原文：
问题一：计量泵出口没有压力的情况下， 泵的实际流量比额定流量大很多，而且调节流量时，流量基本没有变化。 解决方法：在计量泵出口增加背压阀,背压阀在稳定管路压力的同时，可以稳定计量泵的流量，保证计量精度。 问题二：开泵后，出口管路震动比较厉害。 解决方法：在计量泵出口安装脉冲阻尼器（如果计量泵出口没有压力，{zh0}和背压阀同时使用）；排出端流体由于惯性阻力，在泵运行开始瞬间，会对管路产生脉动撞击力。这是 往复式泵的特有现象，是由于管道内液体受到突然加速而引起的。脉冲阻尼器能够有效防止脉冲引起的管路震动。

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译文：
Question one: there is no metering pump under pressure, the pump's actual flow rate much larger than the rated flow, but also regulates the flow, the flow rate unchanged. Solution: increase the back pressure in the measurement of pump discharge valve, back pressure valve in a stable pipeline pressure, can stabilize the flow metering pump to ensure the measurement accuracy. Problem 2: Open the pump, the more powerful of pipeline vibration. Solution: Install in the measurement of pump pulse damper (if no pressure metering pump, the best and the back pressure valve at the same time use); discharge end of fluid inertia resistance, the pump started running the instant pulse of impact force would produce pipes . This is a unique phenomenon of reciprocating pump is due to the liquid inside the tubes caused by sudden acceleration. Pulse pulse damper can effectively prevent the vibrations caused by the pipeline.