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We were discussing hydraulic flow control valves, pressure compensated flow control valves and non-pressure compensated flow control valves in our previous post, where we have seen the basic concept and application concept of flow control valves in hydraulic units. We have also seen the working principles of gate valve in our previous posts.

Today we will concentrate here the working principle of globe valve with the help of this post.  Globe valve is basically used in fluid pipelines for controlling the flow of fluid. There will be one disc in globe valve which will be called as valve plug of the globe valve and it will control the fluid flow.

There will be one handle wheel, as shown in figure, with valve which is used to open and close the globe valve. When handle wheel will be rotated, it will move the valve plug in upward or downward direction across the line of fluid flow.
Globe Valve
We can see here the figure of a globe valve, where we will come to know that there will be two section of globe valve. Bottom section will be connected with the inlet line and outlet line with the help of flanges and upper section of globe valve will consist with the valve plug and steam. Handle wheel and valve plug will be attached with this stem with the help of pin assemble or screw assemble.

Working mechanism of a globe valve

Working principle of globe valve is as displayed here in following figure. When handle wheel will be rotated in clockwise direction, steam and valve plug will move in downward direction across the fluid flow line and valve plug will be tightly located between the two valve seats. Hence there will not be any leakage of fluid through the valve once valve is closed completely.

Working mechanism of globe valve
When handle wheel will be rotated in anti-clockwise direction, steam and valve plug will move in upward direction across the fluid flow line and valve will be opened from closed position and will permit the flow of fluid through the globe valve.

We will discuss Needle valve working principle and applications in our next post.

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Image courtesy: Google

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