Small impulse and pilot lines transmit pressure information or control the operation of a pilot-operated regulator.
Impulse line
Transmits downstream pressure to the sensing element of the regulator.
Pilot line
Participates in the pressure control that moves the main mechanism of the regulator.
Common problems
Clogging, kinking, leakage, or condensate can provide a false signal and cause hunting or incorrect output pressure.
Maintenance
The lines must remain clean, leak-tight, and correctly connected to the designated pressure sensing points.
