Leak-Proof FC Valve Seat for Petroleum - Thermal Spray Coated by China Suppliers and Factory
Product Description
The FC (Failed Close) automatic shut-off valve seat is a core sealing and vulnerable component of gate valves used in oil drilling, production, oil and gas gathering and transportation, downhole operations, and wellhead systems.
The product employs a professional fail-safe shut-off (FC) design. When sudden conditions occur in oilfield equipment, such as power outages, abnormal system pressure, or actuator malfunctions, the valve seat, in conjunction with the valve structure, automatically and quickly closes, locking the oil and gas medium passage. This fundamentally prevents safety accidents such as blowouts, medium leaks, and equipment malfunctions, strictly adhering to the safety standards for high-risk oilfield operations.
The valve seat uses high-strength alloy structural steel as its base material, precision-machined using CNC lathes and grinders to ensure assembly accuracy. The sealing surface undergoes a high-velocity oxygen fuel spraying (HVOF) tungsten carbide (WC) strengthening process, resulting in a coating with strong adhesion, high hardness, erosion resistance, and corrosion resistance. It can withstand harsh operating conditions such as sandy mud, high-pressure oil and gas, and corrosive media in oilfields for extended periods, significantly improving the sealing stability and service life of the gate valve. It is a core component of valve systems in onshore oilfields and offshore drilling platforms.
The product employs a professional fail-safe shut-off (FC) design. When sudden conditions occur in oilfield equipment, such as power outages, abnormal system pressure, or actuator malfunctions, the valve seat, in conjunction with the valve structure, automatically and quickly closes, locking the oil and gas medium passage. This fundamentally prevents safety accidents such as blowouts, medium leaks, and equipment malfunctions, strictly adhering to the safety standards for high-risk oilfield operations.
The valve seat uses high-strength alloy structural steel as its base material, precision-machined using CNC lathes and grinders to ensure assembly accuracy. The sealing surface undergoes a high-velocity oxygen fuel spraying (HVOF) tungsten carbide (WC) strengthening process, resulting in a coating with strong adhesion, high hardness, erosion resistance, and corrosion resistance. It can withstand harsh operating conditions such as sandy mud, high-pressure oil and gas, and corrosive media in oilfields for extended periods, significantly improving the sealing stability and service life of the gate valve. It is a core component of valve systems in onshore oilfields and offshore drilling platforms.
Product Specifications
| Type | FC Valve Seat |
| 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" (custom sizes available upon request) |
| Working Pressure | 2000psi(2K)/ 3000psi(3K)/ 5000psi(5K)/ 10000psi(10K)/ 15000psi(15K)/ 20000psi(20K) (Customized solutions are available for high-temperature working conditions.) |
| Media | Crude oil, natural gas, drilling mud, sand-containing oil and gas, corrosive oil and gas media |
| Material | High-strength alloy structural steel (42CrMo/40CrNiMo premium grade) |
| 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) |
| Compatible Equipment | Oilfield gate valves, Christmas tree gate valves, drilling high-pressure valves |
| Pressure Rating | Suitable for high-pressure oilfield conditions (custom pressure ratings available) |
| Sealing Performance | Zero leakage under high pressure, suitable for stringent sealing requirements in oilfields |
| Application Areas | Onshore oilfields, offshore drilling platforms, oil and gas gathering and transmission pipelines, downhole equipment |
Product Features
1
Fail-Safety Assurance
Employs FC (Failed Close) automatic shut-off design, quickly closing and locking in case of power failure or equipment malfunction to prevent oil and gas leaks, complying with oilfield safety operation regulations.
2
Ultra-Wear-Resistant and Erosion-Resistant
The sealing surface features a tungsten carbide thermal spray coating with a hardness ≥ HRC75, strongly resisting high-speed erosion from sand-containing media, resulting in a service life far exceeding that of ordinary valve seats.
3
High-Pressure Sealing Stability
Precision-machined sealing surfaces achieve high precision in smoothness and flatness, ensuring zero leakage and no pressure relief under high-pressure conditions, providing long-lasting and reliable sealing performance.
