A hydraulic oil inlet valve

Abstract

A hydraulic oil inlet valve disclosed by the present invention includes a working pipe, and a square valve groove is opened in the length direction of the working pipe, a spring and a valve body are arranged in the valve groove, a valve core is installed in the valve body, and the spring can push the valve core in the Movement within the valve body. Through the use of the pre-tightening screw and the spring, the opening and closing of the valve of the oil inlet valve is close to the pressure; when the pressure of the external hydraulic system connected to the oil inlet valve decreases, the pressure of the valve core adjustment port K of the corresponding oil inlet valve decreases. , the spring returns, the oil inlet is blocked and closed, and the hydraulic system stops liquid intake; when the pressure of the oil inlet valve exceeds the maximum pressure it can bear, the spring is pressed, the oil inlet P of the oil inlet valve opens, and the hydraulic system drains Pressure relief, to realize under-pressure and over-pressure protection of the hydraulic system, to ensure that the working fluid in the hydraulic system has normal working pressure.

Description

technical field [0001] The invention belongs to the technical field of pipeline hydraulic equipment, and in particular relates to a hydraulic oil inlet valve. Background technique [0002] The internal operation of the pipeline is usually connected by several working short joints with threads to form a hydraulic system, and then extended into the pipeline for operation. Among them, in order to ensure the normal internal working pressure of the hydraulic equipment, the hydraulic system should be equipped with an oil inlet valve when entering the liquid to protect the hydraulic system from overpressure and underpressure. However, in the face of the special structural constraints of the pipeline and the complex internal working environment, it is difficult to use the existing hydraulic valve as the oil inlet valve to meet the work requirements. [0003] Due to the slender structure and diameter limitation of the pipeline, it is difficult for the existing hydraulic valve struct...

AI Technical Summary

Problems solved by technology

However, in the face of the special structural constraints of the pipeline and the complex internal working environment, it is difficult to meet the work requirements with the existing hydraulic valve as the oil inlet valve

[0003] Due to the slender structure and diameter limitation of the pipeline, the existing hydraulic valve structure is difficult to enter the pipeline with the screw drilling tool

At the same time, when working in pipelines, hydraulic equipment often faces high temperature or high pressure conditions, such as the high temperature environment in the chimney pipeline of a steel mill, the high pressure environment in a natural gas pipeline; Deformation; such as the safety valve of the cylindrical helical compression spring, the cylindrical helical compression spring cannot provide enough pressure under high pressure conditions, and will deform under high temperature conditions to change the preset critical pressure of the safety valve, losing its role as oil inlet The basic protection function of the valve

[0004] The working fluid of the pipeline robot hydraulic system has a long transportation distance in the pipeline, and the design of the oil circuit is complicated. Therefore, the pumping pressure of the working fluid is high and the flow rate is fast. Power, the design structure of the ordinary hydraulic oil inlet valve is difficult to move the valve core normally under the action of hydraulic power, which affects the opening and closing of the oil inlet valve

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