In a steam trap of the float type comprising a main body forming a chamber having an opening thereto, an inlet port and an outlet port in said main body each communicating with the chamber therein,Hydraulic control valves said main body forming a condensate sump in the chamber and also forming a discharge passage communicating between said condensate sump and said outlet port, a lid mounted on said main body enclosing the opening to the chamber, a free float positioned within said condensate sump in the chamber,Check Valves said main body having another opening extending from its outer surface into the end of said discharge passage communicating with said condensate sump, BALL VALVESa valve seat member positioned within the end of said discharge passage communicating with said condensate sump and extending into the another opening in said main body which extends into said discharge passage, and a valve seat holder positioned within the another opening in said main body and holding said valve seat member in position in said discharge passage, wherein the improvement comprises that said valve seat member is axially elongated and forms a valve port communicating with the condensate sump, an axially extending valve passage extending from said valve part and a duct communicating between said axially extending valve passage and said discharge passage, a piston valve member positioned within and extending in the axial direction of said valve seat member through said valve port and valve passage, one end of said piston valve member located at said condensate sump end of said valve seat member for contacting said float, an annular plate mounted on the opposite end of said piston valve member from the end located at said condensate sump and spaced from said valve seat holder, said annular plate and valve seat holder combining with the another passage in forming a pressure chamber at the end of said piston valve member spaced from the condensate sump, said piston valve member forming a pilot valve port at its condensate sump end and an axially extending passage connecting said pilot valve port with the pressure chamber, said float arranged to seat against and block flow into said pilot valve port and to be displaced from said pilot valve port as the level of condensate in said sump rises for admitting flow through said pilot valve port and passage into the pressure chamber for axially displacing said piston valve member relative to said valve seat member and admitting the flow of condensate from the sump into said discharge passage.

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