Zhejiang Jigong Valve Co., Ltd. is one of the most reliable manufacturers and suppliers of high temperature valve balls in China. If you're going to wholesale cheap high temperature valve balls made in China, welcome to get pricelist from our factory. All customized products are with high quality and low price.
Basic Introduction
The high-temperature resistant valve ball is made of high-temperature alloy steel, chromium-molybdenum steel, or high-temperature nickel-based alloy as the base material, combined with a metal hard seal structure and a special high-temperature stabilization heat treatment process. It maintains stable mechanical properties and sealing precision in sustained high-temperature environments, effectively resisting high-temperature oxidation, thermal fatigue, high-temperature creep, and erosion by high-speed high-temperature media. The product spherical surface is precisely ground and processed with cemented carbide or high-temperature alloy sealing pairs, maintaining a low leakage rate and stable operating torque even under high-temperature conditions. It has excellent high-temperature adaptability, and is not easily deformed or jammed during long-term thermal cycle alternating operations. It is especially suitable for power plant boilers, high-temperature steam pipelines, heat treatment equipment, and high-temperature chemical processes where strict heat resistance requirements are required for fluid control conditions.
Product Specification
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Indicator items |
Technical specifications |
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Size range |
1/2" to 48" (supports non-standard customization) |
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Pressure rating |
PN16-PN320(Class150-2500) |
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Spherical material |
Chrome-molybdenum steel, F91, 310S austenitic stainless steel, high-temperature nickel-based alloys, etc |
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Manufacturing process |
Forging + high-temperature stabilized heat treatment + precision machining + sealing surface hardening treatment + fine grinding |
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Coaxiality |
≤0.05mm |
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Roundness accuracy |
≤0.02mm |
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Surface roughness |
Ra ≤ 0.4 μm (sealing surface) |
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Outer diameter tolerance |
1/2" – 4": +0.03 mm |
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Inner diameter tolerance |
1/2" – 4": 0~+0.03 mm |
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Applicable temperature |
Room temperature up to 1200°C (depending on substrate and sealing surface material) |
Product Features
- The matrix is made of high-temperature resistant alloy steel, chromium-molybdenum steel, or high-temperature nickel-based alloy, maintaining excellent creep and relaxation resistance under sustained high-temperature environments
- Through high-temperature stabilized heat treatment, residual stress is eliminated, the microstructure is stabilized, and dimensional accuracy is well maintained under high-temperature conditions
- Combined with a metal hard seal structure design, the sealing pressure is stable at high temperatures, leakage levels are controllable, and there is no concern about aging or failure of soft sealing materials
- The spherical surface is high-precision grinding and combined with a special lubricating coating (optional), allowing stable and controllable torque during high-temperature operation and smooth opening and closing
- Outstanding resistance to high-temperature oxidation and thermal fatigue, able to withstand frequent temperature cycles without thermal cracking or surface spalling
- It has excellent tolerance to high-temperature steam, superheated media, and high-temperature airflow containing a small amount of particles, making it suitable for a wide range of working conditions
Product Application Scope / Usage Scenarios
Applicable media:
High-temperature steam, superheated steam, heat transfer oil, high-temperature hot water, high-temperature flue gas, hot air, high-temperature hydrocarbon media, molten salt, high-temperature corrosive chemical media, etc
Applicable operating conditions:
Continuous high-temperature operation (450°C~800°C and above), high-temperature alternating cycle conditions, high-temperature high-pressure composite conditions, high-temperature dust-laden airflow or particulate media erosion conditions, and high-temperature sealing conditions requiring no external leakage
Application fields:
Power plant boilers (main steam/reheat steam pipelines), high-temperature steam pipelines for thermal power plants, petroleum refining and chemical heating furnaces and catalytic cracking high-temperature pipelines, chemical high-temperature reactors and heat exchanger support, industrial heat treatment furnaces and atmosphere control pipelines, solar thermal power molten salt systems, secondary high-temperature steam systems for nuclear power plants, cooling and atmosphere control systems for metallurgical heating furnaces
FAQ
What are the core advantages of high-temperature resistant valve balls?
The core advantage of high-temperature resistant valve balls lies in their ability to maintain stable mechanical strength, sealing accuracy, and operational performance even in sustained high-temperature environments. By selecting heat-resistant substrate materials combined with metal hard sealing structures and high-temperature stabilization treatment, the product effectively resists high-temperature oxidation, thermal fatigue, and high-temperature media erosion, avoiding issues such as conventional valve balls softening, deformation, sealing failure, or seizure at high temperatures, ensuring long-term safe and stable operation of high-temperature fluid systems.
What is the maximum temperature that the high-temperature valve ball can withstand?
The specific temperature resistance rating depends on the material chosen. The high-temperature resistant alloy steel/chromium-molybdenum steel series can generally withstand working conditions of 450°C~600°C; High-temperature nickel-based alloy series (such as Inconel 718, GH4169, etc.) with special designs can withstand temperatures of 700°C~800°C or even higher. The actual upper limit of operating temperature also needs to be determined comprehensively by considering medium composition, pressure level, and opening and closing frequency. It is recommended that customers provide specific operating parameters for precise selection.
What are the structural differences between high-temperature resistant valve balls and ordinary valve balls?
Ordinary valve balls mostly use soft seals (PTFE, PEEK, and other non-metallic sealing rings), which can soften, deform, or decompose at high temperatures, leading to sealing failure; The high-temperature resistant valve ball uses a metal hard seal structure (metal valve seat/sealing ring), with a metal-to-metal or metal-to-carbide sealing pair, eliminating the issue of organic material aging. At the same time, the thermal expansion coefficients of the ball and valve seat must be matched and calculated to ensure reasonable sealing pressure and operating clearance are maintained even at high temperatures.
How does the high-temperature resistant valve ball address thermal fatigue under high-temperature cycling conditions?
Our high-temperature resistant valve balls address thermal fatigue from three aspects: first, selecting substrate materials with excellent thermal fatigue resistance and optimizing alloy composition design; Second, a special high-temperature stabilization heat treatment process is used to achieve a uniform and stable microstructure, reducing volume changes caused by phase changes at high temperatures; Third, the ball and valve seat are designed to provide reasonable thermal expansion compensation gaps, preventing jamming or sealing pair damage caused by uneven expansion at high temperatures. For frequent alternating operating conditions, surface reinforcement coating solutions can also be provided to further enhance thermal fatigue resistance.
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