HVOF Coated FC Gate Valves for Oilfield Applications - High-Strength Steel from China Suppliers and Factory
Product Description
FC full bore gate is a critical sealing component exclusively designed for API 6A standard oilfield gate valves. Adopting a slab-type full bore structure, it features a consistent flow passage with no diameter reduction, perfectly matching full bore valve cavities to enable unobstructed pipeline pigging and minimal fluid resistance.
Forged integrally from high-strength alloy steel (AISI 4130/4140) or stainless steel, the gate boasts a compact, defect-free structure with exceptional mechanical strength and high pressure resistance (up to 20,000PSI). Its double-sided sealing surfaces are enhanced with HVOF thermal spray coating (WC-Co, Ni-based WC, Co-Cr-W alloy), delivering ultra-high hardness (HRC 75), superior wear resistance, erosion resistance and corrosion resistance.
Processed by CNC precision machining, the sealing surfaces feature ultra-high flatness and finish, ensuring reliable two-way metal hard sealing without leakage under harsh working conditions. Compliant with API 6A temperature grades (K/L/P/U) and performance levels (PR1/PR2), it offers excellent interchangeability, long service life and strong adaptability to onshore/offshore oilfield wellheads, Christmas trees and high-pressure manifolds.
Product Specifications
| Type | FC Full Bore Gate |
| Nominal Diameter | 1-13/16"/ 2-1/16"/ 2-9/16"/ 3-1/16"/ 3-1/8"/ 4-1/16"/ 5-1/8"/ 6-5/8"/ 7-1/16"/ 9"/ 11"/ 13-5/8" |
| Working Pressure | 2000psi(2K)/ 3000psi(3K)/ 5000psi(5K)/ 10000psi(10K)/ 15000psi(15K)/ 20000psi(20K) |
| Media | Crude oil/ Natural gas/ Oilfield wastewater/ Mud/ Water/ Oil-gas mixtures |
| Material | AISI 4130/ AISI 4140/ 316L/ 2205 Dual-phase Steel/ 2507 Dual-phase Steel |
| Working Temperature | -46℃ - +121℃ |
| Hardness | HRC75 |
| Bonding Strength | ≥70MPa |
| Porosity | ＜1% |
| Surface Treatment | Supersonic spraying of cobalt-bonded tungsten carbide (WC/Co) / cobalt-chromium-bonded tungsten carbide (WC/CoCr) / cobalt-chromium tungsten alloy (Stellite 20#/NiCr) / nickel-chromium-bonded chromium carbide (Cr₃C₂/NiCr) / nickel-based alloy (Ni60/Ni55) / nickel-based tungsten carbide (WC/Ni) |
| Coating Thickness | 0.03–0.5mm (Customizable) |
Product Features
⚙
Optimized FC full bore structure with flexible design, ensuring two-way tight sealing and smooth switching.
🛡
Precision forged integral structure complying with API 6A standard, featuring high strength and strong pressure resistance.
🔥
HVOF thermal spray coating with ultra-high hardness, excellent wear, erosion and corrosion resistance.
🎯
CNC precision machined sealing surface with high flatness, stable sealing performance and long service life.
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Strong adaptability to harsh oilfield environments, effectively reducing equipment maintenance frequency.
Product Packaging
📦 Standard Export Packaging
- Inner: Anti-rust protective bag
- Outer: Fumigation-free plywood box or carton
- Shockproof, damp-proof and rust-resistant, guaranteeing safe sea transportation.
Product Transportation
🚚 Logistics & Transportation
- Ocean Freight
- Overland & Rail Freight
Frequently Asked Questions
Q What is an FC full bore gate and how does it differ from a reduced bore gate?
An FC full bore gate features a flow passage with the same diameter as the pipeline, allowing for unobstructed pigging operations and minimal pressure drop. Unlike reduced bore gates, there is no diameter reduction through the valve, making it ideal for applications requiring pipeline cleaning tools to pass through freely.
Q What working pressure ratings are available for the FC full bore gate?
The FC full bore gate is available in six pressure ratings: 2,000 psi (2K), 3,000 psi (3K), 5,000 psi (5K), 10,000 psi (10K), 15,000 psi (15K), and 20,000 psi (20K), covering a wide range of oilfield wellhead and high-pressure manifold applications.
Q What materials are used in the manufacture of the FC full bore gate?
The gate body is precision forged from high-strength alloy steel (AISI 4130 or AISI 4140) or stainless steel grades including 316L, 2205 Dual-phase Steel, and 2507 Dual-phase Steel. The choice of material depends on the specific corrosion, pressure, and temperature requirements of the application.
Q What is HVOF thermal spray coating and why is it applied to the sealing surfaces?
HVOF (High Velocity Oxygen Fuel) thermal spray coating is a supersonic spraying process that deposits wear-resistant materials such as WC-Co, WC/CoCr, or Stellite alloys onto the sealing surfaces. This results in ultra-high hardness (HRC 75), porosity below 1%, and bonding strength ≥70 MPa, providing outstanding resistance to wear, erosion, and corrosion under harsh oilfield conditions.
Q Which API 6A temperature grades and performance levels does the FC full bore gate comply with?
The FC full bore gate complies with API 6A temperature grades K, L, P, and U, covering operating temperatures from -46°C to +121°C. It also meets API 6A performance levels PR1 and PR2, ensuring suitability for both standard and high-integrity oilfield service environments.
Q What packaging is used to ensure the FC full bore gate arrives safely during international shipping?
Each gate is packed using standard export packaging: an inner anti-rust protective bag to prevent corrosion, and an outer fumigation-free plywood box or carton for structural protection. The packaging is shockproof, damp-proof, and rust-resistant, ensuring product integrity throughout sea transportation and long-distance logistics.