Labyrinth Seals

Labyrinth Seals Manufacturer for Industrial Rotating Equipment

ZB Bearings manufactures labyrinth seals for industrial rotating equipment, including Babbitt-lined seals in standard product configurations and custom designs. Established in 2007, we specialize in bearing-related components and support drawing-based manufacturing, sample reproduction, and replacement parts. Dimensions, backing materials, Babbitt lining specifications, and critical features are reviewed against the equipment requirements before production.

Φ80 Babbitt-lined Seal
The Φ80 Babbitt-lined Seal features a metal backing body, a tin-based Babbitt alloy lining, and an annular structure with multiple circumferential grooves. Designed for equipment-specific sealing...
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Φ150 Babbitt-lined Seal
The Φ150 Babbitt-lined Seal is a cylindrical sealing component with a metal backing body and a tin-based Babbitt alloy lining. The nominal inner diameter is 150 mm. Other dimensions and interfaces...
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Φ200 Babbitt-lined Seal
The Φ200 Babbitt-lined Seal is a metal-backed sealing component with a tin-based Babbitt alloy lining. Its cylindrical construction combines a metal supporting structure with an alloy-lined inner...
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Φ300 Babbitt-lined Seal
The Φ300 Babbitt-lined Seal is a replacement component for equipment requiring a 300 mm Babbitt-lined sealing assembly. It supports maintenance and OEM procurement where the original seal...
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Babbitt-lined Steps Seal
The Babbitt-lined Steps Seal is designed for sealing assemblies with stepped mating interfaces. Its stepped profile defines the fit with adjacent components, while the Babbitt lining provides the...
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Thick Babbitt-lined Seal
The Thick Babbitt-lined Seal features a metal backing and a thick Babbitt alloy layer designed for specialized sealing interfaces in rotating equipment. Its construction supports applications...
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Labyrinth Seal Selection Guide

Equipment and Dimensions

Identify the equipment type, seal location, shaft arrangement, and housing configuration. Provide the shaft diameter, housing dimensions, overall seal dimensions, and critical radial or axial clearances. Drawings or measured samples are preferred for replacement applications.

Replacement and Project Information

Provide the existing part number, equipment model, original drawing, or dimensional sketch. Photographs and worn components can support the assessment when complete drawings are unavailable.

Operating Conditions

Specify rotational speed, operating temperature, pressure differential, process medium, and expected shaft movement or thermal expansion where applicable.

Materials and Sealing Requirements

Identify the backing material, Babbitt alloy grade, required lining thickness, and sealing profile. Include any specified tolerances, surface finish requirements, or project standards.

Product Range

Product	Product Characteristics	Key Information for Quotation
Φ80 Babbitt-lined Seal	Babbitt-lined labyrinth seal identified by the nominal Φ80 designation.	Confirm the dimensional reference, overall dimensions, backing material, and lining requirements.
Φ150 Babbitt-lined Seal	Babbitt-lined seal for equipment requiring the Φ150 size designation.	Provide the equipment drawing or dimensional details to verify the shaft and housing interfaces.
Φ200 Babbitt-lined Seal	Babbitt-lined seal in the Φ200 size category, with final geometry determined by the specified design.	Confirm the complete dimensions, sealing profile, and required operating clearances.
Φ300 Babbitt-lined Seal	Babbitt-lined seal for applications requiring the Φ300 size designation.	Submit the assembly drawing or interface dimensions to establish installation compatibility.
Babbitt-lined Steps Seal	Features a stepped sealing profile with a Babbitt-lined working surface.	Specify the step geometry, critical dimensions, lining requirements, and mating component details.
Thick Babbitt-lined Seal	Features a thicker Babbitt lining configuration for designs requiring a specified lining allowance.	Confirm the required lining thickness, finished dimensions, backing material, and machining allowance.

Applications & Equipment Fit

Power generation:

Steam turbines, gas turbines, generators and associated rotating equipment. Review shaft geometry, speed, thermal movement and installation constraints.

Oil and gas / petrochemical:

Compressors, turbo-expanders and process equipment. Confirm process medium, temperature, pressure conditions and applicable project specifications.

Mining and heavy industry:

Gearboxes, conveyor-related equipment and other rotating machinery. Consider dust exposure, contamination control and the actual seal location.

Water and wastewater:

Industrial pumps, aerators and blowers. Check shaft and housing dimensions, operating speed and exposure to moisture or process fluids.

Design Types & Sealing Mechanisms

Labyrinth seals restrict leakage through a series of clearances and changes in flow direction without relying on continuous contact between the rotating and stationary components.

The final design should be confirmed against the equipment drawing, operating conditions, installation constraints, and required sealing performance.

Straight Labyrinth:

Uses a relatively direct sequence of sealing teeth and clearances. The configuration can be considered where the equipment geometry and available sealing space permit.

Stepped Labyrinth:

Uses changes in passage geometry to create a more tortuous leakage path. Step dimensions and clearances depend on the equipment design.

