
Design and manufacturing: GB/T 12237
The structural length:GB/T 12221
Connection forms:JB / T 79.1
Inspection and test:GB / T 26480
Caliber: 1/2″ ~ 48″ (DN15 ~ DN1200)
Pressure temporature level:GB / T 9131
Drive mode:Worm Gear
Pressure: PN1.6 MPa ~ PN42.0 MPa Class 150 ~ Class 2500
A direct buried fully welded gas ball valve is designed for underground natural gas pipelines where long-term sealing reliability and zero maintenance are critical. Featuring a fully welded body with no external flange joints, it eliminates leakage risks and resists soil corrosion, ground movement, and environmental stress. The valve is typically equipped with an extended stem for buried installation, offers excellent shut-off performance, and supports high-pressure gas transmission with minimal pressure loss. Widely used in urban gas networks, transmission pipelines, and buried gas systems, this valve delivers long service life, high safety, and dependable isolation for modern gas infrastructure.
| No. | Name | Material | No. | Name | Material |
|---|---|---|---|---|---|
| 1 | Cap | ASTM A105 | 21 | Thrust bearings | PTFE |
| 2 | Body | ASTM A105 | 22 | Slide bearings | 304 + PTFE |
| 3 | Sphere | ASTM A105 + ENP | 23 | Support seat | ASTM A105 |
| 4 | Anti-static spring | Assembly | 24 | O-ring | VITON |
| 5 | Thrust bearings | PTFE | 25 | O-ring | VITON |
| 6 | Slide bearings | 304 + PTFE | 26 | Y-ring | VITON |
| 7 | Lower stem | ASTM A105 | 27 | Fire pad | SS304 + Graphite |
| 8 | Bottom cover | ASTM A105 | 28 | Filler | Graphite |
| 9 | Drain valve | ASTM A105 + ENP | 29 | Socket head cap screws | ASTM A193 B7 |
| 10 | O-ring | VITON | 30 | Socket head cap screws | ASTM A193 B7 |
| 11 | Fire pad | SS304 + Graphite | 31 | Valve stem | ASTM A182 F6a |
| 12 | Socket head cap screws | ASTM A193 B7 | 32 | Cylindrical pin | 35 |
| 13 | Footsteps | A3 | 33 | Studs | ASTM A193 B7 |
| 14 | Seat | PPL | 34 | Nut | ASTM A194 2H |
| 15 | Seat fire pad | SS304 + Graphite | 35 | Spring washer | 65Mn |
| 16 | Spring support seat | ASTM A105 | 36 | Land | ASTM A105 |
| 17 | Spring | 17-7PH | 37 | Flat key | 45 |
| 18 | O-ring | VITON | 38 | Turbine | ASTM A105-HZn |
| 19 | Seat support ring | ASTM A105 + ENP | 39 | Vent valve | ASTM A105-HZn |
| 20 | Slide bearings | 304 |
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