VALVE

  Among all types of valves, there is a particular one with the most beautiful name—the   butterfly valve . How did the name come from? In answering this question, we could use analogy. For example, the ball valve looks like a ball, so can we guess that the butterfly valve looks like a butterfly? Well, it seems a little funny, but I have to say: “Bingo, right answer!” The butterfly valve is a regulating valve with simple structure, and it can be used for switching control of a low pressure pipeline medium. The opening and closing member (valve or disc) of the butterfly valve is a disc that rotates around the valve shaft to open and close. In the cylindrical passage of the butterfly valve body, the disc rotates about the axis to achieve flow control. The valve is fully open when the disc reaches 90°, and changing the angle of the disc can adjust the flow of the medium. When the butterfly valve is fully open, it has a small flow resistance; when it is between about 15° and 70°, ...

FEIDA  High Performance Butterfly Valves  are used in rigorous applications especially in the petrochemical and offshore settings. FEIDA design and engineered this high quality butterfly valves with a fire safe feature. Such feature typically incorporates a secondary sealing seat that will maintain a positive shutoff when the primary seal is destroyed in a fire. This secondary sealing seat is made of indestructible materials that can tolerate extremely high temperature. Fire safe butterfly valve models, just like other types of butterfly valves, are used not only for on/off function but also for control applications. In most cases, the primary seat of fire safe butterfly valves offers near zero-leakage assurance. The secondary metal seat can perform sealing function, but may allow minimal leakage at high temperature that occurs during fire. The main sealing seat is usually made of the material called PTFE (polytetrafluoroethylene) also known as Teflon. The ...