A condensate trap apparatus according to the present invention comprises: an inlet hole for inflowing a condensate; a storage space for storing the condensate introduced from the inlet hole; an outlet unit including a discharge hole for discharging the stored condensate from the storage space; and a buoyant body including a closing portion which is convex vertically downward so as to close the discharge hole by being seated on the outlet unit, and a support of a pillar type extending vertically upward from the closing portion.

A hydraulic valve engages a through opening delimited through a bottom wall of a tank for a liquid and comprises a cage element connected inside the bottom wall, a shutter movably housed in the cage element, a hollow connection element which hermetically engages the through opening delimiting a passage that passes through the hydraulic valve, wherein the hollow connecting element comprises an engagement portion which extends into the through opening and defines a passage opening selectively occludable by means of a shutter as a function of the quantity of liquid in the tank, wherein the hollow connecting element comprises radial notches which define respective passages for a liquid sucked out of the tank through which the formation of a vortex is prevented and the sucking in air.

A drain hole for connecting a discharge hole and the inside of a collection container to each other is formed in a valve seat member. A float support is provided with a cylinder portion in which a piston is incorporated in a slidable manner. An vent valve for opening and closing a vent hole by means of a float is provided to the float support. A drain valve which operates between a closing position at which the drain valve closes the drain hole and an open position at which the drain valve opens the drain hole is provided to the piston. A bleed channel for connecting a piston chamber and the discharge hole to each other is formed by an orifice pin mounted in a bleed hole provided to the drain valve.