Excavator solenoid valve 154-3064 hydraulic pump proportional solenoid valve

       The electro-hydraulic proportional valve is the proportional electromagnet input voltage signal in the valve to produce the corresponding action, so that the working valve spool displacement, the valve port size changes and completes 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. In particular, electronic control pilot operation, wireless remote control and wired remote control operation have shown good application prospects. 2 Types and forms of electro-hydraulic proportional valves for construction machinery Electro-hydraulic proportional valves include proportional flow valves, proportional pressure valves and proportional directional valves. Hydraulic operation characteristics of construction machinery, electrohydraulic proportional valves are divided into two main categories in the form of structure: One is the spiral cartridge type proportional valve, the other is the slide valve type proportional valve, the spiral cartridge type proportional valve is threaded electromagnetic proportional cartridge parts fixed on the oil circuit integrated block components, spiral cartridge valve has the characteristics of flexible application, pipe saving and low cost, etc., in recent years, the application of more and more widely used in construction machinery. Commonly used spiral cartridge type proportional valve has two, three, four and multi-pass forms, two-way proportional valve main proportional throttle valve, it often its components together to form a composite valve, the flow, pressure control; The three-way proportional valve is the main proportional pressure reducing valve, which is also the most used proportional valve in the mobile mechanical hydraulic system, and the main hydraulic operation of the multi-way valve pilot oil path operation. The three-way proportional pressure reducing valve can replace the traditional manual pressure reducing pilot valve, which has more flexibility and higher control accuracy than the manual pilot valve