USRE24534E

USRE24534E - By-pass flow washer

Info

Publication number: USRE24534E
Authority: US
Publication date: 1958-09-16

Description

s ept. 16, 195.5;` RR'. DAHL Re. 24,534

BY'PASS FLOW WASHER n Original Filed Oct. 30, 1953 @uw W4/A, Egg@ Reissued Sept. 16, 1958 BY-PAss FLOW WASHER Robert R. Dahl, Chicago, Ill., assgnor to The Dole Valve Company, Chicago, Ill., a corporation of Illinois Original No. 2,728,355, dated December 27, 1955, Serial No. 389,209, October 30, 1953. Application for reissue October 4, 1957, Serial No. 688,816

Claims. (Cl. 13S-45) Matter enclosed in heavy brackets appears in the original patent but forms no part of this reissue specification; matter printed in italics indicates the additions made by reissue.

arranged to by-pass uid around the llow control member at low pressures and to close the by-pass passageways and pass fluid through the central orifice of the ow control member at high pressures.

Another object of -my invention is to reduce the threshold pressure of flow control washers at low pressures by providing by-pass passageways along the sides of the ow control member and -contouring the downstream face of the flow control member to form 1a valve seating against a shoulder of the passageway in the ow control member, to close the by-pass passageways upon predetermined increases in pressure on the vupstream face of the flow control member.

A further object of my invention is to provide a novel and improved form of a resilient flow control member in which the control of the ow of fluid is obtained by exing of the flow control member against a shoulder in a fluid passageway by the pressure acting on the upstream yside thereof, and in which the downstream face of the ow control member is recessed in spaced relation with respect to the shoulder, and a plurality of by-pass passageways `are provided in the periphery of the How control member and opening into the recess on the downstream face thereof, 'toA accommodate the by-pass of fluid past the central orifice of the ow control member at low pressures, and to accommodate the ow control member to move into engagement with the shoulder and block the by-pass of uid along the sides of the ow control member `at high pressures, and then control the flow of fluid by the ilexing of the main body of the ow lcontrol member inwardly toward its center and outwardly along the shoulder, yto reduce the crosssectional area of said orifice as the pressure thereon increases.

A further object of my invention is to provide a novel and improved form of flow control device in which a resilient annular flow control member is seated against a shoulder in a passageway and is so arranged as to by-pass fluid past the periphery of the flow con-trol member at low pressures and to block the passage of fluid along the periphery of said ow control member at higher pressures, and control the ow solely by flexing of the flow control member into engagement with the shouldered seat thereof.

A still further object of my invention is to provide a more eicient and simpler form of ow control member having by-pass passageways along the periphery thereof to pass uid at low pressures along the sides thereof, and contoured on the downstream face thereof -to Ibe free from the seat of the flow control member and accommodate fluid to pass thereby through said by-pass passageways at low pressures and to block the passage of uid thereby at higher pressures and restrict the crosssectional area of the central portion thereof to effect a constant delivery rate through said flow control member for a wide range of pressure variations without deformation of the flow control member beyond either fac'e thereof.

This application is a companion application to my application Serial No. 389,210, led herewith and entitled Flow Control Structure.

These and other objects of my invention will appear from time to time as the following specification proceeds and with reference to the accompanying drawings ywhere- 1n:

Figure 1 is a fragmentary cross-sectional view taken through a uid flow passageway, showing a flow cont-rol member constructed in accordance with my invention in la. passageway in a relaxed position, with no Huid pressure on the llow control member;

Figure 2 is a view somewhat similar to Figure 1, but showing the llow control member in a flexed condition, effected by the pressure of lluid acting on the upstream face and sides thereof; and

Figure 3 is a bottom plan View of the ow control member shown in Figure 1.

In the embodiment of my invention illustrated in the drawing, I have shown a portion of the casing 10, which may be a valve body, a conduit or the like. The casing 10 is shown as having an enlarged diameter passageway 11 leading therethrough for a portion of the length thereof, and terminating into a reduced diameter axially alined passageway 12 which may be connected with a valve or a iluid delivery pipe or conduit or the like.

