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 wrench.
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 115).