Square stem soft-seated butterfly valve use process problem
time：
2023-02-24
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 in use:
1. The manufacturer of Square stem soft-seated butterfly valve tells you that since the multi-layer soft-seated butterfly seal ring is fixed on the valve plate, when the valve plate is normally open, the medium will form a positive wash on the sealing surface, and the soft seal in the metal sheet interlayer will After the belt is washed, it directly affects the sealing performance.
2. Restricted by 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. The manufacturer of Square stem soft-seated butterfly valve tells you that 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. When the medium in the channel flows backwards, as the medium pressure increases, the unit positive pressure between the valve plate and the valve seat is less than the medium pressure, and the seal begins to leak.
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