We manufacture more than a thousand specifications of over ten series of products, including safety valves, power station valves, steam extraction check valves, gate valves, globe valves, check valves, hard-sealed ball valves, all-welded ball valves, ball valves, butterfly valves, and other models and specifications.
DN300
Hard-sealed ball valve
Sealing surface hardening methods: supersonic spraying of tungsten carbide, chromium carbide, spray welding of nickel-based alloys, cladding of cobalt-based alloys, etc.;
Operating devices: handle, worm gear box, electric, pneumatic, hydraulic, pneumatic-hydraulic, electro-hydraulic.
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Technical Parameters of Hard Seal Ball Valves
Design Standards: API6D, API608, GB／T21385, etc.;
Inspection Standards: API598, ASME B16.104, JB／T9092;
Flange Connection: ASME B16.5, HG, GB, etc.;
Structural Length: ASME B16.10, GB／T12221, etc.;
Pressure Rating: 150Lb～2500Lb（1.6MPa～42.0MPa）;
Nominal Diameter Range: NPS1／2～24（DN15～DN600）;
Applicable Temperature: -29℃～540℃;
Main Body Material: Carbon steel, Austenitic stainless steel, Duplex stainless steel, etc.;
Sealing Surface Hardening Method: Ultrasonic spraying of tungsten carbide, chromium carbide, nickel-based alloy spraying, cobalt-based alloy cladding, etc.;
Operating Device: Handwheel, worm gear box, electric, pneumatic, hydraulic, pneumatic-hydraulic, electro-hydraulic.
Coating Material
The coating material must be wear-resistant, corrosion-resistant, erosion-resistant, have high binding force, low porosity and low friction coefficient. The properties of different base materials must also be considered.
Serial Number | Spraying Material | Coating Hardness | Coating Thickness | Spraying Method | Operating Temperature | Base Material |
1 | Cr-Ni-Si-B | 57-63(HRC) | 400-600um | Thermal Spraying | <650°C | SS、F51 |
2 | Cr-Ni-WC-Co | 60-65(HRC) | 400-600um | Thermal Spraying | <650°C | SS、F51 |
3 | W-C-Co | 68-74(HRC) | 150-250um | Ultrasonic Spraying | <450°C | Cr13、SS、F51 |
4 | W-C-Co-Cr | 68-72(HRC) | 150-250um | Ultrasonic Spraying | <470°C | Cr13、SS、F51 |
5 | Cr-C-Ni-Cr | 53-57(HRC) | 150-250um | Ultrasonic Spraying | <850°C | Cr13、SS、F51 |
6 | W-Cr-Co-N | 50-55(HRC) | 150-250um | Ultrasonic Spraying | <650°C | Cr13、SS、F51 |
After hardening treatment of the sealing surface, wear resistance, erosion resistance and corrosion resistance can be obtained. Various hardening treatment methods can be selected according to different working conditions.
• HVOF supersonic spraying: Supersonic flame powder spraying of tungsten carbide and chromium carbide, etc. The hardened coating has low porosity, a binding force greater than 70 MPa, a hardness of up to HRC80, and a hardened layer thickness of 150～250 μm.
• High-temperature spraying: Oxyacetylene flame spraying of alloy powder. The sprayed layer is once spray-melted or the sprayed layer is secondary re-melted using a combustion flame, so that the sprayed layer and the base material are in a metallurgical bonding state. The binding force can reach 400 MPa, the hardness can reach HRC65, and the hardened layer thickness is 400～600 μm, and can reach 1.5 mm thick.
• Cladding: The sealing surface is clad with a cobalt-based alloy, with a hardness of up to HRC44, and a cladding layer thickness ≥2mm.
• Whole sintered tungsten carbide: The sealing element is made of alloy powder sintered at high temperature and ground. It has low porosity, a hardness of up to HRA90, and high hardness and wear resistance.
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Connecting flanges conform to JB/T 79 standard.
Connecting flanges are in accordance with JB/T79 standard.