Multi-cone, multi-stage spray nozzle

A steam conditioning device, comprising:

• a steam pipe;
• a plurality of spray nozzles connected to a manifold and mounted about the steam pipe, the plurality of spray nozzles adapted to deliver cooling water flow into the steam pipe, each spray nozzle comprising:
• a nozzle body having a proximal end, a distal end, a first through bore extending between the proximal and distal ends of the nozzle body, and a valve seat disposed at the distal end of the nozzle body;
• a valve stem slidably disposed in the first through bore of the nozzle body and including a proximal end, a distal end, and a first valve head, the first valve head defining a seating surface adapted to engage the valve seat when the valve stem is in a closed position and adapted to be spaced away from the valve seat when the valve stem is in an open position;
• a fluid conduit disposed in the valve stem and defining a fluid outlet in the first valve head at the distal end of the valve stem;
• and
• a second valve head attached to the fluid outlet at the valve head of the valve stem, the second valve head defining a nozzle opening that is continuously open in fluid communication with the fluid conduit in the valve stem;
• and
• a bias device generating a force biasing the first valve head of the valve stem toward the valve seat of the nozzle body, wherein
• upon application of a first fluid pressure, which is less than a threshold fluid pressure, on the seating surface of the first valve head, the bias device maintains the valve stem in the closed position while the second valve head is continuously open, and
• upon application of a second fluid pressure, which is at least as great as the threshold fluid pressure, on the seating surface of the first valve head, the valve stem moves from the closed position to the open position while the second valve head remains continuously open.