LF10-00 Threaded cartridge throttle hydraulic valve power unit

   The solenoid valve is a step action direct pilot solenoid valve, which can be divided into normally closed solenoid valve and normally open solenoid valve according to the different opening and closing states when the power is off. Normally closed solenoid valve, after the coil is energized, the armature first drives the valve plug of the secondary valve under the action of electromagnetic force, and the fluid on the valve cup of the main valve flows away through the secondary valve, reducing the pressure on the valve cup of the main valve. When the pressure on the valve cup of the main valve is reduced to a certain value, the armature drives the valve cup of the main valve, and makes the valve cup of the main valve open by using the pressure difference, and the medium flows. When the coil is powered off, the electromagnetic force disappears and the armature resets due to its own weight.
At the same time, depending on the medium pressure, the main and secondary valves can be tightly closed. Normally open solenoid valve, after the coil is energized due to suction, the moving iron core moves down, the auxiliary valve plug is pressed down, the auxiliary valve is closed, the pressure in the main valve cup rises, when the pressure rises to a certain value, the upper and lower pressure difference of the main valve cup is like, due to the action of electromagnetic force, the moving iron core pushes the main valve cup down, compacts the main valve seat, and the valve is closed. When the coil is powered off, the electromagnetic suction is zero, the auxiliary valve plug and the moving iron core are lifted upward due to the action of the spring, the auxiliary valve is opened, and the main valve valve cup is opened

   The fluid flows through the auxiliary valve, reducing the pressure on the main valve cup. When the pressure on the main valve cup is reduced to a certain value, the pressure difference is used to push the main valve cup up, the main valve opens, and the medium flows.

Cartridge valve

The working principle and characteristics of cartridge valve
Cartridge valve is a kind of switch valve that uses small flow control oil to control large flow working oil. It is the main control component of the taper valve inserted in the oil block, so the name cartridge valve.

Cartridge valves are now mainly divided into two categories: the first type is the traditional cap plate cartridge valve, which appeared in the 1970s and is mainly used for high pressure and large flow occasions. Not suitable for small flow under 16 paths. Cartridge valve can not only realize various functions of ordinary hydraulic valve, but also has the advantages of small flow resistance, large flow capacity, fast operation speed, good sealing, simple manufacture, reliable operation and so on. The second type is the rapidly developed threaded cartridge valve on the basis of the safety valve in the multi-way valve of construction machinery, which just makes up for the lack of the cap plate cartridge valve that is not suitable for small flow, mainly for small flow occasions. The screw cartridge valve has various control functions, and the single component is inserted into the control block with the screw thread type, and the structure is very small and compact. In addition to the difference in the flow range, it has almost all the advantages of the cap plate cartridge valve, and can be widely used in various fields requiring hydraulic control of small flow.

Because of the simple structure, reliable work and high standardization of the cartridge valve, it is suitable for the integration of the hydraulic system, greatly reducing the pipeline connector and the leakage, vibration, noise and other faults caused by the pipeline, and can significantly reduce the size and quality of the large flow rate, high pressure and more complex hydraulic system.