A multifunctional valve and its combination valve

Abstract

The invention relates to a multifunctional valve and a combination valve thereof. The multifunctional valve comprises a valve body, a valve cavity formed in the valve body and a valve rod arranged in the valve cavity, wherein a middle inlet allowing pressure media to enter, a left inlet and a right inlet are formed in one surface of the valve body, and the pressure media can selectively enter the left inlet and the right inlet; a left outlet and a right outlet which allow the pressure media to be discharged are formed in the other surface of the valve body; and the left inlet and the left outlet as well as the right inlet and the right outlet are selectively and correspondingly communicated through matching of the valve cavity and the valve rod. The multifunctional valve is characterized in that the left inlet and the right inlet are communicated with the left outlet and the right outlet through respective damping channels, so that a piston can slowly touch the end part of a piston cylinder, a piston rod is prevented from being collided and abraded when the piston moves at a high speed, the service life of the piston cylinder is effectively prolonged, and simultaneously, operation safety and stability of the piston cylinder are guaranteed.

Description

technical field [0001] The invention relates to the technical field of buffer valves and related valve groups. Background technique [0002] When the piston cylinder works at high speed or high pressure, the movement speed of the piston rod and the piston is very fast. In this way, when the piston quickly moves to the two limit positions of the front end and the rear end of the cylinder body, the piston and the end cover of the cylinder body will inevitably be closed. Collision. Not only can it produce a lot of collision noise, but it will inevitably cause serious wear and tear on the piston and the end cover of the cylinder block. After using for a period of time, it will inevitably cause certain damage to the piston and the end cover of the cylinder body; the higher the pressure, the faster the speed, and the shorter the service life of the piston cylinder. [0003] Although the inventor disclosed an improved combination valve in the document of a multi-function valve an...

AI Technical Summary

Problems solved by technology

Not only can it produce a lot of collision noise, but it will inevitably cause serious wear to the piston and cylinder end cover

After being used for a period of time, it will inevitably cause certain damage to the piston and the end cover of the cylinder body; the higher the pressure, the faster the speed, and the shorter the service life of the piston cylinder

[0003] Although the inventor disclosed an improved combination valve in the document of a multi-function valve and its combination valve in 201110398070.3 to prevent the piston from impacting the cylinder end cover, thereby prolonging the service life of the piston cylinder, in practice It shows that there are still some deficiencies in some applications. For example, the working time sequence of the two cylinders is different, which will cause the fluid pressure in one cylinder to affect the fluid pressure in the other cylinder, which is to produce certain mutual interference. As a result, the cylinder pistons controlled by each reversing control valve cannot work well in sequence, and further improvement is required

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