Steam Trap Comparison by Method of Operation

This comparison of steam traps is based on discharge pattern and condensate discharge temperature of different types of steam traps.

This steam trap comparison helps to select correct kind of steam trap for different applications.
Trap Type Usual Discharge Pattern Discharge Temperature
Thermodynamic Blast action. Tight closure between discharges Near to Steam
Balanced Pressure Thermostatic Blast action on medium/heavy loads and pressures. Tight closure between discharges. Tendency to dribble on light loads Below steam. Actual temperature depends on capsule filling
Balanced Pressure thermostatic (fixed temperature discharge)     Continuous dribble discharge.
At a fixed temperature below atmospheric boiling point
 Liquid Expansion   Continuous discharge on steady normal or heavy loads.   
Well blown steam discharges at fixed temperature adjustable between 60 & 100o C
 Bimetallic    Continuous dribble discharge   
 Below steam. Discharge temperature depends on element setting and back pressure
 Inverted Bucket   
Blast action with tight closure between discharges.  Tendency to dribble on light loads or low pressure    At steam temperature on moderate load
 Ball Float
Continuous discharge varying with amount of condensate.   
 At steam temperature
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