Leak-Proof FC Valve Seat for Petroleum | China Suppliers & Factory Thermal Spray Coating Solutions
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
1Fail-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.
2Ultra-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.
3High-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.
4Strong 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.
5Precise 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.
6Strong Customization and Adaptability
Supports customization of size, material, coating, and pressure rating to meet the specific needs of different oilfield equipment and operating conditions.
7Significant 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
QWhat does "FC" mean in the FC Valve Seat, and how does the fail-safe mechanism work?
"FC" stands for "Failed Close." The fail-safe mechanism means that when the valve system loses power, experiences abnormal pressure, or suffers actuator failure, the valve seat automatically and immediately closes to lock the oil and gas medium passage. This design prevents blowouts, leaks, and other safety incidents without requiring any manual intervention, making it essential for high-risk oilfield environments.
QWhat surface treatment is applied to the FC Valve Seat, and why is it important?
The sealing surface is treated using High-Velocity Oxygen Fuel (HVOF) thermal spraying with tungsten carbide (WC)-based coatings. This process produces a coating with hardness up to HRC75, bonding strength ≥70MPa, and porosity below 1%. The result is exceptional resistance to erosion from sand-laden media, corrosion from acidic gases, and mechanical impact — all critical for long-term reliability in oilfield conditions.
QWhat sizes and pressure ratings are available for the FC Valve Seat?
The FC Valve Seat is available in nominal diameters ranging from 1-13/16" up to 13-5/8", and working pressures from 2,000 psi (2K) to 20,000 psi (20K). Custom sizes and pressure ratings can be manufactured upon request to meet specific oilfield equipment requirements.
QIs the FC Valve Seat compatible with existing gate valve equipment without modification?
Yes. The FC Valve Seat is manufactured to standard structural dimensions that are compatible with a wide range of oilfield gate valves, Christmas tree gate valves, and drilling high-pressure valves. Installation is straightforward, with smooth operation and no need for equipment modifications.
QWhat are the applicable working environments and media for this valve seat?
The FC Valve Seat is designed for use in onshore oilfields, offshore drilling platforms, oil and gas gathering and transmission pipelines, and downhole equipment. It handles media including crude oil, natural gas, drilling mud, sand-containing oil and gas, and corrosive oil and gas media, within a working temperature range of -46°C to +121°C.
QWhat packaging and shipping options are available for international orders?
Products are shipped in standard export packaging using fumigation-free plywood boxes or heavy-duty cartons, designed to be impact-resistant, moisture-proof, and anti-corrosive to ensure product integrity during transit. Available shipping methods include maritime transport and land & rail (surface transport) to accommodate various international logistics requirements.