Gate valves are used for various applications for starting or stopping the fluid flow but are not generally used for regulating or throttling the flow. The name of gate valves comes from the appearance of discs present in the flow stream. There are different types of gate valves and one of the most used types is the non-rising stem gate valve, no vertical movement happens. These valves can be used in less available space. Continue reading this blog to explore more about non-rising stem gate valves.
What are non-rising stem gate valves?
Non-rising gate valves’ construction is in such a way that the stem is completely opened when the handle gets rotated to the far possible left position and completely closed when the handle rotation takes place to the far possible right. In both scenarios, the handle is flushed with the pipes. The reason for this is due to the mechanism present inside the pipe closing & opening the gate valves but without raising the stem. One of the biggest advantages of non-rising stem gate valves is – they take little space for operation. As the height of these valves stays the same therefore the installation needs less room and is apt for limited installation space applications. Non-rising stem gate valves are generally equipped with a closed or open indicator.
What are the differences between non-rising stem gate valves and rising stem gate valves:
The gate valves are divided according to the type of stem and can be classified into two types. Let us have a look at the differences between these valves:
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In terms of appearance and structure
The structure of non-rising stem gate valves is – the stem nut is present in the body of the valves and is in direct contact with the specific medium while closing or opening the gate and can realise through rotation of the stem. The rising stem gate valves’ structure is – the stem nut is present on the bracket or bonnet. Whether the gate valves are opened or closed can be seen from the appearance of rising stem gate valves but in the case of non-rising gate valves, we can not see the lead screw.
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Difference in the mode of transmission
When we talk about the transmission mode of non-rising stem gate valves, the handwheel helps drive the stem for rotation. Here, the stem and the handwheel are connected together and are immovable whereas the transmission mode of rising stem gate valves is – the handwheel helps in driving the nut for rotation, and the stem is raised linearly.
Conclusion
We hope you have enjoyed reading this blog about non-rising stem gate valves. Non-rising stem valves are one of the most used valves in various applications. They take up very less space as compared to rising stem gate valves and are best for limited space applications. You can get in touch with one of the reliable suppliers of non-rising stem gate valves.
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