HVOF Tungsten Carbide Coated Plug – Wear & Corrosion Resistant

Product Description

The plug (also known as the valve core or plug body) is the core functional component of a plug valve. As a key component for valve opening, closing, and sealing, it directly determines the plug valve's sealing performance, operational flexibility, and service life. Its structure is a single, precision-machined unit. The main types are conical plugs (suitable for medium and high-pressure conditions, achieving self-sealing through conical surface contact) and cylindrical plugs (suitable for large-diameter, frequent operation conditions, offering superior sealing stability). A straight-through, three-way, or four-way flow channel is located in the center, forming a tight seal with the valve seat inside the valve body. During operation, the plug rotates 90° via the torque transmitted by the valve stem (some adjustable types can achieve 360° fine-tuning). When the flow channel is fully aligned with the valve body passage, the medium flows freely; when the flow channel is completely misaligned with the valve body passage, the tight fit between the plug sealing surface and the valve seat blocks the flow of the medium, thus achieving on/off control or throttling regulation. 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.

Core Structural Details: Flow Channel Design: 
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.

Product Specifications

Product Features

1. Superior Sealing Performance, Adaptable to Diverse Operating Conditions: 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.

2. Wear-Resistant and Erosion-Resistant, Long Service Life: 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. 3. High machining precision and smooth, flexible operation: 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.

4. High interchangeability and convenient installation and maintenance: 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. As an independent, easily damaged part, disassembly and assembly are simple, requiring only one person to complete the replacement, significantly reducing equipment downtime for maintenance. 

5. Optimized Structural Design, Adaptable to Complex Needs: 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. 

6. Flexible Material Selection, Outstanding Cost-Effectiveness: 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, avoiding cost waste caused by over-selection; 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.

Product Packaging

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.

Product Transportation

Shipping Methods
● Ocean Transportation
● Overland & Rail Services