Introduction to flange type and sealing surface form
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| Flanges | Standard | Sealing surface | Class grade PN，MPa |
Common valve supporting flange | ||
| Type | Code | form | Code | |||
| Plate flange | PL | HG20593、 JB/T81-94、 GB/T9119-2000 |
Raised face | RF | 0.25～2.5 | RF flat welding flange is a commonly used flange, which can be used with various flanged low and medium pressure valves |
| Flat face | FF | 0.25～1.6 | ||||
| Slip on falange | SO | HG20594、 GB/T9116-2000 |
Raised face | RF | 0.6～4.0 | RF Slip on falange is a structural type commonly used in petrochemical plants introduced in recent years |
| Male and female face | MFM | 1.0～4.0 | ||||
| Tongue and groove face | TG | 1.0～4.0 | ||||
| Flat face | FF | 0.6～1.6 | ||||
| Weld neck flange | WN | HG20595、 JB/T82-94、 GH/T9115-2000 |
Raised face | RF | 1.0～25.0 | PN4.0-PN10.0MPa valves are usually equipped with convex pipe flanges, such as: Z41H-40, J41H-64, H44H-100, etc. Ring pressure face above 160 pressure, such as J41H-160 Raised face butt welding method Lan can also be used with butterfly valve and check valve with wafer connection. |
| Male and female face | MFM | 1.0～16.0 | ||||
| Tongue and groove face | TG | 1.0～16.0 | ||||
| Ring joint face | RJ | 6.3～25.0 | ||||
| Flat face | FF | 1.0～1.6 | ||||
| Integral flange | IF | HG20596、 JB/T79-94、 GB/T9113-2000 |
Raised face | RF | 0.6～25.0 | The overall flange on the valve is generally RF with PN ≤ 2.5, concave surface with PN ≥ 4.0, and RJ face with PN ≥ 16.0, but there are also manufacturers of PN10.0 who use RJ face PN16.0MPa with concave PN2.5MPa ammonia valve FM pipe flange with RF surface |
| Male and female face | MFM | 1.0～16.0 | ||||
| Tongue and groove face | TG | 1.0～16.0 | ||||
| Ring joint face | RJ | 0.6～25.0 | ||||
| Flat face | FF | 1.0～1.6 | ||||
| Socket weld flange | SW | HG20597、 GB/T9114-2000 |
Raised face | RF | 1.0～10.0 | Structures commonly used in petroleum artificial devices introduced in recent years. |
| Male and female face | MFM | 1.0～10.0 | ||||
| Tongue and groove face | TG | 1.0～10.0 | ||||
| Threaded flanges | Th | HG20598、 GB/T9114-2000 |
Raised face | RF | 0.6～4.0 | It is more commonly used in engineering construction, and is easy to install without welding. It is suitable for DN10-DN150. |
| Flat face | FF | 0.6～1.6 | ||||
| Lap jiont flange | PJ/SE | HG20599、 JB/T84-94、 GB/T9120-2000 |
Raised face | RF | 0.6～4.0 | Piping systems for corrosive media. |
| weld-on Lap jiont flange | PJ/RJ | HG20600、 JB/T83-94、 GB/T9121-2000 |
Raised face | RF | 0.6～1.6 | |
| Male and female face | MFM | 1.0～1.6 | ||||
| Tongue and groove face | TG | 1.0～1.6 | ||||
| Blind flange | BL | HG20601、 JB/T84-94、 GB/T9123-2000 |
Raised face | RF | 0.25～25.0 | For pipe ends or as heads |
| Male and female face | MFM | 1.0～16.0 | ||||
| Tongue and groove face | TG | 1.0～16.0 | ||||
| Ring joint face | RJ | 6.3～25.0 | ||||
| Flat face | FF | 0.25～1.6 | ||||
| Lined Blind flange | BL（S） | HG20602 | Raised face | RF | 0.6～4.0 | Prepared to save precious metals such as stainless steel |
| Male face | M | 1.0～4.0 | ||||
| Tongue face | T | 1.0～4.0 | ||||
| ASME Slip on falange | SO | HG20616 American Standard | Raised face | RF | 2.0～26.0 | PN2.5-5.0 American standard valve matching |
| ASME weld neck falange | WN | HG20617 American Standard | Raised face | RF | 2.0～42.0 | Generally, RF is used for PN≤11.0MPa, RJ face is used for PN≥15.0MPa. |
| Ring joint face | RJ | 2.0～11.0 | ||||