Constant pressure valve for controlling pressure and flow of variable plunger pump

Abstract

The invention relates to a constant pressure valve for controlling the pressure and the flow of a variable plunger pump. The constant pressure valve is characterized in that a valve body is internally provided with a first sliding valve and a second sliding valve; the right part of the valve body is provided with a first nut and a second nut which are connected in a matching way, the first nut is provided with a first adjusting screw rod, and the second nut is internally provided with a second screw rod; the right end of the first sliding valve is connected with a first spring base, the left end of the first adjusting screw rod is connected with a second spring base, and a first spring component is arranged between the first spring base and the second spring base; the right end of the second sliding valve is connected with a third spring base, the left end of the second adjusting screw rod is connected with a fourth spring base, and a second spring component is arranged between the third spring base and the fourth spring base; an oil inlet passage, an oil outlet passage and an adjusting oil passage which are arranged in the valve body are all communicated with valve cavities of the first sliding valve and the second sliding valve, and a throttling pin is arranged in a damping hole which is formed in the adjusting oil passage. According to the constant pressure valve disclosed by the invention, the pressure and the flow of the variable plunger pump can be controlled, the pressure can be maintained to be constant, the energy utilization rate can be increased, and the energy consumption can be reduced.

Description

technical field [0001] The invention relates to a hydraulic component, in particular to a constant pressure valve for pressure and flow control of a variable displacement plunger pump. The valve is used on the variable displacement plunger pump, which can realize the pressure and flow control of the variable displacement plunger pump. Background technique [0002] In the traditional hydraulic system, the relief valve overflow method is often used to maintain a constant system pressure. Due to the pressure loss, the heat generation is serious and the energy loss is large. As the world's energy crisis is becoming more and more serious, it is very important to improve the energy utilization efficiency of the hydraulic system and reduce energy loss. CN 201575207 U discloses "a constant pressure valve capable of maintaining constant pressure of water flow", comprising a valve body, the valve body is provided with a spool chamber, a water inlet and a water outlet, and a channel i...

AI Technical Summary

Problems solved by technology

The constant pressure valve has the characteristics of small size, light weight, simple and reasonable structure, convenient installation and use, etc., and the pressure stability behind the valve is good, but it cannot control the pressure and flow of the variable displacement plunger pump.

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