Koch-Glitsch

• Higher capacity than full-size
  valve trays: smaller tower or
  more throughput
• High efficiency:
  fewer trays or less reflux required
• Fixed opening:
  valve cannot stick shut
• Formerly used on SUPERFRAC®
  tray decks only
• FRI tested
• Cost effective

This widely-used, fixed, high-performance valve has been tested at FRI on two different sets of high capacity trays.

• The net rise can range from as low as 4 mm [0.158 in] to as high as 11 mm [0.433 in]. Recommended rises vary with deck thickness and the nature of the service.
• A fixed valve can never become stuck to the deck nor can it spin.
• The VG-0 valve’s fouling resistance is quite good. It has been used in a number of fouling applications on the decks of high performance, anti-fouling SUPERFLUX® trays.
• The operating range is quite good, exceeding that of a sieve tray and almost matching that of moving valves. The VG-0 valve is replacing full-size, conventional moving valves in many installations.

• provide reduced entrainment and better efficiency than conventional valve and sieve trays
• provide improvement in capacity that can exceed 13% in spray regime services with low-to-moderate weir loadings
• exhibit a more uniform froth action on the tray deck compared to full-size valves
• are directional with the rear leg being a little wider than the downstream front leg
• provide a slight pushing action to the liquid as vapor passes through the valves
• maintain a more uniform flow pattern on crossflow trays with less retrograde action