US541127A

US541127A - smith

Info

Publication number: US541127A
Authority: US
Publication date: 1895-06-18
Anticipated expiration: 1912-06-18

Description

2 Sheets-Sheet 1.

(No Model.)

J. G. SMITH. GAS GUVBRNOR. No. 541,127. Patented June 118, 1895.

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J. G. SMITH. GAS GOVERNOR.

2 Sheets-Sheet 2.

(No Model.)

No. 541,127. Patented June-1a, 1895.

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l UNITED STATES PATENT OEEIOE.

JOHN GEORGE SMITH, OE MONTREAL, CANADA.

GAS-GOVERNOR.

SPECIFICATION forming part of Letters Patent No. 541,127, dated June 18, 1895. Application filed November 20,1894. Serial No. 529,417. (No model.) Patented in Canada July 9, 1.894, No.46,530.

To @ZZ whom t may concern.-

Beit known that I, JOHN GEORGE SMITH, of the city of Montreal, in the district of Moutreal and Province of Quebec, Canada, have invented certain new and useful Improvements in Gas-Governors, (for which I have obtained Letters Patent of the Dominion of Canada, under No. 46,530, granted July 9, 1894;) and I do hereby declare that the following is a full, clear, and exact description of the same.

This invention relates to gas governors having inverted cup shaped floats with their edges dipping into sealing fluid and carried by the inlet valve stem, the object being to secure a governor the inlet-valve of which will be balanced or held practically in equilibrium by the gas pressure and consequently be more responsive in its action to slight changes in the pressure or' quantity of gas used.

The invention consists of a gas governor constructed and arranged to allow of the introduction of the initial body of gas between two iioats differing in area for the purpose of controlling the inlet valve, and for full comprehension thereof, reference must loe had to the annexed drawings, forming a part of this specification, in which like symbols indicate corresponding parts, and wherein- Figure lis a vertical section of the governor, and Fig. 2 a horizontal section thereof, each section being taken respectively on a line a: in the other figure.

I have ascertained byexperiment that for the valve to work properly and upon the slightes t fluctuation of pressure, it is necessary to balance it in some Way or hold it in equilibrium upon such iieXible cushions as the gas itself canfurnish and to this end I use a pair of ioats attached at different heights to the valve stem and introduce a body of gas' between them.

Any suitable form of casing can be used provided two gas chambers are furnished each of which has a float above it and I prefer to use the form of construction of casing and parts shown in the accompanying drawings and which I will now describe in detail.

a is an annular hollow casing or section having inlet opening b and outlet opening o in opposite sides, separa ted bya partition d having a horizontal and a vertical portion, and

the horizontal portion containing an inlet aperture d controlled by the usual valvee, the bottom of the cast-ing having a suitably covered aperture a through which the valve e can be reached when desired, and the upper portion a2 of the casting having an annular trough a3 for sealing duid and being perforated for the passage through it ot' the valve stem e'.

f is a second annular casting or ring having a downwardly projecting flange f', screw threaded interiorly to take onto the screw threaded upper edge of the casting a so thatit will be located above this latter, also having a trough fsimilarfto the oneo,3 for containingfa/second body of sealing fluid, and further having a bar f3 perforated to act as an upper guide for the valve stem e. Resting on this second casting or section is any suitable top or cover piece g.

h is a float of the usual inverted cup type secured in the usual way to the'valve stem e at such a point that its edges will playin the sealing fluid in the lower trough 0,3, and j is a second float of a similar form also carried at a higher point by the stem e so that its edge will dip in the sealing fluid ot' the upper trough f2 and on which the usual interchangeable weight 3 is placed.

The space inclosed bythe casting a and the lower float h constitutes on the inlet side of the partition d a lower main gas chamber and on the Opposite or outlet side of the partition a delivery chamber, while the space between the top of iioat h and the under side of iioat 7' constitutes an upper or secondary gas chamber Z and the dividing wall of the casting a be- J tween the main and secondary chambers is pierced near the main inlet b to aord a passage m through which gas can reach the chamber Z.

The operation of the governor is as follows: When a large call or drain is made upon the governor the incoming gas rushes as it were, into a void and expanding itself reduces the pressure on the under side of the lower oat h, thereby oifering less resistance t-o the depressing .Weight valve e to descend (which being in eclnilib` rium it easily does) and so lets in gas according to the requirement. When less gas is This causes float and,

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called for, the pressure increases at the governor and acting on the under side of neat h,

maintaining one equilibrium and the low pressure the other.

The low pressure equilibrium is formed by the weight 3 on top of float acting proportionately downward, to the upward pressure on the under side of bottom float h.

