Improvements in Direct-contact Feed Water Heaters.

摘要

3807. Weir, W. Feb. 20. Heating water.-Relates to feedwaterheaters of the directcontact type, in which the steam is taken from the low-pressure, receiver and non- return valve is provided for preventing the passage of water to the cylinder in the event of sudden stoppage of the feedpump. In the present invention, the ordinary non - return valve is replaced by a piston valve or double-beat valve, to prevent noise due to the pulsation of the steam in the pipes. In the form shown in Fig. 1, a float C of the displacement type is arranged within the body of the heater above the normal water-level, and is connected by levers M, N to the spindle of a piston valve L working in a passage B which communicates with the heater through a passage E. Under normal conditions, steam flows freely into the heater, but when the water rises unduly, the float rises and the piston valve closes the passage to the heater. In a modification, the piston valve is replaced by a double-beat valve.