A DO type floating seal is a heavy-duty mechanical face seal that helps retain lubricant and keep abrasive contaminants out of rotating equipment. It typically uses two precision-finished metal seal rings, each supported by an elastomeric toric ring in a separate housing. The metal faces meet under axial load to form the sealing interface, while the toric rings provide secondary sealing and help accommodate movement between the components.
At ZHONO, we help buyers assess DO type floating seals by looking at the equipment, installation space, operating conditions, and required materials—not just the seal’s nominal size. These seals are commonly considered for applications such as track rollers, idlers, final drives, and other equipment exposed to dirt, mud, or abrasive wear. The right specification depends on the machine design and service conditions.
A typical DO assembly contains two matched metal seal rings and two elastomeric toric rings. Each metal ring sits in a housing and is supported by a toric ring, which also seals the interface between the ring and housing. When the two housings are assembled, the metal faces contact one another and create the primary seal.
The term “floating” refers to the seal arrangement’s ability to accommodate limited movement while maintaining contact at the sealing faces. The toric rings help position the metal rings and provide a degree of flexibility as components move in service. This does not mean the assembly can compensate for unlimited misalignment, incorrect installation, or unsuitable operating conditions.
The contacting metal faces help retain lubricant inside the equipment and restrict dirt, water, and other contaminants from entering. This makes the design useful in locations where conventional lip seals may face exposure to abrasive material or challenging environmental conditions. Actual performance depends on factors such as surface condition, housing geometry, lubrication, installation, and the machine’s operating environment.
DO type floating seals are used in many forms of heavy equipment and industrial machinery. Examples include track rollers, idlers, undercarriage components, final drives, gearboxes, and other rotating assemblies where a compact, robust sealing arrangement is required. The seal must be matched to the specific equipment; a similar-looking assembly is not necessarily interchangeable.
Application conditions matter as much as the equipment category. Buyers should consider rotational speed, temperature, pressure conditions, lubricant type, contamination, vibration, and expected movement at the sealing interface. When these conditions are unknown, we recommend collecting operating information or consulting the equipment manufacturer before finalizing a seal selection.
The metal rings provide the primary sealing faces and must be specified to suit the equipment and working environment. Ring geometry, dimensions, surface finish, and material are relevant selection details. Buyers should verify these against the original part information or an engineering drawing rather than selecting on outside diameter alone.
Toric rings are typically made from elastomer materials selected for compatibility with the lubricant, temperature range, and surrounding environment. Different elastomers can behave differently in oil, water, heat, and chemical exposure. Confirm the required material with the equipment documentation or supplier, especially when replacing an existing seal with a different lubricant or operating temperature.
There is no single material combination that fits every DO type application. ZHONO can review the available drawing, equipment details, or sample information to discuss a suitable ring and toric-ring configuration. Final suitability should be confirmed against the application requirements and any relevant equipment specifications.
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Before requesting a quotation, assemble the information that identifies both the seal and its working conditions. The following table outlines useful details to provide. Not every project will have every value immediately available, but missing operating information should be identified rather than assumed.
| Specification | What to provide | Why it matters |
|---|---|---|
| Dimensions | Seal ring dimensions, housing or cavity details, and drawing revisions | Confirms fit and helps prevent ordering a similar but incompatible assembly. |
| Operating conditions | Rotational speed in rpm, temperature in °C, and pressure or pressure differential in kPa | Helps assess whether the proposed seal configuration suits the service environment. |
| Lubricant and exposure | Lubricant type, water exposure, and expected dust or abrasive contamination | Supports material selection and application review. |
| Part identification | OEM or existing part number, equipment model, sample, or technical drawing | Provides a reference for checking the requested replacement. |
For clarity, operating values such as 1,200 rpm, 80 °C, or 20 kPa can be used as examples of the units to report, but they are not recommended operating limits or ratings for a DO type floating seal. Provide the actual values for your machine, and ask the supplier to confirm whether the proposed configuration is suitable. If a value varies during operation, share the expected range and how it was measured.
Use an OEM part number, an approved drawing, or carefully recorded measurements as the starting point. Confirm the seal cavity and housing geometry, not just the visible dimensions of the old assembly. If the original seal has been damaged or worn, measurements from it may not represent its original specification.
Check that the metal ring and toric-ring materials are appropriate for the lubricant, temperature, and contamination exposure. Also confirm whether the application involves unusual pressure, frequent starts and stops, or movement that may affect the sealing interface. These details help the supplier assess the request and flag information that needs engineering confirmation.
Even a correctly specified seal can be compromised by incorrect handling or installation. Keep the sealing faces clean, avoid damaging them, and follow the equipment manufacturer’s assembly instructions for positioning and compression. Do not mix parts from different seal sets unless compatibility has been confirmed, as the components may not form a matched assembly.
A useful supplier review goes beyond price. We recommend sending ZHONO the part number, equipment model, drawing or sample details, target quantity, and operating conditions. This gives our team a basis to check the requested configuration, clarify missing information, and discuss material or dimensional questions before an order is placed.
For replacement programs, buyers can also specify packaging, identification, inspection documentation, and delivery requirements in the inquiry. If the application is a new design, include the available cavity dimensions and operating envelope so that the proposal can be reviewed against the intended use. We do not treat a general product description as proof that a seal will fit or meet every application requirement.
A DO type floating seal is a mechanical face seal built around two contacting metal rings supported by elastomeric toric rings. It is commonly used where rotating equipment needs lubricant retention and protection from contaminants, including demanding mobile and industrial applications. Whether it is right for a specific machine depends on verified dimensions, materials, operating conditions, and correct installation.
To take the next step, prepare your equipment model or part number, drawing or cavity measurements, lubricant details, and actual operating values. Send these details to ZHONO for a quotation and configuration review. Where the information is incomplete, we can identify what needs confirmation before you proceed with sourcing.
For more information, please visit DO Type Floating Seal.