HVOF Tungsten Carbide Coated Plug Valve - Wear & Corrosion Resistant | China Suppliers & Factory
• Straight-through flow channel — Low flow resistance, suitable for high flow rates.
• Three-way flow channel — Allows for media reversal.
• Four-way flow channel — Suitable for multi-loop media switching.
The inner wall of the flow channel is polished (Ra≤0.8μm) to reduce media erosion and deposition.
🔩 Sealing Surface Structure:
• Conical plug uses a 1:16~1:30 taper design to ensure uniform sealing surface fit.
• Cylindrical plug uses a stepped sealing surface combined with a flexible valve seat to achieve bidirectional sealing.
• Sealing surface is precision ground, with a fit error ≤0.01mm.
🔩 Connection Parts:
The top is equipped with a valve stem connection groove/threaded hole, using key or spline connection to ensure stable torque transmission and prevent slippage. Some high-pressure plugs have a guide shaft at the bottom to improve rotational coaxiality.
| Parameter | Details |
|---|---|
| Type | Plug |
| Compatible Plug Valve Diameters | DN10~DN300 (3/8″~12″) |
| Compatible Nominal Pressures | PN1.6MPa~PN160MPa (Class 150~Class 2500) |
| Compatible Temperature Range | Standard: -40℃~+450℃; Special materials: -196℃~+550℃ |
| Base Material | Carbon steel: 20#, A105, Q235B; Alloy structural steel: 35CrMo, 42CrMo, 25Cr2MoVA; Stainless steel: 304, 316, 316L, 321, duplex steel 2205; Wear-resistant alloys: 2Cr13, 9Cr18, 17-4PH; Special alloys: Hastelloy C276, Monel 400, Inconel |
| Material Hardness Range | Carbon steel: HRC20~30; Alloy structural steel: HRC30~45; Stainless steel: HRC25~35; Wear-resistant alloy: HRC40~50; Special alloy: HRC35~45 |
| Surface Strengthening Processes | Nitriding (gas/ion), thermal spraying of tungsten carbide (WC-Co), Stellite alloy surfacing, nickel-based alloy spraying (Ni60), chrome plating |
| Surface Hardness After Strengthening | Nitriding: HRC50~58; Tungsten carbide spraying: HRC60~65; Stellite surfacing: HRC58~63; Nickel-based spraying: HRC55~60; Chrome plating: HRC45~55 |
| Wear Resistance Improvement Factor | Nitriding: 3~5×; Tungsten carbide spraying: 8~12×; Stellite surfacing: 10~15×; Nickel-based spraying: 5~8×; Chrome plating: 2~3× |
| Precision Machining Parameters | Dimensional tolerances: ≤±0.02mm (GB/T 1804-2000 Precision grade); Coaxiality: ≤0.015mm; Roundness error: ≤0.01mm; Surface roughness: Sealing surface Ra≤0.4μm, inner wall Ra≤0.8μm, non-mating surface Ra≤3.2μm; Taper accuracy (conical plug): ≤±0.005mm/m |
| Sealing Type | Metal hard seal, soft seal composite layer (embedded with PTFE, PFA, rubber) |
| Leakage Rating | Metal hard seal: ANSI B16.104 Class V; Soft seal composite layer: ANSI B16.104 Class VI |
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1Superior Sealing Performance, Adaptable to Diverse Operating Conditions
The precision-ground sealing surface forms a tight fit with the valve seat, and the conical structure achieves a self-tightening seal, ensuring reliable sealing under high-pressure conditions. Supports both hard metal seals and soft seals for flexible selection based on media characteristics. Leakage is significantly lower than industry standards.
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2Wear-Resistant and Erosion-Resistant, Long Service Life
Made of high-strength alloy material combined with advanced surface strengthening processes such as thermal spraying of tungsten carbide and Stellite alloy overlay welding. Surface hardness reaches HRC55~65. Service life is 5~15 times longer than ordinary plug valves, significantly reducing maintenance frequency and replacement costs.
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3High Machining Precision and Smooth, Flexible Operation
Key dimensional tolerances controlled within ±0.02mm, with minimal coaxiality and roundness errors, ensuring precise fit between the plug valve, valve stem, and valve seat. Low friction during rotation eliminates jamming and vibration, allowing easy and precise operation whether manually, electrically, or pneumatically driven.
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4High Interchangeability and Convenient Installation & Maintenance
Designed and manufactured strictly according to international and domestic standards including GB, ANSI, API, and DIN. Dimensions and specifications are fully compatible with original parts. It can directly replace older plug valves of the same model without any modification to the valve body. Disassembly and assembly are simple, requiring only one person to complete the replacement.
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5Optimized Structural Design, Adaptable to Complex Needs
Supports straight-through, tee, and four-way flow path designs for media on/off, reversing, and diversion. Some models feature pressure balancing holes to counteract lateral media pressure on the plug valve, reducing operating torque. The bottom guide shaft design further improves rotational stability and prevents sealing surface misalignment after long-term use.
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6Flexible Material Selection, Outstanding Cost-Effectiveness
Offers a full range of material options including carbon steel, stainless steel, alloy structural steel, and special alloys, allowing precise matching based on media temperature, pressure, and corrosiveness. For low-to-mid-range applications, nitriding and chrome-plated products are available; for high-end harsh applications, tungsten carbide spraying and Stellite welding products are offered, achieving the optimal balance between performance and cost.
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