For pressures to 250 psig (17 bar) . . .
Capacities to 20, 000 lb/hr (9072 kg/hr)
Armstrong automatic differential condensate controllers (DC) are
designed to function on applications where condensate must be lifted
from a drain point or in gravity drainage applications where increased
velocity will aid in condensate drainage.
When lifting from the drain point, often referred to as siphon
drainage, the reduction in pressure that occurs when the condensate is
elevated causes a portion of it to flash back into steam.
Ordinary steam traps, unable to differentiate between flash steam
and live steam, close and impede drainage. Increased velocity with
gravity drainage will aid in drawing the condensate and air to the DC.
This increased velocity is caused by an internal bypass, controlled
by a manual metering valve, so the condensate controller will
automatically vent the bypass or secondary steam. This steam is then
directed to the condensate return line or collected for use in other
Installation and Maintenance