Dismantling & Telescopic Joints
VSSJAF (C2F) Double Flange Dismantling Joint
A double-flanged dismantling joint designed for controlled installation adjustment, easy removal of valves and pumps, and transmission of axial pipeline thrust in flanged piping systems.
In international piping markets, this product category is also commonly described as a double flanged dismantling joint, flanged dismantling joint or flange restrained dismantling joint. VSSJAF (C2F) is the Mingchao model designation.
- Model
- VSSJAF (C2F)
- Product Type
- Double Flange Dismantling Joint
- Size Range
- DN65–DN3200
- Connection
- Double Flanged
- Standard
- GB/T 12465-2007
- Adjustment Length
- 40 / 50 / 60 / 80 mm depending on size
- Pressure Options
- 0.6 MPa / 1.0 MPa
- Main Body Materials
- QT450-10 / Q235A
- Gasket Options
- NBR / EPDM / CR
- Function
- Installation Adjustment / Easy Dismantling / Force Transmission
Stock / Fast ShipmentMany common sizes and configurations are kept in stock for faster shipment.
CustomizationFlange drilling and dimensional configurations available on request
Project Configuration
Mingchao can customize the product configuration based on the technical information, operating conditions and dimensional data you provide. Final configuration can be reviewed and manufactured to the approved project drawing.
VSSJAF (C2F) Double Flange Dismantling Joint Overview
The VSSJAF (C2F) is a double flange dismantling joint designed to simplify the installation, removal and maintenance of flanged valves, pumps and other pipeline equipment. Its adjustable telescopic structure provides controlled installation tolerance while the bolted restraint arrangement transmits axial pipeline thrust through the connected assembly.
The C2F configuration combines double-flanged connection, sealing components, an adjustable short-pipe section and through studs in one restrained joint. This allows installers to adjust the effective installation length before the assembly is locked in position, helping reduce the need to cut or modify adjacent pipework during equipment installation or maintenance.
Mingchao supplies the VSSJAF (C2F) for water supply, drainage, wastewater treatment, municipal and industrial piping systems. Standard catalog sizes extend from DN65 to DN3200, with flange drilling and dimensional configurations available according to confirmed project requirements.
Technical Specifications & Adjustment Range
VSSJAF (C2F) installation length, adjustment range and flange dimensions vary by nominal diameter and pressure option. The complete Mingchao catalog data is shown below.
| DN | Pipe OD Dw | L | ΔL | 0.6 MPa D | 0.6 MPa D1 | 0.6 MPa n-Th. | 0.6 MPa b | 1.0 MPa D | 1.0 MPa D1 | 1.0 MPa n-Th. | 1.0 MPa b |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 65 | 76 | 200 | 40 | 160 | 130 | 4-M12 | 16 | 185 | 145 | 4-M16 | 20 |
| 80 | 89 | 200 | 40 | 190 | 150 | 4-M16 | 18 | 200 | 160 | 8-M16 | 22 |
| 100 | 114 | 200 | 40 | 210 | 170 | 4-M16 | 18 | 220 | 180 | 8-M16 | 24 |
| 125 | 140 | 200 | 40 | 240 | 200 | 8-M16 | 20 | 250 | 210 | 8-M16 | 26 |
| 150 | 168 | 200 | 40 | 265 | 225 | 8-M16 | 20 | 285 | 240 | 8-M20 | 26 |
| 200 | 219 | 200 | 40 | 320 | 280 | 8-M16 | 22 | 340 | 295 | 8-M20 | 28 |
| 250 | 273 | 200 | 40 | 375 | 335 | 12-M16 | 24 | 395 | 350 | 12-M20 | 28 |
| 300 | 325 | 200 | 40 | 440 | 395 | 12-M20 | 24 | 445 | 400 | 12-M20 | 28 |
| 350 | 377 | 220 | 50 | 490 | 445 | 12-M20 | 26 | 505 | 460 | 16-M20 | 30 |
| 400 | 426 | 220 | 50 | 540 | 495 | 16-M20 | 28 | 565 | 515 | 16-M24 | 32 |
| 450 | 480 | 220 | 50 | 595 | 550 | 16-M20 | 28 | 615 | 565 | 20-M24 | 32 |
| 500 | 530 | 220 | 50 | 645 | 600 | 20-M20 | 30 | 670 | 620 | 20-M24 | 34 |
| 600 | 630 | 240 | 50 | 755 | 705 | 20-M24 | 30 | 780 | 725 | 20-M27 | 36 |
| 700 | 720 | 240 | 50 | 860 | 810 | 24-M24 | 32 | 895 | 840 | 24-M27 | 40 |
| 800 | 820 | 350 | 60 | 975 | 920 | 24-M27 | 34 | 1015 | 950 | 24-M30 | 44 |
| 900 | 920 | 350 | 60 | 1075 | 1020 | 24-M27 | 36 | 1115 | 1050 | 28-M30 | 46 |
| 1000 | 1020 | 350 | 60 | 1175 | 1120 | 28-M27 | 36 | 1230 | 1160 | 28-M33 | 50 |
| 1200 | 1220 | 370 | 60 | 1405 | 1340 | 32-M30 | 40 | 1455 | 1380 | 32-M36 | 56 |
| 1400 | 1420 | 370 | 60 | 1630 | 1560 | 36-M33 | 44 | 1675 | 1590 | 36-M39 | 62 |
| 1600 | 1620 | 380 | 60 | 1830 | 1760 | 40-M33 | 48 | 1915 | 1820 | 40-M45 | 68 |
| 1800 | 1820 | 380 | 60 | 2045 | 1970 | 44-M36 | 50 | 2115 | 2020 | 44-M45 | 70 |
| 2000 | 2020 | 400 | 60 | 2265 | 2180 | 48-M39 | 54 | 2325 | 2230 | 48-M45 | 74 |
| 2200 | 2220 | 400 | 60 | 2475 | 2390 | 52-M39 | 60 | 2550 | 2440 | 52-M52 | 80 |
| 2400 | 2420 | 400 | 60 | 2685 | 2600 | 56-M39 | 62 | 2760 | 2650 | 56-M52 | 82 |
| 2600 | 2620 | 450 | 80 | 2905 | 2810 | 60-M45 | 64 | 2960 | 2850 | 60-M52 | 88 |
| 2800 | 2820 | 450 | 80 | 3115 | 3020 | 64-M45 | 68 | 3180 | 3070 | 64-M52 | 94 |
| 3000 | 3020 | 450 | 80 | 3315 | 3220 | 68-M45 | 70 | 3405 | 3290 | 68-M56 | 100 |
| 3200 | 3220 | 450 | 80 | 3525 | 3430 | 72-M45 | 76 |
Dimensions are in millimetres. Blank cells reproduce values not listed in the Mingchao catalog; confirm the required DN, pressure option, installation length and mating flange data before ordering.
