HVOF Coated FC Gate Valves for Oilfield Use - High-Quality China Supplier & 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
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1. Full Bore Structure
Optimized FC full bore structure with flexible design, ensuring two-way tight sealing and smooth switching.
Optimized FC full bore structure with flexible design, ensuring two-way tight sealing and smooth switching.
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2. API 6A Compliant Forging
Precision forged integral structure complying with API 6A standard, featuring high strength and strong pressure resistance.
Precision forged integral structure complying with API 6A standard, featuring high strength and strong pressure resistance.
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3. HVOF Thermal Spray Coating
Ultra-high hardness (HRC 75), excellent wear, erosion and corrosion resistance for demanding environments.
Ultra-high hardness (HRC 75), excellent wear, erosion and corrosion resistance for demanding environments.
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4. CNC Precision Machining
High-flatness sealing surface, stable sealing performance and extended service life.
High-flatness sealing surface, stable sealing performance and extended service life.
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5. Harsh Environment Adaptability
Strong adaptability to harsh oilfield environments, effectively reducing equipment maintenance frequency.
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
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Ocean Freight
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Overland & Rail Freight
Frequently Asked Questions
Q
What is an FC full bore gate and what is it used for?
The FC full bore gate is a critical sealing component designed exclusively for API 6A standard oilfield gate valves. Its slab-type full bore structure maintains a consistent, unreduced flow passage, making it ideal for pipeline pigging operations and minimizing fluid resistance in wellheads, Christmas trees, and high-pressure manifolds.
Q
What materials are used to manufacture the FC full bore gate?
The gate is precision forged from high-strength alloy steels including AISI 4130, AISI 4140, 316L stainless steel, 2205 Dual-phase Steel, and 2507 Dual-phase Steel — selected based on the specific working environment and media requirements.
Q
What is HVOF coating and why is it applied to the gate's sealing surface?
HVOF (High Velocity Oxygen Fuel) thermal spray coating applies materials such as WC-Co, WC/CoCr, or Ni-based alloys at supersonic speed to the sealing surface. This produces an ultra-hard (HRC 75), dense coating with porosity below 1% and bonding strength ≥70MPa, delivering outstanding wear, erosion, and corrosion resistance under extreme oilfield conditions.
Q
What working pressure and temperature ranges does the FC gate support?
The FC full bore gate supports working pressures from 2,000 PSI (2K) up to 20,000 PSI (20K), and operating temperatures ranging from -46°C to +121°C, fully compliant with API 6A temperature grades K, L, P, and U.
Q
What nominal diameters and coating thicknesses are available?
Available nominal diameters include: 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", and 13-5/8". Coating thickness ranges from 0.03mm to 0.5mm and can be customized to meet specific application requirements.
Q
How is the FC full bore gate packaged and shipped internationally?
Each gate is individually wrapped in an anti-rust protective bag and packed in a fumigation-free plywood box or carton. The packaging is shockproof, damp-proof, and rust-resistant to ensure product integrity during ocean freight and overland or rail transportation.