Wafer Triple Offset Butterfly Valve

The wafer-type triple-eccentric butterfly valve adopts a triple-eccentric structure (the valve stem axis deviates from the center of the butterfly plate and the center of the valve body, and the valve seat rotation axis forms an angle with the valve body channel axis). The sealing surface is opened and closed without friction through the rotation of the butterfly plate. It is suitable for high temperature, high pressure and corrosive media.

Valve body and butterfly plate:
The valve body is a clamp-type connection, and the material is mainly stainless steel (304/316) or carbon steel. The surface of the butterfly plate is often welded with hard alloy (such as tungsten carbide) to enhance wear resistance.
Typical models such as D343H and D673H support manual worm gear, pneumatic or electric drive.

Sealing form:
Multi-layer metal seal: Combined with the three-eccentric structure and multi-layer metal sealing ring (such as J-shaped elastic sealing ring), a two-way "tighter and tighter" sealing effect is achieved, and the pressure resistance can reach PN40 (Class 300).
Dynamic sealing principle: When the butterfly plate rotates, the sealing surface contacts/disconnects the valve seat point by point to avoid friction loss and extend the service life.

 

Wafer Triple offset Butterfly Valve

 

 

‌Selection and maintenance recommendations‌
‌Selection points‌:

‌Media adaptation‌: Carbide sealing surfaces are preferred for media containing hard particles, and stainless steel lining or special coatings can be selected for corrosive fluids.
‌Drive mode‌: Pneumatic actuators (supporting quick cut-off) are recommended for high-frequency operation scenarios, and worm gear manual drive can be selected for low-pressure scenarios.
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Maintenance requirements‌:
Regularly check the wear of the sealing surface, and high-temperature resistant grease needs to be added in high-temperature conditions to maintain the sealing performance.

Ensure that the flanges are aligned during installation to avoid uneven force on the butterfly plate causing sealing failure.

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