重庆升降平台下降靠自身重量为动力，将活塞下部的油压出去，自身渐渐下降。Ningbo lift platform down by its own weight as the driving force, the lower part of the hydraulic pressure out of their own, gradually decreased.

所以重庆升降平台活塞下部的油排出去的速度决定了下降的快慢，一般油缸的下部的进油管路上按有多种阀其中有一个电磁节流阀（其本质是电磁阀与节流阀二阀合一）。So Ningbo lifting platform at the lower part of the piston of the oil drain rate determines the speed of decline, the bottom of the cylinder inlet pipe by a variety of valve and one electromagnetic throttle valve (the essence of electromagnetic valve and a throttle valve two valve one).

其作用是：电磁阀用于控制节流阀，节流阀用于控制油管内液体进出油量的大小。The role of the solenoid valve is used to control the throttle valve and the throttle valve is used to control the amount of oil in the oil pipe.

一般节流阀阀体上都安有调整油量的旋钮，就像音量旋钮或水龙头旋钮。所以你可以通过调整重庆升降平台节流阀上的旋钮来调整下降速度。 General throttle valve body on the safety knob to adjust the amount of oil, like the volume knob or faucet knob. So you can adjust the speed by adjusting the knob on the throttle valve of the Ningbo landing platform.