the basic structure characteristic of triple eccentric butterfly valve is the valve stem position determines the two eccentric axial and radial, form the butterfly plate the gradient of the cone made another Angle eccentric. In the design of triple eccentric butterfly valve should be reasonable when the design of each parameter value to avoid interference phenomenon. In this paper, the qualitative analysis of the structural parameters of the triple eccentric butterfly valve change on the influence of the interference phenomenon.

in the condition of valve seated butterfly plate and seat sealing surface contact, completely fit everywhere. The butterfly plate around the rotary axis rotation Angle, without interference if the rotation process, the Industrial Valves by interference test. Set P for butterfly plate sealed from any point on the surface, because of the point P track of rotary axis rotate as a circle, a point P and perpendicular to the rotation axis plane intersecting the seat sealing surface M, the curve obtained in the x & the isin; ( e - b/ 2 , e + b/ 2 ] For a or a hyperbola in two parts. If in the process of rotating circular trajectory within the scope of the sealing surface width is always in the interior of the hyperbolic trajectories, said the butterfly plate sealing surface will not interference with the valve seat sealing surface, if in the process of rotating circular trajectory, the outside of the seal face width range inner hyperbolic trajectories disc sealing surface will interference with the valve seat sealing surface.

interference does not occur using programs can draw some parameter range. With DN = 200 mm, the PN = 215 mpa butterfly valve as an example is analyzed.

on the basis of an analysis of the butterfly plate is not interference occurs, the following conclusions. (1) with the increase of a. & delta; Linear increase after reduction first, in order not to make the valve produces interference phenomenon, should choose a value. (2) with the increase of e & delta; Approximate straight down, so e near the minimum value in general. (3) with the increase of b & delta; Too much, so b values should not be commonly. (4) as & alpha; The increase of & delta; After the first increased, & alpha; The value of the near should choose a turning point. (5) with & beta; The increase of & delta; The approximate straight increase, so the & beta; Should choose larger values.

in the process of triple eccentric butterfly valve determine the various parameters of many parameters can only determine a certain range, the parameter selection in the process of rationalization of main factor are sealed, torque and the intervention and the question of the valve structure and so on. Can take advantage of the method in the process of parameter determination interference does not occur to verify the parameter range, and then according to the requirements of the valve structure design of other parameters for selection, so the valve in the process of product design that is more convenient for interference inspection, improve the efficiency of product design.

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