Double offset butterfly valve (high performance)
12 - 100", class 300 | MAPABLOC
Metso Automation
The MAPABLOC high performance butterfly valve with a double block and bleed sealing system is developed for use as a transfer gas line valve and decoking gas valve in ethylene plants. The patented double block and bleed sealing system has two sealing elements. The sealing elements are located on the shut-off disc and act independently. The double block and bleed sealing system is connected with two steam connections. The first steam connection with continuous steam purging works in the valve open position to avoid any coke build-up in the seat area. The second steam connection acts as a block media in the valve closed position between the two sealing elements. This double block and bleed sealing system safely separates two media in the pipeline.
Size and pressure range
NPS 12 - NPS 100
CL 150, 300, higher classes on request
Materials
Carbon steel
Stainless steel
Temperature range
-40 °C to 600 °C / -40 °F to 1112 °F
Applications
Ethylene plants
Transfer line valve and decoking valve
Seat-Disc
Double block and bleed with steam purging
