Flowserve BK 15 - Manual (Page 7)

7
Pressure /Temperature Ratings PN 40
Body material Forged steel 1.0460 (P250GH / C22.8) / ASTM A105
Nominal sizes (DN) 40, 50
Connections Flanged to DIN PN 40
Service pressure PMA [barg] 40 35 28 21 14.5
[psig] 580 508 406 305 210
Related temperature TMA [°C] 20 200 300 400 450
[°F] 68 392 572 752 842
Technical Data
Explanatory Notes
Scope of Supply
BK 15
1 Steam trap type BK 15
1 Installation manual
Description
Thermostatic/thermodynamic steam trap with corrosion-resistant regulator unaffected
by waterhammer. The Duo stainless steel regulator is externally adjustable. With
integral strainer and non-return valve action. Asbestos-free cover gasket (graphite).
Installation in any position.
The steam trap is adjusted at our factory to discharge condensate with virtually no
banking-up. More undercooling (banking-up of condensate) can be manually adjusted
during operation from the outside.
Function
During start-up of the plant the Duo stainless steel plates are flat. The service
pressure acts in the opening direction, the valve is completely open. As the
condensate temperature rises, the plates deflect, drawing the stage nozzle towards
the closed position. As the condensate temperature sinks, the deflection of the Duo
stainless steel plates decreases and the steam trap opens at the adjusted opening
temperature.
The thermostatic and spring characteristics of the stack of plates are balanced such
that condensate is always discharged at a given undercooling temperature.
The trap provides automatic air-venting at start-up and during operation. The correct
functioning of the BK 15 is neither affected by upstream pressure variations nor by
back pressure. The BK 15 can also be used for thermal air-venting in steam systems.