59B Chemical Pump Mechanical Seal

The product specifications give 58B and 59B one shared size table and one common operating envelope. What it does not give is a detailed written explanation of how the two arrangements differ in service. The page simply labels the upper drawing 59B and the lower drawing 58B.

For replacement work, that makes the physical seal in front of you especially valuable. Before disposal, photograph the assembly, record the shaft size, identify the stationary seat if possible, and measure the main axial and radial dimensions. Those details can be more decisive than a partial model marking.

Technical Specifications

59B and 58B Share a Table - That Is Exactly Why Confirmation Matters

The shared table can make the family look interchangeable at first glance. However, the technical drawing shows two separately labeled arrangements. Because the product specifications does not state that every 58B and 59B configuration is directly interchangeable, Qixing should verify the existing geometry rather than make that assumption.

A useful replacement check is to compare d, D2, D3, D4, L, L2, L3, d6 and D7 with the old assembly. Those are the dimensions actually published in the dimension table.

Seat Selection

BP is the standard seat and BO is an alternative. For replacement projects, confirm the existing seat arrangement and dimensions before ordering.

If the existing stationary seat can be identified, include that information in the RFQ. If it cannot, provide photos and dimensions so the seat selection can be checked against the installation.

A 2.5 MPa Corrosive-Service Rating Changes the Questions We Ask

The 58B/59B family is listed for strong corrosive fluids and a maximum pressure of 2.5 MPa. That combination makes pressure only one part of the selection. Fluid chemistry, concentration and temperature remain essential because the page does not provide a universal chemical-resistance chart.

For duties near the listed pressure or temperature limits, Qixing should review the actual medium and requested material codes together with the operating conditions before confirming the seal configuration.

Material Codes: Keep the Trail Intact

The product specifications give material selections as codes rather than full names. To avoid inventing information, this page keeps the codes exactly as supplied:

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

Bench-Side Check Before You Remove the 59B

• Photograph the complete seal from both sides.
• Record shaft diameter d.
• Measure D2, D3 and D4 if accessible.
• Record the axial dimensions L, L2 and L3.
• Measure d6 and D7 around the shaft/seat area.
• Photograph the stationary seat separately.
• Note any visible material codes or old model markings.
• Record the working medium, concentration, temperature, pressure and speed.

A Better RFQ for 59B

Why Choose Qixing for a 59B Replacement or OEM Project

Qixing, the mechanical seal brand of Ningbo Yade Fluid Connector Co.,Ltd, manufactures and supplies mechanical seals for industrial buyers. For 59B projects, we can review the old seal geometry, seat requirement, chemical medium and operating conditions together instead of quoting from the model number alone.

For OEM or replacement work, Qixing can use drawings, samples, dimensional measurements and process data to support customized matching. Any non-standard configuration should be confirmed case by case.

Have an old 59B seal on the bench? Send Qixing photos, dimensions, seat information and corrosive-service conditions for factory matching and quotation.

FAQ

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

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

What operating range is listed for the 59B family?

The operating range is -40°C to +250°C, pressure up to 2.5 MPa and sliding speed up to 15 m/s.

What fluids is the 59B intended for?

The product specifications state "Strong corrosive fluids." It does not list individual chemicals.

Is BP the standard seat?

Yes. The 58B/59B series note lists BP as standard and BO as alternative.

Does the 59B always use a BP seat?

No. The page does not explicitly assign BP only to 59B, so the seat arrangement should be confirmed before ordering.

How is 59B different from 58B?

The 58B and 59B use related arrangements. Replacement selection should include dimensional and seat confirmation.

Can I order only by shaft size?

Shaft size is the first filter, but the shared family table and separate drawings make dimensional confirmation advisable for replacement work.

What dimensions should I send?

The dimension table publishes d, D2, D3, D4, L, L2, L3, d6 and D7.

Does the 250°C limit apply to every material combination?

Operating limits and material codes should be reviewed together with the actual fluid and temperature before final selection.

Can Qixing customize the 59B?

Qixing can support customized matching from samples, dimensions, drawings and operating data. Non-standard requirements should be confirmed separately.

59B Dimension Table

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