certain time interval will delay after the terminals 54 and 55 contact wherein the time interval may be adjusted by a variable resistor vr2 after the condensate in the trap body 31 discharged and dropped in its level the terminals 54 and 55 will no longer contact and the schmitt circuit will become q4 off and q5 on the integrator circuit 57 starts to integrate till the voltage of capacitor c6 is high enough to trigger the scr q8 the capacitor c5 will discharge immediately through scr q7 make the latter become off and thus off the relay 61 the electric solenoid 38 closes and the condensate discharge stops it is also to be noted that the time interval between discharge stop and the terminals 54 55 disconnect may be adjusted by a variable resostor vr4 the above mentioned steam trap is only one embodiment of the present invention particularly suitable for replacing the conventional steam traps in the ordinary factories in other words it is very easy to detach the conventional steam traps and replace by one of the present invention in a new built factory it is better to make an in line design that is to say use the steam pipe itself as the.