What is a high performance butterfly valve?
Structure and principle of high performance butterfly valve
High-performance rubber-lined butterfly valve
The high-performance rubber-lined butterfly valve is a compact structured rubber-lined butterfly valve, especially suitable for regulating or controlling the flow and pressure of various water, industrial water, sewage, air, HVAC, city gas, and LPG. When closed, the valve has zero leakage.
(1)The valve seat structure adopts the COS curve sealing structure patented worldwide, which reduces the friction between the valve plate and the valve seat, reduces the torque of the actuator, and extends the life of the seat ring. The sealing process is equivalent to a double eccentric valve.
(2)The sealing surface of the butterfly valve is spherical, so that when sealing, the contact is quite smooth, especially the friction at the shaft seal is reduced. The life of the seat ring is greatly extended.
(3)The metal embedded ring in the seat ring can automatically close the gap between the stem and the seat ring when the stem is tilted by an unbalanced force, eliminating the possibility of axial leakage.
COS curve
The COS curve sealing structure allows the valve plate to be closed without an increase in torque, and when closed the plate and seat ring are in contact at the same time in a 360-degree circle, thus reducing friction, reducing torque, and extending the life of the seat ring, ensuring that the butterfly valve can be maintained for a long time with zero leakage. The reduced friction and torque also allow the use of low-power actuators, thus reducing the cost to the user.
The spherically machined valve plate
The valve plate is machined as a complete sphere, each part of the sealing surface is part of the sphere, the plate, and the valve ring are machined with the same sphere, the gap between them is small, no friction, the plate rotates smoothly, even at the axial sealing surface at the top and bottom of the plate, such a sealing surface is quite smooth when sealing, despite the contact, so the torque is reduced and the sealing performance is improved. The sealing performance is improved.
The spherically machined valve plate
The valve plate is machined as a complete sphere, each part of the sealing surface is part of the sphere, the plate, and the valve ring are machined with the same sphere, the gap between them is small, no friction, the plate rotates smoothly, even at the axial sealing surface at the top and bottom of the plate, such a sealing surface is quite smooth when sealing, despite the contact, so the torque is reduced and the sealing performance is improved. The sealing performance is improved.
Fully Teflon-lined valve plate and seat
All parts of the valve that come into contact with the fluid are lined with Teflon, including the top and bottom ends of the stem, to prevent fluid from seeping out along the stem.
Separate seal design
The seal ring design is rubber and Teflon independent, yet complementary to each other to enhance sealing performance. The use of rubber makes the seal flexible and reduces the amount of rubber used, eliminating the possibility of the rubber expanding and jamming the valve plate in the closed position due to temperature rise.
New structural design improves sealing performance
1, The PFA with a thickness of 3mm or more effectively prevents the penetration of various gases and is highly resistant to corrosion.
2, A strong spring is added to each of the upper and lower stuffing boxes to overcome the influence of temperature fluctuations on the seal.
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