Flowserve DK 45 User Manual download pdf (Page 6)

Explanatory Notes

Description

Scope of supply

DK 45

1 Steam trap

1 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 180° 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

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Flowserve DK 45 User Manual Page 6