Flowserve DK 45 - Manual (Page 6)

6
Explanatory Notes
Description
Scope of supply
DK 45
Steam trap
Installation manual
Thermodynamic steam trap for discharging condensate with virtually not banking-up. With integrated
non-return valve and Y-type strainer. Asbestos-free body gasket (graphite).
Installation in any position.
The thermodynamic steam trap features a movable valve disk that rests on a double seat. The
condensate enters the steam trap from below, thereby lifting the disk off its seat. It is then deflected
by 80° and flows through the small seat orifice into the discharge line. As the temperature of the
condensate increases, upstream pressure builds up in the space above the valve disk. When the
condensate evaporates into steam, a low-pressure area is formed under the disk due to the increased
flow velocity, forcing the disk downwards against its bearing surface and stopping all flow. Since the
pressure above the valve disk is acting on a larger surface area, the closing force is much higher
than the pressure pushing against the disk from the inlet side. As the steam loses heat, some of it
condenses, reducing the pressure above the valve disk and hence the closing force. As soon as the
pressure on top of the disk has dropped to a value that equals the opening pressure produced by the
upstream pressure, the disk is lift off its seat, and the cycle repeats itself. External factors such as
heat, wind, precipitation etc. can effect the functioning and performance of the thermodynamic steam
trap considerably. However, the DK 45 is not influenced by these environmental factors because the
regulator is protected by the permanently mounted cap.
Function