Flowserve MK25/2 - Manual (Page 9)

9
Explanatory Notes
Scope of supply
MK 25 / 2
1 Steam trap MK 25 / 2
1 Installation manual
MK 25 / 2 S
1 Steam trap MK 25 / 2 S
1 Installation manual
Description
Thermostatic steam trap with corrosion resistant thermostatic capsule (membrane
regulator). Integral strainer, asbestos-free cover gasket (graphite/CrNi). Installation in
any position.
The thermostatic capsule “H” discharges the condensate with virtually no banking up.
■ MK 25 / 2 with single seat
With four thermostatic capsules “5H2”. For condensate flowrates up to e. g.
2800 kg/h at
∆
p = 5 bar.
■ MK 25 / 2 S with single seat
With nine thermostatic capsules “5H2”. For condensate flowrates up to e. g.
5000 kg/h at
∆
p = 5 bar.
Function
The MK 25... is a multi-capsule high-capacity steam trap with four or nine capsules. 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 25 is neither affected by fluctuations in the upstream
pressure nor by back pressure.The MK 25 can also be used for thermal air venting.
Technical data
Pressure /Temperature Ratings PN 40
Body material 1.0460 (P250GH / C22.8) / ASTM A105
Nominal sizes (DN) 40, 50
Connection Flanged DIN PN 40
Max. allowable pressure PMA [barg] 40 35 28 21 14.5
[psig] 580 508 406 305 210
Inlet temperature TMA [°C] 20 200 300 400 450
[°F] 68 392 572 752 842