The high pressure equilibrium is formed bythe incoming gas entering'rthe secondary chamber andvacting between the two floats k and j, the difference of whose areas' is equal to the area of the valve e. This differential area through the medium of the initial gas maintains a downward pressure on the top of the float hequal to the upward pressure on the under side of valve e. Thus there are two equilibriums established, each acting independent of the other.

From the foregoing' it will be readily apparent that the body of gas in the upper chamber entering from a point close tothe main inlet is at a higher pressure than the body of gas in the delivery chamber on the outlet side of the partition d owing to the passing of large quantities of the latter body through the outlet c but at the same pressure as the bodyof gas in the main chamber beneath the Valve, and consequently I find it desirable to establish a difference in vthe comparative areas of the twofioats making the upper float less in area preferably by diminishing the di= ameter thereof, in order to secure a downward pressure upon the valve through the gas in the secondary chamber bearing upon the upper surface of the lower float, equal to the upward pressure of the gas in the main chamber beneath the valve.

What I claim is as follows: y

1. A gas governor of the class described having a main gas chamber or passage leading to the delivery outlet, a valve controlling the inlet to said main chamber, and a secondary gas chamber, the latter in communication with the main gas supply so as to contain a body of gas adapted to exert a pressure upon a pair of valve operating tioats, one acted upon upwardly and the other downwardly, equal to the pressure upward of the main or initial body of gas beneath the valve and upon the under side of the lower iioat on the lower pressure side, for the purpose set forth.

2. A gas governor of the class described having a main gas chamber or passage leading to the delivery outlet and a secondary gas chamber, the latter to contain a body of gas of the same pressure as that of the main body of gas, and the valve operating parts of which, comprising a stem and pair of sealed floats, are acted upon by the gas in said secondary chamber so as to be depressed by same, for the purpose set forth.

3. A gas governor having a main gas chamber or passage and a secondary gas, chamber,

the latter to contain a body of gas of the same pressure as the main body of gas, a valve to regulate the flow of gas from said main chan1- ber, an operating stem for said valve with a pair of floats secured to said stem and constituting the bottom and top of said secondary gas chamber and suitable sealingtroughs for said float-s.

4. A gasgovernor having a casing with inlet and outlet and communicating passage between, a 'valve to regulate the ilow of gas from such main chamber, a stem carrying such valve, a pair of floats also carried by said stem gas of the same pressure as the main body thereof between said floats for the purpose set forth. Y

5. A gas governor of the class described having a main gas chamber or passage and a secondary gas chamber in communication with each other,- the latter to contain a body` of gas of the same pressure as that of the main body of gas and the valve operating parts of which, comprising a stem and pair of sealed floats differing in area, are acted upon by the gas in said secondary chamber for the purpose set forth.

6. A gas governor of the class described having a main gas chamber, a delivery chamber and a secondary gas chamberthe latter in communication with the main chamber and adapted to contain a body of gas of equal pressure to the gas in the main chamber, a

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valve to regulate the now of gas from such Y main chamber, and operating parts for said valve comprising a stem and pair of sealed floats, one of which latter forms the top to said delivery chamber and the other of which forms the top of said secondary chamber, the

its upper surface, and a guide integral with such second section for the upper end of the valve stem, a valve for controlling the flow of gas through said valve aperture, a valve stem carrying said valve and a pair of floats carried by said stem and having their edges dipping in said sealing troughs, the upper wall of said main section being perforated at one or more points near the main inlet, for the purpose set forth.

8. In a gas governor, the combination with a suitable casing providing a main chamber, a delivery chamber and a secondary chamber, the main gas chamber having an inlet and the delivery chamber, an outlet, with a communicating passage between such main chamber and delivery chamber, and a secondary inlet from said main chamber to said secondary gas chamber, of a valve to regulate the flow of gas through said communicating passage, such valve being carried by a suitable stem, oats also carried by said stem and constituting the tops respectively of ,said secondary and delivery chamber and sealing troughs for such floats.

9. A gas governor of the class described having an inclosing casing anda valve axed to a spindle upon'which two Iioats or inverted diaphragms are attached, the oats being of dierent area and one acted upon upwardly and the other downwardly by gas of the initial pressure in such a manner that through the medium of said fioats and the initial pressure of gas, the controlling valve is held in equilibrium.

10. In a gas governor of the class described having a valve affixed to a spindle and a pair of floats differing in area carried by such spindle, an inclosing casing affording chambers and passages for the introduction of the initial body of gas between said iloats for the purpose of controlling the inlet valve.

JOHN GEORGE SMITH.

Witnesses:

FRED. J. SEARS, R. A. C. KIMBLE.