Advantages of the impulse steam trap
Impulse traps have a substantial condensate handling capacity
for their size.
They will work over a wide range of steam pressures without
any change in valve size and can be used on high pressure
and superheated steam.
They are good at venting air and cannot 'air-bind'.
Disadvantages of the impulse steam trap
Impulse traps cannot give a dead tight shut-off and will
blow steam on very light loads.
They are easily affected by any dirt which enters the trap
body due to the extremely small clearance between the piston
and the cylinder.
The traps can pulsate on light load causing noise, waterhammer
and even mechanical damage to the valve itself.
They will not work against a backpressure which exceeds
40% of the inlet pressure