Triple eccentric butterfly pneumatic valve sealing numerical simulations of stress uniformity of 1)

in petroleum, chemical, food and beverage industries, the frequently used measurement device fill the general equation of butterfly pneumatic valve, sealing pressure is not depend on the interference between the encoded music, in an open position caused by compression of rubber sealing pieces is often easily damaged. As a result of the existence of triple eccentric butterfly pneumatic valve parameters, therefore, it is enclosed, than the traditional adjustment between pneumatic valve sealing pneumatic valve seat sealing pressure can change the driving moment of flexible dry used in production, eliminating the traditional elastic pneumatic valve seat material aging, factors such as fault caused by the elastic seal between the sealing pressure decline and disappear. Pneumatic valve sealing performance and using life have greatly improved [ ] 。
triple eccentric butterfly pneumatic valve sealing seal structure is the key of its products. After the seal by the relative rotating cone Angle, the eccentric shaft tube, consists of two parallel plane truncation surface derived from the surface. Butterfly with pneumatic valve relative to the channel and radial eccentric center of rotation axis, make up the triple eccentric butterfly pneumatic valve. Figure. Due to the structure characteristics of triple eccentric butterfly pneumatic valve, thus in the process of seal, seal in non-uniform stress distribution of the seal. In order to reduce the aerodynamic torque, the valve closed to further improve the triple eccentric butterfly pneumatic valve, the non uniformity of stress distribution on the seal on the basis of numerical simulation implementation interference seal face life.

a method of solving the nonlinear contact problem
pneumatic butterfly valve pneumatic butterfly valve is forced to closed area [ ] 。 Based on the principle of known, pneumatic valve seal should be consistent with [ ] Conditions:
quality management & amp; lt; 问& lt; ( Q]
q - among them The actual sealing pressure ratio, mpa;
( Q] - More than the allowed pressure sealing, MPa materials;
QM seal than necessary, MPa pressure, its sealing surface, materials of sealing surface and the width of the medium pressure.
to DN diameter, pseudo MPa pressure for mm triple eccentric metal sealing butterfly pneumatic valve such as the surface of the width of the work: from literature [ ] Table - As is known to all, the proportion of MPa pressure allows, necessary sealing pressure than MPa quality management.
the numerical simulation of stress distribution of the condition of pneumatic butterfly valve is to satisfy the sealing seal inside improve, in order to further optimize design provides a theoretical basis for surface stress distribution even butterfly.
the sealing process, with conical seal seat and regional location and the size of the contact interface between the contact state is unknown in advance of the CD. Demonstrate contact complex nonlinear characteristics. In the process of numerical simulation of pneumatic butterfly valve seal, use something touch physical model, the contact surface is divided into two passive body ( The target body) And take the initiative to contact body b ( The body) 。 A passive sealing part of the body, as a representative of the active body sealing disc tower B part. A report on (and in any contact Don't mesh nodes) Passive physical contact physical activity node, as shown in figure. On the degree of agreement between contact objects of freedom [ ] Time, the deformation of the active and passive node analysis to determine the boundary conditions, then coordinate from the variational principle and the coulomb's law, set up joint, the contact boundary deformation equations system, incremental iterative nonlinear equation is resolved. Updated Lagrangian method is used to solve [ ] 。 Keywords:
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