SU20092A1 - Safety device for open steam boilers - Google Patents

Description

The invention relates to a preheater valve for open steam boilers, preventing excessive pressure build-up, provided with a float connected to a double balanced valve that opens the steam outlet to the atmosphere when water is raised, due to pressure build-up in the boiler.

In the proposed safety device, for the sake of simplicity and compactness of the device as a whole, as well as reliability, the valve body is supplied with four nozzles, from which nozzles one serves to communicate the valve chamber with the steam space of the boiler, the other for launching water under the float increase of pressure in the boiler, third for steam release into the atmosphere and fourth for water release: from the housing in case of a float device malfunction.

In FIG. 1 schematically depicts an axial section of the valve; FIG. 2-cut along ABCD and EF lines & FIG. one; FIG. 3- relative location of the safety valve in the boiler plant.

Housing K safety valve {Fig. 1 and 2) has a cylindrical shape supplied with two caps 1 and 2 according to

the ends, four nozzles 3, 4, 5 and 6 and four ears 7, 8, 9 and 10 to strengthen the device. The nozzle 4 enters the inside of body K in the form of a chamber with two saddles for a double balanced valve 12 fixed on the stem 13, on which the float 14 also sits. The ends of the stem enter blind seals 15 and 16, which also serve as guides for valve. Pipe 3 via pipe 15 (FIG. 3) communicates with the lowest level 16 of the boiler 17, pipe 4 through pipe 18 connects to the steam space of the boiler 17, pipe 5 through pipe 20 with a storage tank 21 for feeding the boiler and finally pipe 6 using pipe 22 communicates the internal cavity of the housing K with the atmosphere. During normal operation of the boiler 17, the water level in it is set somewhere on the horizontal 23, and in the pipe 15 it is somewhere on the horizontal 24. When the pressure in the boiler increases, level 24 in the pipe 15 rises, water enters through pipe 3 into the body K, as a result, the float 14 rises (floats), thus opening the double kapan 12, through which excess steam from the boiler 17 through pipes 18 and-22 escapes into the atmosphere.

When the pressure in the boiler 17 decreases, water from the housing K goes back through the pipe 15 to the boiler, and the float with the valve is lowered, and the steam space of the boiler is again separated from the atmosphere. In the event of any malfunction and inactivity of the valve, when the pressure in the boiler 17 rises above normal, & water through the pipe 15 also enters the device and, after a sunken float, rises to the limit level 19, after which it begins to overflow through pipe 5 and 0 into the reserve tank 21, from where the water is heated by gravity through the pipe 25 comes to the pump 26. The heated water is pumped by this pump back to the boiler 17, while the resulting steam leaves the tank 21 through the pipes 27 and 22 to the atmosphere. At the same time, the CBOHWE discarded water by noise gives the operator a knowledge that the pressure in the boiler is higher than normal, the safety valve does not. is in good condition and requires inspection and that the heated water, before it has cooled, should be pumped back into the boiler 17.

The subject of the patent.

A safety device for open steam boilers to prevent excessive pressure build-up, with a float connected to a double balanced valve opening steam out to the atmosphere when water rises due to an increase in pressure, characterized in that case K (Fig, 1) is provided with four nozzles, which nozzles are used: nozzle 4, - to communicate the valve chamber with the steam space of the boiler, 3-to start, water under the float with increasing pressure in the boiler, release of steam into the atmosphere and 5-to release water from the body a / 1 in case of malfunctioning float device.

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