Archive image from page 382 of Department bulletin (1923-1929). Department bulletin departmentbul11261150unit Year: 1923-1929. Bui. 1136, U. S. Dept. of Agriculture. PLATE VII. Thermostatic Air Valves and Traps. In those illustrated the thermostatic element consists of a flexible capsule C and a volatile or nonvolatile liquid, the expansion of which shuts the valve. The capsules serve as springs to open the valves. The traps are provided with ad- justing nuts A to compensate for variations in the steam pressure in the system. '

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Keywords: 1920, 1923-1929, archive, book, bookauthor, bookdecade, bookpublisher, bookyear, drawing, historical, history, illustration, image, page, picture, print, reference, united_states_dept_of_agriculture, vintage, washington_d_c_the_dept_supt_of_docs_g_p_o_