Improved thin film pneumatic control valve

Abstract

The invention relates to an improved thin film pneumatic adjusting valve. The improved thin film pneumatic adjusting valve is characterized in that a valve element comprises a core located at an air inlet channel and an air outlet channel and a lower valve rod fixed below the core; the lower valve rod comprises a locating column penetrating out of a valve seat and a connecting rod located in the valve seat; a hemispherical upper balance part is arranged at the lower end of the core; a hemispherical lower balance part is arranged at the upper end of the locating column; the upper balance part and the lower balance part are arranged oppositely and connected with the connecting rod; and the size of the cross section of the locating column is larger than that of the cross section of the connecting rod. The improved thin film pneumatic adjusting valve has the beneficial effects that firstly, by means of the arrangement of the upper balance part and the lower balance part, smooth airflow is formed, and the valve element can be closed timely and accurately; secondly, the cross size of the connecting rod cannot be too large, the influence of steam impact force is avoided, it is further ensured that the valve element can be closed accurately, and air leaking is avoided; and thirdly, by means of the locating column, the valve element can be opened or closed stably, and swing is avoided.

Description

technical field [0001] The invention relates to an improved thin film pneumatic control valve. Background technique [0002] The single-seat pneumatic film regulating valve has the advantages of easy sealing and small leakage. It can well control the intake of steam when used in the steam inlet pipeline of equipment heated by steam. However, there is a defect of large unbalanced force when switching, which requires that the pressure difference is not too large during operation. The reason is: in the steam pipeline, when the steam passes through the steam at the inlet and outlet of the single-seat pneumatic film regulating valve, there is a large pressure difference, the valve core will not close properly, resulting in inaccurate heating temperature control and affecting production quality. [0003] Although the sleeve pneumatic film control valve and the double-seat pneumatic film control valve have small unbalanced force when switching, they are not affected by the steam p...

AI Technical Summary

Problems solved by technology

However, there is a defect of large unbalanced force when switching, which requires that the pressure difference is not too large during operation.

The reason is: in the steam pipeline, when the steam passes through the steam at the inlet and outlet of the single-seat pneumatic film regulating valve, there is a large pressure difference, the valve core will not close properly, resulting in inaccurate heating temperature control and affecting production quality.

[0003] Although the sleeve pneumatic film control valve and the double-seat pneumatic film control valve have small unbalanced force when switching, they are not affected by the steam pressure difference between the inlet and outlet of the valve, but the large leakage will affect the heating temperature control of the equipment during use. Accuracy

When the equipment needs to be cooled by water, steam leaks because the valve is not closed properly, which not only causes waste of steam, but also causes bursts of sound in the pipeline due to steam encountering cold water, and even causes the vibration of the pipeline to deviate from the original position, and the deviation of the pipeline will also cause Hazardous hazards of bursting valves and pipe elbows

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