Excavator parts 328-4314 C7 Solenoid valve for Carter 962H 962K 966H 972H

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. According to the characteristics of hydraulic operation of construction machinery, there are two types of electro-hydraulic proportional valves: one is spiral cartridge proportional valves, and the other is slide valve proportional valves.

The spiral cartridge valve is a component that fixed the electromagnetic proportional cartridge on the oil circuit assembly block through the thread. The spiral cartridge valve has the characteristics of flexible application, pipe saving and low cost, etc. It has been used more and more widely in construction machinery in recent years.
Commonly used spiral cartridge type proportional valve has two, three, four and multi-pass forms, two-way proportional valve is mainly proportional throttle valve, it is often combined with other components to form a composite valve, flow, pressure control; The three-way proportional valve is mainly a proportional pressure reducing valve, and it is also a proportional valve used more in mobile mechanical hydraulic system, which is mainly to operate the pilot oil circuit of the hydraulic multi-way valve.

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. It can be made into a proportional servo control manual multi-way valve as shown in Figure 1. According to different input signals, the pressure reducing valve makes the output piston have different pressure or flow rate to achieve proportional control of the displacement of the multi-way valve spool. Four-way or multi-way screw cartridge proportional valves allow individual control of the working device.