Picture of triple eccentric butterfly valve - machining process of sealing surface of triple eccentric butterfly valve seat
Time: December 5, 2020 19:16:41 Source: Yonglong Valve Reading: zero second
Picture of triple eccentric butterfly valve - machining process of sealing surface of triple eccentric butterfly valve seat
The structural feature of the triple eccentric butterfly valve is that the conical axis of the sealing surface of the butterfly plate is inclined to the cylindrical axis of the body while the axial position of the double eccentric valve stem is eccentric, that is, after the third eccentric, the sealing section of the butterfly plate is no longer true circle, but ellipse, and the shape of its sealing surface is asymmetric, and one side is inclined to the centerline of the body The other side is parallel to the center line of the body, so the shape of the sealing surface is asymmetric. One side is inclined to the center line of the body, and the other side is parallel to the center line of the body.
The stem axis of the triple eccentric butterfly valve deviates not only from the sealing surface of the valve plate, but also from the center of the valve body. At the same time, the axis of rotation where the sealing surface of the valve seat is located and the axis of the valve channel are eccentric at a certain angle;
After the butterfly valve passes the third eccentricity, the sealing surface of the butterfly plate is no longer round, but elliptical;
The biggest feature of the third eccentricity is that it has fundamentally changed the sealing structure. It is no longer a position seal, but a torque seal; That is, instead of relying on the elastic deformation of the valve seat for sealing, it relies on the sealing pressure of the contact surface of the valve seat to achieve the sealing effect;
Tricentric butterfly valve (Trieccentric butterfly valve) solves the problem of zero leakage of metal valve seat, and its sealing level can reach V I leakage; Metal valve seat can be used under high pressure and high temperature conditions; The butterfly plate does not scratch the valve seat, and the opening and closing torque of the valve is greatly reduced;
When machining the sealing surface of the valve seat, it is necessary to design a gradient plate tooling whose gradient is consistent with the third eccentricity, so that the elliptical shape and eccentric geometric characteristics of the sealing surface of the factory can be processed. The major feature of the third eccentricity is that it fundamentally changes the sealing structure, no longer a position seal, but a torque seal, that is, it does not rely on the elastic deformation of the valve seat The sealing effect is achieved by completely relying on the contact surface pressure of the valve seat, so the problem of zero leakage of the metal valve seat is solved at one fell swoop, and because the contact surface pressure is proportional to the medium pressure, high pressure and high temperature resistance is also readily solved.
The triple eccentric butterfly valve manufactured by Yonglong Valve, as the crystallization of new valve technology, promotes the advantages of various valves and avoids the disadvantages of various valves, has been paid more and more attention by users and designers. The pressure rating can reach 2500 pounds, the standard diameter can reach 48 inches, and the clamp, lug, flange, ring connection, butt welding, jacket, and various structural lengths can be matched. Moreover, due to the large choice of materials, the high and low temperature and various corrosive mediums such as acid and alkali can also be matched freely.
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