First, the 2 and 5 valvepowervalve on the difference is only absolute.
首先，2气阀和5气阀动力上的区别只是绝对的。
2
Nuclear powervalve repair, replacement nuclear power plant maintenance in the total cost of about 50%.
核电阀门的维修、更换费用在核电站维修总额中约占50%。
3
According to the structure of servo mechanism on HD2se-ries pump, their functions have been analyzed. The structure and control process of constant powervalve are mainly discussed.