Cyclopedia of heating, plumbing and sanitation; a complete reference work . eat crowds the diaphragm overand operates the small valves in amanner similar to that of the metalstrip in the case just described. The general form of a dia-phragm valve is shown in Fig. replace the usual hand-valvesat the radiators. They are similarin construction to the ordinaryglobe or angle valve, except thatthe stem slides up and down in-stead of being threaded and run-ning in a nut. The top of the stemconnects with a flat plate, whichrests against a rubber valve is held open by a spring,a
Cyclopedia of heating, plumbing and sanitation; a complete reference work . eat crowds the diaphragm overand operates the small valves in amanner similar to that of the metalstrip in the case just described. The general form of a dia-phragm valve is shown in Fig. replace the usual hand-valvesat the radiators. They are similarin construction to the ordinaryglobe or angle valve, except thatthe stem slides up and down in-stead of being threaded and run-ning in a nut. The top of the stemconnects with a flat plate, whichrests against a rubber valve is held open by a spring,as shown, and is closed by admit-ting compressed air to the spaceabove the diaphragm. In connecting up the system,small concealed pipes are carriedfrom the air-reservoir to the ther-mostat, which is placed upon aninside wall of the room, and fromthere to the diaphragm valve atthe radiator. When the temperature of the room reaches the maxi-mum point for which the thermostat is set, its action opens a smallvalve and admits air-pressure to the diaphragm, thus closing oft the. Fig. 169. Thermostat of Fig. 168 inOrnamental Casing, 201 ]J2 HEATING AND )\ steam from the radiator. When the temperature falls, the thermostatacts in the opposite manner, and shuts oil the air-pressure from thediaphragm valve, at the same time opening a small exhaust whichallows the air above the diaphragm to escape. The pressure beingremoved, the valve opens and again admits steam to the. radiator. Diaphragm Motors. Dampers arc operated pneumatically ina similar manner to steam valves. A diaphragm motor, so called, isacted upon by the air-pressure; and this lifts a lever which is properlyconnected to the damper by means of chains or levers, thus securingthe desired movement. Dampers. When mixing dampers are operated pneumatically,a specially designed thermostat for giving a graduated movement
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