A constriction device for a steam trap of a radiator, which may replace prior art thermostatic elements and valves in the steam trap body. The device includes a nozzle body that replaces the valve, and a venturi-like constantly open passage extends through the body.BUTTERFLY VALVES The passage has a turbulence producing inlet and a turbulence reducing outlet and a connecting throat. A filter screen is carried by the nozzle body to prevent particles from being carried into the passage.  In a thermostatic radiator steam trap having a hollow,Balance Valves cylindrical steam trap body with a first end and a second end, a radial steam inlet, a cover fitting over and closing the first steam trap body end and an axial condensate outlet extending from the second steam trap body end, apparatus for replacing an existing thermostatic element, valve and a valve seat mounted in the condensate outlet,Cast Steel Valves the apparatus comprising: a cylindrical nozzle body having a top and a diameter and an exterior shape which fits into the condensate outlet in place of the existing valve seat so that the nozzle body top is positioned below said steam inlet when the nozzle body is inserted into a condensate outlet; means for mounting the nozzle body in the condensate outlet; a venturi passage formed coaxially in the nozzle body and extending therethrough, the passage having an inlet having a first diameter, means connecting the inlet with a cylindrical throat having a second diameter less than said first diameter, having a third diameter greater than said second diameter, and means connecting the throat to the outlet so that said passage acts as a venturi passage; and a filter screen replacing the existing thermostatic element and valve for preventing particles from being carried into the passage, the filter screen having an annular transverse cross-section, extending from the cover to the nozzle body, being located coaxially within the steam trap body and having a diameter larger than the nozzle body diameter so that the filter screen completely surrounds the nozzle body and steam entering the steam trap body through the steam inlet passes radially through the filter screen and enters the venturi passage inlet.

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