Patent GB-318199-A (GB)
Title: Improvements relating to boiler feed water regulators
IPC: F22D5/16
Filed: 1929-07-22
Abstract: 318,199. Bailey Meter Co., (Assignees of Barrett, J. M.). Aug. 30, 1928, [Convention date]. Feedwater, controlling. - In a feed regulator of the kind in which the feed valve 3, Fig. 1, is operated by the pressure of a vapour generated in a chamber 9 around a pipe 6 at the boiler water level and in free communication with the boiler, means are provided for readily fitting the vapour chamber on a boiler, adjusting the position of the chamber on the pipe 6 in accordance with the load on the boiler, and quickly opening the feed valve and the pressure differential valve 4 in an emergency. The pipe 6 is connected at its upper and lower ends to a vertical pipe 15 fitted with valves 16, 17 adapted to be connected to the steam and water lines 18, 19 of the gauge glass. The pressure generated in the chamber 9 is communicated through a pipe 13 to metal bellows operating the feed valve against the pressure of a spring 21. The valve may be opened quickly by a wheel or hand lever 74 which rotates a cam engaging the valve stem. A goose-neck connection 24 at the top of the pipe 6 and a water cooling chamber 26 at its lower end ensure a prompt cooling of the vapour chamber and the closing of the feed valve upon the boiler water rising to a high level. The position of the vapour chamber along the pipe 6 is adjusbed by mechanism comprising cables 30 connected to the ends of a pivoted lever 31, which is turned on its pivot by a rod 38 connected to bellows enclosed by a casing 36 and acted upon on opposite sides by the steam pressure in the steam supply main 41 through a pipe 40 and the boiler pressure in the pipe 19 through a pipe 42. To increase the water supply to meet a sudden drop in the boiler water level, due say to a stoppage of the fuel supply to the furnace, the pipe 40 may be placed in communication with the atmosphere through a valve 40<x>; which is normally maintained in its closed position against the presure of a spring in a casing 40a by means, such as the pressure on the furnace, responsive to the lowering of the fire. The pressure differential valve 4 operated by bellows 57, Fig. 6, normally acted upon inside by the boiler pressure and on the outside by water pressure on the outlet side of the valve is fully opened when the boiler water level drops abnormally by the automatic operation of a valve 59, which closes the pipe 60 connecting the boiler water space with the inside of the bellows and opens a pipe 62 through which the inside of the bellows is subjected to the high pressure on the inlet side of the valve 4. The valve 59 is operated by the pressure of the vapour generated in a chamber 64, around a pipe 65 arranged at the low water level and connected with the upper and lower parts of the boiler. The valve 4 may be opened by manually closing valve 61 and opening a valve 78. To prevent injury to the bellows 57 upon a sudden rush of high pressure water into them, the inlet 80 is restricted by an extension 81 of the main valve stem. The extension is formed with longitudinal grooves which increasing restrict the inlet as the bellows expand, the inlet in the final position of the valve 4 being closed by a check valve 84 on the end of the extension.