Flange faces are precision-machined sealing surfaces on forged steel valve bodies that ensure leak-proof connections with mating flanges in industrial piping systems.
| Parameter | Typical range | Notes & selection driver |
|---|---|---|
| Face Type | Raised Face (RF), Flat Face (FF), Ring-Type Joint (RTJ) | |
| Surface Finish | 125-250 μin Ra (3.2-6.3 μm Ra) | |
| Pressure Rating | Class 150 to Class 2500 | |
| Temperature Range | -29°C to 538°C depending on material | |
| Flatness Tolerance | 0.05 mm per 300 mm diameter | |
| Raised Face Height | 1.6 mm for Class 150-300, 6.4 mm for Class 600-2500 | |
| Bolt Circle Diameter | ASME B16.5 compliant |
Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.
This component is used in the following industrial products
A forged steel valve body is the primary pressure-retaining component in industrial valve assemblies, manufactured through hot forging processes for superior structural integrity.
The main structural enclosure that contains and supports the internal components of an isolation valve or damper.
The main structural housing of a regulating valve that contains and supports internal flow control components.
A practical evidence checklist for RFQ preparation and supplier evaluation.
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Manufacturer profiles associated with Flange Faces.
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Raised Face (RF) has a raised ring on the sealing surface that concentrates compression force on a smaller area, creating higher sealing pressure. Flat Face (FF) has a completely flat surface that distributes force across the entire flange area. RF is standard for most applications, while FF is used with cast iron flanges or when full-face gaskets are required.
Flange faces should be inspected during routine maintenance shutdowns (typically annually) or whenever the valve is disassembled. Regular visual inspection for scratches, corrosion, or deformation is recommended. Re-machining may be required if surface finish exceeds 500 μin Ra or if flatness deviation exceeds 0.1 mm.
Minor scratches and corrosion can often be repaired by light machining or lapping. Deep damage may require weld repair followed by precision machining. However, excessive repair can reduce flange thickness below minimum specifications, requiring flange replacement according to ASME standards.
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