At the junction of the enlarged diameter passageway 11 with the reduced diameter passageway 12 is a shoulder 14 extending at right angles to the walls of said passageway and having a relatively large cross-sectional area compared with the cross-sectional area -of the outlet passageway 12. The shoulder 14 is shown as forming a seat for a resilient annular flow control member 15. Spaced from the upstream side of the flow control member 15 is a retaining ring 16, which may be a snap ring and may be snapped into position in the inlet passageway 11, to retain the flow control member to the seat 14. The retaining ring 16 is shown as being spaced from the seat or shoulder 14 a distance suicient to accommodate a limited freedom of movement of said How control member between said seat and retaining ring.

The `annular ow Icontrol member 15 may be made from a resilient -or elastic material, such as rubber or one of the well known substitutes for rubber, such as neoprene, and the like, so as to readily be flexible in a downstream direction into engagement with the shoulder 14 upon increases in the pressure of Huid acting thereon through the inlet passageway 11.

The flow control member 15 is shown as lla-ving `a relatively at face 17 on its upstream side when in a relaxed condition and as having a central opening or orifice 19 leading therethrough, axially aligned with the outlet 12 and of a smaller cross-sectional area than the cross-sectional area of the outlet 12.

The ow control member 15 is also shown as having a uniformly contoured or rounded shoulder 20 leading from the upstream face 17 to the orifice 19, to provide a uniform relatively smooth orice for all degrees of exure of said flow control member. The flow control member 15 also has an outer wall 21 fitting within the passageway 11 and having an inwardly tapered lower end portion 22, tapering inwardly to provide a space between the wall of the passageway 11 into which the flow control member 15 may flex upon increases in pressure acting on the upstream face of said ow control member.

The-outer wall 21 of the flow control member 15 is provided with a plurality of by-

pass passageways

23, 23, shown as notches of a generally semi-circular form opening to the periphery of said flow control member, for passing fluid at low pressures around the side of said ow control member. It should be understood that while the by-pass passageways 23 are herein shown as being generally semi-circular, that they need not be so shaped but may be of any form desired.

The downstream face of the flow control member 15 is shown as being contoured or recessed inwardly of the wall thereof, to form a plurality of

segmental ribs

24, 24 extending along the periphery thereof to the by-

pass passageways

23, 23, the outer margins of which ribs are formed by the inwardly tapered outer wall portion, 22. The

ribs

24, 24 serve to space the contoured portion of the downstream face of the flow control member 15 in spaced relation with respect to the shoulder 14, to accommodate the free passage of fluid through the by-

pass passageways

23, 23 into the outlet passageway 12, upon low pressure conditions in the inlet passageway 11.

Within the

ribs

24, 24 on the downstream face of the flow control member 15 is a generally annular downwardly opening passageway 25, terminating at its inner margins into segmental projections or

ribs

26, 26 and into outer depending

lips

27, 27 of a recessed or concave face 29. The recessed or concave face 29 is shown as being in the general form of the frustum of a cone terminating at its inner margins in an annular shouldered recess 30 at the downstream side of the orifice 19.

The

segmental ribs

26, 26 and

lips

27, 27 are spaced downwardly from the bottom portion of the llow control member defining the top of the channel 25 and form control edges and a valve means engageable with the shoulder 14 upon increases in pressure on the upstream surface and sides of the flow control member 15.

It may be seen from the foregoing that as the pressure of the fluid acting on the upstream face 17 and sides of the flow control member 15 increases, said flow control member ilexes in the direction of the tlow of fluid through the orifice 19 toward the shouldered seat 14, first bringing the

segmental ribs

26, 26 into engagement with the shoulder and then bringing the

lips

27, 27 into engagement with said shoulder, and restricting the cross-sectional area of the orifice 19 by flexure of the body of the fiow control member into engagement with the shoulder 19 and outwardly therealong.

