Flowserve MK 45 - Manual (Page 8)

8
Explanatory Notes
Scope of Supply
MK 45
1 Steam trap MK 45
1 Installation manual
MK 45A
1 Steam trap MK 45 A
1 Installation manual
Description
Thermostatic steam trap with corrosion-resistant thermostatic capsule unaffected by waterhammer.
Integral Y-type strainer and non-return valve. Asbestos-free cover gasket (graphite/CrNi). Installation in
any position.
The traps with standard capsule “N” discharge condensate with virtually no banking-up, the traps with
special capsule “U” with an undercooling of approx. 30 K (degC).
■ MK 45-1 with tandem seat (double sealing)
Particularly suitable for low condensate flowrates.
Optionally either with standard capsule “5 N 1” or
undercooling capsule “5 U 1”.
■ MK 45-2 with single seat
For larger condensate flowrates.
Optionally either with standard capsule “5 N 2” or
undercooling capsule “5 U 2”.
■ MK 45 A-1 with tandem seat (double sealing)
Particularly suitable for low condensate flowrates.
Optionally either with standard capsule “5 N 1” or
undercooling capsule “5 U 1”.
■ MK 45 A-2 with single seat
For larger condensate flowrates.
Optionally either with standard capsule “5 N 2” or
undercooling capsule “5 U 2”.
Function
The MK 45... is a thermostatic steam trap with membrane regulator. The capsule is filled with a liquid
which boils at a temperature a few degrees lower than water. As long as condensate flows through the
steam trap the liquid in the capsule is completely condensed due to the low ambient temperature. The
pressure inside the capsule is lower than the surrounding pressure (service pressure) and the
membrane with the valve disc is pushed in the opening direction. As the condensate temperature
approaches steam temperature, the liquid filling of the capsule starts to boil and evaporate. The
pressure in the capsule rises and the membrane with the valve disc is moved in the closing direction.
Automatic air-venting is provided both, during start-up and during normal operation. The correct
functioning of the MK 45 is neither affected by fluctuations in the upstream pressure nor by back
pressure.The MK 45 can also be used for thermal air venting.