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在引水式电站中,引水管道各岔管末端的水轮机涡壳前装设进水阀门,这样当单台机组进行检修时只需关闭该阀门,而不影响其他机组的运转。但一般坝后式电站在一机一管的情况下,只在进水口装设快速闸门。水轮机进水阀门除了起到上述的检修阀门的作用外,还当水轮机产生飞逸工况时进行动水关闭,保护机组免遭逸速的损害,起到事故阀门的作用。由于进水阀门在动水关闭过程中,当活门转角至70°～85°时(全开时为0°,全关时为90°),水
In the diversion station, a water inlet valve is installed in front of the turbine scroll at the end of each branch pipe of the water diversion pipeline, so that when the single unit is undergoing maintenance, it is only necessary to close the valve without affecting the operation of other units. However, in general, a post-dam power plant is equipped with a rapid gate at the water inlet in the case of a single pipe. Turbine inlet valve in addition to play the role of the above-mentioned inspection valve, but also when the hydraulic turbine runaway conditions generated when the closure of the water to protect the unit from Yi-speed damage, play the role of the accident valve. As the inlet valve in the closed process of moving water, when the valve angle to 70 ° ~ 85 ° (fully open when 0 °, fully closed when 90 °), water