GB Forged Flanged Gate Valve
Strictly engineered to meet GB/T 12234 and GB/T 12224 standards, this GB forged flanged gate valve is optimized for high-pressure environments and frequent isolation cycles. The high-tonnage precision forged body ensures a dense, uniform grain structure that eliminates casting-related defects such as shrinkage or porosity, providing superior tensile strength and impact resistance under extreme operational stress. Featuring an OS&Y (Outside Screw and Yoke) design and a Bolted Bonnet configuration, the valve effectively isolates the drive threads from corrosive process media while utilizing multi-layer flexible graphite packing to maintain stringent low-fugitive emission control. The precision-ground hard-alloy sealing surfaces combined with a full-bore flow path ensure bubble-tight shut-off performance while significantly minimizing turbulence and pressure drop, making it a premier solution for reliable fluid control and long-term isolation in oil, chemical, and power industries.
Pressure Rating:1.0 – 42.0 MPa
Size Range: 1/2″ – 60″ (DN 15 – DN 1500)
Working Temperature: -29°C to 266°C
Standards: GB
Materials: Carbon Steel, Stainless Steel, Alloy Steel, Special Alloys
Operation: Manual, Gear, Electric, Pneumatic
Structural Characteristics of
The body is precision-forged from high-quality A105N steel, creating a dense and uniform internal structure that eliminates sand holes and porosity common in castings. This high-reliability shell provides a superior safety margin against transient shocks in municipal heating systems or high-pressure water networks.
The Outside Screw and Yoke (OS&Y) design positions the drive threads outside the fluid environment, preventing thread damage from media erosion. Additionally, the rising stem serves as a visual position indicator, allowing personnel in petrochemical storage areas to accurately verify valve status from a distance.
Equipped with a precision-ground flexible wedge, the valve compensates for seat deformation caused by temperature fluctuations. In environments with significant thermal changes, such as industrial boiler rooms or heat exchange stations, this structure ensures bubble-tight shut-off and prevents cross-flow.
Strictly following GB/T national standards, the flange dimensions are precision-engineered to ensure a perfect fit with domestic pipeline systems. This standardized design facilitates modular installation in factory retrofit projects, eliminating complex site alignments and shortening construction periods.
The stuffing box utilizes a combination of flexible graphite and braided rings, paired with a self-lubricating stem to significantly reduce operating torque. When handling light oils or compressed air, this system effectively suppresses leaks, meeting modern industrial standards for environmental protection and occupational health.
Class 150-600LB Main Connection Dimensions
| Specification (NPS) | Class | End Type | 1/4 | 3/8 | 1/2 | 3/4 | 1 | 1 1/4 | 1 1/2 | 2 | 2 1/2 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Face to face (mm) | CL150 | L (RF) | – | – | 108 | 117 | 127 | 140 | 165 | 178 | 190 |
| CL300 | L1 (BW) | – | – | 140 | 152 | 165 | 178 | 190 | 216 | 241 | |
| CL600 | – | – | 165 | 190 | 216 | 229 | 241 | 292 | 330 | ||
| Handwheel diameter (mm) | W | – | – | 100 | 100 | 125 | 160 | 160 | 180 | 200 | |
| Height (mm) | CL150 / CL300 | – | – | 176 | 184 | 217 | 226 | 250 | 290 | 357 | |
| CL600 | – | – | 161 | 163 | 196 | 226 | 250 | 290 | 357 | ||
| Flow port dimension (mm) | d | – | – | 10 | 13.5 | 18 | 24 | 29 | 36.5 | 45 | |
| Weight (kg) | CL150 | RF | – | – | 3.4 | 3.98 | 6.12 | 7.2 | 10.4 | 15.5 | 24.5 |
| CL150 | BW | – | – | 2.8 | 3.3 | 5.4 | 6.5 | 8.2 | 12.5 | 20 | |
| CL300 | RF | – | – | 3.77 | 4.89 | 7.23 | 9.6 | 12.64 | 18 | 26.2 | |
| CL300 | BW | – | – | 3.5 | 4.4 | 6.8 | 8.1 | 9.2 | 15.4 | 22 | |
| CL600 | RF | – | – | 4.2 | 5.8 | 8.8 | 12.1 | 15.6 | 19.5 | 32 | |
| CL600 | BW | – | – | 4.5 | 5.1 | 8.2 | 10.5 | 12.4 | 20.1 | 28 | |
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