It may further be seen that as the

segmental ribs

26, 26 first engage the shoulder 14, the flow of fluid through the by-pass passageways will be restricted to the space between the

lips

27, 27 and the shoulder 14, resulting in a substantial reduction in the ilow of fluid through the bypass passageways as well as through the central orice 19, and that as the pressure of uid on the upstream face 17 of the flow control member 15 increases further, the

lips

27, 27 will then come into engagement with the shoulder or seat 14, seating against said shoulder and blocking the flow of Huid through the by-pass passageways and then controlling the flow solely by llexing of the body of the flow control member inwardly along the shoulder 14.

It will be o-bserved from this figure that in all positions of deformation of the ilow control member 15, like the flow control member shown in my companion application Serial No. 389,210 previously mentioned, that the orifice 19 is spaced from the inlet side of the reduced diameter outlet passageway 12, and that the flow control member is never deformed into said outlet passageway. The ow control member rather reacts against the shoul- 4 der 14 and spreads outwardly therealong in its periphery vand inwardly therealong along the recessed portion thereof, and at the same time flexes along its central portion to reduce the cross-sectional area at the orifice 19 upon increases in pressure. The flow control member positively blocks the ow of uid through the

bypass passageways

23, 23 above certain predetermined pressures and then controls the flow solely by reduction in cross-sectional area of the central orifice 19 as the pressure in the upstream face ofA said -control member increases, so as to provide a uniform flow throughout the entire pressure range, with a reduced threshold presssure and a resultant free flow of lluid under low pressure conditions.

It will be understood that modifications and variations may be effected in the present invention Without departing from the scope of the novel concepts thereof.

I claim as my invention:

l. A flow control device for maintaining a substantially uniform fluid delivery rate over a wide range of pressure variations comprising a casing having a passa geway leading therethrough, a shoulder in said passageway facing the upstream side thereof, a resilient annular flow control member in said passageway, the inner margins of which define a flow orifice, a by-pass passageway in said ow control member, leading therethrough and opening to the periphery thereof and accommodating the how of fluid along the side of said flow control member under low pressure conditions, said flow control member also having a downstream face spaced from said shoulder inwardly of the periphery thereof, and flexing downwardly into engagement with said shoulder radially inwardly of said by-pass passageway and moving radially inwardly along said shoulder upon increase in pressure on the upstream face thereof, and having sealing engagement with said shoulder to block the flow of uid through said by-pass passageway upon increases in pressure on the upstream face thereof.

2. A huid control device for maintaining a substantially uniform fluid delivery rate over a wide range of pressure variations comprising a casing having a passageway leading therethrough a shoulder in said passageway facing the upstream side thereof, a resilient annular flow control member in said passageway seating against said shoulder, the open portion of which forms a flow orice, said flow control member having a concave face portion on the downstream side thereof with a recess defining the outer margins of said concave face portion and forming-a fluid passageway channel, a central orifice communicating with said concave face portion, and a by-pass passageway opening to the periphery thereof and extending axially thereallong, for by-passing fluid at low pressure through said channel fluid passages, and said ow control member engaging said shoulder inwardly of said channel upon increases in pressure on the upstream face thereof, and having sealing engagement with said shoulder to block the ow of fluid through said by-pass passageway at predetermined high pressure ranges.

3. In a fluid flow control device for maintaining a substantially uniform fluid delivery rate over a wide range of pressure variations comprising a casing having a passageway leading therethrough, a shoulder in said passageway facing the upstream side thereof, a resilient annular ow control member in said passageway, the inner margins of which define a ilow orifice, said flow control member havinga recessed face on the downstream side thereof and having spaced ribs extending along the outer margin thereof and spacing said face from said shoulder and accommodating said recessed face to flex downwardly into engagement with said shoulder upon increases in pressure to restrict the crosssectional area of said central orifice without deforming said ow control member beyond the face of said shoulder, and means affording ow resistance to said ow orifice for low pressure conditions comprising a plurality of by-pass passageways leading through said flow control member and opening to the periphery thereof into said shoulder through said ribs, for accommodating the by-pass of fluid around the periphery of said flow control member at low pressure conditions, and said flow control member flexing into engagement with said shoulder and sealing thereagainst to block the passage of fluid through said by-pass passageways upon predetermined increases in pressure.

