Flowserve BK 37 - Manual (Page 5)

5
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. BK 37..., BK 28... and BK 29...
can also be used for thermal air-venting in steam systems.
Explanatory Notes
Scope of Supply
BK 37:
 Steam trap type BK 37
 Installation manual
BK 28:
 Steam trap type BK 28
 Installation manual
BK 29:
 Steam trap type BK 29
 Installation manual
Description
Thermostatic/thermodynamic steam trap with corrosion-resistant Thermovit Duo s.s. regulator
unaffected by waterhammer. The trap features:
n
Integral strainer
n
Non-return valve action
n
Asbestos-free cover gasket (graphite/CrNi)
n
Installation in any position
The factory setting enables the steam trap to discharge condensate with virtually no banking-up.