393000M024 Excavator hydraulic pump solenoid valve proportional solenoid valve 3768317

The difference between electric proportional valve and solenoid valve

Valve control of flow can be divided into two types:
 

     One is switch control: either fully open or fully closed, the flow rate is either maximum or minimum, there is no intermediate state, such as ordinary electromagnetic through valve, electromagnetic reversing valve, electro-hydraulic reversing valve. The other is continuous control: the valve port can be opened according to the need of any degree of opening, thereby controlling the size of the flow through, such valves have manual control, such as throttle valves, but also electronically controlled, such as proportional valves, servo valves. So the purpose of using proportional valve or servo valve is: to achieve the flow control by electronic control (of course, after structural changes can also achieve pressure control, etc.), since it is throttling control, there must be energy loss, servo valve and other valves are different, its energy loss is greater, because it needs a certain flow to maintain the work of the pre-stage control oil circuit.
Electromagnetic valve (Electromagnetic valve) is the use of electromagnetic

Working principle of proportional solenoid valve
   

  Electro-hydraulic proportional valve is the proportional electromagnet input voltage signal in the valve to produce corresponding action, so that the working valve spool displacement, valve port size change and complete the pressure and flow output components proportional to the input voltage. Spool displacement can also be fed back mechanically, hydraulically or electrically. Electro-hydraulic proportional valve has a variety of forms, easy to use electrical and computer control of various electro-hydraulic systems, high control accuracy, flexible installation and use, and strong anti-pollution ability, and other advantages, the application field is expanding. In recent years, the development and production of plug-in proportional valves and proportional multiway valves fully consider the characteristics of construction machinery, with pilot control, load sensing and pressure compensation functions. It is of great significance to improve the overall technical level of mobile hydraulic machinery.