Water and steam mixing device

A device for the mixing of water and steam which includes:

• a safety valve into which supply lines for water and steam discharge and including a valve in said safety valve which is actuated by cooling water pressure and which interrupts the steam supply when the water supply is absent, and a valve casing having a cylindrical bore containing an axially displaceable piston therein;
• a first spigot for steam on said casing and extending transversely of the axis of said bore, and a second spigot for water spaced axially of said first spigot on said casing;
• a cylinder in said bore and formed with openings on the steam side and openings on the water side which in an open position are in alignment with openings in the piston on the steam side and openings in the piston on the water side, and which openings in the cylinder and piston respectively do not register with one another in a closed position of the piston;
• said piston having an axial bore;
• a valve inserted coaxially into said axial bore of the piston and axially displaceable in relation thereto;
• a head portion on said valve which is subjected to the water pressure;
• and
• a spring on the end of said piston opposite said head portion which, when the water pressure is absent, pushes the valve into the closed position against an end stop so that the valve cuts off the flow of steam through the openings in the piston, and when the water pressure is present the valve is displaced against the force of the spring into the open position to permit the steam to flow through the piston openings, whereby the piston openings are so arranged that the water-to-steam mixing ratio can be changed.