58U Chemical Pump Mechanical Seal

For many standard mechanical seals, buyers start with shaft size and then work through the dimensions. For the 58U Chemical Pump Mechanical Seal, the medium should move much earlier in the discussion. the product specifications specifically assigns the 58U/59U family to strong corrosive fluids, so fluid composition, concentration and temperature are central to a correct selection.

That changes the purchasing conversation. A 58U inquiry should not stop at "I need 40 mm." Qixing should also know what the liquid is, how hot it runs, the pressure, the speed and any known material-code requirement before the configuration is confirmed.

technical Operating Window

58U vs. 59U: Same Family, Different Seat Reference

the product specifications combines 58U and 59U on one page and uses one shared dimensional table. The section drawing, however, labels 58U with a BO seat and 59U with a BP seat. At the same time, the series note says BP is the standard seat and BO the alternative.

For the 58U, the key model-specific detail is the BO seat arrangement. Confirm the seat during replacement matching rather than relying on the family name alone.

Why the -40°C to +250°C Range Needs Careful Reading

The operating temperature range is -40°C to +250°C. This does not mean every material-code combination is automatically suitable across the entire range; chemical compatibility and temperature capability depend on the selected seal faces and secondary seal.

For corrosive service near the upper or lower temperature limit, the inquiry should include the actual fluid and temperature together. This allows the material selection to be reviewed against the intended duty instead of treating the product specifications limit as a universal guarantee.

Chemical Resistance Is Not One Material

Material options are identified by codes. If the required code is unknown, provide the medium and duty conditions so Qixing can review a suitable combination.

• Stationary ring: V1 / Q1 / U2
• Rotary ring: B / A / U2 / Q2
• Secondary seal: T
• Spring and metal parts: F / G / M

For website conversion, this is also useful: a buyer who knows the old material code can send it directly, while buyers who do not know the code can provide the medium, concentration and temperature for Qixing to review.

Corrosive-Service Inquiry Checklist

When a 58U Replacement Should Be Measured, Not Guessed

The 58U/59U family shares one size table covering 14 mm through 100 mm. For a replacement order, shaft diameter is the first check, but it should be followed by D3, D4, L, L3, D6 and D7 where the old installation allows measurement.

This is particularly important if the old nameplate or seal marking is incomplete. A clear photo of the stationary seat can also help confirm whether the old assembly follows the 58U BO-seat arrangement.

Where the 58U Fits in a Chemical-Handling Project

The 58U is intended for strong corrosive fluids. Because individual chemicals can behave differently with concentration and temperature, Qixing uses the customer's actual medium data to review suitability for a specific application.

Why Choose Qixing for 58U Chemical Resistant Seals

Qixing, the mechanical seal brand of Ningbo Yade Fluid Connector Co.,Ltd, manufactures and supplies mechanical seals for industrial buyers. For the 58U, our factory-side selection process can start from the chemical medium and operating conditions, then move to shaft size, seat and dimensions.

For OEM and replacement projects, Qixing can review samples, drawings, model references and dimensional data together with the duty conditions. This makes the quotation more useful for corrosive-service purchasing than a generic model-only quote.

FAQ

What shaft sizes are available for the 58U Chemical Pump Mechanical Seal?

The shared 58U/59U dimension table covers shaft diameters from 14 mm to 100 mm.

What temperature range is listed for the 58U?

The operating temperature range is -40°C to +250°C.

What is the maximum listed pressure?

The product specifications list pressure up to 1.2 MPa.

What is the maximum listed sliding speed?

The product specifications list sliding speed up to 15 m/s.

What fluids is the 58U intended for?

The application range states "Strong corrosive fluids." It does not provide a detailed chemical list.

Which stationary seat is used by the 58U?

The drawing specifically labels the 58U with a BO seat. The same page labels the 59U with a BP seat.

Why does the page also say BP is standard and BO is alternative?

That statement is written at the combined 58U/59U series level. Because the model drawing specifically identifies 58U with BO, the seat should be confirmed during selection rather than inferred from the family note alone.

Can every material option work at 250°C?

Confirm the medium and temperature before selection because material-code combinations can have different compatibility limits.

What should I send for a corrosive-service quotation?

Send the fluid, concentration, temperature, pressure, speed, shaft size, existing seat information and any known material codes.

Can Qixing customize the 58U?

Qixing can support customized selection and matching using dimensions, samples, medium data and operating conditions. Non-standard requirements should be confirmed case by case.

58U Dimension Table

Dimensions are shown in millimeters. Model names below use the Qixing-facing 58U designation.