Part number 2254558 225-4558 valve assembly - electromagnetic and pressure reducing valves for excavators 336E LN 336D2 352F 568 FM 345C L 349E L.

Part No. 2254558 225-4558 Valve Assembly - Electromagnetic and Pressure Reducing Valves for Excavators 336E LN 336D2 352F 568 FM 345C L 349E L

In excavators, "electromagnetic" and "pressure reducing" typically refer to key components in the hydraulic system—solenoid valves and pressure reducing valves. They work together to achieve precise control over the flow direction, pressure, and volume of hydraulic oil.

Solenoid valves use electromagnetic force to control the on/off state or flow direction of hydraulic oil. In excavators, there are various types of solenoid valves. Pilot-locking solenoid valves manage all vehicle movements; their stability directly affects operating efficiency and safety.

Pressure reducing valves are used to reduce the pressure in high-pressure oil circuits to the required value and maintain stability. For example, in an excavator's pilot system, an electromagnetic proportional pressure reducing valve reduces the pilot oil pressure according to an electrical signal from the controller, generating power shift pressure (PS), which is then sent to the main pump regulator. If the pressure reducing valve malfunctions (such as downstream pressure fluctuations or no pressure), it may be due to a clogged filter, a ruptured diaphragm, or a loose pressure adjusting screw, requiring specific troubleshooting.