| Author, making "no-leaking valve" as research object, has finished the control system design based on 89C51 single chip computer; Author, in addition, has finished intensity design for valve body.This thesis is divided into two parts in total. For the first part: In the first place, according to the control demands of the system and the local technics demands, author has designed the composing elements of the control system; In the next place, author, based on the composing elements of the control system, has designed the prerequisite hardware resources which mainly include the serial communication circuit, the display circuit, and the step-motor drive circuit etc. Thereinto, the serial communication circuit chiefly plays the role of translating information between single chip computer and top computer, the display circuit mostly accomplishes the function of real time displaying the current position of valve pole, the step-motor drive circuit mainly accomplishes the function of magnifying the pulse signal; In the end, due to the hardware circs, author has designed software for the system. In practice, considering the error caused by data sampling, author has made use of program judgement method which belongs to digital filter method to make error signal be within allowable scope. At the same time, author also has made use of VC program language to design the communication program of top computer. For the second part: Above all, author shortly has expounded the basic conception and theory of the FEM; Secondly, after making reasonable predigestion for valve body model, author has expounded valve body stress calculation method and designed the rules of influencing valve body intensity's correlation factors; Lastly, author has made use of ANSYS software to accomplish digital calculation of real valve body model and forecasted the most dangerous position of valve body.
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