US881871A - Regulating-valve for turbines. - Google Patents

Description

lmi'gamn I PATENTED MAR. 10, 1908.- R. H. R105.

REGULATING VALVE F O-R TURBINES.

APPLICATION FILED JUNE 4. 1907.

I w /i "W m Inn INVENTUR, RIEHAREIHRFE,

,DQ'M EiY I ATTY.

-To' all whom it may concerns particularly to valves used to regulate the ing a re ulated or controlled supply of mo- (county of Essex, State of Massachusetts,

I ines, of which the following'is a specificatron.

for example, as elastic-fluid turbines.

and the pressures to which the valve as a wvholeflissubjected are balanced when. the

its

A CORPORATION hionann n. RICE, or LYNN,

MASSACHUSETTS, ASSIGNOR TOGENERAL ELECTRIC COMPANY,

or NEW YORK.

REGULATING-VALVE FOR TURBINES.

1 Q Original, application filed. June 7, 1905, Serial No. 264,059. Divided and this application filed June 4, 1907.

' Serial No.

Be itknown that I, RICHARD H. RICE, a citlzen of the United States, residing at-Lynn,

have invented. certain "new anduseful Imrovements 1n Regulating-Valves for Tur- This application is a division of my pend ing application Serial No; 264,059 of June 7, 1905,.and is filed in' response to a re uirement for division made by the United tates Patent Office under the provisions of Rules 41 and 42 of oflice practlce.

My invention relates to valves and more supply-dimrjtive fluid to prime movers, such Its object is to improve the construction of the va ve so that the parts are readily assembled valveisYclosed and also when it is open and steam is'flowing, thus reducing the load upon the speed responsive device which controls the position of the valve, and to secure other advantages all as set forth in the following specification;

In the accompanying drawing illustrating one embodimentoi my invention, Figure 1 is a section through the valve and adjacent ortions of the turbine and Fig. '2 is an en, arged View of the valve and its seats.

The valve is shown as applied to an elastic-fluid turbine, but it may be used in connection with variousother machines receivtiveflui The casing 1 of the turbine incloses a bucket wheel 2 having one or more rows of peripheral buckets 3 against which. the-motive fluid is directed. When more than one row of wheel buckets are employed, as in'the present; illustration, stationary or movable intermediate buckets 4 are arran ed between the rows extending partial y or entirely around the wheel.

suitable source entering the passage or chamber- 5passes under the control of the valve 6 to the interior of the valve chest 7 and from thence it is directed against the buckets 3 by suitable discharge devices, such as nozzles or nozzle sections, arranged adjacent the periphery of the wheel in the plate 8 or other support. The valve chest 7 is attachedto the caslngg'l. The annular member 9 having a U-sliaped vertical section and containingthe chamber 5 and the valve seats, is removably secured in a shouldered recess in one face of the valve chest. This arrangement permits the seats to be readily removed for inspection and regrinding and facilitates the assembling of the parts. A cover 10 closes the opening in the top of the chest.

The regulating valve 6 is of the balanced type. It comprises a sleeve 11 formed with an annular flange 12 atits lower end. This flange constitutes one valve disk and a collar 13 fitted around-J the sleeve and resting on, the shoulder 14 serves as the other valve disk.

The flange and the collar both have the same area exposed to the motive fluid on the inlet side. The collar 13 is secured in lace by a cap 15 which screws on the externa ly threaded end of the sleeve. The valve stem 16 extends centrally through the sleeve and has at its up ejr' end a shouldered portion 17, which 1 ma e a removable collar, in engagement wit a counterbore at the upper end of the sleeve. This portion 17 and the cap 15 cooperate to prevent endwise movement of the valve on the stem. ,The cap 15 is provided with a transverse slot 18 and overhanging the end of the guide stem jaws which engagp e cover 10. The cap and 19 mount-ed in t stem maybe disengaged by relativemovew The stems 16 and 19 are ment' laterally. provided with a number of annular grooves which collect the moisture escaping from the valve chest and form hydraulic packings. Lubricant for the stems is fed to small annular chambers 20 in the walls surrounding the stems and passes therefrom along the stem' with the escaping fluid or moisture. At the outer ends of the stems are collecting chambers 21 for the condensed steam or moisture which'escapes along the stems from the valve chest. nected a pipe so that the upper chamber may dram'into the lower. From the lower 51368411101 other elastic-fluid from some chamber thewater of condensation passes These two chambers may be conthrough a pipe 22 into the. turbine casing.v l

The lower end of the stem 16 is connected withone arm '23 of a lever which is actuated by a suitable speed responsive device to vary the position of the valve and thereby control the supply of motive fluid to the turbine.

