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挖掘机上的压力传感器是挖掘机系统的核心部件，用于液压控制，在挖掘机不断的启停，挖掘过程中，压力传感器会承受很大的压力，所以说传感器的耐压，以及重复性很重要；

一台好的挖掘机可以连续升降几十万次，国产很多挖掘机大厂，像徐工、三一重工都用日本长野计器的压力传感器，包括世界上的挖掘机，神钢，卡特彼勒都是用长野NKS的。

其实国产的压力传感器挺不错的，中国的炼钢技术太落后，根本生产不出高强度，高可靠性的材料，所以对于挖掘机这种重型机械来说，一辆少几十万，都是用进口的传感器。

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700-92-34000-YA CONTROL VALVE1、挖掘机在冬季起动为什么困难？不仅决定于本身的技术状况，还受外界气温的影响。冬季低温下起动更困难，主要是由如下原因所致：
⑴冬季气候寒冷，环境温度低，机油粘度增大，各运动机件的摩擦阻力增加，使起动转速降低，难以起动。
⑵蓄电池容量随温度下降而减少，使起动转速进一步降低。
⑶由于起动转速降低，压缩空气渗漏增多，气缸壁散热量增大，致使压缩终了时空气的温度和压力大为降低，使柴油发火的延迟期增长，严重时甚至不能燃烧。

⑷低温下的柴油粘度增大，使喷射速度降低，加上空气在压缩终了时的旋流速度、温度和压力都比较低，使喷入气缸的柴油雾化质量差，难以与空气迅速形成良好的可燃气体并及时发火燃烧，甚至不能着火，导致起动困难。