US2393170A - Butterfly valve - Google Patents

Description

s. P. KlNNEY ETAL 2,393,170

BUTTERFLY VALVE Filed Jan. 5, 1944 2 sheets-sheet 1 I. HIII lllll Jan. 15, 1946.

Jan. l5, 1946 s. P. KINNEY E'f Al. 2,39370 BUTTERFLY vALvE`- v 'Filed Jap. 5, 1944 2 sheets-sheet 2 xNvENToRs SeZwyne. Kinn ey Louis M-Hartwik Patented Jan. 15, 1946 BUTTERFLY VALVE Selwyne P. Kinney, Grafton, and Louis M. Hartwick, Beaver, Pa., assignors to Selwyne 1. Kinney, doing business as S. P. Kinney Engineers,

Pittsburgh, Pa.

Application January 5, 1944,' Serial No. 517,039

(Cl. 13S-37) 13 Claims.

This invention relates to valves, and more particularly, though not exclusively, to valves for those industrial apparatus in which butterfly valves are normally used, and especially to valves used in conduits carrying high temperature gases.

The usual butterfly valve consists in a plate or disk having a peripheral outline substantially the same as the cross sectional form of the passage in which the valve is mounted to control the flow of fluid. The disk is rotatable on a diametrical axis, between a position in which the disk extends transversely of the passage and closes the passage to fiow, and a position in which the disk extends on the longitudinal center line of the passage, leaving the passage substantially unrestricted to flow. The disk is adjustable to flow-'controlling positions intermediate the two limits mentioned.

It will be understood that when the disk is in an intermediate position of adjustment the body of the disk is inclined to the axis of the passage, whereby the stream of uid flowing in the passage is deflected by the inclined body of the disk, causing the stream to impinge against the wall of the passage. If, as is the case in numerous industrial installations, the flowing stream of liquid or gas contains particles of abrasive material, or

by reason of its high temperature or composition is highly corrosive, the wall of the conduit on the downstream side of the valve is subject to the c destructive action of the deflected stream of fluid,

and `sooner' or later the wall of the passage is worn` to destruction. This circumstance, manifestly objectionable in whatever field of industry it is encountered, is particularly serious in the steel industry, where large refractory lined conduits carry hot gases laden with particles of ash, slag, metal, or ore.

As a specific example, the ue that carries the outgo gases of a blast furnace may be cited. These gases are hot, and entrained in them are substantial quantities of nely divided iron ore, known as flue dust. The flue is constructed of plate steel, lined with refractory material to protect the steel walls of the flue. 'The gases contain large quantities of carbon-monoxide, and they are cleansed of flue dust and used as fuel for the air-preheating stoves, steam-generating boilers, or other fired equipment of the blast furnace plant, The conventional butterfly valve, provided to control the flow between the furnace and the gas washer or flue-dust precipitator, is instrumental in causing rapid erosion of the refractory lining of the flue under the impngement yof the dust-laden gases, and it will be understood of the gases is relatively high, the refractory lining is rendered yet more vulnerable to the deleterious conditions.

The invention consists in the provision of a butteriiy valve which in open or partially open position concentrates the ow of the stream of flue gases ,more nearly towards the center of the valve structure and the longitudinal axis of the flue, whereby the objection noted is eliminated, or is so far reduced as to be inconsequential. Whereas the conventional butterfly valve consists in a single wing or disk mounted to swing on a diametrical axis, the butterfly valve of this invention comprises a pair of complementary wings or disk members. The paired disk members are severally mounted to swing between open and vclosed positions, and in open or partially open ence to the accompanying drawings, in which:

Figure i is a View in side elevation of a valve structure that embodies the invention;

Figure 2 is a view in medial and vertical section through the valve structure, with adjacent portions of the refractory lined flue in which the valve is included shown fragmentarily; and

Figure 3 is a transverse sectional view o-f the valve structure, on the plane III-III of Figure 2. The plane of section of Figure 2 is indicated at IIV-II in Figure 3. .Y