Knife-Edge / Throttling Profiles:

Use narrow clearances at the sealing teeth to restrict fluid passage. Tooth geometry and operating clearance require consideration of speed, temperature and shaft movement.

Split / Interlocking Designs:

Split construction can facilitate installation or replacement where removing the rotor or shaft is impractical. Joint geometry and assembly alignment must be confirmed for the specific equipment.

Custom Manufacturing & Engineering Support

Custom Manufacturing
Labyrinth seals can be assessed for drawing-based manufacturing and replacement applications. Customization is defined by the component drawing, equipment interfaces, material requirements, and agreed acceptance criteria.

Customization Item	Manufacturing Scope
Seal dimensions	Overall dimensions and critical features defined by the approved drawing or measured sample.
Shaft and housing interfaces	Mating dimensions and installation features matched to the equipment arrangement.
Sealing profile	Straight, stepped, or other profiles confirmed as suitable for the specific design.
Backing and lining materials	Metal backing and Babbitt alloy specifications confirmed for the application.
Surface finish and tolerances	Machining and dimensional requirements defined by the drawing.
Replacement components	Assessment of worn, obsolete, or discontinued parts using available drawings or samples.
Order quantity	Prototype, small-batch, or production quantities subject to manufacturing review.

Engineering Review
Drawing and Sample Assessment

Review the supplied drawing, part number, revision, or physical sample to identify the required geometry, interfaces, materials, tolerances, and any missing technical information.

Dimensional and Clearance Verification
Check critical dimensions and evaluate operating clearances against the equipment arrangement, rotational speed, temperature, and expected shaft movement where relevant.

Manufacturing Drawing Approval
Resolve technical discrepancies and confirm the manufacturing drawing, material specifications, critical tolerances, and acceptance criteria before production.

Any deviation from the approved drawing requires written approval before implementation.

Materials & Manufacturing Process

Materials
Babbitt-lined labyrinth seals combine a metal backing with a Babbitt alloy lining. Material selection depends on the component design, operating conditions, and specified mechanical and dimensional requirements.

Material Category	Options and Considerations
Babbitt lining	Tin-based Babbitt alloy; specify the alloy grade and required lining thickness where applicable.
Metal backing	Steel and bronze are options for applicable configurations. Other backing materials require confirmation for the specific design.
Custom material combinations	Reviewed against the drawing, operating environment, and manufacturing feasibility.

Manufacturing Process
Substrate Preparation
Prepare the metal backing surface for the specified lining process and component geometry.

Babbitt Lining
Apply the specified Babbitt alloy using the confirmed process. Centrifugal casting is applicable to selected Babbitt-lined components.

Precision Machining
Machine the component to achieve the specified sealing profile, interfaces, and finished dimensions.

Surface Finishing
Finish critical surfaces and sealing features to meet the approved drawing requirements.

Final Verification
Inspect critical dimensions, surface condition, and agreed material or lining requirements against the approved drawing and acceptance criteria.

Quality Inspection & Documentation

Dimensional inspection:

Verify overall dimensions, mounting interfaces, critical profiles, and specified tolerances.

Critical-feature measurement:

Use CMM inspection for applicable geometries when suitable equipment and inspection methods are available.

Material verification:

Check material identification and specified lining requirements against the agreed material specifications.

Drawing conformity:

Evaluate inspection results against the approved manufacturing drawing and agreed acceptance criteria.

Quality Certification & Inspection Documents:

ISO 9001:2015 quality management certification. Available documents include dimensional inspection reports, material test reports (MTRs), and other agreed quality records, subject to project requirements.

FAQ

Q: What information is required to request a quotation?

A: Provide the product name or part number, available drawing or sample information, required quantity, and target delivery date. Material specifications and operating conditions should also be included when available.

Q: How is the delivery lead time determined?

A: Lead time depends on material availability, component complexity, order quantity, machining requirements, and inspection scope. The confirmed schedule is stated in the quotation or order confirmation.

Q: Can you manufacture under our part number and drawing revision?

A: Yes. Provide the customer part number and required drawing revision with the inquiry. The applicable revision must be confirmed before manufacturing approval.

Q: Can you support third-party inspection before shipment?

A: Third-party inspection can be arranged by prior agreement. Confirm the inspection agency, scope, acceptance criteria, inspection stage, and associated costs before production.

Q: Can you accommodate export packaging and customer shipping marks?

A: Export packaging and shipping marks can be specified during order confirmation. Provide the required labels, package identification, handling instructions, and project-specific documentation requirements in advance.

Q: How are drawing changes handled after approval?

A: Submit changes in writing. Their impact on dimensions, materials, production status, inspection requirements, and delivery schedule must be reviewed and approved before implementation.

We are one of the most professional labyrinth seals manufacturers and suppliers in China. With abundant experience, we warmly welcome you to buy customized labyrinth seals at competitive price from our factory. If you have any enquiry about free sample, please feel free to email us.