type of pump an excellent choice for pressure testing.

Haskel pneumatic driven liquid pumps are not only extremely reliable, robust, compact, and easy to maintain, but also offer the following advantages:

• No heat, flame or spark risk during pneumatic operation
• Able to reach up to 100,000 psi (7000 bar)
• ATEX certified
• Infinitely variable cycle rate
• Block function at predetermined pressure to maintain this pressure without consuming energy
• Trouble-free start/stop applications
• Easy automation with a wide range of control and adjustment options available
• Suitable for most liquids and liquefied gasses
• No need for air-line lubrication, reducing costs and preventing contamination

Pneumatic driven liquid pumps efficiently convert compressed air into hydraulic power to meet the needs of any application that pressurizes components and holds them at a set pressure for an extended period of time. Hydrostatic testing is one of the most common applications for the Haskel Pneumatic Liquid Pump. Used in hydrostatic testing, the Haskel Pneumatic Liquid Pump acts as a hydrostatic test pump to pressure test the components of your particular system.

Here is the list of additional industrial applications:

• Bolt Tensioning
• Brake Application
• Calibration
• Component flush
• Controlled force, paper mills
• Clamping
• Crimping
• Cutting
• Cylinder Testing – DOT
• Down Hole upstream pressure equalization
• Flange spreaders
• Fluid charging
• Gun turret leveling
• Hydraulic power unit
• Hydraulic Cylinder Actuation
• Isostatic Pressing
• Jacking and lifting
• LPG reclaim
• Lubricating

• Machine counter balance
• Mechanical seal pressurization - barrier fluids
• Metal forming/Hydraulic forming
• Methanol Injection
• Oil Injection for bearing removal
• Packer inflation
• Power pressing
• Press Safety Overload
• Pressure Testing
• Proof testing components
• Positioning cylinders
• Relief valve testing and setting
• Roller Tensioning
• Sampling
• Silicon chip Cleaning (washing machine)
• Swaging
• Testing and operating downhole equipment
• Valve actuation
• Vehicle safety braking
• Water Jet cutting - low density
• Wellhead control
• Work holding

To choose the right pump, you need to match the pump's ratio to your specific output pressure requirements. The table at the bottom of the page allows you to review and compare the key technical data across Haskel's wide range of pneumatic pump models. Additionally, the list of our pumps is categorized into different series outlined below: