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One of Liquiflo's many strengths is their ability to design and manufacture Specialty Pumps. A Special Pump can be as simple as modifying a port configuration or as complex as a complete new pump design. Liquiflo's design and manufacturing engineers use their years of pumping experience and knowledge of engineered materials to custom design a pump to meet specific applications. To date, Liquiflo has designed over 700 different specialty pumps which have solved numerous problems in the chemical and industrial marketplace throughout the world.

If you have an application that cannot use a standard off-the-shelf pump, please give us the opportunity to design a custom pump that will meet the specific needs of your application.

Unit of Measure

Few Examples


  • “High Viscosity” Pump

    Challenge: To pump a mastic with a viscosity similar to caulking at a differential pressure up to 500 psi and suction pressure of 1000 psi. The pump needed to be mounted on a 4-axis robotic head where it needed to discharge a bead of mastic at a maximum rate of 17 linear feet per second. In order to keep the inertia to a minimum, the pump needed to weigh less than 10 lbs.

    Solution: A variation of the 37 Series was used. The pump casings were made of aluminum to help minimize the weight. The internal construction was: hardened steel gears, wear plates and shafts, sintered bronze bearings isolated from the pumpage by polypac seals and externally grease lubricated. The pump was close-coupled to a hydraulic motor and operated at a maximum speed of 50 rpm. From design to shipment, the working prototype was completed in just under eight weeks, and full-scale production was completed within sixteen weeks.

  • “Ultra-High Pressure” Mag-Drive Pump

    Challenge: Custom requirements were for a mag-drive pump that could handle system pressures up to 1500 psi (100 bar).

    Solution: Containment Can and housings had to be designed to withstand the unusually high pressure without catastrophic failure or distortion that would affect operating characteristics. A solid 316 SS bar stock body with extra heavy bolting was used in conjunction with an extra heavy-walled containment can to withstand the extremely high pressures. Test pressures of the newly designed pump exceeded 4500 psi (300 bar). From design to shipment, the working prototype was completed in under ten weeks.

  • “Glove Box” Nuclear Pump

    Challenge: A pump was required for processing high-grade plutonium. The pump needed to be mounted inside the “glove box.” The motor would be mounted on the outside of the glove box and the pump would be mounted on the inside of the glove box. In addition, due to the radio activity of the material being pumped, a further requirement was to have the ability to remove the pump cartridge and/or the motor, without creating a breach in the glove box wall.

    Solution: A double containment shell solved the problem. One containment can was mounted to the pump in the normal manner while the second containment can was mounted to the glove box wall. This configuration maintained closure in the event that either the pump or the motor needed to be removed for repair or replacement.

  • “Bromine” Plastic Gear Pump

    Challenge: The requirement was to pump pure liquid bromine at a differential pressure of 30 psi.

    Solution: This is one of a number of gear pumps that Liquiflo made from plastic. This pump in particular was a Kynar version of a 35 mag drive with Kynar coated inner magnet and containment can, tantalum shafting, and unfilled Kynar housings. Other engineered plastics that Liquiflo has manufactured gear pumps from include CPVC for herbicide service, PTFE for ultra pure water service and Ryton for various services.

  • “Super Bullet” (Colloidal Suspension) Pump

    Challenge: The requirement was to build a non-pulsing positive displacement pump for pumping water containing colloidal silica for the paper industry. The colloidal silica particles are extremely abrasive and small in size – just 2-10 microns. These abrasive particles work their way into the smallest of crevices and accelerate wear of surfaces that exhibit any relative motion. The customer found it impossible to find a pump that would last more than a few weeks in this extremely difficult service.

    Solution: Liquiflo’s designers solved this challenging application using a variety of engineered materials that would work well together even in an extremely abrasive environment. They also redesigned the internal configuration of the pump to minimize the abrasive action that normally takes place. After an extended effort, the chosen materials for the internals of the pump were SiC on SiC bearings, and bearing-grade PEEK gears. A small amount of carbon graphite was added to the inner SiC sleeve bearing to give it some self-lubricating properties. With a service life now in excess of 12 months, our satisfied customer respectfully nicknamed it The “Super Bullet.”