The regulating valve 6 is so constructed that a suitable throttling action is secured and the mpact and reactive etfects of flowing steam do not disturb the balanced condition of the valve when it is open.

p The throttling actionis due to the beveled portion of the disks 12 and 13 and the corresponding por-.

tions 2 of the seat-containing walls 25. Thus when the horizontal surfaces 26 of the seats and the corresponding surfaces of the disk are separated by a given distance, the width of the annular flow space between the beveled surfaces will be but substantially from the annular region 28 passes over the surfaces 24 and 26 and flowm upward impinges on the annular surface 0% the flange 30 formed on the cap 15 for this purpose and balances the action just described. Hence the balanced condition oi: the valve is "not disturbed by the impact of the flowing steam when moved from its balanced closed position "to its open position. Steam. flowing from the region 28 over the surface 24 will impinge against the valve seatwhich is stationary. Iniss'uing at high velocity from the space between the valve and its seat into the region of low velocity in the chest, the steam will also react against thesurface of the-seat but not against the valve. Thesame remarks apply to the steam issuing in the other directionirom the re ion 27 and flowing into the region of low velocity in the valve chest.

With the mechanisnr described, the nor-, mal load changes are taken care of by the reg ulating valve, which with'variation in the rotative speed, has a slight reciprocating or to-and-fro movement whereby t 1e admission of motive fiuld to the turbine nozzles 1s mcreased with decreased speed of the turbine and'decreased as the speed increases. If for any reason the speed rotation should become excessive, the emergency governor shown in my pending application'Serial No. 264,059 referred to above, is called into play'and'cuts off the entire supply of motive fluid to the turbine.

TVhile a turbine ofthe well known Curtis type has been described, it is obviously within the scope of my invention to employ it with other' rime movers or with any other type of tur ine whether the same be of the axial or radial flow type or a combination of both types.

- In accordance with the provisions of the patent statutes, I have described the principle of operation ofmy invention, togetl1er with the a paratus which I now' consider to I esire to have it understood that the ap aratus shown is only illustrative and t rat the invention can be carried out by other means.

What I claim. as new and desire to secure by Letters Patent of the United States, is,-

1. The combination of a stem, a balanced valve mounted on the stem, seats for the valve, and a flange on the valve against which the stem impinges when the valve is opened to keep it balanced under the action of the flowing steam upon it.

'2. The combination of a valve having two disks, seats engaged by the disks and having a chamber between them which receives the steam and from which it flows outward in o posite directions over said seats when tie valveis open, and a flange on the valve beyond one of the seats on which the flowing steam impinges and balances the impinging action of the steam upon the valve disk which is adjacent the other seat.

3. The combination of a-valve comprising a sleeve having an annular flange which forms a valve disk, a valve seat above the disk, a collar mounted on the sleeve which forms a second valve disk, a valve seat above the second disk, a chamber between the valve seats from which the steam flows outward in opposite directions over them, a cap which secures the collar in place, and a flange on the cap above the last named seat against which the steam impinges as it flows outward over it. 1

. 4. A balanced valve comprising a sleeve having an annular flange which forms a valve disk, a collar mounted on the'sleeve which forms a second valve disk, and a cap which secures the-collar in place.

' 5. The combination of a' valve stem, a sleeve onthe stem having a valve disk at one end, a shoulder on the sleeve, a collar engaging the shoulder, a valve disk on the collar, a

cap screw-threaded to the'end of the sleeve beyond the collar which'sccuresthe sleeve to the stcmand holds the collar against the having beveled edges, beveled seats with which the disks cooperate, a removable cap on the end of the sleeve which secures it to the stem, a guide stem, and a connection be-. tween the cap and the guide stem.

7. The combination of a stem havin acollar secured to. it at one end, a sleeve through which the stern passes, the sleeve being pro vided witha counter-bore at one end to rere iresent t e best embodiment thereof; but

shoulder, jaws upon the cap, and a guide ceive thecollar, valve disks on the sleeve, 1

semen; 3

seats with which the disks coperafoe, a; cap Inwit'ness whereof, 'I have hereunw se tmy scnilwmhreaged to' the eirildjof the sleeve to 121t hand this firs; day of June 1907.

tac it to te Stem, a ange-on the cap el l yond the seat, a guide stem, and a connection I RICHARD RICE '5 between the cap and the guide stem which Witnesses":-

I permits them 'to bedisconnectecl by a rela J Joint} A. MCMANUS, J13, tive movement laterally.- -PHILIP F; HARRINGTQN.

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