Dimensions, Pressure Options & Flange Connections
The VSSJAF (C2F) is installed between flanged pipeline components and provides controlled longitudinal adjustment before final tightening. Installation length, adjustment range and flange dimensions vary by nominal diameter and pressure option.
The current Mingchao catalog provides 0.6 MPa and 1.0 MPa configurations for this C2F series. Flange drilling and dimensional requirements should be confirmed against the connected valve, pump, meter or pipeline equipment before production.
Custom flange drilling and project-specific dimensions can be reviewed against customer drawings or connection requirements.
Materials & Construction
The VSSJAF (C2F) uses a restrained double-flange structure consisting of the main body, sealing gasket, follower, limited short pipe, studs and nuts. Material combinations should be selected according to the pipeline medium, project specification and operating conditions.
| Component | Mingchao Catalog Material |
|---|---|
| Body | QT450-10 / Q235A |
| Gasket | NBR / EPDM / CR |
| Follower | QT450-10 / Q235A |
| Limited Short Pipe | Q235A |
| Stud | Q235A / 35# |
| Nut | Q235A / 20# |
Applications for Valves, Pumps, Waterworks & Industrial Piping
Valve Installation & Maintenance
Provides adjustable installation space for flanged valves and helps simplify valve removal, maintenance and replacement.
Pump Connections & Pump Stations
Supports installation adjustment and maintenance access around pumps and connected flanged piping.
Water Supply & Municipal Pipelines
Suitable for water-distribution and municipal pipeline systems requiring adjustable, restrained flanged connections.
Wastewater & Sewage Treatment
Used in wastewater and drainage systems around valves, pumps and process piping where equipment access is required.
Industrial Piping Systems
Provides installation adjustment and axial force transmission in industrial flanged piping assemblies.
Fire Protection / Utility Systems
Suitable for fire-protection and utility piping systems when the specified dimensions, pressure option and connection requirements are confirmed.
How to Select a C2F Double Flange Dismantling Joint
Selection should be based on the connected equipment, nominal diameter, installation length, required adjustment, pressure option, flange dimensions and pipeline operating conditions.
- Nominal diameter — DN
- Connected equipment — valve / pump / meter / piping
- Required installation length
- Required adjustment ΔL
- Pressure option
- Flange drilling / mating flange dimensions
- Pipeline medium
- Main material requirement, if specified
- Quantity
- Project drawing or connection drawing, if available
Confirm the required C2F configuration and connection data before production.
C2F vs. B2F vs. CC2F Pipeline Joints
| Product Type | Configuration |
|---|---|
| VSSJAF (C2F) Double Flange Dismantling Joint | Easy dismantling, installation adjustment and axial force transmission in double-flanged equipment connections. |
| VSSJA-2 (B2F) Double Flange Restrained Telescopic Joint | Double-flange restrained telescopic and installation-adjustment configuration. |
| VSSJAFC (CC2F) Detachable Double Flange Dismantling Joint | Detachable double-flange dismantling configuration where the detachable structure is specifically required. |
Installation & Maintenance Guidelines
Confirm the C2F dimensions, mating flanges, adjustment requirement and connected equipment before installation.
Confirm mating flange dimensions before installation.
Verify the DN, pressure option, flange drilling and connected equipment dimensions.
Set the required installation length within the specified adjustment range.
Use the catalog L and ΔL values for the selected nominal diameter.
Complete alignment before locking the joint in position.
Align the connected flanges and equipment before final restraint.
Tighten the bolted restraint assembly evenly.
Complete tightening according to the applicable project installation procedure.
Maintain equipment access.
Allow sufficient access around valves, pumps or equipment for future dismantling and maintenance.
Real VSSJAF (C2F) Product & Application Photos
Technical Documents / Reference Information
- VSSJAF (C2F) Technical Dimension Data
- GB/T 12465-2007 Reference
- Project-specific flange / dimensional data available for review
- Product drawings where approved and available