Hard metal sealed double flange butterfly valve

D343Y Three Eccentric Hard Metal Sealed Flange Butterfly Valve

D343Y adopts flange connection, worm gear transmission, and triple eccentric metal sealing structure. The series diameter range is DN50-DN1000, and the material options include WCB, 304, and 316L. The standard configurations of PN, Class, and JIS are listed in parallel.

Triple eccentric metal sealing structure

The three eccentric geometric structure reduces the continuous sliding friction of the butterfly plate sealing surface during the opening and closing process, and forms the required sealing contact in the closed position. The actual sealing pair can adopt different metal materials or hard alloy schemes, which should be confirmed according to the product drawings.

What working conditions are suitable for metal hard seals?

Metal sealing structures are usually used for working conditions where temperature, pressure difference, abrasion, or opening and closing frequency are higher than the applicable range of ordinary elastic soft seals. However, the specific maximum temperature and allowable pressure difference must be determined according to the valve body, sealing ring, packing, and actual standards.

How to confirm bidirectional sealing?

Whether it has bidirectional pressure and specific leakage level should be confirmed based on the valve design direction, pressure difference, and test requirements, and cannot be automatically judged based solely on the names of "three eccentricities" or "hard seals".

For more metal sealing products, please refer toSelection of hard sealed butterfly valveOverview of Butterfly ValvesButterfly valve manufacturer and selection。

Frequently Asked Questions

Does D343Y necessarily use Stellite alloy?

Not necessarily, the specific sealing material and welding scheme should be confirmed according to the product technical documents.

Is the triple eccentric hard seal butterfly valve necessarily bi-directional zero leakage?

It cannot be judged solely based on the structural name, but should be based on the design direction and testing requirements.

Can Class900 and PN64 be directly considered as having the same pressure level?

No, they belong to different standard systems and need to be checked separately for material and pressure temperature ratings.