The body of the valve structure here comprises an annulus orcylinder 2, havingperipheral flanges 3 reinforced by means of angle webs 4. The body may be, and is here shown to be, cast integrally of iron or steel, and in the case of the exemplary blast furnace installation in mind, a cast steel of 12 per cent manganesecontent may be used. The plate steel body 5 of the iiue F, in which the valve is embodied, is provided with circumferential fianges E, and bolts or screws l secure the anges 6 to theiianges 3 and thus integrate the valve body with the flue structure. The steel wall of the flue is provided with the usual lining 8 of refractory material, and the internal cylindrical surface of such lining is flush with the inner surface of the annular body of the valve.

The butterfly valve per se of the structure is of bipartite construction, comprising a pair of wings orgates 9 and l0 which may be formed of ametrical edges of their semi-circular bodies` positioned adjacent to each other, in a common plane across the interior of the cylindrical valve Y body. The disks are shown inrsuch position in elevation in Figure 3 and inV vertical section in Figure 2. In this position of the vali/ eYnuerrlbers,

the passage through the flue is closed, not necessarily hermetically closed as herein illustrated,

and the flow of the flue-dust laden gases through the duct is blocked. The two valve membersor Wings are rotatable in their mountings from said closedposition into the open or partially open position shown indotted lines: in Figure 2, and it is important to note that in such` open position thevalve members 9 and I0 diverge in the upstream direction to thereby `form a somewhat funnel-like opening that isV aligned with the longitudinal axis of the iiue F and is effective across the entirewidth of the throat of the Valve body. By virtue of such feature of construction the flow through the ue With the valve in fully (or partially) open position is concentrated along the longitudinal axis ofthe liuc. The marginal -ilow of gas which occurs over the outer peripheral 'edges' of the valve disks flows into a space that diverges in a downstream direction and thus avoids direct impingement against the refractory lining. The gates or wings may be moved to an even more widely open position in which they curved as indicated at 9a and I 0a, respectively,

the direction of curvature being such as to provide a, rounded neck in the funnel of the open valve.

Itis to be noted that the axes, on which the valve members are rotatable between open and closed positions, are located at an interval from the diametrical or inner edges of saidA members Yor gates, and' that such interval is smaller or less than the interval between the axes and the opposite outer edges of the gates as may be seen in Fig. 2. The axes or stems of the valve disks may comprise shafts il andI 2 that extend across thev throat of the valve-body in spaced-apart and parallel relation, as shown in Figure 3. These stems are borne at their opposite ends in antifriction bearings E13 supported in housing portions H5, formed integrally with thevalve body 2.

Particularly effective means are provided for securing the valve gates to their rotatable stems or shafts, such means permitting the ready mounting and attachment of the gates upon the provided with suitable orices through which 1' such Cotter-pin keepers are driven. The tapered keepers engage the outer flat faces of the embraced valve stems with wedging effect, and provide perfect security of assembly. The split ends of thekeepersmay, after installation be spread, as indicatedlat 'H in Figure 3, to prevent them from becoming dislocated in service.

While it is possible that the valve gates may be rindividually rotated between open and closed positions, it is desirable that they be rotated in unison. Means. to this end comprise arms I8 and dnanner well understood in the art.

The inner edges of the gates are preferably provided with a rounded lip or head that resists corrosive action and retards splittingV or warping of the disk, while the reinforcing Vstructure formed by the webs and channels on the downstream faces of the gates. prevents warpage and provides added heat dissipating surface.

The buttery valve of the invention, while particularly desig-ned for the service indicated, will find utility in many other fields. Needless to say, various modifications and changes in the structure ofthe'valve described may be made Without departing fror'nthe spirit of the invention dened in the vappended, claims.

