
Bulletin 74.1:Y690A
5
BLOCK
VALVE
BLOCK
VALVE
VENT
VALVE
VENT
VALVE
SUPPLY
PRESSURE
GAS BLANKETING PRESSURE
VESSEL/TANK
INLET PRESSURE
GAS BLANKETING PRESSURE
ATMOSPHERIC PRESSURE
Figure 3. Type Y690A or Y690AH with Internal Registration Operational Schematic
Figure 4. Type Y690AM or Y690AHM Gas Blanketing Regulator with External Registration Operational Schematic
BLOCK
VALVE
BLOCK
VALVE
BLOCK
VALVE
VENT
VALVE
VENT
VALVE
VENT
VALVE
GAS BLANKETING PRESSURE
VESSEL/TANK
VENT POINTED DOWN
INLET PRESSURE
GAS BLANKETING PRESSURE
ATMOSPHERIC PRESSURE
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