L90 series metal sealed butterfly valve

The valve uses a metal sealing ring with a U-shaped cross-section. In the closed state, it deforms with the elliptical butterfly plate and tightly engages with the sealing surface around the butterfly plate. Due to its ability to float radially within the groove of the valve body, it can compensate for fluctuations in the thermal cycle and is used for opening, closing, and throttling on the main, branch, and steam pipelines of district heating.

Valve characteristics

Independent seal not affected by medium pressure
Due to its unique structure, the butterfly plate and valve seat are sealed by mechanical force without relying on medium pressure. Therefore, regardless of the pressure, bidirectional sealing can be achieved. The valve seat sealing ring floats, ensuring reliable sealing even under repeated temperature changes.

Integral valve body
The valve body is made of high-quality carbon steel forgings, and the integral structure eliminates concerns about external leakage. It is lightweight and easy to weld with pipelines.

Reliable Performance
The L90 butterfly valve adopts the patented Neldisc design principles. The advantages of this design have been verified by practical applications and recognized by authoritative units. Hundreds of thousands of these valves are reliably used in regional heating systems and steam pipelines in Finland, Sweden, France, South Korea, Poland, and the People's Republic of China.