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China Suppliers Factory Underground Fully Welded Steel Ball Valve for Pipeline Systems and Oil Transportation
Product Details
With a fully welded forged steel body structure, the valve offers exceptional strength, long service life, and zero-leakage performance. Its design allows the valve to be directly buried underground without constructing a valve chamber, significantly reducing installation costs and construction time.
Structure Characteristics
Underground buried fully welded ball valve structure characteristics:
- The pressure parts and control parts are forged, and the parts are of higher quality.
- Automatic welding assembly is adopted between each section of the ball valve body to make the valve body stronger, safe and reliable without leakage.
- Directly buried welding ball valve can be directly buried in the ground, without the need to build a valve well; the operating mechanism and discharge port, grease port are led to the ground — does not affect operation and maintenance, and can greatly save construction costs and time.
- Welding connection is adopted for ball valve and pipeline, which is safe and reliable and eliminates the risk of leakage of flange connection.
- Trunnion mounted ball valve, piston seat — flexible operation, reliable sealing.
- Anti-static function, and comply with API 607 fire protection requirements.
- Fully welded ball valve with grease injection auxiliary sealing device.
Valve Design Optional
End Connections
RF, RTJ as per B16.5 & B16.47
BW, Butt Welded as per B16.25
Body Design
Forged welded two-piece and three-piece
Seat Design
Soft or metal seated with hard facing on Ball and Seats
Self relieving seats
Double piston seats
Structure
Double block and bleed design (DBB)
Secondary seals in pure Graphite
Anti-static device
Anti-blowout stem
Emergency sealant injection on seats and stem available
Low fugitive emission stem packing available
CRA overlay on all dynamic sealing areas or on all wetted parts available
Stem extension for underground installations
Operator
Manual: Wrench or gear with padlocking
Actuated: Pneumatic / Hydraulic / Electric
Specification
Underground Fully Welded Steel Ball Valve — Engineering Drawing
Dimensions
| Size | L (mm) | D (mm) | D1 (mm) | D2 (mm) |
|---|---|---|---|---|
| DN50 | 300 | 50 | 60.3 | 114 |
| DN65 | 300 | 65 | 76.1 | 140 |
| DN80 | 300 | 80 | 88.9 | 165 |
| DN100 | 325 | 100 | 114.3 | 216 |
| DN125 | 350 | 125 | 141.3 | 219 |
| DN150 | 490 | 150 | 168.3 | 355 |
| DN200 | 580 | 200 | 219.1 | 356 |
| DN250 | 550 | 250 | 273.1 | 457 |
| DN300 | 630 | 300 | 323.9 | 508 |
| DN350 | 762 | 337 | 355.6 | 559 |
| DN400 | 840 | 387 | 406.4 | 660 |
| DN500 | 1010 | 489 | 508 | 812 |
| DN600 | 1140 | 591 | 609 | 1016 |
| DN700 | 1346 | 686 | 711.2 | 1095 |
| DN800 | 1524 | 781 | 812.8 | 1237 |
| DN900 | 1727 | 874 | 914.4 | 1385 |
Frequently Asked Questions
Q
What is an underground fully welded ball valve and how does it differ from a standard ball valve?
An underground fully welded ball valve features a forged steel body with all sections joined by automatic welding, creating a leak-free, permanent structure. Unlike standard flanged ball valves, it can be directly buried underground without a valve chamber, which dramatically reduces civil construction costs and installation time.
Q
Does the valve require a valve well or pit for underground installation?
No. One of the key advantages of this valve is that it can be directly buried in the ground without constructing a valve well. The operating mechanism, discharge port, and grease injection port are all extended to ground level, allowing for easy operation and maintenance without excavation.
Q
What connection types are available for this fully welded ball valve?
The valve supports multiple end connections, including RF (Raised Face) and RTJ (Ring Type Joint) flanges per ASME B16.5 & B16.47, as well as Butt Weld (BW) connections per B16.25. Welded connections are preferred for buried installations as they eliminate flange leakage risks.
Q
What sizes are available and what is the maximum size offered?
The underground fully welded ball valve is available in sizes ranging from DN50 (2 inch) up to DN900 (36 inch), covering a wide range of pipeline applications. Custom sizes outside this range may also be available upon request — please contact us for specific requirements.
Q
Does the valve comply with fire-safe and anti-static standards?
Yes. The valve is designed with a built-in anti-static device and fully complies with API 607 fire-safe requirements. It also features an anti-blowout stem and secondary seals in pure graphite for enhanced safety under emergency conditions.
Q
What actuator options are available for this ball valve?
The valve can be operated manually using a wrench or gear operator with padlocking capability. For automated applications, it is compatible with pneumatic, hydraulic, and electric actuators, making it suitable for both manual and remote-control pipeline systems.
Product Packaging
01020304