The integrated high-temperature ball valve controls fluid flow through ball rotation (90° opening/closing), suitable for high-temperature media (typically withstanding temperatures from 300℃ to 600℃, or even higher). Its "integrated" design means the valve body and connecting components (such as flanges and welded ends) are directly cast or machined as a single unit, reducing leakage points and increasing structural strength.
Key Structures
Ball: Made of high-temperature resistant materials (such as 304/316 stainless steel, high-temperature alloy steel, or ceramic coating), with a precision-ground surface ensuring a tight seal.
Seat: Typically a hard metal seal or a high-temperature resistant soft seal (such as graphite or PTFE composite material), accommodating thermal expansion at high temperatures.
Stem: Extended design with an anti-flyout structure (such as double-pin fixing) to prevent the stem from detaching due to thermal stress at high temperatures.
Integrated Body: No independent connecting flange; integrated casting or welding reduces seams and lowers the risk of leakage.
Performance Advantages
High Temperature Adaptability
Material Selection: The valve body, ball, and seals are all made of high-temperature resistant alloys or special coatings to ensure no deformation or jamming at high temperatures.
Thermal Compensation Design: A thermal expansion gap is reserved between the valve seat and the ball to prevent seal failure due to high temperatures.
Sealing Reliability
Metal Hard Seal: Suitable for high-temperature, high-pressure, and particulate media, with strong wear resistance.
Soft Seal Reinforcement: High-temperature soft sealing materials (such as graphite) provide elastic sealing at low temperatures and maintain stability at high temperatures through a metal backing.
Compact Structure
Integrated design reduces flange connections, lowers leakage points, simplifies installation, and saves space.
Operational Stability
Low-Torque Increase Design: Optimized contact surface between the ball and valve seat reduces frictional resistance at high temperatures, ensuring flexible switching.
Anti-Jaw-Off Structure: The ball surface is coated or sprayed to prevent media coking or adhesion.
Application Scenarios
Petrochemical Industry
Used in high-temperature cracking units, catalytic reforming reactors, etc., to control the flow of high-temperature oil, gas, and steam. Power Industry
Regulating high-temperature steam in boiler feedwater systems and steam pipelines to ensure safe system operation.
Metallurgical Industry
Blast furnace gas pipelines and continuous casting machine cooling systems for handling high-temperature molten metal or gases.
Pharmaceutical and Food Industries
Controlling the flow of steam or hot media in processes requiring high-temperature sterilization.
Selection and Maintenance Considerations
Key Selection Parameters
Temperature Range: Confirm whether the valve's upper temperature resistance limit covers the operating requirements.
Pressure Rating: Select a valve that matches the system pressure (e.g., ANSI Class 150-2500).
Media Characteristics: Consider the corrosiveness and particle content of the media to select appropriate materials and sealing methods.
Maintenance Recommendations
Regularly check the wear of the sealing surfaces; replace the valve seat or ball if necessary.
Under high-temperature conditions, avoid frequent switching to reduce thermal fatigue.
During installation, ensure pipeline alignment to prevent valve body deformation due to stress.