Problems in the use of Square stem soft-seated butterfly valve
time：
2022-12-06
Square stem soft-seated butterfly valve, as a component used to realize pipeline system cut-off and flow control, has been widely used in many fields such as petroleum, chemical industry, metallurgy, and hydropower.
Square stem soft-seated butterfly valve, as a component used to realize pipeline system cut-off and flow control, has been widely used in many fields such as petroleum, chemical industry, metallurgy, and hydropower.
Problems during the use of Square stem soft-seated butterfly valve:
1. Since the multi-layer soft and hard stacked sealing ring is fixed on the valve plate, when the valve plate is normally open, the medium will form a positive erosion on the sealing surface, and the soft sealing belt in the metal sheet interlayer will directly affect the sealing performance after being eroded.
2. The manufacturer of Square stem soft-seated butterfly valve tells you that due to the limitation of structural conditions, this structure is not suitable for valves with a diameter below DN200, because the overall structure of the valve plate is too thick and the flow resistance is large.
3. Due to the principle of triple eccentric structure, the sealing between the sealing surface of the valve plate and the valve seat depends on the torque of the transmission device to make the valve plate press against the valve seat. In the positive flow state, the higher the medium pressure, the tighter the seal will be squeezed. The manufacturer of Square stem soft-seated butterfly valve tells you that when the medium in the channel flows backwards, as the pressure of the medium increases, the seal will start to leak when the unit positive pressure between the valve plate and the valve seat is less than the pressure of the medium.
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