Mechanical connections
Companion Flanges
A companion flange is selected to mate with a particular flanged connection. The term describes its role in an assembly, so the actual connection form and dimensions must be identified.
Construction & special designs
Lip-Type Flanges
Lip-type flange enquiries require a drawing of the intended lip and mating arrangement. The name alone does not establish a unique connection, seal system or standard.
Identify whether the lip is a gasket-location feature, a welded sealing element or another design-specific interface. These arrangements are not interchangeable. This page accepts a drawing-led requirement without representing an unverified lip profile as a standard Valtron product.
Compare flange typesEstablish the intended lip design
Provide a section through the assembled joint, the mating component and the seal detail. A photograph can help identify the arrangement, but does not replace the dimensions and material specification.
Review before quotation
Include the design conditions, connection loads, installation method and governing standard or equipment reference. The offered scope and relevant product imagery can be confirmed once the actual design has been identified.
Dimensions and connection data
Define Lip-Type Flanges as part of the complete joint. These fields identify required engineering data; they are not universal dimensions or a declaration of available sizes.
| Parameter / designation | Technical information | Selection requirement |
|---|---|---|
| Nominal size and bore | State the nominal connection size separately from the actual bore or pipe outside diameter. | A matching size label does not establish matching internal geometry. |
| Outside diameter and thickness | Identify the finished flange diameter, minimum thickness and any hub or collar projection. | Include the drawing datum and units for replacement measurements. |
| Bolt circle and holes | Record pitch-circle diameter, hole quantity, hole diameter and any special orientation. | Check against the mating flange; do not infer a bolt pattern from pressure class alone. |
| Gasket-contact surfaces | Specify face form, seating dimensions and surface finish on the assembled joint. | Include gasket designation; a visually similar surface is not evidence of compatibility. |
| Pipe-side interface | Identify weld preparation, socket, thread, collar or other attachment geometry as applicable. | Provide pipe schedule/wall thickness and the connection-specific standard. |
| Design conditions | State design pressure, minimum/maximum temperature, fluid and mechanical loads. | Pressure class is not a pressure value in bar or psi. Use the material-specific rating basis. |
Compare related options
Compare Lip-Type Flanges with the related forms or references below. A related product is not necessarily a permissible substitute.
| Related product / reference | Distinction | Check before selection |
|---|---|---|
| Companion Flanges | A companion flange is selected to mate with a particular flanged connection. The term describes its role in an assembly, so the actual connection form and dimensions must be identified. | Provide equipment drawing or flange designation |
| Square Flanges | A square flange has a square external form and a connection-specific bolt arrangement. The outer shape alone does not identify its bore, seal or pressure rating. | Equipment designation or approved mating drawing |
| Loose Flanges | A loose flange is a separate backing component working with a collar, lapped end or stub end. It transfers bolt load while the companion component forms the pipe-side seating interface. | Collar or stub-end designation and drawing |
Inspection, documents and delivery
Define acceptance requirements for Lip-Type Flanges in the purchase order. Required examinations and documents depend on the material, design and project specification.
| Review stage | Information to confirm | Order requirement |
|---|---|---|
| Material identity and traceability | Specification, grade, heat/lot identification and the required material certificate. | Agree documentation and marking before manufacture; visual appearance cannot verify alloy identity. |
| Dimensional verification | Critical dimensions from the selected standard or controlled drawing. | Identify inspection points, tolerances, units and drawing revision. |
| Surface and end condition | Gasket-contact surface, attachment end, edges and any coating exclusions. | State finish and visual acceptance criteria; agree protection of machined surfaces. |
| Supplementary examinations | Any specified PMI, NDE, hardness, impact, corrosion or other tests. | Define the method, sampling and acceptance criteria; tests are not automatically included. |
| Assembly compatibility | Adjoining components, weld or mechanical interface and project service conditions. | Design approval and correct assembly remain separate from a dimensional inspection report. |
| Packing and order release | Quantity, identification, surface protection, documents and delivery destination. | Agree preservation, packaging and release requirements with the order. |
Specification checklist
Define your lip-type flanges
Availability, dimensions and pressure-temperature suitability are confirmed against your complete enquiry.
| Item | Requirement |
|---|---|
| Design identity | Controlled drawing, revision and equipment reference |
| Lip and mate | Section geometry, mating component and tolerances |
| Seal or weld | Sealing principle, material and assembly requirements |
| Service | Pressure, temperature, fluid compatibility and inspection scope |
| Material & quantity | Exact material designation, quantity and required certification or inspection documents |
Application context
Where this form is considered
- Drawing-defined lip interfaces
- Replacement enquiries with an existing joint section
- Equipment-specific sealing arrangements
Related connections
Compare other flange forms
Construction & special designs
Square Flanges
A square flange has a square external form and a connection-specific bolt arrangement. The outer shape alone does not identify its bore, seal or pressure rating.
Mechanical connections
Loose Flanges
A loose flange is a separate backing component working with a collar, lapped end or stub end. It transfers bolt load while the companion component forms the pipe-side seating interface.