Heating and ventilating buildings : a manual for heating engineers and architects . spray, and water, which also tends to rise to supply thehorizontal, as its steam condenses, and being lighter than thesolid water of the drop-leg it rises much faster. By this proc-ess the riser will empty its contents into the horizontal, whencethere is a free run to the drop-leg and thence to the boiler. 137. Reducing-valves.—The reducing-valve is a throttling-valve arranged to be operated automatically so as to reducethe pressure and also to maintain a constant pressure on thesteam-mains. A great many forms
Heating and ventilating buildings : a manual for heating engineers and architects . spray, and water, which also tends to rise to supply thehorizontal, as its steam condenses, and being lighter than thesolid water of the drop-leg it rises much faster. By this proc-ess the riser will empty its contents into the horizontal, whencethere is a free run to the drop-leg and thence to the boiler. 137. Reducing-valves.—The reducing-valve is a throttling-valve arranged to be operated automatically so as to reducethe pressure and also to maintain a constant pressure on thesteam-mains. A great many forms of these valves are incommon use. In one a diaphragm of metal or rubber is em-ployed, as in Fig. 203. The low-pressure steam acts on oneside of the diaphragm, a weight or spring which may be set atany desired pressure on the other side. This diaphragm is EXHAUST AND VACUUM STEAM-HEATING SYSTEMS. 301 connected with a balanced valve which is moved to or from itsseat as less or more steam is required to preserve constantpressure. Since the pressure in the main steam-pipe does not. Fig. 203.—Holts Reducing-valve. effect the motion of the valve, its position will depend uponthe pressure on the two sides of the diaphragm. The pressureon one side is that due to the steam which has passed throughthe valve, and that on the other to a weight or spring whichcan be set at any desired point. Another form of reducing-valve with differential piston anddiaphragm is shown in Fig. 204, and is described as follows: Steam from the boiler enters at side steam inlet and,passing through the auxiliary valve K, which is held open bythe tension of the spring S, passes down the port marked fromauxiliary to cylinder, underneath the differential piston raising this piston D the valve C is opened against theinitial pressure, since the area of C is only one half of thatof D. Steam is thus admitted to the low-pressure side, andalso passes up the port XX underneath the phosphor-bronzediaphragm 00. Whe
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