首先通过检修口拆卸阀瓣的后面及其弹簧末端。
Remove through access port with back of clapper first with spring end down.
介绍了一种液压式大炮弹底螺拆卸机的液压系统，该机及其液压系统充分考虑了安全性和实用性。
A kind of hydraulic system is introduced. The system is used in a remover of bottom-bolt of big shell. Its safety and utility are enough considered.
以可拆卸板式换热器为重点，简要介绍了国外板式换热器新产品、新技术及其应用情况等最新技术进展。
The article gives emphasis to the disassemble PHE. The newest technical developments are briefly introduced for new products, new technologies, their applications and so on.
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