Condensate trap

A condensate trap, comprising:

• a casing that is provided with a liquid supply hole located in a side wall of the casing and a liquid discharge hole located in the side wall of the casing underneath the liquid supply hole,
• wherein the casing includes a cylindrical chamber connected with the liquid supply hole in which cylindrical chamber an expansion piston is movable which includes a hollow piston rod that is attached to a bottom side of the expansion piston,
• wherein the piston rod has an outside diameter that is smaller than an outside diameter of the expansion piston,
• wherein the liquid supply hole communicates with a chamber around the piston rod, and
• wherein a wall of the piston rod includes at least one throttling port,
• wherein a siphon is located in the piston rod underneath the at least one throttling port,
• wherein the siphon communicates via an open upper side of the siphon with a first space in the piston rod above the open upper side of the siphon,
• wherein the siphon communicates via an open lower side of the siphon with second a space in the piston rod above a bottom of the piston rod and below the open lower side of the siphon,
• wherein a further throttling port is located in the wall of the piston rod underneath the open upper side of the siphon,
• wherein the further throttling port communicates with the liquid discharge hole as a result of an upward displacement of the expansion piston, and
• wherein a further chamber underneath the bottom of the piston rod communicates via a channel with the liquid discharge hole.