The term droop describes the normal decrease in a regulator's outlet pressure as flow rate increases. It does not always indicate a fault; it is a characteristic of the regulator's operation.
What happens in practice
With low consumption, the regulator can maintain pressure very close to the setpoint. When demand increases, a larger opening is required, and the outlet pressure may decrease slightly.
When is droop excessive
If the pressure drops more than allowed, there may be an incorrect sizing selection, insufficient inlet pressure, or a problem with the regulator itself.
How it is evaluated
We measure the outlet pressure at different loads and compare it with the manufacturer's curves.
Why it matters
Significant droop can lead to low gas pressure alarms or the burner's inability to reach its full power capacity.
