Mechanical Seal Replacement for Grundfos SL1.50.80.40.2.51D
- Replacement of Grundfos mechanical seal SL1.50.80.40.2.51D, used in sewage pump
Replacement seal for Grundfos SL1.50.80.40.2.51D
This replacement mechanical seal is offered for maintenance and repair enquiries for Grundfos SL1.50.80.40.2.51D sewage pumps. Confirm the pump product number and existing seal dimensions before ordering: the model designation alone is not enough to select the correct assembly.
Confirm the fit before ordering
- Pump identification: send a clear nameplate photo showing the complete model, product number and serial number.
- Existing seal: include photos of the complete assembly and any original part number or material markings.
- Installation dimensions: confirm shaft diameter, seat dimensions and installed length against a drawing or sample.
- Operating conditions: specify the pumped liquid, solids, temperature, pressure and chemical cleaning exposure.
- Scope of supply: identify the assembly or components required and the quantity.
Construction and size options
Unbalanced, multiple-spring construction. Listed size options are 22 mm and 32 mm. Select the size only after checking the actual shaft and installation dimensions; these options are not a size assignment for every version of the pump.
Operating limits
- Listed temperature range: −40 to 150 °C
- Listed maximum sliding speed: 15 m/s
- Listed maximum pressure: 20 bar
Confirm the allowable limits for the selected material combination and seal configuration in the quotation. These values are not pump ratings and should not be assumed to apply simultaneously.
Material options
- Seal faces: carbon, silicon carbide, sintered silicon carbide and tungsten carbide.
- Secondary seals: NBR, EPDM and FKM (Viton).
- Spring and metal parts: stainless steel 304, stainless steel 316 and Hastelloy C.
Material availability and compatibility must be confirmed for the selected assembly and pumped liquid. Include abrasive solids and cleaning chemicals when describing the application.
Request a quotation and seal compatibility check or browse Grundfos mechanical seal replacements.
Our Advantages
Accurate Replacement Matching
This replacement mechanical seal is designed for Grundfos SL1.50.80.40.2.51D sewage pump applications. We check the shaft size, seal structure, working medium, pressure and temperature before quotation, helping customers avoid wrong model selection and installation problems.
Multiple Material Option
Different working conditions require different seal face and elastomer materials. We can supply Carbon, Silicon Carbide, Sintered Silicon Carbide and Tungsten Carbide seal faces, with NBR, EPDM or Viton secondary seals. Stainless steel 304, 316 and Hastelloy C metal parts are available according to the medium and corrosion level.
Sewage Duty Assessment
For sewage pump service, share the liquid composition, solids, temperature, pressure and cleaning chemicals. Confirm the seal face and elastomer combination for the actual duty. Vibration, abrasive solids and abnormal operating conditions require assessment before selecting a replacement.
Custom Support Before Production
If the original Grundfos seal code is unclear, customers can send pump nameplate photos, old seal photos, shaft diameter and working condition details. Our team will help confirm the replacement model before production or shipment.
Production Process
Production Line
Equipment
FAQ
Is the pump model enough to confirm compatibility?
No. Provide the complete pump product number, old-seal photos and installation dimensions. Confirm the proposed replacement drawing before ordering.
Should I choose the 22 mm or 32 mm option?
Match the actual shaft diameter, seat dimensions and installed length. The pump model alone does not establish which size is correct.
What if the original seal part number is missing?
Send a nameplate photo, photos of the complete old assembly and any measurements available. A drawing or sample may be needed to resolve remaining differences.
How are materials selected for sewage service?
Specify the liquid, solids, temperature and cleaning chemicals. The face and elastomer combination must be checked for that duty and confirmed in the quotation.
What should the quotation confirm?
Confirm the assembly drawing, materials, operating limits, supplied components, quantity and delivery requirements.