Cyclopedia of heating, plumbing and sanitation; a complete reference work . nd the returns connected near thebottom below the water-line. A balance-pipe, so called, should connect the heating main withthe top of the tank, for equalizing the pressure; otherwise the steamabove the water would condense, and the vacuum thus formed woulddraw all the water into the tank, leaving the returns practically emptyand thus destroying the condition sought. Sometimes an inde-pendent regulator or pump governor is used in place of a type is shown in Fig. 120. The return main is connected at 141 13
Cyclopedia of heating, plumbing and sanitation; a complete reference work . nd the returns connected near thebottom below the water-line. A balance-pipe, so called, should connect the heating main withthe top of the tank, for equalizing the pressure; otherwise the steamabove the water would condense, and the vacuum thus formed woulddraw all the water into the tank, leaving the returns practically emptyand thus destroying the condition sought. Sometimes an inde-pendent regulator or pump governor is used in place of a type is shown in Fig. 120. The return main is connected at 141 132 HEATING AM) VENTILATION the upper opening, and the pump suction at the lower. A float insidethe chamber operates the steam valve shown at the top, and the pumpworks automatically as in the ease just described. It it is desired to raise the water-line, the regulator may beelevated to the desired height ami connections made as shown inFig. 121. Return Traps. The principle of the return trap has been de-scribed in Boiler Accessories, bul its practical form and application. Fig. 119. Combined Receiver and Automatic Pump for Returning Water ofCondensation to Boiler. will be taken up here. The type shown in Fig. 122 has all its workingparts outside the trap. It consists of a cast-iron bowl pivoted at (7andIT. There is an opening through G connecting with the inside ofthe bowl. The pipe K connects through 0 with an interior pipeopening near the top (see Fig. 123). The pipe J) connects with areceiver, into which all the returns are brought. A is a check-valveallowing water to pass through in the direction shown by the is a pipe connecting with the boiler below the water-line. B is a 142 HEATING AND VENTILATION 133 check opening toward the boiler, and K, a pipe connected with thesteam main or drum. The action of the trap is as fol-lows : As the bowl fills with water fromthe receiver, it overbalances theweighted lever and drops to the bot-tom of the ring. This opens the valveC,
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