GB197127A - Improvements in thermostatic steam control device - Google Patents

Abstract

197,127. Collin, G. W. March 14, 1922. Thermostats.-Relates to thermostats for controlling the supply of heating-fluid through an inlet pipe 6 to a heating-chamber 7 of the type comprising a diaphragm valve 9 located in the inlet pipe at some distance from the chamber 7 and operated by the pressure of the fluid, a pilot valve 38 controlled 'by a thermostatic element 42 located in or adjacent to the chamber 7, and a conduit 18 connecting the main and pilot valves. The pilot valve 38 is slidably arranged in a tubular post 28, which is adjustably mounted in a sleeve 22 clamped to the chamber 7, and when open establishes communication through lateral ports 35, 36 between the conduit 18 and chamber 7. The stem 10 of the main valve 9 has a longitudinal passages 19 which establishes communication between a chamber 20 on the under side of the diaphragm 12 and an upper chamber 17. With the pilot valve open, the normally greater fluid pressure on the under side of the diaphragm 12 keeps the valve 9 open; when. however, the temperature in the chamber 7 rises to the predetermined value, the thermostat 42 closes the pilot valve 38, thus causing a gradual increase of pressure in the chamber 17 and effecting a closure of the main valve 9. The position of the post 28 is adjusted by means of a pivoted arm 46 cooperating with a notched pivoted quadrant arm 48.