Custom Forged Steel Valve Bonnets for High-Pressure Wellhead Equipment
Product Description
Yile Machinery specializes in the manufacture of custom forged steel valve bonnets for critical applications in the oil and gas industry. As a key pressure-containing component in gate valves, choke valves, and wellhead Christmas trees, our forged bonnets provide superior strength, durability, and reliability required for demanding high-pressure, high-temperature (HPHT) service.
We supply fully machined and tested bonnets manufactured to your exact engineering drawings and industry standards like API 6A.
The Forging Advantage for Critical Applications
For pressure control equipment, forging is the superior manufacturing method. Unlike casting or machining from bar stock, our closed-die forging process aligns the steel's internal grain structure to the shape of the bonnet. This results in:
Enhanced Mechanical Strength: Forged components possess exceptional tensile strength and impact toughness, crucial for containing extreme pressures.
Superior Fatigue Resistance: The uninterrupted grain flow eliminates internal defects and weak points, providing a longer service life under cyclic loading.
Guaranteed Pressure Integrity: The dense, non-porous structure of a forging ensures it is free from voids that could lead to leaks or catastrophic failure.
Materials & Compliance with Industry Standards
We forge bonnets from a range of high-strength alloy steels specified for oilfield use. Our process includes controlled heat treatment (Quenching & Tempering) to achieve the precise mechanical properties required by your design.
Common Material Grade | Key Characteristics & Use |
AISI 4130 | The industry standard for wellhead equipment. A chromium-molybdenum alloy steel with a great balance of strength, toughness, and weldability. |
AISI 4140 | A higher carbon version of 4130, offering increased hardness and strength after heat treatment. |
ASTM A182 F22 | A chromium-moly alloy steel with excellent high-temperature strength and resistance to hydrogen attack. |
Other Alloys | We can also forge other carbon, alloy, and stainless steel grades upon request. |
All our products can be manufactured in compliance with API 6A (Wellhead and Christmas Tree Equipment) and NACE MR0175 (for sour service environments) .
Integrated Manufacturing: From Forging to Finished Part
We offer a complete, single-source solution for your component needs:
Closed-Die Forging: Creating the near-net shape with optimal grain flow.
Heat Treatment: Normalizing, Quenching & Tempering (Q&T) to achieve specified hardness and strength.
Precision CNC Machining: Machining all critical dimensions, sealing surfaces, and bolt holes to tight tolerances.
Quality Control & Testing: We perform rigorous quality checks, including:
Dimensional Inspection (CMM)
Hardness Testing
Non-Destructive Testing (NDT), including Magnetic Particle (MT) and Ultrasonic (UT) inspection.
Applications
Our forged bonnets are essential components for a wide range of oilfield pressure control equipment:
API 6A Gate Valves
Choke Valves
Frac Valves
Wellhead Christmas Trees
Blowout Preventers (BOPs)
Get a Quote for Custom Forged Components
Contact our engineering team to discuss your project. Please provide your engineering drawings, material specifications, heat treatment requirements, and testing criteria for a comprehensive quotation.