Four-functional valve

Abstract

The invention relates to a valve, particular to a four-functional valve, wherein the body of the valve is provided with an upper blind hole and a lower blind hole; the lower blind hole is respectively connected to a first central hole arranged on an exhaust sampling valve and a second central hole arranged on a backpressure check valve; the upper blind hole is connected to a third central hole arranged on the backpressure check valve; the body of the valve is provided with a sampling port; the sampling port is connected to a drainage hole arranged on the exhaust sampling valve; the first central hole is connected to the sampling port 14 through a first sealing cavity formed by a first concentric annular boss and a first diaphragm; and the second central hole is connected to the third central hole through a second sealing cavity formed by a second concentric annular boss and a second diaphragm. In the invention, the safety valve, the sampling valve, the vent valve and the backpressure valve are integrated, which not only achieves the function required by a liquid-adding pipeline for user but also greatly relieves the difficulty of mounting and maintaining the pipeline. Besides, the four-functional valve is convenient and easy to operate, has low cost and is specially fit for high-pressure and low-flux liquid-medicine adding pipeline.

Description

technical field [0001] The invention relates to a valve, in particular to a four-function valve. Background technique [0002] In the pharmaceutical, chemical, food, water treatment and other industries, in the process of mixing liquid and liquid according to a certain ratio or quantitative dosing of liquid and mixing of solid medicine, in order to prevent pipelines and pumps from bursting and other damage due to artificial or accidental blockage (if cast Adding flammable, explosive or highly toxic liquids will have more serious consequences), generally a safety valve must be installed, the function of the safety valve is when the pipeline pressure exceeds a certain pressure The liquid automatically pushes away the spring, and flows back through the bypass for pressure relief to protect the pipeline and the pump; in order to detect the composition or quality of the liquid in the dosing pipeline, so that measures can be taken in time to solve the problem, sampling must be set...

AI Technical Summary

Problems solved by technology

[0002] In the pharmaceutical, chemical, food, water treatment and other industries, in the process of mixing liquid and liquid according to a certain ratio or quantitative dosing of liquid and mixing of solid medicine, in order to prevent pipelines and pumps from bursting and other damage due to artificial or accidental blockage (if cast Adding flammable, explosive or highly toxic liquids will have more serious consequences), generally a safety valve must be installed, the function of the safety valve is when the pipeline pressure exceeds a certain pressure The liquid automatically pushes away the spring, and flows back through the bypass for pressure relief to protect the pipeline and the pump; in order to detect the composition or quality of the liquid in the dosing pipeline, so that measures can be taken in time to solve the problem, sampling must be set at a suitable position Valve, when the pump is just started, due to the large amount of air in the pipeline, the dosage will be inaccurate, and some liquid medicine will chemically react with the air, so it is generally considered to set an exhaust valve in the pipeline to allow the liquid to pass through Compress the air so that the air is discharged from the exhaust valve; in order to prevent liquid backflow and siphon, a back pressure check valve must be installed at a suitable position; and the setting of many valves and bypasses in the pipeline will bring great inconvenience to pipeline installation and maintenance. It is very inconvenient, and the cost is also very high, and it also brings great inconvenience to the daily operation of the operator

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