4. In a fluid flow control device for maintaining a substantially .uniform delivery rate over a wide range of pressure variations comprising a casing having a passageway leading therethrough, a shoulder in said passageway facingthe upstream side thereof, a resilient annular flow control member in said passageway seating against said shoulder,` the inner margins of said flow control member defining a central fluid flow orifice, said flow control member having a recessed face facing said shoulder and spaced from said shoulder and having a generally frusto-oonical recess extending inwardly within the body of said flow control member into said central flow orifice, and a downwardly opening channel spaced outwardly from said frusto-conical recess, the outer margins of said frusto-conical recess projecting from the downstream face of said flow control member defined by said channel and flexing into Isealing engagement with said shoulder upon increases in pressure thereon, to block the passage of fluid past the sides of said flow control member upon predetermined high pressure conditions, and means affording flow assistance to said central fluid flow orifice comprising a plurality of bypass passageways extending axially along the margin of said annular flow control member into said channel for the free flow of fluid along the sides of said flow control member through said passageway at low pressure conditions.

5. In a fluid control device for maintaining a substantially uniform delivery rate over a wide range of pressure variationscomprising a casing having a passageway leading therethrough, a shoulder in lsaid passageway facing the upstream side thereof, a resilient annular flow control member in said passageway seating against said shoulder, the inner margins of said flow control member defining a central fluid flow orifice, by-pass passageways extending along a periphery of said flow control member and opening to the interior thereof, said flow control member having a recessed portion on the downstream face thereof, in the general form of an annular channel facing said shoulder and having spaced ribs extending from the inner margins of said channel n a downstream direction with a generally frusto-conical recess extending inwardly from said ribs having outer lip portions in the spaces between said ribs and terminating radially inwardly from said ribs and extending in a downstream direction from the portion of said flow control member forming the base of said channel, a lesser distance than said ribs, said channel accommodating the by-pass of fluid through said by-pass passageways at low pressure conditions, said ribs flexing into engagement with said shoulder to restrict the passage of fluid through said by-pass passageways upon increases ln pressure, and said lips positively blocking the flow of fluid through said by-pass passageways upon certain other predetermined increases in pressure and accommodating the control of the flow of fluid solely by restricting the cross-sectional area of said orifice by flexing said flow control member into engagement with and outwardly along said shoulder.

6. In a flow control device for maintaining a substantially uniform delivery rate over a wide range of pressure variations comprising a casing having a passageway leading therethrough, a shoulder in said passageway facing the upstream side thereof, a resilient flow control member in said passageway seating against said shoulder, at least one axial passageway extending along the outer wall of said flow control member and opening t'o the periphery thereof, said flow control member having a recessed central portionl spaced from said shoulder and having communication with said axial passageway,

and flow control lip portions depending from said re` stantially uniform delivery rate over a wide range of pressure .variations comprising a casing having a passageway` leading therethrough, a shoulder in said passageway facing the upstream side thereof, a resilient flow control member in said passageway seating against said shoulder, at least one axial passageway extending along the outer wall of said flow control member and opening to the periphery thereof, said flow control member having a recessed central portion spaced from said shoulder and having communication with said axial passageway, and having spaced ribs spaced inwardly from the outer edge of said flow control member and facing in a down stream direction, and lip portions in the spaces between said ribs and extending toward said seat a lesser distance than said ribs, said ribs flexing into engagement with said shoulder to restrict the passage of fluid through said axial passageway and said lip portions further restricting the flow of fluid through said axial passageway upon certain otherincreases in pressure.

