Flowserve SMK 22 - Manual (Page 5)

5
Function
The SMK 22... is a steam trap with membrane regulator, the capsule of which is filled with a liquid
having an evaporation temperature that is just a few degrees below the saturation temperature of
water. When condensate is flowing through the trap the liquid filling of the membrane is completely
condensed due to the the low ambient temperature. The pressure in the capsule is lower than the
surrounding pressure (service pressure), which means that the membrane with the valve disc is
pushed in the opening direction. As the temperature rises, the liquid filling starts to evaporate. The
pressure in the capsule increases, the membrane with the valve disc is moved in the closing direction.
The operation of the trap is neither influenced by fluctuations in the upstream pressure nor by back
pressure.
Explanatory Notes
Description
The thermostatic steam trap features minimum stagnant area and a corrosion-resistant membrane
regulator unaffected by waterhammer. Used for discharging condensate and air-venting steam in
sterile and aseptic applications.
The membrane regulator has a self-centering valve cone that can move freely, thereby ensuring
steam-tight shut-off unaffected by particulate matter.
The membrane regulator features high response sensitivity (evaporation thermostat). Automatic air-
venting and discharge of condensate without any banking-up within the rated pressure/temperature
range. The opening temperature is approximately 5 K below the boiling point.
All parts in contact with the fluid are made of stainless steel and the body gasket is of EPDM (O-ring),
optional PTFE (SMK 22) and PTFE (SMK 22-5) in accordance with the regulations specified by the
Food and Drug Administration (FDA).
The surface roughness Ra of the wetted surfaces is
≤ 0.8 µm.
Scope of supply
SMK 22
 Steam trap type SMK 22
 Wing nut (not fitted)
 Installation manual
SMK 22-51
 Steam trap type SMK 22-5
 Wing nut (not fitted)
 Installation manual