Emerson Daniel 700 Series

Technical Guide
DAN-LIQ-TG-44-rev0813
November 2013
24
CLOSED POSITION - Nitrogen gas pressure is higher that the valve inlet pressure, therefore the force of the
nitrogen gas plus the spring keep the valve in the closed postition.
OPEN POSITION - The pressure at the inlet of the valve has exceeded the combined force of the nitrogen gas
plus the spring, thereby causing the piston to become unbalanced, opening the valve and removing the surge
from the pipeline.
Figure 4-15
= Inlet Pressure
= Outlet Pressure
= Gas Pressure
= Oil Reservoir and Main Valve Piston Pressure
Figure 4-16
CLOSED POSITION
Gas Pressure
Gas Pressure
Oil Reservoir
Gas Tank
Pressure
Sensor
Pressure
Sensor
Gas Pressure
Oil Reservoir
Gas Tank
OPEN POSITION
Gas Pressure
= Inlet Pressure
= Outlet Pressure
= Gas Pressure
= Oil Reservoir and Main Valve Piston Pressure