US2037978A - Oil and steam regulating valve - Google Patents

Description

Apxrfifl 21, 1936., s. M. HANSEN 2,3?,97&

OIL AND STEAM REGULATING VALVE Filed July 25, 1954 s 'l'e am Fuel Dale 4 o Burner IHVEHTUR S}US M.HGH en BY 4/46 M ATTURN EY Patented Apr. 21, 1936 EJNITED STATES PATENT oFFicE 1 Claim.

The present invention relates to improvements in fuel valves for the regulation of steam supply, and more especially for steam supply systems wherein there is an intermittent demand for high heat, as in garment pressing applications, restaurant heaters, etc. Heretofore, such devices have been regulated by valves which are in theory responsive to the pressure of the steam to out down the fuel supply to the burner, thus indirectly providing a floating regulation of the supply of steam between predetermined limits of steam supply pressure and fuel supply pressure. In practice, however, the regulation obtained by such valves has not been satisfactory as the range of variations has been too wide, and the lack of more accurate regulation has been a potential fire-hazard. For example, certain devices of the prior art designed to do the work required, it has been customary'tdprovide a packing between the steam side and the fuel side of the valve. This packing has the disadvantage that it usually leaks and as a consequence, the regulation is destroyed and the results are deceptive to such a degree that the boiler may blow out. In some devices, also, the control of fuel to the burner is accomplished by means of a needle valve which cuts down the amount of fuel admitted to the burner by restricting the fuel passages. By my present invention I eliminate altogether the requirement for the use of a packing and, furthermore, the area of the fuel passages to the burner is always constant, the control of the opening and closing of the fuel valve being accomplished by a special provision of my invention to afford close regulation thereof in response to the variations in pressure of the steam supplied to a bellows or sylphon actuating device for controlling said fuel valve. Thus, the regulation involved is accurate and dependable; also, the structure is a far cheaper one to build from a manufacturing standpoint. My invention will be more clearly understood by referring more specifically to the accompanying specification and drawing in which Fig. 1 is a sectional elevation of my improved valve; Fig. 2 is a view of the steam inlet coupling flange; Fig. 3 is a partial sectional view on line A-A of Fig. 1; Fig. 4 is a partial section taken on line B-B of Fig. 1 showing the fuel passage around meteringpin adjustment, and Fig. 5 illustrates in partial section the steam actuated bellows or sylphon for controlling the regulation of the fuel supply in response to the pressure of the steam.

Referring more specifically to the various figures of the drawing I, Fig. 1 represents the valve casing in which is a sylphon or bellows 2 of suitable metal secured within the casing by means of the steam inlet flanged head 3, secured to the flanged head 2 by means of the gaskets 4 and coupling-bolts 5. A passage 4 admits steam from the boiler (not shown) to the inside of the sylphon or bellows 2. The inner end of this bellows is seated in what may be called a sylphon head 6 within the valve casing I, a portion of the head being reduced in cross-sectional area to provide a chamber I to receive oil leakage around metering-pin 8 resting on the sylphon head 6 and held in contact with bellows 2 by spring 6. The oil which leaks into chamber I has an outlet passage 9 into oil by-pass passage Ill. Thus, by-passing of the leakage oil in chamber 'I prevents the building up of back pressure of said oil on the steam sylphon or bellows 2, which would otherwise destroy the regulation by the amount of this leakage and corresponding back pressure. For example, if the bellows 2 was set to operate at sixty pounds to open the fuel valve and there should be a leak of oil into chamber 1 sufficient to build up a back pressure on the bellows 2 equal to say, five pounds, then although the bellows 2 may be set to operate at sixty pounds to open fuel valve I6, the fuel valve I6 would not actually be opened until the steam pressure was sixty-five pounds.

