Needle valve symbol
A needle valve has a long tapered needle that gives very fine flow adjustment. It is used on small lines where flow has to be set precisely.
What the needle valve symbol means
A needle valve has a long tapered needle that gives very fine flow adjustment. It is used on small lines where flow has to be set precisely.
How it is drawn
The two-triangle valve body with a stem and a downward-pointing solid triangle above it, standing for the needle.
The needle valve symbol in each standard
Drawn as on most US-style legend sheets.
Valve, needle type. A small solid wedge points down onto the centre of the body.
ISO SVG
German (DIN): Nadelventil. See DIN P&ID symbols.
Where you see it on a P&ID
On instrument connections, sample lines, purge and small metering lines.
Tag codes
The needle valve is commonly tagged:
- HV
Tag formats follow the project numbering procedure. For instruments, the letters follow ISA 5.1, explained on the instrument symbols page.
Related symbols
Frequently asked questions
What does the needle valve symbol look like on a P&ID?
The two-triangle valve body with a stem and a downward-pointing solid triangle above it, standing for the needle.
What is a needle valve used for?
A needle valve has a long tapered needle that gives very fine flow adjustment. It is used on small lines where flow has to be set precisely. You will find it on instrument connections, sample lines, purge and small metering lines.
What tag does a needle valve have?
It is commonly tagged HV. The exact tag format comes from the project numbering procedure and the legend sheets.
Is the needle valve symbol the same in ISA and ISO?
No. A small solid wedge points down onto the centre of the body. The ISO 10628-2 registration number is X8076. Always check the legend sheets at the front of the P&ID set.
What is the needle valve called in German?
Nadelventil. On a German R&I-Fließschema it is drawn to DIN EN ISO 10628-2.
- In production since 2014
- Thousands of daily users
- On MODEC FPSO projects since 2016