4
Strong Corrosion and Impact Resistance
Double corrosion resistance of the substrate and coating, suitable for harsh conditions such as salt spray, acidic oil and gas, and mud; the high-strength substrate is impact-resistant, non-deformable, and crack-free.
5
Precise and Universal Assembly
Standard structural dimensions perfectly match various oil gate valves, facilitating easy installation, smooth opening and closing without jamming, and requiring no equipment modification.
6
Strong Customization and Adaptability
Supports customization of size, material, coating, and pressure rating to meet the specific needs of different oilfield equipment and operating conditions.
7
Significant Cost Reduction and Efficiency Improvement
Ultra-long service life reduces replacement frequency, lowers equipment downtime and maintenance costs, and improves oilfield operation efficiency.
Product Packaging
Standard Export Packaging Specification
Outer Layer: Fumigation-free plywood box or heavy-duty carton.
Protection: The packaging system is designed to be impact-resistant, moisture barrier, and anti-corrosive, guaranteeing the integrity of the goods during maritime transit.
Product Transportation
Logistics & Delivery
- Maritime Transport
- Land & Rail (Surface Transport)
Frequently Asked Questions
Q
What does "FC" mean in FC Valve Seat, and why is it important for oilfield safety?
"FC" stands for "Failed Close," which means the valve automatically closes and locks when a failure event occurs — such as a power outage, abnormal system pressure, or actuator malfunction. This fail-safe design is critical in oilfield operations because it prevents blowouts, medium leaks, and equipment damage, ensuring personnel safety and environmental protection in high-risk environments.
Q
What surface treatment is applied to the FC Valve Seat sealing surface, and what are its benefits?
The sealing surface is treated using High-Velocity Oxygen Fuel (HVOF) thermal spraying with tungsten carbide (WC)-based coatings, including options such as WC/Co, WC/CoCr, Stellite 20#/NiCr, Cr₃C₂/NiCr, Ni60/Ni55, and WC/Ni. This process produces a coating with hardness ≥ HRC75, strong adhesion (≥70MPa), porosity <1%, and excellent resistance to erosion, corrosion, and impact — significantly extending the valve seat's service life.
Q
What nominal diameters and working pressures are available for the FC Valve Seat?
The FC Valve Seat is available in nominal diameters ranging from 1-13/16" to 13-5/8", including standard sizes such as 2-1/16", 2-9/16", 3-1/16", 4-1/16", 5-1/8", 7-1/16", 9", and 11". Working pressures range from 2,000 psi (2K) to 20,000 psi (20K). Custom sizes and pressure ratings are available upon request to suit specific oilfield equipment requirements.
Q
Is the FC Valve Seat compatible with existing gate valves without equipment modification?
Yes. The FC Valve Seat is manufactured with standard structural dimensions that are designed to precisely match various oilfield gate valves, Christmas tree gate valves, and drilling high-pressure valves. Installation is straightforward, the valve opens and closes smoothly without jamming, and no equipment modification is required in most standard applications.
Q
Can the FC Valve Seat handle corrosive and sand-containing media in oilfield environments?
Absolutely. The valve seat is specifically engineered for harsh oilfield conditions. Its high-strength alloy steel substrate (42CrMo/40CrNiMo) combined with the HVOF tungsten carbide coating provides dual-layer protection against corrosion, erosion from sand-containing media, acidic oil and gas, drilling mud, and salt spray environments. It maintains zero-leakage sealing performance even under prolonged exposure to these aggressive conditions.
Q
What customization options are available, and how are the products packaged for export?
Customization options include nominal diameter, base material, coating type, coating thickness (0.03–0.5mm), and working pressure rating — including solutions for high-temperature operating conditions. For export, products are packed in fumigation-free plywood boxes or heavy-duty cartons, with impact-resistant, moisture-barrier, and anti-corrosive packaging to ensure safe delivery via maritime or land/rail transport.