Small-flow high-pressure compact type balance valve

Abstract

The invention discloses a small-flow high-pressure compact type balance valve which comprises a balance valve body. A balance main valve, a buffer valve and a leading oil-way control system are integrated inside the balance valve body, a first main oil opening, a second main oil opening, an oil returning box opening and a control oil opening are formed in the balance valve body in a matched mode, two oil openings of the balance main valve are communicated with the first main oil opening and the second main oil opening respectively, two oil openings of the buffer valve are communicated with the second main oil opening and the oil returning box opening respectively, and the control input end of the leading oil-way control system is communicated with the control oil opening. A filter and a first damping are installed on the control input end in a series mode, the control output end of the leading oil-way control system is communicated with a control cavity of the balance main valve, and the control output end is formed by a tail port of a leading valve set composed of an adjustable throttling device, a forward direction one-way valve and a reverse direction adjustable one-way valve. A front port of the leading valve set is in tandem connection to an outlet of the first damping, the front port of the leading valve set is connected with a second damping, and the oil returning end of the second damping is communicated with the oil returning box opening.

Description

technical field [0001] The present invention relates to a hydraulic valve technology, in particular to a hydraulic balance valve used to control the movement of the long arm of a concrete pump truck and a concrete vehicle-mounted pump truck, specifically a compact balance valve with small flow rate and high pressure. Background technique [0002] In modern construction machinery, construction machinery and other engineering equipment, the hydraulic load-bearing system has become the main application object, and the balance valve is the key hydraulic component of this type of system, and its performance directly affects the performance of the whole machine. With the development of the national economy and the increasing difficulty of the current hydraulic machinery industry, as well as the customer's requirements for the performance and functional diversity of the balance valve have reached a new height. The hydraulic components of the balance valve in the prior art have reac...

AI Technical Summary

Problems solved by technology

The hydraulic components of the balance valve in the prior art have reached a considerable level of valve sealing and self-locking functions, but if this common balance valve is installed on a very long boom cylinder, some problems may often occur An unstable condition, which can be dangerous because it can cause the equipment to become uncontrollable and operate in an unsafe condition

The use of this balance valve will also cause the hydraulic cylinder to be damaged due to frequent impact and overload, thus greatly shortening the service life of the hydraulic cylinder.

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