Dismantling & Telescopic Joints
VSSJA-1 (BF) Single Flange Limited Telescopic Joint
The VSSJA-1 (BF) is a single flange limited telescopic joint for controlled pipeline installation adjustment, with one flanged connection and an opposite pipe-end/sleeve connection.
Also searched as a single flange limited expansion joint, single flange telescopic joint or single flange restrained telescopic joint.
- Model
- VSSJA-1 (BF)
- Product Type
- Single Flange Limited Telescopic Joint
- Size Range
- DN65–DN3600
- Connection
- Single flange + opposite pipe-end / sleeve connection
- Function
- Installation adjustment with limiting / restraint structure
- Standard
- Factory confirmation required
CustomizationDimensions, interfaces, materials and coating can be reviewed against the operating conditions and approved project drawing.
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.
VSSJA-1 (BF) Single Flange Limited Telescopic Joint Overview
The Mingchao VSSJA-1 (BF) is a single-flange limited telescopic joint for piping arrangements that require a flanged connection on one side and a pipe-end/sleeve connection on the other. The telescopic section provides controlled installation adjustment before the selected configuration is secured.
The body, gasket and follower form the adjustable sealing assembly. The limited short pipe and long- and short-stud arrangement control the permitted telescopic configuration. Final selection depends on the actual pipe outside diameter, installation geometry, interface dimensions and engineering requirements.
How the BF Configuration Works
The pipe-end side enters the body and sleeve assembly, while the opposite side connects through a single flange. The follower compresses the gasket around the adjustable interface. After the required installation position is established, the limited short pipe and stud arrangement control the available axial configuration.
The published ΔL values describe the documented adjustment geometry. Final operating conditions, restraint requirements and installation details must be reviewed for the project.
Materials & Construction
Material selection should be confirmed against the medium, operating conditions and approved project drawing.
| Component | Material |
|---|---|
| Body / 本体 | QT450-10 / Q235A |
| Gasket / 密封圈 | NBR / EPDM / CR |
| Follower / 压盖 | QT450-10 / Q235A |
| Limited short pipe / 限位短管 | Q235A |
| Nut / 螺母 | Q235A / 20# |
| Long stud / 长螺栓 | Q235A / 35# |
| Short stud / 短螺栓 | Q235A / 35# |
Main Connection Dimensions
The table lists 34 configurations from DN65 to DN3600. Repeated DN entries represent different pipe outside diameters and remain separate. Dimensions are in millimetres unless stated otherwise.
| DN | Pipe OD Dw (mm) | D0 (mm) | L (mm) | L1 (mm) | ΔL (mm) | Connection Dimensions — 0.6 MPa: D (mm) | 0.6 MPa: D1 (mm) | 0.6 MPa: n-Ød0 | Connection Dimensions — 1.0 MPa: D (mm) | 1.0 MPa: D1 (mm) | 1.0 MPa: n-Ød0 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 65 | 76 | 76 | 340 | 105 | 50 | 160 | 130 | 4-φ14 | 185 | 145 | 4-φ18 |
| 80 | 89 | 89 | 340 | 105 | 50 | 190 | 150 | 4-φ18 | 200 | 160 | 8-φ18 |
| 100 | 108 | 108 | 340 | 105 | 50 | 210 | 170 | 4-φ18 | 220 | 180 | 8-φ18 |
| 100 | 114 | 114 | 340 | 105 | 50 | 210 | 170 | 4-φ18 | 220 | 180 | 8-φ18 |
| 125 | 133 | 133 | 340 | 105 | 50 | 240 | 200 | 8-φ18 | 250 | 210 | 8-φ18 |
| 125 | 140 | 140 | 340 | 105 | 50 | 240 | 200 | 8-φ18 | 250 | 210 | 8-φ18 |
| 150 | 159 | 159 | 340 | 105 | 50 | 265 | 225 | 8-φ18 | 285 | 240 | 8-φ22 |
| 150 | 168 | 168 | 340 | 105 | 50 | 265 | 225 | 8-φ18 | 285 | 240 | 8-φ22 |
| 200 | 219 | 219 | 340 | 105 | 50 | 320 | 280 | 8-φ18 | 340 | 295 | 8-φ22 |
| 250 | 273 | 273 | 340 | 105 | 50 | 375 | 335 | 12-φ18 | 395 | 350 | 12-φ22 |
| 300 | 325 | 325 | 350 | 130 | 65 | 440 | 395 | 12-φ22 | 445 | 400 | 12-φ22 |
| 350 | 377 | 377 | 350 | 130 | 65 | 490 | 445 | 12-φ22 | 505 | 460 | 16-φ22 |
| 400 | 426 | 426 | 350 | 130 | 65 | 540 | 495 | 16-φ22 | 565 | 515 | 16-φ26 |
| 450 | 480 | 480 | 350 | 130 | 65 | 595 | 550 | 16-φ22 | 615 | 565 | 20-φ26 |
| 500 | 530 | 530 | 350 | 130 | 65 | 645 | 600 | 20-φ22 | 670 | 620 | 20-φ26 |
