Hydraulic multichannel conversion valve

Abstract

The invention relates to a hydraulic multi-channel conversion valve which consists of a left driving valve and a right driving valve; the driving valve comprises a driving valve body and a valve core, and is characterized in that: the driving valve body is provided with an overload protection valve which is connected with the oil inlet port and the oil outlet port of the valve body; the overload protection valve comprises a main valve body, an auxiliary valve body, a valve needle and a one-way valve core; the back end of the main valve body is connected with the auxiliary valve body by a screw; the valve needle is arranged in the inner cavity of the auxiliary valve body; the back end of the valve needle is sleeved with a reset spring; a cone valve needle is contacted with an oil hole at the front end of the auxiliary valve body; the front end of the one-way valve core is provided with a circular hole; the circular hole is matched with a throttle valve core in a sliding way; the back end of the throttle valve core provided with a throttle hole arranged in the center is provided with a spring; and a pressure release cavity is formed between the front end of the auxiliary valve body and the inner cavity of the one-way valve core. The conversion valve has the advantages that: the micro-motion effect is realized; as the overload protection valve is increased, the instant high pressure which is transmitted by working systems is opened before the relief valve of the system is unloaded, thereby removing the peak pressure, effectively protecting the hydraulic parts and structural parts from encountering destructive attack.

Description

technical field

[0001] The invention belongs to a hydraulic multi-way valve, in particular to a hydraulic multi-way reversing valve applied to an engineering machinery operating system. Background technique

[0002] Hydraulic multi-way valve is the main component used in the main oil circuit control system of small excavators, drilling rigs and other construction machinery. The hydraulic multi-way valve is composed of left and right driving valves, and each group of valves is composed of five parts: walking, breaking hammer, bucket, boom, and stick. . The multi-way valve is controlled by a manual decompression pilot valve, and the control oil of the manual decompression valve pilot valve is supplied by a gear pump alone to form a control circuit. Manipulating the position of the pilot valve handle and different directions can make the output pressure change in the pressure range of 0-4Mpa to control the opening and reversing of the hydraulic multi-way valve, so that the dr...

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