ARO is a manufacturer of pneumatic piston pumps, also called air operated piston pumps, and hydraulic piston pumps. The piston pump technology is capable of handling a large range of viscous materials in excess of 1 000 000 cP. With a wide selection of pressure ratios and displacement rates available, ARO offers a number of piston pump packages that can meet your specific application and flow rates needs.

• 2-Ball piston pumps

• 4-Ball piston pumps

• Chop-Check piston pumps

• 2-ball piston pumps (68.6L/min) handling fluids up to 100,000 cPs.

• 4-ball piston pumps (124L/min) handling fluids up to 12,500 cPs

• Chop-Check piston pumps (46.3L/min) handling fluids with a range between 15,000-1,000,000 cPs.

• Applications advantages of 2-balls:

  • Spray: 2-ball pumps deliver the constant flow rate and pressure needed for consistent and efficient coatings applications

  • Transfer & Supply: Depending on the model, some 2-ball pumps can achieve flow rates up to 18.1 gpm, providing dependable results

  • Extrusion: 2-ball pumps generate pressure to handle extrusion of low-to medium-viscosity 

  • Lubrication:  ARO® 2-balls pumps provide the flow and pressure required for moving light oils and grease lubricants

  • High Pressure Cleaning: ARO® Wash Pump Packages are portable and offer the the right option for industrial cleaning applications

• Applications advantages of 4-balls:

  • Transfer & Supply: 4-ball pumps are designed to move high volumes of fluids in order to minimize time spent filling or emptying large containers. The high flow rate is a result of double-acting pumping (draws material on the upstroke and downstroke) and is ideal for the large scale transfer of paints, chemicals, varnishes, enamels, lacquers and other low-to-medium viscosity fluids. 

  Another common application: circulating fluid from the original container to the point of use, and then back.

• Applications advantages of Chop-Check:

  • Extrusion: Chop-Check pumps are workhorses - able to deliver viscous adhesives, sealants, caulking and heavy lubricants to the application point at the desired pressure and flow rate. 

  • Transfer & Supply: Depending on the model, some Chop-Check pumps are capable of achieving flow rates up to 12.2 gpm, ensuring efficient transfer of heavy greases, inks and other viscous materials.

• Materials advantages of 2-balls:

  • Sheer sensitive materials: ARO® 2-ball pumps minimize friction points to prevent fluid shear, when compared to other similar pumping technologies

  • Abrasive and high solid materials: ARO 2-ball pump minimize friction points and allow smooth passages to maintain fluid consistency

  • Optional ceramic coating provides an even
    stronger defense against highly abrasive fluids like paint and glass-filled sealer

• Materials advantages of 4-balls:

  • Corrosive materials: ARO® 4-ball lower ends are constructed with stainless steel to maximize fluid compatibility with water based materials.

  • Abrasive materials: A ceramic coating on the plunger rod and cylinder tube come standard on ARO® 4-ball pumps, protecting from highly abrasive materials and extending the service life of these parts up to 2x.  

• Materials advantages of Chop-Checks:

  Chop-Check pumps have a primer piston to ‘feed’ material into the pump. They are often used in conjunction with a follower plate to force material down. This prevents loss of prime due to Channeling - a condition where the pump inlet becomes surrounded by air due to the cavity formed when a high viscosity material does not level off when removed (Slumpability).

  • Stringy materials: Chop-Checks have mechanical, flat checks to over come materials that resist cut-off and adhereto themselves.

  • Tacky materials: Chop-Check pump options come in high ratios to generate the fluid pressure needed to move materials that will adhere to hoses and equipment while wet.