| 600 | 630 | 630 | 350 | 130 | 65 | 755 | 705 | 20-φ26 | 780 | 725 | 20-φ30 |
| 700 | 720 | 720 | 350 | 130 | 65 | 860 | 810 | 24-φ26 | 895 | 840 | 20-φ30 |
| 800 | 820 | 820 | 590 | 220 | 130 | 975 | 920 | 24-φ30 | 1015 | 950 | 24-φ30 |
| 900 | 920 | 920 | 590 | 220 | 130 | 1075 | 1020 | 24-φ30 | 1115 | 1050 | 24-φ33 |
| 1000 | 1020 | 1020 | 590 | 220 | 130 | 1175 | 1120 | 28-φ30 | 1230 | 1160 | 28-φ33 |
| 1200 | 1220 | 1220 | 590 | 220 | 130 | 1405 | 1340 | 32-φ33 | 1455 | 1380 | 28-φ36 |
| 1400 | 1420 | 1428 | 590 | 220 | 130 | 1630 | 1560 | 36-φ36 | 1675 | 1590 | 32-φ40 |
| 1500 | 1520 | 1528 | 590 | 220 | 130 | 1730 | 1660 | 36-φ42 | |||
| 1600 | 1620 | 1628 | 590 | 220 | 130 | 1830 | 1760 | 40-φ36 | 1915 | 1820 | |
| 1800 | 1820 | 1828 | 590 | 220 | 130 | 2045 | 1970 | 44-φ40 | 2115 | 2020 | 40-φ48 |
| 2000 | 2020 | 2030 | 590 | 220 | 130 | 2265 | 2180 | 48-φ42 | 2325 | 2230 | 44-φ48 |
| 2200 | 2220 | 2230 | 590 | 220 | 130 | 2475 | 2390 | 52-φ42 | 2550 | 2440 | 48-φ48 |
| 2400 | 2420 | 2430 | 590 | 220 | 130 | 2685 | 2600 | 56-φ42 | 2760 | 2650 | 52-φ56 |
| 2600 | 2620 | 2630 | 600 | 240 | 150 | 2905 | 2810 | 60-φ48 | 2960 | 2850 | 56-φ56 |
| 2800 | 2820 | 2830 | 600 | 240 | 150 | 3115 | 3020 | 64-φ48 | 3180 | 3070 | 60-φ56 |
| 3000 | 3020 | 3030 | 600 | 240 | 150 | 3315 | 3220 | 68-φ48 | 3405 | 3290 | 64-φ56 |
| 3200 | 3220 | 3230 | 600 | 240 | 150 | 3525 | 3430 | 72-φ48 | 68-φ60 | ||
| 3400 | 3420 | 3430 | 600 | 240 | 150 | 3735 | 3640 | 76-φ48 | |||
| 3600 | 3620 | 3630 | 600 | 240 | 150 | 3970 | 3860 | 80-φ56 |
Blank cells reflect configurations for which no value is listed. Confirm pipe OD, installation length, flange dimensions, drilling and operating conditions before ordering.
BF vs. B2F / CF Selection Guidance
| Product Type | Configuration |
|---|---|
| VSSJA-1 (BF) | Single flange; limited telescopic configuration for installation adjustment. |
| VSSJA-2 (B2F) | Double flange; restrained or limited telescopic configuration. |
| VSSJAFG (CF) | Single flange; force-transmission and dismantling configuration. |
| VSSJAF (C2F) | Double flange; force-transmission and dismantling configuration. |
| VSSJAFC (CC2F) | Detachable double-flange force-transmission and dismantling configuration. |
Applications
Water Transmission
Installation adjustment in water-pipeline connections where the BF interface matches the project layout.
Water Treatment
Valve, pump and equipment interfaces subject to confirmed project conditions.
Pump & Valve Connections
Controlled installation adjustment around connected equipment.
Utility Pipelines
Single-flange connection arrangements for utility and infrastructure piping.
Industrial Piping
Project-specific installation interfaces after materials and operating conditions are reviewed.
Suitability depends on the confirmed medium, pressure requirement, temperature, external loads, installation geometry and material compatibility.
Customization / Project Data
Mingchao can review DN and pipe OD, face-to-face length, installation geometry, flange and interface dimensions, flange drilling, body and gasket materials, stud materials, coating and connection geometry against the customer’s CAD, PDF or project drawing.
Final dimensions and materials are manufactured according to the approved project drawing.
Engineering Notes
- Working pressure: Factory confirmation required.
- Test pressure: Factory confirmation required.
- Temperature range: Factory confirmation required.
- Applicable standard: Factory confirmation required.
- Movement or load requirements beyond the listed ΔL values: Engineering calculation on request.
- Certifications: Factory confirmation required.
Product Images, Drawing & Connection Dimensions
Information Required for Selection & Quotation
Provide the available project information so the BF configuration can be reviewed.
- Model / required configuration
- DN
- Pipe outside diameter
- Required face-to-face or installation length
- Installation geometry
- Pressure requirement
- Medium
- Material requirements
- Flange / interface standard
- Project CAD, PDF or drawing
- Quantity and project location
Mingchao will confirm which inputs are required for the specific quotation.