# \#flow

**URL:** https://forumautomation.com/tag/flow/38.md

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## [Basics of Needle valves & applications](https://forumautomation.com/t/basics-of-needle-valves-applications/3178)

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**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\
**Replies:** 0\
**Last updated:** [February 23, 2018, 2:57pm UTC](https://forumautomation.com/t/basics-of-needle-valves-applications/3178 "2018-02-23T14:57:53Z")

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Needle valves are used to control the flow precisely. In the needle valve, the long, tapered, needle-like point on the end of the valve stem acts as the disk in usual valves, which perfectly fits into the seats.This arra…

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## [Piezoelectric (PZT) actuators basics](https://forumautomation.com/t/piezoelectric-pzt-actuators-basics/3153)

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**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\
**Replies:** 0\
**Last updated:** [February 17, 2018, 2:27pm UTC](https://forumautomation.com/t/piezoelectric-pzt-actuators-basics/3153 "2018-02-17T14:27:45Z")

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An actuator is a device that converts the input electrical signal into mechanical energy. Various actuators have been developed and put to practical use according to various types of input energy, for example there are e…