For freeze protection of condensate systems up to 300 psig (20.7 bar) (2068 kpa)
The Armstrong Condensate Sensing Drain Valve
(CSDV) is an automatic valve with a thermostatic wax-filled capsule. The
valve is designed for winterization of steam tracing, instrument
tracing, condensate return line freeze protection or other processes
requiring protection under 150°F (65°C). The valve has an all-stainless
steel body, fittings, spring and plug. It is sensitive to temperature
only, and it can be easily installed in any orientation with a pipe
Since the CSDV discharges below steam temperature,
the valve maintains a water seal that prevents live steam loss.
However, such operation may induce condensate corrosion in the process
line; therefore, use should be limited to applications such as tracing
lines that discharge to the drain. The unique ram-type plug and seat
provide reliable, tight shut-off for longer periods than any other type
available. A sized orifice and control port act together as a labyrinth
restrictor to keep live steam loss to a minimum on failure. CSDVs are
100% factory tested.
The CSDV responds only to condensate temperature.
After condensate cools to near set-point, the CSDV modulates flow to
maintain a constant condensate discharge temperature. Wide open at
start-up for rapid venting and initial heat up, the CSDV is also
self-draining after shut-off, to eliminate freeze damage. Typical
set-points (°F) are 105, 125, 180, 210 and 240 (°C 40, 51, 82, 99 and