Delta’s Line Pressure Operated (DLPO) Surface Safety Systems are
hydraulically operated flow line control valves, arranged to protect a facility
from the effects of pipeline failures.
The primary function of the Line Pressure Operated Surface Safety System
is to detect any abnormal high or low flow line pressure deviations and
respond to it by shutting down the streamline.
The DLPO valve is an actuated gate valve controlled by hydraulic pressure
fed from the pipeline stream, thus it is well-suited for remote unattended
locations. The DLPO is normally closed, preventing the flow from the up
stream to down stream, and it will open only if the pressure amount of the
upstream side falls within a specific pressure range.
This pressure range is defined by two pressure sensors, one for high pressure
sensing (High Pressure Pilot) and one for low pressure sensing (Low Pressure
Each pilot has its own technical function and its set pressure knob.
Available in 2.1/16” through 7 1/16” nominal valve sizes with various