The stem axis deviation from the disc center and the center of the body at the same time, and the sealing butterfly valve oblique vertebral became the three eccentric butterfly valve.
Characteristics of Triple Offset Butterfly Valve
Three eccentric butterfly valves are widely used in medium temperature ≤ 425 ℃ metallurgy, electric power, petrochemical, water supply, drainage, municipal construction, and other industrial pipelines, and are set off for regulating the flow of fluid. The material is divided into cast iron, cast steel, and stainless steel, and its main characteristics:
The API specification of Triple Offset Butterfly Valve
As everyone knows, API609 has in fact become an international standard industrial important Triple Offset Butterfly Valve. While Tritec is fully in strict accordance with the latest version of the design, manufacture of 1997 API609 specifications. More importantly, the basic design of the Tritec is not limited to the API specification, a BS5155 ANSI B 16.34, ASME SEC VIII, and other major specifications can be corresponded, this ensures that the Tritec has played in all industrial areas.
Double Security Structure of Triple Offset Butterfly Valve
Tritec in strict accordance with the API609 specifications, in order to prevent the butterfly plate caused by the influence of fluid pressure, temperature, displacement, and deformation of the valve stem sealing surface occlusion, on the lower side of the butterfly plate are respectively provided with two independent thrust ring, so as to ensure that the valve work normally in any conditions;
At the same time, in order to prevent the unknown cause stem breakage, flying out of the accident, resulting in the valve inside and outside the two lower at the design of the independent blow out preventing mechanism, this also from the side to ensure the Tritec pressure level can be as high as 2500 pound.
No dead zone design of Triple Offset Butterfly Valve
Tritec in the design process, special consideration in control applications, to make full use of the three eccentric butterfly valve sealing principle, do not scratch the valve disc valve seat, valve stem torque through the butterfly plate directly transferred to the sealing surface, that is to say the butterfly plate and the valve seat is almost no friction occurs, thereby to open the valves are common jump phenomenon, eradicate the valve opened degree range of internal friction and other factors of instability caused by the phenomenon, namely regulation can not root in addition to the dead (non sensible zone), which means that Tritec can almost from the 0 opening to enter the regulatory regions, until the 90 opening, the normal control than is generally more than 2 times of the control valve, the highest ratio can be up to above 100:1. This is Tritec as the control valve is used to create good conditions, especially in the large diameter, high cost when the cut-off valve, stop valve, also cannot achieve zero leakage, in need of emergency shutdown condition, must shut off valve, and Tritec set control and shutdown in a body, its economic benefit is in the side valve is extremely considerable.
Body seat structure of Triple Offset Butterfly Valve
Three eccentric butterfly valve seat mounting structure has two kinds, most are installed in the butterfly board, but the Tritec is the body seat ring structure, the seat is installed on the main body for convenience. The advantages and the butterfly plate seat, greatly reduce the valve seat in direct contact, thus reducing the chance of medium erosion degree, and the seat extended seat life.
Sheet seat structure of Triple Offset Butterfly Valve
Tritec seat made of stainless steel sheet and the graphite sheets stacked, this structure can effectively prevent the medium small solids and thermal expansion caused by the sealing surface occlusion, even appear small injury, prevent leakage, which in the double eccentric High-Performance Butterfly Valve on the three eccentric butterfly valve, or other it is unthinkable.
Replaceable seal of Triple Offset Butterfly Valve
Tritec has become an independent school, not only sealing body seat ring can be replaced, and because the disc sealing surface and the butterfly plate are independent, the butterfly plate sealing surface can also be changed, that is to say, when the butterfly plate sealing surface is damaged, do not have to mobilize the forces back to the factory or a sub solution, just change the disc valve the sealing surface can be, this not only greatly reduce the maintenance cost, but also greatly reduce the repair time and repair strength and difficulty.
The balanced fixed structure of Triple Offset Butterfly Valve
Starting from the features of shape, the sealing surface of three eccentric butterfly valve sealing pair Tritec fixed by bolts elliptic distribution fixed, not only accurate positioning but also to make each bolt balanced stress, eliminate caused by uneven stress distribution of the seal pair loosening, leakage.
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