The high-temperature control valve body is made of high-temperature resistant materials such as chromium-molybdenum steel and stainless steel. For ultra-high temperature applications, a non-metallic heat-resistant lining or special alloy can be selected. The structural design uses a baffle-type structure with pre-reserved clearance to prevent thermal expansion jamming, and external bearings support the gate positioning, reducing the load on the actuator.
The sealing system is equipped with flexible graphite packing resistant to 600℃, and composite graphite valve seats or high-temperature alloy overlay technology can achieve effective sealing above 500℃. Product types include ordinary high-temperature alloy valves, baffle-type high-temperature valves, and ultra-high-temperature valves with non-metallic linings, suitable for media such as steam and heat transfer oil. Some models support intelligent actuators and noise-reducing, anti-cavitation valve cage designs.
GNEE Group specializes in the production and supply of high-temperature control valves and provides customized services.
high-temperature control valve Working Principle
The working principle of a high-temperature control valve is to receive external control signals, driving the actuator to move the valve core to regulate the parameters of the high-temperature medium. Its core lies in achieving precise control through a high-temperature adaptability design, which can be analyzed from three aspects:
1. Signal-driven and flow regulation mechanism:
When the control system outputs a standard signal (such as 4-20mA current or 0.02-0.1MPa air pressure), the actuator (pneumatic diaphragm type or electric servo type) converts the signal into thrust, driving the valve stem to move axially.
The valve core moves up and down within the valve body with the valve stem, changing the flow area between the valve core and the valve seat, thereby regulating the flow rate, pressure, or temperature of the high-temperature medium (such as steam or heat transfer oil). For example, when the signal increases, the valve core moves upward, the flow area expands, and the medium flow rate increases.
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2. High-Temperature Environment Adaptability Design:
The valve body and core are made of high-temperature resistant alloys (such as Cr5Mo and Inconel 625), capable of withstanding temperatures above 600°C. The sealing structure (metal bellows or flexible graphite packing) compensates for thermal expansion through elastic deformation, preventing media leakage. The valve cover is equipped with an expansion joint or flexible support to eliminate the jamming stress caused by the difference in thermal expansion between the valve body and the valve stem.
3. Thermal Balance and Control Stability:
Some structures are equipped with heat dissipation fins or water-cooling jackets to control the temperature gradient of the valve body and avoid local overheating and deformation. The actuator is equipped with a heat insulation cover to ensure that the ambient temperature of the drive components is <80°C, preventing diaphragm aging or motor overheating failure, ultimately achieving stable regulation under high-temperature conditions.
high-temperature control valve Structural Features
1. High-Temperature Resistance: Made of high-temperature resistant materials, the valve can operate normally in high-temperature environments, ensuring long-term stable operation.
2. High-Precision Control: An advanced electric actuator allows for precise control of the valve opening, achieving ideal flow and pressure regulation.
3. Low Maintenance Costs: This valve features a reasonable design, long service life, and simple maintenance, reducing user costs.
high-temperature control valve Application Areas
High-temperature control valves are widely used in power, chemical, petroleum, and metallurgical industries, especially in the following scenarios:
1. Power Plant Boilers: Used to control steam flow and ensure safe boiler operation.
2. Chemical Reactors: Used in chemical production processes to precisely control the flow of reactants and ensure smooth reaction.
3. Oil Refineries: Regulating the flow rates of various media during the oil refining process to improve production efficiency.
4. Thermal Systems: Used for temperature and flow control in hot water or steam systems to ensure efficient operation of the heating system.