US50294A - Steam-warming- apparatus - Google Patents

Description

l the steampressure, which enabled to hold the water quietly down in the said elongated oat out the air without sensibly dctracting from l as would oc'cwith a spherical float. In other pressure is hence bottom ofthe manifold until it can-escapeinto the return-pipe Il.

Another evil, heretofore of frequent occurrenc-e, has grown outot the neglectof persons in charge to close at the same time the return as well as the supply cock ot' each inactive coil, and the consequence has been that the condensation-water from one or more active -coils above has backed up7 into the inactive -eoil and has Hooded the apartment -by escaping at the thermostat, or, i 7here no thermostat has been used, the inactive coil has become vfilled with water, which, owing to the substantially equal pressure at both ends,has opposed the entrance of steam when it has been desired to use that particular coil. This evil, together with the lodgment of water subject to freeze within the coils and return-pipes, I have removed by the provision of self-acting check-valves I, 'placed at a suitable distance below the manifold, as above described, and by the provision. ot' my air-discharging and water-returning-tank K, which completes the circuit of operations in the following manner: 'Ihe elongated float Q having been lifted by the condensation-water so as to closethe valve P, an equilibrium of pressure takes place betweeu the tank and thc boiler, and, the hydro static column in the former being now'lnore than sufficient to overcome the excess of outside area ofthe valve M, the entire, or' nearly entire, yolume of water in the tank Vruns off into the boiler.

The abovecoinplete evacuation could not take place if the ii'oat Q were ofthe customary spherical form, because the least depression of the water would act to open the valve P, and by relieving the pressure within the tank would enable the pressure within the boiler to almost immediately reclose the valve M, while,

on the other hand, the elongated tioat Q being so proportioned as to swim with two-thirds or more of its height ont of the water,.and the length of the oat being nearly equal to the caliber `of the tank, the ioat does not drop until the water has nearly allv left the tank. rlhe retention of the valve P to the closed condition is still further prolonged by the pre-` ponderating effective pressure-surface of the lower side of the valve P while the latter is closedbut when the valve P is open, as in the drawings, the tank must uearlytill before the valve P will close again, because the steam,

pressing equally on all sides of thenow open valve, possesses no preponderating influence to close it; hence tbe tank `is enabled by use of to' discharge nearly its entire volume at each lift of the valve M, instead of only a very small part of its volume,

words, the elongated form of ilovatiQ, acting .in 7

conjunction with the unequal areas of the npper and lower sides of the valve l, results .in holdingsaid valve both' longer closed as well niitting the escape of all air, gas, andvapor that would otherwise interfere with the action of the tank.

The above-described process having been allowed to continue until steam alone isseen to escape at the von tage N, the throttle O may be closed down, and the tank will afterward,

during` active operation, discharge a portion of its contents at brief intervals whenever the excess of hydrostatic pressure in the tank overcomes the excess of eifective pressure-surface on the boiler side of the valve M.

By the above-described means I provide for an effectual escapeof the supera'bumlant air and. condensation-water incident to the first starting of the apparatus in the morning or an increased activity after partial or entire iuaction of one or more coils.

A inodilication ot my arrangement may conduct the return-water to' the bottom of the boiler bya pipe such as that indicated by dotted lines It in Fig. l.

Being aware that steam-wa1ming` apparatus have long been provided with check-valves in their discharge-passages, l make .no claim,

broadly, to such.

I claim herein as new and of my invention- 1.A The provision of 'the manifold F, having the automatic'air-vent Gg g or its equivalent at its upper part and the water-receptacle f at its'lower part, substantially as and for the purpose set forth.

2. The provision, in the return-pipe II,-of the diaphragm h and valve I, so arranged as 'to open and close automatically by the alternate action of the back-pressure ot' the steam and the forward pressure of the water of condensation, the latter being completely emptied at each discharge, substantially as set forth.

3. In the described combination, with the tank K, pipe-L, water-discharge valve M, ventage N, and air-discharge valve P, or their equivalents, the provision of the elongated oat Q, arranged and operating as set forth.

In testimony of which invention I hereunto set my hand.

C. '.A. IWILSON.

Witnesses Gao. H. KNIGHT, JAMES H. LAYMAN.

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