GB190916000A - Improvements in Automatic Stop-valves for Steam Generators. - Google Patents

Abstract

16,000. Lombard, J. Aug. 3, 1908, [Convention date] Check valves ; valves closing with rush of fluid.-Relates to an automatic valve for use with steam - generators forming a part of a group or series, the object being to cut out automatically a damaged generator and to prevent the passage of steam into the same from the generators that are working. Fig. 2 shows the valve in sectional elevation. The steam from the generator enters the valve casing at c and escapes to the steam main through the passage d. The valve 10 is attached by a spindle 11 to a piston 12 working in a chamber 19. The chamber 19 communicates through passages 17, 13 with the interior of the valve casing on the two sides of the seat 6. Normally, the valve 10 occupies the position shown, the steam being free to pass from c to d. If steam passes in the reverse direction, it flows down the passage 13 and forces up the piston 12, thus closing the valve 10 upon the seat 6. The part of the chamber 19 above the piston 12 may be placed in communication with the atmosphere by means of a valve 21 in the pipe 17. This valve is shown in plan in Fig. 3. A spindle 20 terminates in two valves 22, 23, of which the valve 22 alone is normally on its seat. The passages 17, 18 are thus in communication with one another. When the spindle 20 is pushed inwards, the valve 23 is closed and the passage 18 is placed in communication with a port 27 in the spindle 20 which is open to the atmosphere. When the upper part of the chamber 19 is open to the atmosphere, the pressure beneath the piston 12 causes it to rise and close the valve 10. The valve 10 can thus be operated by hand bv means of the valve 21. A whistle 32 is provided to sound an alarm whenever the valve 10 closes. Steam is admitted to the whistle 32 through a valve 30 operated by a spindle 28, which is lifted by pins 33, 34 secured to the spindle 11. An ordinary hand-valve, adapted to be closed down upon the seat 7, may be combined with the automatic valve. To the stem of the hand-valve, a rod 40, Fig. 5, may be secured so as to slide up and down with the movement of the spindle. The rod 40 is provided with a projection 42, which engages a projection 43 on the spindle of the valve 21. The valve 21, and hence the valve 10, are thus simultaneously operated with the hand-valve.