HVOF Tungsten Carbide Coated Plug Valves - Durable & Corrosion-Resistant Solutions from China Suppliers and Factory
This accessory is widely used in plug valve assemblies in industries such as petrochemicals, natural gas transportation, food and pharmaceuticals, metallurgy and mining, and mud manifolds. It is a core wear-resistant component for handling high-pressure, particulate, and corrosive media conditions.
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: The conical plug uses a 1:16~1:30 taper design to ensure uniform sealing surface fit; the cylindrical plug uses a stepped sealing surface, combined with a flexible valve seat to achieve bidirectional sealing; the 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.
| 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 times; Tungsten carbide spraying: 8~12 times; Stellite surfacing: 10~15 times; Nickel-based spraying: 5~8 times; Chrome plating: 2~3 times |
| 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 of flow channel 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 |
The precision-ground sealing surface forms a tight fit with the valve seat, and the conical structure design achieves a self-tightening seal, ensuring more reliable sealing performance under high-pressure conditions. It supports both hard metal seals and soft seals, allowing for flexible selection based on media characteristics (corrosion, particles, temperature) to meet the sealing needs of different industries. Leakage is significantly lower than industry standards.
The main body is made of high-strength alloy material, combined with advanced surface strengthening processes such as thermal spraying of tungsten carbide and Stellite alloy overlay welding. The surface hardness reaches HRC55~65, effectively resisting the erosion, wear, and chemical corrosion of particulate media. Service life is 5~15 times longer than ordinary plug valves, significantly reducing valve maintenance frequency and replacement costs.
Following strict precision machining processes, key dimensional tolerances are 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 for easy and precise opening, closing, and adjustment whether operated manually, electrically, or pneumatically.
Designed and manufactured strictly according to international and domestic standards such as GB, ANSI, API, and DIN, with dimensions and specifications fully compatible with original parts. It can directly replace older plug valves of the same model, both domestically and internationally, without any modification to the valve body. Disassembly and assembly are simple, requiring only one person to complete the replacement, significantly reducing equipment downtime for maintenance.
Supports various flow path designs such as straight-through, tee, and four-way, meeting different functional requirements such as media on/off, reversing, and diversion. Some models are equipped with pressure balancing holes (dedicated to high-pressure plug valves), which can counteract the lateral pressure of the media on the plug valve, reduce operating torque, and adapt to high-pressure, large-diameter plug valves. The bottom guide shaft design further improves rotational stability and prevents sealing surface misalignment after long-term use.
Offers a full range of material options including carbon steel, stainless steel, alloy structural steel, and special alloys, allowing for precise matching based on parameters such as media temperature, pressure, and corrosiveness. For low-to-mid-range applications, nitriding and chrome-plated products are available, while for high-end, harsh applications, tungsten carbide spraying and Stellite welding products are available, achieving the optimal balance between performance and cost.
Standard Export Packaging
📦 Inner: Rust-proof protective wrapping
📦 Outer: Fumigation-free plywood case or export carton
Engineered for shock resistance, moisture protection and corrosion prevention, ensuring secure delivery via ocean transportation.
Shipping Methods
- Ocean Transportation
- Overland & Rail Services