Handbook for heating and ventilating engineers . energy but this loss is amply repaid in the addedbenefits. Several patented systems of mechanical vacuum heatingare now upon the market. These are in large measure anoutgrowth of the original Williames System, patented in1882. Each system is well represented by the above diagramin all particulars concerning the steam and water circu-lation. The chief difference between them is in the thermo-static or motor connection at the entrance to each individualreturn. 93. Webster System:—In this system a pump is used toproduce the vacuuinr. A special fitt
Handbook for heating and ventilating engineers . energy but this loss is amply repaid in the addedbenefits. Several patented systems of mechanical vacuum heatingare now upon the market. These are in large measure anoutgrowth of the original Williames System, patented in1882. Each system is well represented by the above diagramin all particulars concerning the steam and water circu-lation. The chief difference between them is in the thermo-static or motor connection at the entrance to each individualreturn. 93. Webster System:—In this system a pump is used toproduce the vacuuinr. A special fitting, called a water-sealmotor, or thermostatic valve, is used on all radiators, coils anddrainage points. Fig. 75 shows a section of one of the motorvalves. Other models are constructed so as to have the out-let in a horizontal direction, either parallel with or 90 de-grees to the inlet. Fig. 76 shows an application of this to aradiator or coil. The dirt strainer is usually placed betweenthe radiator or coil and the motor valve. This strainer. Fig. 75. DIRT 5traine:r CONNECT INTOTOP OF RETURN Fig. 76. collects the dirt and protects from clogging the motor attaches to the return end of the radiator or coil and Lleads to the vacuum pumip. O is the central tube, the lowerend of which is a valve. A is a hollow cylindrical copperfloat, the central tube of which fits loosely over spindle B. 146 HEATING AND VENTILATION The function of the cylinder A Is to raise the tube O fromthe seat H and open the discharge to the pump. Ordinarily,the float is down and the central tube valve is resting uponthe seat and cuts ofC communication with the radiator, ex-cepting as air may be drawn from the radiator down thecentral tube around the spiral plug. The water of conden-sation accumulating in the radiator or coil passes into thechamber E, sealing- the valve, and when sufficient water hasaccumulated to lift the float, it opens a passageway for acertain amount of the water to be withdrawn
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectventila, bookyear1913