`We claim asour invention.;

l. A valve structure including a body forming a valve throat, two butterfly gates mounted in said throat to extend in substantially a common plane across saidthroat, saidgates being movable from such planeV into a funnel-like position to permit lGW centrally through said throat.A

stems, and affording facility of removal of the Y to reinforce the gate. The paired angemem# bers i5 form channels in which the valve stems 2, The structure of the next preceding claim, the bodiesV of, said: gates being curved towards-the edges that are adjacent when the `gates extend in said common plane, whereby turbulence of flow through the valve .in open position is minimized.

3. A valveV structure including a body: forming a valve throat, two.` valve stems mounted inf` said body and extending in spaced-apartparallel' relation acrosssaidthroat, two butteriiygates each having open channel'portions adapted to Vembrace one of saidv stems, lkeepers cooperating with the anges of saidI channel portions to secure said gatesone to each of said stems, said gates being complementary'in shape and adapted in flowthrott'lingposition to extend in substantially a common plane across-saidthr'oat, and means for turni-ngr said stems to swing said gates from said plane to open Aa passage for fiow between them.

4j. Agvalve structure including a diskarranged inthe throat of the valve, a stem'extending transverselypof theLvaix/ie throat, saidfdisu having flanges forming an open channel to receive said stem, and means anchored to said flanges for securing the diskin locked position on the stem.

5. A valve structure including a disk arranged in the throat of the valve, a stem extending transversely of the valve throat, said disk having flanges forming an open channel to receive said stem, said stem having a at surface, and means carried by said iianges and locked against said at surface to secure the disk to the stem.

6. A valve structure including a disk arranged in the throat of the valve, a stem of polygonal cross section extending transversely of the valve throat, said disk having members forming an open channel embracing said stem, and wedge elements locked in said members and wedged against a face of said stem to secure the disk to the stem. g

7. A valve for controlling the flow of high temperature gases comprising a body in the form of an annulus, a pair of shafts equidistantly spaced from a given diameter of said annulus and having their ends passing through the annulus, and a substantially semi-circular butterfly gate on each shaft and of a shape and area to substantially cover one-half the interior of the passage through the annulus.

8. A valve for controlling the flow of high temu perature gases comprising a body in the form of an annulus, a pair of shafts equidistantly spaced from a given diameter of said annulus and having their ends'passing through the annulus, and a substantially semi-circular butterfly gate on each shaft and of a shape and area to substantially cover one-half the interior of the passage through the annulus, said gates having plane faces in an upstream direction with the edge portions thereof which are along the meeting line of the two gates curved in a downstream direction from said plane, and a reinforcing structure on the downstream side of said gates.

9. A valve structure for controlling the flow of a iiuid comprising a body having a passage therethrough, and two gates each mounted to turn in said passage on an axis extending transversely and medially of the gate to swing between a position in which the two gates close the passage and a position in which the gates form a funnel-like passageway at the center of the passage.

10. A valve structure for controlling the ow of a fluid comprising a body having a passage therethrough, and two butterfly gates complementary in form and mounted in said passage with their axes in spaced relation to swing between a position in which the gates close the passage and a position in which the gates form in the passage a funnel-like passageway extending between said axes.

11. A valve structure for controlling the flow of a uid comprising a body having a passage of circular cross section therethrough, and two semi-circular butterfly gates mounted in said passage with their axes in spaced parallel relation and positioned to swing on said axes between a position in which the gates close the passage and a position in which the gates form in the passage a funnel-like passageway extending between said axes.

12. The structure of the next-preceding claim, the axis of each butterfly gate being spaced at a smaller interval from the inner than from the outer edge of the gate, and means for swinging the gates to Vpresent the larger end of said funnel-like passageway in upstream direction in the valve passage.

13. A valve structure for controlling the flow of a fluid comprising a valve body having a passage therethrough, and two butteriiy gates mounted in said passage with their axes in spaced parallel relation to swing between a position in which the gates close the passage and a position in which the gates form in the passage a funnellike passageway extending between said axes, the body portions of said gates that extend between said axes when the passage is closed being complementarily curved, substantially as described.

SELWYNE P. KINNEY. LOUIS M. HAR'I'WICK.

Images