Small-flow high-pressure load sensitive proportional multi-way valve

Abstract

The invention discloses a small-flow high-pressure load sensitive proportional multi-way valve which comprises a pump oil inlet control, a tail control and basic controls which are arranged between the pump oil inlet control and the tail control. The number of the basic controls can be increased and decreased, a pressure oil opening and an oil returning opening are formed in the pump oil inlet control, and an unloading oil opening is formed in the tail control, a first working oil opening and a second working oil opening are formed in each basic control, and a load feedback opening, a pump output pressure testing opening, a reducing valve output opening, a main overflow valve, a two-position two-way electromagnetic valve, a damper and a reducing valve are arranged in the pump oil inlet control in an equipped mode. A manipulating valve core, a two-way flow controller, a pressure selection valve and a two-way proportional electromagnetic reducing valve are integrated in each basic control, and the pump oil inlet control, the basic controls and the tail control are fixedly assembled together by adopting a double-end stud stacking type. The small-flow high-pressure load sensitive proportional multi-way valve is compact in structure, high in energy utilization rate, stable in motion, high in response speed, and capable of effectively removing pressure impact in a hydraulic pipeline, improves operation performance of the system and is particularly suitable for being used in various variable pump systems of engineering mechanical devices.

Description

technical field [0001] The invention relates to the technical field of hydraulic systems, in particular to a proportional multi-way valve used in variable pump systems in various construction machinery equipment, specifically a load-sensitive proportional multi-way valve with small flow and high pressure. Background technique [0002] At present, the hydraulic systems of various domestic construction machinery and equipment, such as hydraulic systems in cranes, concrete pump trucks, logging equipment and aerial work vehicles, can be divided into variable pump systems and quantitative pumps according to the type of pump used in the system. system. Due to the different systems, the multi-way valves selected are also different. For quantitative pump systems, you can choose ordinary multi-way valves or proportional multi-way valves suitable for quantitative pump systems to meet the working requirements of the system. But for the variable pump system, if the above two valves ar...

AI Technical Summary

Problems solved by technology

But for the variable pump system, if the above two valves are used, it will show obvious defects

During the reversing process of ordinary multi-way valves, the hydraulic impact force is relatively large, which is not conducive to the stability of the system and equipment installation. Moreover, the energy utilization rate of ordinary multi-way valves is low and the power loss is large.

However, although the proportional multi-way valve suitable for quantitative pump systems has a small impact force and relatively stable action during the reversing process, the flow provided by the pump is often greater than the flow required by the system, thus causing a lot of waste. Therefore, the above two valves cannot play the best performance in the variable pump system.

Images