A cartridge type overload oil supplement valve

Abstract

The invention discloses a plug-in mounting type overload oil supplementing valve. The plug-in mounting type overload oil supplementing valve comprises a valve body provided with an oil port P, and a valve seat connected in the valve body in a sliding manner. The valve seat is internally provided with a through hole A arranged in the axial direction of the valve seat. The part, between the oil portP and the valve seat, of the valve body is internally provided with a first spring forcing the valve seat to get away from the oil port P. The valve body is internally provided with a hollow thread sleeve used for limiting disengaging of the valve seat from the valve body. The thread sleeve is provided with an oil port T matched with the oil port P. The thread sleeve is internally in sliding connection with a valve element, a second spring forcing the valve element to move towards the through hole A, and an adjusting rod used for adjusting the pre-tightening force of the second spring. The thread sleeve is internally further provided with a circular bead A matched with the valve element to achieve the limiting function. The valve element is provided with an oil passing hole, and accordingly, the oil pressure of the oil port T acts on the upper end face of the valve seat. The valve is simple in structure, convenient to machine and capable of rapidly buffering the impact pressure and rapidly supplementing oil.

Description

technical field [0001] The invention relates to the technical field of hydraulic valves, in particular to a plug-in overload oil supply valve. Background technique [0002] At present, most of the domestically produced and used valves used for overpressure relief and negative pressure replenishment for hydraulic components such as oil cylinders have two structural modes, one is the combination of overload relief valve and negative pressure replenishment valve separately set The other is a cartridge valve with an overload relief valve with a pilot valve and a negative pressure oil supply valve integrated. Both valves can play the role of overload protection and negative pressure oil supply; The valve bodies are set separately, which are large in size and use a lot of materials, and the application is limited by the use of space because of the large volume; although the latter integrates the overload overflow and oil replenishment in one valve body, it solves the problem of la...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the domestically produced and used valves used for overpressure relief and negative pressure replenishment for hydraulic components such as oil cylinders have two structural modes, one is the combination of overload relief valve and negative pressure replenishment valve separately set The other is a cartridge valve with an overload relief valve with a pilot valve and a negative pressure oil supply valve integrated. Both valves can play the role of overload protection and negative pressure oil supply; The valve bodies are set separately, which are large in size and use a lot of materials, and the application is limited by the use of space because of the large volume; although the latter integrates the overload overflow and oil replenishment in one valve body, it solves the problem of large volume and high material consumption. However, since the overload relief requires the pilot valve to push the main relief spool, this structure will cause the overload relief to respond slowly and the action is not sensitive enough

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