Model CSDV Thermostatic Drain Valves

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).