Special Features:MARCK is a fully PFA lined valve for aggressive chemical and ultra-pure
applications. PFA resists chemical attack from most known chemical
compounds, and with a flexible liner design utilizing a full width, 360
degree, resilient back up liner offers bubble tight shut off in even the most
demanding installations. Redundant shaft seals (which include a spring
energized safety packing) provide a tight, reliable seal to the
environment. This is a “maintenance free” valve design which uses long
life sleeve bearings and avoids the use of an adjustable packing gland.
The MARCK valve is rated up to 150 psig and down to 0.0002 psia (full
vacuum). It is available in either a ductile iron wafer or ductile iron lug
body. Standard PFA material is DuPont grade 350, with 450HP available
for ultra-pure applications.