butterfly valve structure of the center line butterfly valve, single eccentric butterfly valve, double eccentric butterfly valve, the difference between a triple eccentric butterfly valves

middle sealing butterfly valve (1) the center line butterfly valve structure for the entire disc and seat in 360 & deg; Inside the circle concentric, with two-way sealing performance, flow rate can be adjusted freely.

most of the center line butterfly valve is sealed, can be made in the body seat with rubber lining ( Figure 2 - 29) , if the medium is corrosive, the town of PTFE, and on the back of PTFE lining rubber, increase resilience. Town ring can be replaced, can also be a stick in the body, and put the town circle butterfly plate.

rubber lining of the flange and pipe flange seal, if when installing the valve, between the flange face to add a rubber gasket, affect the sealing performance of rubber ring, therefore, don't have to reinvent the wheel.

middle sealing butterfly valve due to the interference is mandatory sealing form, so the applied pressure is limited, usually under the condition of not greater than PN10 condition to use. But for water supply and drainage pipeline, it is enough.

(2) the structure of eccentric butterfly valve general eccentric butterfly valve for single or double eccentric structure, the purpose of the eccentric is butterfly plate open to about 20 & deg; After the seat away from the surface, thereby reducing friction. Double eccentric structure is when the design will be axis deviation from the center line of the seal face, forming the first eccentric; Micro deviating from the center line of the pipeline axis, forming a second eccentric. The two eccentric is the purpose of the switch valve stroke, reduce the friction between the seat and seal.

triple eccentric metal sealing butterfly valve on the basis of the double eccentric adds an eccentric Angle & beta; , using the original CAM effect not only, and completely eliminated the 90 & deg; Trip to the seat and the friction between the sealing ring.

the first eccentric axis deviation from the center line of the sealing face a, according to the principle of design and manufacture of butterfly valve is often referred to as one-way eccentric butterfly valve.

a second eccentric & ndash; — Micro axis deviating from the center line of the pipe and valve b, according to a eccentric and two eccentric principle, design and manufacture of butterfly valve is often referred to as double eccentric butterfly valve.

the third eccentric & ndash; — Figure 2 - by 30, the three eccentric structure is more than two eccentric structure an eccentric Angle & beta; , eccentric cone disc sealing surface adopted. The butterfly plate from the geometry and seal completely out of the whole switch Industrial Valves stroke. This unique combination of eccentric, used the CAM effect already, and completely eliminate the friction, so as to realize the valve 90 & deg; Trip, no friction between disc and seat sealing, eliminate the abrasion problem of leakage.

triple eccentric metal sealing butterfly valve to optimize the contact between disc and seat sealing characteristics. The vast majority of butterfly valve contact Angle for 3 & deg; ~ 12. 5° , this range of taper lock range, can produce high sealing torque and torque.

triple eccentric metal sealing butterfly valve sealing surface contact Angle is greater than the taper lock range, from the geometric shapes in addition to stuck on the possible, the torque required to ensure that the valve switch to the valve will not produce very big change within the use fixed number of year.

the characteristics of the butterfly valves

1) with the same specification, compared to other valves pressure rating, shorter butterfly valve structure, small size, light weight, simple structure.

(2) the opening and closing fast, easy to operate, to make a quick opening and closing valves.

(3) has good flow regulating function and closing sealing, long service life and can be used for adjusting.

(4) for large diameter valves, is widely used in large-scale water supply and drainage pipeline.

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