Check valve symbol
Also called Non-return valve, NRV
A check valve lets fluid flow one way only. Installed the wrong way round it blocks the line, so its direction is checked on site.
What the check valve symbol means
A check valve lets fluid flow one way only. Installed the wrong way round it blocks the line, so its direction is checked on site.
How it is drawn
The valve body with one triangle filled. Flow goes from the open side towards the filled side.
Isometric SVGWhere you see it
Pump and compressor discharges and lines feeding a common header.
What is written next to it
On the isometric, the check valve usually carries the valve tag, an item number and the flow direction.
What gets checked on site
For a check valve, the site checks usually cover the flow direction against the isometric and the arrow on the body. Each check is recorded against the line and the joint, so the line can go into its test pack and be handed over with its evidence. See the ITR guide.
Related symbols
Frequently asked questions
What does the check valve symbol look like?
The valve body with one triangle filled. Flow goes from the open side towards the filled side.
Where is a check valve used?
Pump and compressor discharges and lines feeding a common header.
- In production since 2014
- Thousands of daily users
- On MODEC FPSO projects since 2016