# Instrument and process equipment symbols

**URL:** <https://forumautomation.com/t/instrument-and-process-equipment-symbols/2357>\
**Category:** Instrumentation\
**Tags:** interviewquestions\
**Created:** [September 28, 2017, 3:13pm UTC](https://forumautomation.com/t/instrument-and-process-equipment-symbols/2357 "2017-09-28T15:13:14Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sivaranjith](https://forumautomation.com/letter_avatar_proxy/v4/letter/s/ba9def/32.png) [@sivaranjith](https://forumautomation.com/u/sivaranjith)\
**Post date:** [September 28, 2017, 3:13pm UTC](https://forumautomation.com/t/instrument-and-process-equipment-symbols/2357/1 "2017-09-28T15:13:15Z")

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The instrument symbols are as per ISA 5.1 standards, which are applicable in Process Flow Diagrams (PFDs), Process and Instruments, Diagrams (P&IDs), and loop diagrams

## **Line types:**

 ![](https://cdn.forumautomation.com/original/1X/7c7c210c2c6c935eade02b0ad85549494890c16f.png)

## Bubble type:

 ![](https://cdn.forumautomation.com/original/1X/637f60f7b58c5fe820d008d2fc4afb9a68814b6d.png)

## Process valve type:

 ![](https://cdn.forumautomation.com/original/1X/eea7ef0ad7b52f1545bc13c3337b374dbcb5df17.png)

## Valve actuator type:

 ![](https://cdn.forumautomation.com/original/1X/d77f1aeb2ecfdca739a24fee7bf45f5208f6dabc.png)