59U Chemical Pump Mechanical Seal

the product specifications puts 58U and 59U in the same O-ring mechanical seal family and gives them one shared size table. The clearest model-level difference shown on the page is the stationary seat: the 59U drawing is labeled with a BP seat, while the 58U drawing is labeled with BO.

That means a 59U replacement should not be selected from shaft diameter alone. If an existing seal has a visible stationary seat, photographing and measuring that seat before ordering can help prevent a model-family match from becoming a seat mismatch.

59U Technical Specifications

59U vs. 58U: A Practical Purchasing Comparison

BP and BO seat options should be treated as installation-selection choices. Confirm the existing seat and dimensions before ordering.

Why BP Seat Confirmation Matters in Replacement Work

In a replacement project, the model marking may be incomplete, while the stationary seat is still measurable. For a 59U inquiry, confirm the BP seat where possible and compare the relevant D6 and D7 values together with shaft size and axial dimensions.

• Photograph the stationary seat before the old seal is discarded.
• Record shaft diameter d.
• Measure D6 and D7 if accessible.
• Check D3 and D4 around the seal housing/seat envelope.
• Record L and L3 for axial space.
• Send any visible model or material-code markings.

Strong Corrosive Fluids: The Medium Must Be Named

the product specifications application line says "Strong corrosive fluids," but it does not list individual chemicals. That wording is a selection category, not a complete chemical-resistance chart.

For Qixing to review a 59U configuration, the inquiry should identify the actual medium, concentration if known, and operating temperature. A fluid that is acceptable at one concentration or temperature may require a different material choice at another condition.

Operating Limits and Material Selection

The operating range is -40°C to +250°C, pressure up to 1.2 MPa and sliding speed up to 15 m/s. Final suitability still depends on the selected material combination and actual fluid conditions.

For applications near the limits, Qixing should review medium chemistry and temperature together with the required face and secondary-seal material codes before confirming the configuration.

Material Code Options

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

Because the product specifications page does not translate these codes into full material names, this product page keeps the codes as-is rather than assigning unsupported materials.

A Better 59U RFQ

Practical Selection Guidance

For a reliable 59U selection, buyers should confirm the model, seat arrangement, dimensions, chemical medium and operating conditions before ordering.

For the 59U, that means connecting four things that are easy to overlook when reading a table separately: chemical medium, BP seat, dimensional fit and the real operating conditions.

Why Choose Qixing for 59U Chemical Resistant Seals

Qixing, the mechanical seal brand of Ningbo Yade Fluid Connector Co.,Ltd, manufactures and supplies mechanical seals for industrial buyers. For 59U projects, our factory-side matching process can review the corrosive medium, shaft size, BP seat, dimensions and operating conditions together.

For OEM and replacement requirements, Qixing can work from old samples, drawings, dimensional records and operating data. This supports customized selection without making unsupported claims that every 59U configuration is universally interchangeable.

FAQ

What sizes are available for the 59U Chemical Pump Mechanical Seal?

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

What stationary seat is shown for the 59U?

The technical drawing specifically labels the 59U with a BP seat.

How is the 59U different from the 58U?

On the technical specifications, the clearest model-level distinction is the seat: 59U is shown with BP and 58U with BO. They share the same family table and operating limits.

What fluids is the 59U intended for?

The product specifications state "Strong corrosive fluids." It does not provide a detailed chemical list.

What temperature range is listed?

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

What pressure and speed are listed?

Maximum pressure is 1.2 MPa and maximum sliding speed is 15 m/s.

Can I order a 59U using only the shaft diameter?

Shaft size is important, but for replacement work the BP seat and installation dimensions should also be confirmed.

Does 250°C mean every material combination is suitable at 250°C?

No such claim is made by the technical specifications. The operating range and material codes are listed separately, so the medium and material combination should be reviewed together.

What should I send for a 59U quote?

Send the chemical medium, concentration if known, temperature, pressure, speed, shaft size, BP seat details, dimensions and any old-seal photos or codes.

Can Qixing customize the 59U?

Qixing can support customized matching based on samples, dimensions and operating conditions. Non-standard requirements should be confirmed case by case.

59U Dimension Table

Dimensions are shown in millimeters. Model names below use the Qixing-facing 59U designation.