High Temperature Knife Gate Valve Description
High temperature knife gate valve is a knife-type gate valve designed for high temperature working conditions. Its gate is made of high temperature resistant alloy or ceramic coating material. The valve seat and sealing structure are adapted to high temperature environment and can withstand extreme temperatures of ≤1100℃. It is suitable for boiler ash discharge, high temperature powder transportation, metallurgical slag treatment and other scenarios.
Structure and material
Valve body and valve cover
Material: 2520 stainless steel (06Cr25Ni20), 310S stainless steel or carbon steel sprayed with high temperature resistant ceramic to enhance corrosion resistance and thermal deformation resistance;
Structure: split or integral design, straight flow channel to reduce medium retention and thermal stress.
Gate plate
Knife-shaped or wedge-shaped design, surface surfacing with hard alloy (such as tungsten carbide) or spraying ceramic layer to improve wear resistance and high temperature resistance;
Some models use elastic gate structure to compensate for thermal expansion deviation under high temperature through slight deformation.
Sealing system
High temperature hard seal: metal to metal seal (such as stainless steel + carbide), leakage ≤26×DN mm³/s;
Composite seal: some models combine metal seal with elastic compensation structure to adapt to high temperature fluctuations.
Drive device
Support manual, electric or pneumatic drive, actuator high temperature resistant design (such as heat shield, high temperature resistant lubricant).
High Temperature Knife Gate Valve specification
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Execution materials
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Stainless Steel,Cast iron
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Body material
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Stainless Steel (SS316, SS304)
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Optional size
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1/2"~8", DN15~DN200
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Sealing Material
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NBR,EPDM,PTFE,Metal seal
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Applicable Media
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Gas, liquid, water, oil control
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Applicable temperature
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-30-425 ℃
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Optional actuator function
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Switching type, regulating type, intelligent type
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Optional collocation
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Electric valve, sealing ring, limit switch, actuator
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Operating pressure
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1.6~6.4 M Pa
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Lifespan
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1,500,000 (1 Million) Times
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Optional Accessories
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Namur Solenoid Valve, Limit Switch, F.R.L, Position Indicator, Manual Device
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Application
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Food & Beverage, Water & Wastewater, Ultra Pure Water, Desalination, Chemical, Textile, Pharmaceutical, Pulp & Paper, Mining,
Boiler and Power Industries |
High Temperature Knife Gate Valve
Features
Resistant to extreme high temperatures:
The operating temperature range is -29℃~1100℃, suitable for media such as boiler ash and high-temperature powders;
No external cooling device is required, reducing system complexity.
Strong wear resistance:
The gate and valve seat are coated with carbide or ceramic, which can handle hard particle media such as slag and coal powder.
Reliable sealing:
The stability of metal hard seals is maintained at high temperatures to avoid failure of soft sealing materials due to high temperatures;
The gate self-spinning design can scrape off adhesives on the sealing surface to prevent jamming.
Easy maintenance:
The modular structure supports rapid replacement of gates or sealing components to reduce downtime.
Applications
Power industry:
High-temperature medium cutoff and flow regulation of boiler ash removal systems and power station ash removal pipelines.
Metallurgy and mining:
Transportation of blast furnace slag, high-temperature metal powders, and sintering machine flue gas treatment.
Chemical and environmental protection:
High-temperature waste gas treatment, powder material control in chemical reactors.
Building materials industry:
Cement kiln exhaust gas and high-temperature raw material powder pipelines are cut off.
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