E330C main relief valve 103-8177 Excavator accessories proportional solenoid valve

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. The hydraulic operation characteristics of construction machinery are divided into two types of electro-hydraulic proportional valves in the form of structure: one is spiral cartridge proportional valves, and the other is slide valve proportional valves.
The screw cartridge proportional valve is a threaded electromagnetic proportional cartridge component fixed on the oil circuit assembly block. The screw cartridge valve has the characteristics of flexible application, pipe saving and low cost, and has been used more and more in construction machinery in recent years
Extensive. 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; Three way ratio
The main proportional pressure reducing valve is also the most used proportional valve in the mobile mechanical hydraulic system, which mainly operates the hydraulic multiway valve pilot oil circuit. The use of three-way proportional pressure reducing valve can replace the traditional manual decompression first
Pilot valve, which has more flexibility and higher control accuracy than manual pilot valve. It can be made into a proportional servo control manual multi-way valve as shown in Figure 1. Different input signals, the pressure reducing valve makes the output piston have different pressure or flow
Then it realizes the proportional control of the displacement of multi-way valve spool. Four-way or multi-way screw cartridge proportional valves can be individually controlled for the working device.