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原文
Control valve introduced Control valve is a throttle valve for pressure compensation. It has given poor and the throttle valve in series. Throttle before and after the pressure reducing valve spool were diverted to the right and left ends, when the load pressure increases, so the effect of liquid left in the valve core pressure, right valve, vacuum mouth increase the pressure drop decreases, so that the throttle pressure (p2-p3) remain unchanged; and vice versa. This is a constant flow control valve (without load).
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译文：
调速阀是进行了压力补偿的节流阀。它有定差减压阀和节流阀串联而成。节流阀前、后的压力分别引到减压阀阀芯右、左两端，当负载压力增大，于是作用在减压阀芯左端的液压力增大，阀芯右移，减压口加大，压降减小，从而使节流阀的压差（p2-p3）保持不变；反之亦然。这样就是调速阀的流量恒定不变（不受负载影响）。

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