The hardness of the aerodynamic butterfly valve rubber valve seat produced by pneumatic butterfly valve manufacturers is typically between 70 and 75, but with the continuous improvement of the product structure, this hardness value range has the following problems:
1, the impact on the opening and closing moment is more affected, and the impact of the sealing compression is more sensitive to the performance of the product performance, that is, the compressed amount control value is high, the numerical range is narrow, and the mechanical machining of the relevant part is increased. Precision and the difficulty of production of rubber parts.
2, is not conducive to assembly, especially when the rubber valve seat hardness is about 75, it is not easy to load it into the valve body, and it is easy to damage the valve seat.
3, physical mechanical properties are poor than low hardness, reflecting the rebound and anti-resistance.
