Pressure regulator symbol
Also called Self-actuated regulator, PCV
A pressure regulator holds downstream (or upstream) pressure without any controller or external power. It senses the pressure itself through a diaphragm.
What the pressure regulator symbol means
A pressure regulator holds downstream (or upstream) pressure without any controller or external power. It senses the pressure itself through a diaphragm.
How it is drawn
A valve body with a diaphragm actuator and a sensing line running from the actuator to the pipe downstream of the valve.
Variants
- Back-pressure regulator: sensing line upstream
The pressure regulator symbol in each standard
Drawn as ISA 5.1 defines it, as on most US and international legends.
ISO 10628-2 does not draw actuators. Actuators come from ISO 14617-4, and how a valve is controlled is shown with the instrumentation, usually to IEC 62424.
German (DIN): Druckminderer. See DIN P&ID symbols.
Where you see it on a P&ID
On fuel gas, instrument air, nitrogen blanketing and utility supplies.
Tag codes
The pressure regulator is commonly tagged:
- PCV
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 pressure regulator symbol look like on a P&ID?
A valve body with a diaphragm actuator and a sensing line running from the actuator to the pipe downstream of the valve.
What is a pressure regulator used for?
A pressure regulator holds downstream (or upstream) pressure without any controller or external power. It senses the pressure itself through a diaphragm. You will find it on fuel gas, instrument air, nitrogen blanketing and utility supplies.
What tag does a pressure regulator have?
It is commonly tagged PCV. The exact tag format comes from the project numbering procedure and the legend sheets.
Is the pressure regulator symbol the same in ISA and ISO?
ISO 10628-2 does not draw actuators. Actuators come from ISO 14617-4, and how a valve is controlled is shown with the instrumentation, usually to IEC 62424. Companies vary the details, so always check the legend sheets at the front of the P&ID set.
What is the pressure regulator called in German?
Druckminderer. 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