Stainless steel gear pumps handle corrosive, aqueous, and chemically demanding fluids in applications where gray cast iron is not an option. This page is divided into three sections: pumps without motors, pumps with motors, and models with PEEK gears.
The choice of model depends on the medium, lubricity, viscosity, temperature, and pressure. Send us your operating data, and we'll select the right pump for you.
Pump head with exposed shaft end, stainless steel gears
Delivery rate: 1.15 to 24 l/min
Viscosity: 1,4 bis 2.500 mm²/s
Performance: Drive on customer side
Pump head with exposed shaft end, PEEK gears
Delivery rate: 3 to 24 l/min
Viscosity: 1,4 bis 2.500 mm²/s
Performance: Drive on customer side
Motor pump, stainless steel gears
Delivery rate: 1.15 to 24 l/min
Viscosity: 1,4 bis 2.500 mm²/s
Performance: 0,12 bis 1,5 kW
Motor pump, PEEK gears
Delivery rate: 3 to 24 l/min
Viscosity: 1,4 bis 2.500 mm²/s
Performance: 0,12 bis 0,75 kW
The stainless steel product line has a modular design. Depending on the application, the pump size, design, drive, and gear material are combined.
First question: Drive system: If a motor or gearbox is already in place, the pump without a motor—that is, the pump head with a free shaft end—will fit. If a ready-to-connect unit is needed, the motorized pump will fit.
Second question, medium: If the medium provides sufficient lubrication, stainless steel gears will operate. If it provides little or no lubrication—as is the case with water and aqueous solutions—a PEEK version may be considered. PEEK is available in both motorized and non-motorized versions.
Stainless steel is used when the medium is corrosive or when the material is specified: for solvents, acids, aqueous process media, or emulsions. In such cases, the housing, shafts, and housing components are made of 1.4571 stainless steel.
The materials are uniformly specified. The housings and shafts are made of 1.4571 stainless steel. In the standard version, the gears are also made of 1.4571. If the medium does not provide sufficient lubrication, the stainless steel gears run dry against each other. For such cases, there is a PEEK version, in which the shafts remain made of 1.4571 and the gears are made of PEEK. This applies primarily to water and aqueous media.
The Series E/F is a pump head with an exposed shaft end, without its own motor. It is used when a motor, gearbox, or drive is already in place or is designed separately. Flow rate: 1.15 to 24 l/min; viscosity: 1.4 to 2,500 mm²/s; fluid temperature: -40 to +200 °C; housing, shafts, and gears made of 1.4571 stainless steel.
The E/F version requires a minimum level of lubrication from the medium. If the medium does not provide sufficient lubrication, the E/F-PEEK version is recommended; see the section on PEEK versions below.
The Series E/FLM is a fully assembled unit consisting of a pump, motor, coupling, and pump bracket. It is used when a ready-to-operate unit is required. Power output: 0.12 to 1.5 kW; available up to and including size 3; flow rate and viscosity are the same as for the version without a motor.
Available with a variable-frequency drive upon request. This allows the speed—and thus the flow rate—to be adjusted to the process, for example during dosing or circulation in partial-load operation. For media with low lubricity, the motor pump is also available in a PEEK version (E/FLM-PEEK); see the next section.
Other configurations, such as E/D, E/FKM, E/FOM, and E/FAM, are also available and are designed based on the installation situation and the required motorization. In practice, E/F, E/F-PEEK, E/FLM, and E/FLM-PEEK are used almost exclusively; therefore, these four are the focus of this page. There are currently no separate product pages for the other variants.
All stainless steel models can generally also be equipped with PEEK gears, from sizes 314 through 333. A relief valve is not available in stainless steel; in such cases, pressure relief is handled by the system itself.
The E/FOM design can also be equipped with a magnetic coupling if a hermetically sealed design without a dynamic shaft seal is required.
The choice of gears depends on the lubricating properties of the medium. Oils, heat transfer fluids, and similar media provide sufficient lubrication; in these cases, stainless steel gears are used. Water, aqueous solutions, solvents, and low-viscosity chemicals provide little lubrication; in these cases, PEEK gears are tested.
E/F-PEEK is the motorless version with PEEK gears, with a flow rate of 3 to 24 l/min. E/FLM-PEEK is the motor pump with PEEK gears, with a power rating of 0.12 to 0.75 kW. In both cases, the housing and shafts are made of 1.4571 stainless steel, and the gears are made of PEEK.
Typical examples include the chemical and process industries, paints and coatings, and mechanical and plant engineering. The system handles solvents, acids, and alkalis; emulsions and cooling lubricants; aqueous process media; as well as oils and heat transfer oils.
The standard product line is not approved for food and hygiene requirements. For such requirements, we work with you to evaluate materials, seals, and surfaces.
If the medium is corrosive, aqueous, or chemically demanding, or if the material is specified and gray cast iron is therefore not an option.
If a drive is included or is designed separately, the E/F and E/F-PEEK models are suitable. If a ready-to-use unit is required, the E/FLM and E/FLM-PEEK models are suitable.
Stainless steel gears require a minimum amount of lubrication. PEEK gears are tested with media that provide little to no lubrication.
Typically, a design with PEEK gears is tested for this purpose. The key factors are the medium, temperature, pressure, viscosity, and operating conditions.
Yes, via a frequency converter on the models equipped with a motor.
Please provide us with the fluid type, flow rate, pressure, temperature, and viscosity. We’ll determine which stainless steel gear pump is best suited for your application and get back to you with a technically sound recommendation.