High Temperature Wafer Butterfly Valve

High temperature wafer butterfly valve is a valve specially used for high temperature media (such as flue gas, steam, high temperature gas). It adopts wafer connection structure and realizes pipeline opening and closing or flow regulation by rotating butterfly plate. It is suitable for high temperature and high pressure scenes with temperature ≤425℃ and pressure ≤PN16.

Structural composition
Valve body: Made of cast steel or carbon steel, resistant to high temperature and high pressure, and the surface can be treated with anti-corrosion.
Butterfly plate: Streamlined design, surfacing cobalt-based carbide or stainless steel, wear-resistant and erosion-resistant.
Sealing structure: Three-eccentric metal hard seal (valve plate and valve seat oblique cone contact), the sealing performance increases with the increase of pressure.
Drive mechanism: Supports manual (worm gear, handle), pneumatic or electric operation, and some models are equipped with self-locking function.
Connection method: Wafer flange design, directly clamped with the pipeline through stud bolts, compact structure.

 

high temperature wafer butterfly valve

 

Advantages and Disadvantages

Advantages:
Strong stability under high temperature and high pressure conditions, and better sealing performance than soft-sealed butterfly valves.
Convenient maintenance, no need to disassemble the valve body for replacing the sealing ring, reducing downtime costs.
Good tolerance to dusty and particle-containing media (such as flue gas and coal gas).

Disadvantages:
Valves with small diameters (below DN200) have large flow resistance due to the thickness of the butterfly plate.
Cavitation is prone to occur in the long-term half-open state, resulting in damage to the butterfly plate or sealing surface.
The manufacturing cost is higher than that of ordinary rubber-sealed butterfly valves.

Precautions
Selection requirements:
Select the valve body material according to the medium temperature (such as cast steel resistant to 425℃, carbon steel resistant to 300℃).
For particle-containing media, it is necessary to give priority to surfacing carbide butterfly plates.

Installation specifications:
During installation, the pipeline flanges must be aligned and the bolts must be tightened evenly to avoid uneven force on the valve body.
Avoid the butterfly plate being in a throttling state of 15°~75° for a long time to prevent cavitation.
‌Maintenance management‌:
Regularly check the wear of the sealing surface and add lubricant every six months.
In high temperature environments, the risk of valve stem deformation needs to be monitored and high temperature resistant packing needs to be replaced if necessary.

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