Cartridge valve with high firmness

The utility model relates to the technical field of cartridge valves, in particular to a cartridge valve with strong firmness, which comprises a valve core, a spring and a valve sleeve, the upper end of the valve core is connected with the valve sleeve in an embedded manner, and the spring is fixedly mounted at the upper end of the valve core. According to the utility model, the defects in the prior art are overcome, the sealing element and the dynamic seal are arranged, and the sealing element can improve the sealing performance between the valve core and the valve sleeve, so that oil is prevented from flowing back from a main oil way through the valve core when the oil way is cut off, the phenomenon of incomplete transmission is prevented, and the transmission stability is improved; the movable seal can enable hydraulic oil to be in a closed state, the overall sealing performance of the device is enhanced, oil leakage is prevented, unnecessary waste is reduced, the outer side of the cartridge valve is sleev