Cyclopedia of heating, plumbing and sanitation; a complete reference work . 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,
Cyclopedia of heating, plumbing and sanitation; a complete reference work . 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. MM A Mt in. Pig. 170. Thermostat Operating through Expansion or Contraction of the Vaporof a Volatile Liquid. to the damper should be used. By this arrangement the damperis held in such a position at all times as to admit the proper proportionsof hot and cold or tempered air for producing the desired temperaturein the room with which it is connected. Large dampers which are to be operated pneumatically, shouldbe made up in sections or louvres. Dampers constructed in thismanner are handled much more easily than when made in a singlepiece. It often happens, in large plants, that there are valves anddampers in places which are not easily reached for hand manipula-tion. These may be provided with diaphragms and connected withthe air-pressure system for operation by hand-switches or cocks 202
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