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Haed sealed ceramic ball valve new product that our company develop newly , product this use electricity , petroleum , chemical industry pipeline system open and close and close the device mainly .
硬密封陶瓷球阀是我公司新开发的新产品，该产品主要用于电力、石油、化工等管路系统上启闭装置。
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Thereby according to thermoelastic-plastic theory , using incremental variational stiffness method , a finite element program with quadrilateral 8-rodes isoparametric element is programed , and the thermal stress as well as residual stress of the cylinder haed after shutdown is computed by applying this program .
本文还按照热弹塑性理论，利用增量变刚度法，编制了采用四边形八节点等参元的有限元程序，对缸盖的热应力及停机后的残余应力进行计算。