Load sensing proportional multiway valve with load pressure duplication

Abstract

The invention belongs to the technical field of hydraulic multiway valves, and in particular, relates to a load sensing proportional multiway valve with load pressure duplication. In order to solve the problems of bad flow loss and influence on load signals in a LS loop by logic control in a traditional multiway valve, the invention provides the load sensing proportional multiway valve with load pressure duplication. The load sensing proportional multiway valve with load pressure duplication comprises a main valve, a shuttle valve, a pressure compensation valve, a pressure duplication valve, a pilot pressure reducing valve and a main safety valve; and after the load signals are compared through the shuttle valve, the load signals are acted on a valve element of the pressure duplication valve, and duplicated pressure signals are transferred to a LS port of a pump. The load sensing proportional multiway valve with load pressure duplication is provided with the pressure duplication valve for logically controlling the load signals to accelerate the system response speed; and the LS signals consume no oil in the working oil port, so that the flow loss is reduced, and the energy utilization rate is increased.

Description

technical field [0001] The invention belongs to the technical field of hydraulic multi-way valves, and in particular relates to a load-sensitive proportional multi-way valve with load pressure replication. Background technique [0002] With the continuous development of modern hydraulic technology and the improvement of field requirements, mechanical products are developing in the direction of precision and energy saving. The hydraulic system using load-sensing technology reduces the number of speed-regulating valve components, has a high degree of integration, and can realize stepless adjustment of the speed of system actuators, and the adjustment is accurate, the process is stable, and the energy loss is small. Therefore, it is used in construction machinery, mining equipment, etc. field has been widely used. [0003] At present, the most commonly used load-sensing multi-way valve in China obtains the load signal from the working oil port, compares the maximum load signal...

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Problems solved by technology

[0003] At present, the most commonly used load-sensing multi-way valve in China obtains the load signal from the working oil port, compares the maximum load signal through the shuttle valve, and directly transmits it to the LS port of the pump. Due to the oil discharge of the LS regulator of the pump, many There is always a flow loss of 1-2L / min at the working oil port of the multi-way valve; in addition, when logic control is required in the LS circuit, it will affect the load signal of the existing multi-way valve

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