8. In a flow control device for providing a substantially constant ra'te of flow under wide variations in pressure, a casing having a flow passageway therethrough and having an upstream facing seating surface in said passageway, and a resilient flow control member in said passageway, said flow control member having jrst passageway means therethrough ajjording a flow path continuously open in bo-th low and high pressure ranges, said flow control member being deformable under pressure in said high pressure range to vary the flow area of said first passageway means inversely with pressure to provide substantially constant rate of flow therethrough in said high pressure range, said ow control member having second passageway means aording a flow path open in said low pressure range to provide flowv in addition to the flow through said first passageway mlea'ns in said low pressure range to overcome excessive restriction of flow by said flow control member in said low pressure range, said flow control member huving a portion controlling flow through said second passageway means, said flow controlling portion being spaced from said seating surface in said low pressure range and moving under the influence of pressure on said flow control memlber to engage said seating surface in said 1high pressure range and shut-off flow through said second passageway means.

9. In a flow control device for providing a substantially constant rate of flow under wide variations in pressure, a casing having a flow passageway therethrough and having an upstream facing seating surface in said passageway, anda resilient flow control member in said passageway, said flow control member having first passageway means therethrough aording a flow path continuously open in both low and high pressure ranges, the flow area through said rst passageway means being of such a size that in said low pressure ran'ge said flow control member restricts fiow through said first passageway means to a rate smaller than said substantially constant rate of flow, said flow' control member ajording increasing flow with increasing pressure through said first passageway means as the pressure is increased through said low pressure range until said substantially constant rate of flow is reached at the beginning of said high pressure range, said flow control member being deformable under pressure in said high pressure range to vary the flow area of said first passageway lmeans inversely with flow throughf said: jirstA passageway, meansI in. said high pressure range, said flow control member having second passageway/means vfafjora'ingyra;-- lowvv path operiv in said low -pressure range `t provideflowdnraddition to the flow through said first, passageway means in'said low pressure range. to counteract the `restricting of flow' through said rst' passageway means by said flow control member and tendfto bring-totali flowv up to saidsubstantially constant rate in said low pressure range, said flow control member havingaportion controlling iflow through said second passagewayvmeans, said flow controlling portion being spaced from vsaidseating surface in said low' pressure range and movingtoward said seatinggsurface4 under the influence of pressure on said flow controly memberasthe pressure is increased through said low pressure yrange to decreasethe flow area through said -second passageway means as the pressure is.. increased through said low pressure range andprovide decreasing flowvwith increasingE pressure-,through said second passageway means to counteract increasing flow withI increasing pressure through said rst passageway means inA said lowpressure ranges and ltend to maintain saidvsubstantially constant rate-of flow in said low pressure'range, saidflowcontrolling portion moving into enga-gementfwith said seating surface in said high pressure range*` to shut-o1? flow throughr said second passageway 'means 10. A flow' control device for providing @substantially constant rate vof flow underwidevarationsin pressure, comprising a housing having 'a flow passageway' ll'eading therethrough havingA a shoulder therein `facingtin an up stream direction, a resilient flow control disk seated on saidshoulder andfhavingay central orifice leadingttherethroughI deformable upon increases inpressureto provide a .substantially constant: rate of, flow through saidtpas.-

sagewayunder increasing pressure abovea low pressure range, said disk having second passageway means, spaced radiallyY outwardly from said central orice capable of passing fluid, in said low pressure range in addition to thatv passingthrough said central Vorifice to overcome excessive restriction of flow through said flow passageway in said.,.casing` by said disk in said low pressure range, said. flow control member having a portion facing said shoulder and moving toward said shoulder upon increases in pressure for reducing flow through said second pasysagewaymleans as pressure increases' through said low pressure range to provide said substantially constant rate of flow through said housingas pressure increases through said low pressure range and blocking the flow through saidfsecondpassdgeway means in a pressure range above saidA vlow pressure range, solely by the resiliency of said diskland .the pressure of fluid acting thereon.

References Cited in thev le Vof this patent or the original patent UNITED STATES PATENTS 2,460,647 Miller: Feb. l, 1949 2,564,286 Stephany Aug. 14, 1951 2,572,244v Ch'ace Oct.' 23, 1951 2,632,476 Miller Mar. 24, 1953 2,642,896: Cantalupo et a1 June23, 1953 2,667,900 Cantalupo Feb. 2, 1954v