MECA-INOX - Double Block and Bleed Ball Valve
Guarantee of total tightness on dangerous fluids with double isolation (2 valves mounted in series). Risk of leakage avoided to protect operators and installations, particularly during equiment maintenance or cleaning on this line. Avoid risk of overpressure bleed the remaining fluid between valve 1 and 2. Close & lock all valves in single and limited area instead of manipulating 3 separate and distant valves.
Normal operation
Main line valves are in open position, while the bleed valve is closed. Fluids flows through
the DBB valve.
Maintenance operation
STEP 1 The upstream valve 1 is closed, while the downstream valve 2 is open. The bleed valve 3 is closed.
STEP 2
The bleed valve 3 is open, to evacuate the remaining fluid to a secured event pipe.
STEP 3
Downstream valve 2 is closed, ensuring double sealing of the pipe section.
The downstream section is now fully isolated and secured for intervention or maintenance works.