In the right hand end of the main valve within the casing I is another chamber II closed by a valve-cap I2 screwed into the casing I. The wall of the chamber II is screw-threaded to receive the valve-cap I2 and the pressure regulating nut I3. The latter is chambered to receive a spring I4 which abuts at one end against a flange I5 on a secondary valve I6 which controls the passage of the fuel to the inlet passages I! and I8 to the burner (not shown). The fuel inlet passage I'I communicates with an oil chamber I9 and passage 20 leading to by-pass II] which by-passes oil back to the oil supply tank. Valve I6 is provided with an adjusting-screw 2| to control the pressure on the sylphon or bellows 2 for regulating the steam pressure required to open fuel Valve I6 against the action of spring I4. The fuel valve I6 in turn may be regulated by screw I3. In order to regulate screw 2!, capscrew I2 and screw I3 are first removed and after screw 2| is regulated, screw I3 and screw I2 are replaced. In order to regulate screw I3 it is only necessary to remove capscrew I2. The meteringpin 8 is guided in a suitable bearing in the casing I, and when the steam pressure rises to the predetermined amount to open valve I6 the pin 8 then abuts against the end of adjusting screw 21 forcing valve l6 open.

The operation of my invention is as follows: Assuming that it is desired to set the fuel valve IE to operate at twenty-five pounds oil pressure when the steam pressure is sixty pounds. Capscrew [2 is removed as is also regulating nut l3, and screw 2| is adjusted so that metering-pin 8 will abut against its left hand end when the steam pressure is sixty pounds, thus opening fuel valve is. If it is desired to adjust the pressure of spring l4 against flange l5, regulating nut I3 is again replaced and adjusted to control the pressure of said spring to the predetermined amount. Cap screw 12 is subsequently replaced. There is now a pressure of twenty-five pounds on the oil from the fuel supply tank, the predetermined pressure of oil for operating the burner and just below sixty pounds steam pressure valve I6 is open. Should the steam pressure rise to sixty pounds or above, metering-pin 8- is actuated by bellows 2 to push on the end of screw 2| and open valve l5, thus lay-passing oil into by-pass passage 20 and bypass passage whereby it returns to the oil supply tank. Thus, when the pressure of the oil tends to exceed twenty-five pounds or that pressure for which it has been set to operate, valve l6 opens and permits some of the oil to be returned to the oil supply tank. Thus, a regulating valve is provided whereby the relation of steam and oil pressures may be definitely controlled in a relatively'simple, positive and inexpensive manner. If a packing around metering-pin 8 was depended upon to seal off the oil from chamber II or from inside nut [13, oil might leak into chamber 1 and build up a back pressure on bellows 2, but because of the fact that I allow oil to leak around metering-pin 8 into chamber 1, and prevent sufficient oil to be by-passed through equalizing passage 9 into by-pass 10, no packing is necessary and no back pressure of oil has to be contended with.

In accordance with the provisions of the patent statutes, while I have described the principle of operation of my invention in a specific manner, it is to be understood that I do not limit my invention thereto since other modifications thereof may be made by those skilled in the art without departing from the spirit and scope of my invention.

What I claim and desire to secure by Letters Patent of the United States is:

A regulating valve for steam boilers supplied with oil fuel comprising a secondary valve responsive to oil pressure, a bellows, an inlet passage admitting steam within the bellows, a head for receiving the inner end of the bellows, an adjusting screw in the secondary fuel valve, a metering-pin resting on the bellows receiving head and line with one end of the adjusting screw in the fuel valve, a casing for the valve enclosing a chamber within the casing for leakage oil around the bellows receiving. head, a spring around said head, and a second spring around the fuel valve for adjusting the pressure on the latter, adjusting nut for regulating the pressure on said spring, an oil chamber around the fuel valve, a removable cap screw for affording access to the adjusting devices adjacent the secondary valve, a by-pass passage for returning oil from the fuel valve chamber to an oil supply tank, an inlet passage to an oil burner connecting udth said latter chamber when the fuel valve is open, and an equalizing passage connecting the leakage oil chamber around the steam pressure responsive device with the by-pass passage whereby back pressure of oil on the bellowsis avoided.

SINIUS M. HANSEN.

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