A due to soft and hard fold ring fixed in the valve plate, when the valve plate normally open state medium sealing surface, forming a positive erosion, erosion, sealing with metal powder layer, directly affect the sealing performance.
Two, structural conditions of said structure does not conform to the following path DN200 valves, due to the valve plate overall structure is too thick, flow resistance.
The principle of three, lined with rubber, because butterfly-valve plate seal face and seat sealing pressure valve plate to the seat between the transmission of torque.
The lining flow state is clamp valve, valve, exhaust valve medium pressure, the higher the squeezed tight seal.
The increase of countercurrent flow medium and medium pressure valve plate and valve seat unit is pressure is less than the medium pressure seal between began to leak.
Four, high-performance lined butterfly valve, whose character is: said stainless steel butterfly valve seat sealing by soft T multi-layer stainless steel plate sealing ring on both sides.
Electric stainless steel ball valve, http://www.