Take the old pump nameplate first 先拍旧泵铭牌
The fastest way to start replacement selection is to send a clear photo of the old pump nameplate. 替换选型最快的方式，是先发送旧泵铭牌清晰照片。
The nameplate usually helps confirm model, pumping speed, motor power, voltage and frequency. 铭牌通常可以帮助确认型号、抽速、电机功率、电压和频率。
Check installation and connection 确认安装和接口
Even if pumping speed is similar, inlet size, outlet size, base dimensions and motor position may affect installation. 即使抽速接近，进出口尺寸、底座尺寸和电机位置也可能影响安装。
Send installation photos if the pump is inside a machine cabinet or has limited space around it. 如果泵在设备柜内，或周围空间有限，请发送现场安装照片。
Confirm the real problem before buying 购买前确认真实问题
Low vacuum may come from pump wear, oil condition, filter blockage, leakage or process change. 真空不足可能来自泵磨损、油品状态、过滤器堵塞、系统漏气或工艺变化。
If you are not sure whether the pump must be replaced, describe the problem before ordering. 如果不确定是否必须换泵，请先描述故障现象，再确认采购。