TM70301 proportional solenoid valve hydraulic pump excavator accessories

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 wood formation, 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 main proportional throttle valve, it often its components together to form a composite valve, the flow, pressure control; Three links
The proportional valve is the main proportional pressure reducing valve, which is also the most used proportional valve in the mobile mechanical hydraulic system, which mainly operates the hydraulic multiway valve pilot oil circuit. 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. With 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 can be individually controlled for the working device.
The slide valve type proportional valve, also known as the distribution valve, is one of the most basic components of the mobile mechanical hydraulic system, which can realize the direction and flow regulation of the composite valve.
Electro-hydraulic slide valve proportional multiway valve is a relatively ideal electro-hydraulic conversion control element, it retains the basic function of manual multiway valve, but also increases the position of the electric feedback proportional servo operation and load sensing and other advanced control means, it is the construction machinery distribution valve replacement products.
Due to manufacturing cost considerations and construction machinery control accuracy requirements are not high characteristics, the general proportional multi-way valve is not equipped with displacement sensor, with electronic detection and error correction functions. The displacement of the spool is easily affected by pressure fluctuations caused by load changes, and visual observation is required to ensure the completion of the operation during the operation. Electronic control, remote control operation should pay more attention to the influence of external interference. Recently, with the development of electronic technology, people are using more and more internal packaging
Displacement sensors such as dynamic transformer (LDVT) are used to detect the movement of spool position and realize the closed-loop control of spool displacement. This highly integrated proportional valve consists of a solenoid proportional valve, a position feedback sensor, a drive amplifier and other electronic circuits