US2270094A - Feed water regulator - Google Patents

Description

Jan. 13, 1942. v. v..vEENscHoTEN 2,270,094

FEED WATER REGULATOR l l l Filed Aug. 4, 1959 2 sheets-sheet 1 Jan. 13, 1942.

v. v. vEENscHol-EN FEED WATER REGULATOR Filed Aug. 4, 1939 2 Sheetsf-Sheet 2 InvenTor-z V Veena choe n.

ATE.

Patented Jan. 13, 1942 FEED WATER REGULATOR Vincent V. Veenschoten, Erie, Pa., lassignor to Northern Equipment Company, Erie, Pa., a corporation of Pennsylvania Application August 4, 1939, Serial No. 288,338

1 Claim.

This invention relates to boiler systems, and it has for its object providing improved means for feeding water to the boiler automatically and in accordance with the water and steam conditions of the system. In the proper operation of boiler systems it is desirable to feed Water to the boiler in response to the variations in the water level elevations in the boiler, so as to keep the level always within a certain range; and, as material changes in steam consumption affect materially the water needs and hence the Water level, it is desirable to feed the water more or less in response to these steam changes. Hence the general object of my invention is to feed the water in response to water level changes in the boiler and concurrently in response to steam changes.

The specic object of my invention is to provide suitable apparatus for concurrently and automatically controlling the flow of Water to the boiler in response to both water level and steam flow changes. Other objects of the invention will be apparent from a consideration of the accompanying drawings and the following description thereof.

Of the drawings Fig. l is an elevation, more or less diagrammatic, of a boiler system which embodies some of the features of my invention: Fig. 2 illustrates a somewhat modified system; Fig. 3 is an enlarged sectional View of a portion of the apparatus of the system; Fig. 4 is a materially enlarged central sectional view of the feed water valve and controlling means of the system; and Fig. 5 is an elevation thereof at 90 therefrom.

Fig. l shows diagrammatically the boiler 6, the feed water pipe 1 thereof, the feed water valve 8. The valve is operated by the controlling apparatus 9. This controller is affected by the water level changes in the boiler by means of the feed water regulator IIJ. The controller is also affected by the steam ow from the boiler by any suitable means.

The controller 9, Fig. 4, comprises a casing I6 in the Wall of which is rotatably mounted a rod I'I. Fixed to the rod, within the casing is an arm I8 arranged to operate, in any ordinary manner, the plunger I9 of the feed water valve 8. Also fixed to the rod I1, outside the casing is an arm 2D which is arranged to be operated by the regulator III by means of the motor I5 the rod 22 and the floating lever 23.

While any suitable means responsive to the steam flow from the boiler may be used to assist in operating the valve 8, yet in this instance I take advantage of the fall in steam pressure between the inlet and theoutlet of the superheater 25, Fig. 1. Connected respectively to the inlet and the outlet of thesuperheater are pipes 26 and 2l. The differential pressure thus produced in these pipes is applied, in an ordinary manner, to the diaphragm 28 of the controller 9 and this diaphragm operates, in an ordinary manner, the arm 29 which is fixed outside the casing 30 to a rod 3| rotatably mounted in the casing wall. A link 32 connects the arm 29 with the end of the lever 23; and a link 33 connects the central portion of the lever 3'3 with the arm 20.

The regulator I9 comprises a casing 49, partly lled with a suitable liquid. A pipe 42 connected to the boiler 6 materially above and below the Water level therein, passes through the casing 4I, and hence the water from the boiler will pass into the lower portion of the tube and the water level in the tube will be substantially the same as in the boiler. The lower end of the casing 49 is connected, by a pipe 43 with the motor I5. As the water sinks in the boiler, and hence in the casing 4U, the liquid 4I will be heated more by the steam in the tube 42, and the pressure transmitted to the motor I5 will cause the valve 8 to be opened more.

The'motor I5 comprises a diaphragm casing 45 having therein a diaphragm 46. To the dia` phragm is attached the rod 22. When the pressure in the casing 45 is increased by the operation of the regulator III, the diaphragm and rod 22 will be pushed down against the force of the spring 41, thus operating the lever 20 and elevating more the plunger I9, of the feed water valve. In case of a rise in the water ylevel in the boiler and hence in the tube 42 the pressure in the casing 4I) will decrease, and there will be a corresponding lowering of the plunger I9 of the valve.

The apparatus of Fig. 2, is substantially similar to that of Fig. 1, except that the floating lever 23 is replaced by a pulley. A chain 5I is connected to the rod 22 of the motor I5, and, passing under the pulley 5I), lis also connected to the arm 29 of the controller. It Will be seen that With this arrangement the operation will be substantially the same as with the floating lever 23, the pulley acting as a floating lever.

It will thus be seen that the water level responsive means and the steam flow responsive means will at all times affect the valve opening entirely independently of the other means. If either of these means is rendered inoperative the other means will continue to control the valve opening just as it did before. For instance the water level apparatus may be rendered inoperative by shutting the valves 35, and the steam flow apparatus by closing the valves 36.

Also, when the steam pressure, and hence temperature, in the boiler varies the heat received by the liquid 4| will vary accordingly and hence the pressure in the casing 40. In case of an increase in steam pressure, there will be an increase in the pressure transmitted to the motor I5, and this will cause the feed Valve 8 to be opened more, passing more water to the boiler and thus tending to keep more uniform the pressure in the boiler. The amount of this eiect can be varied by varying the amount of liquid in the casing 40, and also by varying the elevation of the casing with reference to the boiler. Raising the casing or the liquid therein will increase the amount of liquid exposed to the steam effect, and hence will increase the effect of the steam on the valve opening.

I claim as my invention:

A feed water valve for boiler systems, comprising a casing having a valve housing in the base thereof, a valve controlling flow of feed water through the housing, an operating arm connected to the valve, a rock lever pvoted to the operating arm and having a portion extending externally of the casing, a dividing wall sealing the upper portion of the casing from the valve operating arm, a diaphragm dividing the upper portion of the casing and providing an upper and lower compartment, an operating arm associated with the diaphragm extending into the lower compartment, pivotal means connected through the operating arm in said lower compartment and extending externally of the casing, diierential pressure means adapted to be connected to and register steam flow variations in the system, and means externally of the casing linking both said operating arms whereby a continuous and modulating control will be effected responsive both to water level variations in the boiler and steam ow variations` in the system.

VINCENT V. VEENSCHOTEN.

Images