Nozzle-type steam trap

A nozzle-type steam trap that causes steam flowing in from a steam transport channel to flow through a venturi nozzle, an orifice nozzle, or a tunnel structure resistance nozzle and that drains a drain water from a drain-water drainage channel, the nozzle-type steam trap comprising a nozzle sealing means disposed on a drain-water drainage side of the nozzle that has a small-diameter tube-shaped bore through which the drain water is drained, the nozzle sealing means sealing the bore by using the drain water,

• wherein the nozzle sealing means is a drain-water storage portion that includes an intra-drain system drainage port connected to an extra-drain system drainage port through which the drain water is drained to an outside of a system of the nozzle-type steam trap, the extra-drain system drainage port being disposed at a portion above the intra-drain system drainage port,
• wherein the steam transport channel through which the steam flows into the nozzle-type steam trap and the drain-water drainage channel through which the drain water is drained via the extra-drain system drainage port of the nozzle-type steam trap are not on an identical axis, and
• wherein the steam transport channel includes a plurality of steam transport channels through which the steam flows into the system of the nozzle-type steam trap, the drain-water drainage channel includes a plurality of drain-water drainage channels through which the drain water is drained to the outside of the system of the nozzle-type steam trap from the extra-drain system drainage port, and a means for closing a selected one of the steam transport channels and a selected one of the drain-water drainage channels is provided.