CN101611251B - Centreline flow valve - Google Patents

Abstract

A valve (10) is disclosed. The valve (10) has an inclined valve seat (14) defining a fluid aperture (18), and a valve head (20) for contact with the valve seat (14) for closure of the fluid aperture (18). A lever arm (22) is attached to the valve head (20). There are biasing means (32) operatively coupled to the lever (22) arm for urging the valve head (20) into contact with the valve seat (14), the biasing means (32) being arranged to provide decreased biasing on opening of the valve head (20) relative to the fluid aperture (18).

Description

Central line's flow valve

Technical field

The present invention relates generally to a kind of valve, and not exclusively be particularly related to irrevocable valve (non-returnvalve), one-way valve (check valve) or anti-Check valve (backflow prevention valve).

Background technique

The one-way valve of duckbilled structure is known comparatively speaking and is used in the valve field.There are many patent documentations to disclose duckbill valve, comprise U.S. Patent number 3,901,272,4,524,805,3,822,720,4,240,630 and 6,089,260.These patents have disclosed the valve of duckbill form similarly, have the slit in its outlet port.This slit is designed to when its periphery applies, flexibly be out of shape and open at tension force, and because its shape makes slit automatically close through the deviated stress in the valve.

The Patent No 996,588 and the D.B.P. No 4,033,818 of prior art described the change example of the duckbilled one-way valve of existing technology.U. S. Patent 996,588 all is the valve with conical shaped shape with D.B.P. 4,033,818, is designed to only allow flowing along a direction.U. S. Patent 996,588th has the transverse slot of the thicker relatively top section that passes valve, and this slit is tensioned under hydrodynamic pressure flexibly to be out of shape and to open.D.B.P. 4,033,818th, a kind of pressure relief valve has the discharge orifice at its top, and open and release pressure under predetermined pressure in this hole.D.B.P. 4,033,818 valve are with high elasticity synthetic resin or rubber manufacturing, and its biased closing is still opened under pressure around discharge orifice.

International Patent Application PCT/AU00/00659 of claimant's (and former) has disclosed a kind of irrevocable valve, has conical valve diaphragm.The valve diaphragm is used the resiliency flexible material manufacturing, comprises the axle collar hole that exposes, so that under the hydrodynamic pressure of valve upstream side, open.The valve diaphragm is tensioned or meets with stresses around in axle collar hole, and the wall thickness of diaphragm reduces towards its top, to help opening of valve.

These one-way valves or irrevocable valve have following at least problem:

It is (i) very high in order to realize that it opens the needed differential pressure that strides across valve,

(ii) valve can be designed to reduce this differential pressure in order to open but be opened with relatively low differential pressure easily subsequently and reveal and

(iii) the valve under its open mode can not have very big mobile throughput because slit or

(throat restriction) is relatively very high for the throat restriction of axle collar opening.

International Patent Application PCT/AU2005/0O1762 of claimant is the example that attempt addresses these problems.

Summary of the invention

According to the present invention a kind of valve is provided, comprises:

Valve body, the inclination valve seat with the fluid bore of defining;

Valve head is used to finish valve seat, to close fluid bore;

Lever arm is attached to valve head; With

Biased member is operably connected to lever arm, is used to impel valve head to contact with valve seat, and said biased member is arranged as the bias voltage with ground is provided when valve head is opened with respect to fluid bore.

Preferably, biased member comprises spring assembly.More preferably, this device of spring comprises extension spring.More preferably, extension spring extends, and the one of which end is attached to lever arm and a relative end is attached to valve body.

Preferably, extension spring is by pre-stretching, so that minimum differential fluid pressure to be provided when valve head is opened.More preferably, spring is with respect to lever arm construction, so that the absolute speed that springs changes reduces when increasing the valve head opening degree.More preferably, when valve was opened, the imaginary acute angle between spring longitudinal axis and lever arm longitudinal axis reduced.

Preferably, lever arm roughly is elongated and between its opposite end, is installed on the pivot.More preferably, valve head is attached at or closes on an end of lever arm, and spring is attached at or closes on the other end of lever arm.More preferably, valve head is positioned at a side of pivot, and spring attached is the opposite side at pivot.

Preferably, valve seat and valve chest integrally form.More preferably, valve seat is with respect to the cross section of the valve body angle tilt with 5 ° to 80 °.More preferably, valve head its close and open position between angular shift less than about 75 °.

Preferably, the cross section of fluid bore is avette or elongates shape, is used to increase the flow velocity through this valve.More preferably, valve head comprises the periphery edge part, and this part forms roughly avette or elongates shape.

Preferably, valve also comprises elastomer seal, is assemblied near the periphery edge part, is used for sealing contact valve seat.More preferably, elastomer seal is the form of lip shape Sealing, is configured to flexibly be out of shape, with promotion sealing to valve head when valve head is closed.

Preferably, valve head defines the into entering fluid passage on the fluid bore upstream side, and said passage has inwall, this inner wall limit to the taper importing portion of this fluid bore.More preferably, inwall closes on and surrounds the pivot of lever arm.More preferably, the inner wall limit on the fluid bore downstream side cavity, lever arm is contained in this cavity at least in part when valve head is opened.

Usually, a kind of valve is provided, like what aforementioned arbitrary claim limited, it is the safety check with normally closed structure.

Any description that this paper does valve should be understood and comprises:

A kind of unit, like check unit, it can be used in combination independently or with a plurality of unit, reduces the valve in zone or the valve of other types to form unidirectional, two unidirectional, two unidirectional, pressure; With

Valve comprises one or more unit, reduces the valve in zone like one, two, two unidirectional valve or pressure.

Description of drawings

In order to realize better understanding to characteristics of the present invention, with reference to accompanying drawing, the preferred embodiment of valve is only described through the mode of example, wherein:

Fig. 1 (a), 1 (b), 1 (c) have shown the various views according to an embodiment of the valve that is in open mode of the present invention;

Fig. 2 has shown the end elevation according to another embodiment of the valve that is in open mode of the present invention;

Fig. 3 has shown the cross-sectional side view of valve embodiment illustrated in fig. 2;

Fig. 4 has shown that valve embodiment illustrated in fig. 2 is in the cross-sectional side view of closed condition;

Fig. 5 is the ideograph of relative power-open angle of the valve of Fig. 1;

Fig. 6 is that Fig. 2 is to the measuring spring power of the valve of 4 illustrated embodiments and the figure of acute angle-open angle;

Fig. 7 is that Fig. 2 is to the spring elongation of the valve of 4 illustrated embodiments and the figure of acute angle-open angle;

Fig. 8 is the end elevation of replacement valve of the present invention;

Fig. 9 and 10 is respectively the longitdinal cross-section diagram of valve of two Fig. 1 of the state of closing and opening, and this valve in series moving pipeline of longshore current is installed;

Figure 11 is the replacement installation form of the valve that in series takes up;

Figure 12 measures when zero L/min begins to increase at flow velocity for the valve and the commercial figure that can obtain the pressure decline-flow velocity of valve of Fig. 1;

Figure 13 is the figure of the pressure decline-flow velocity on two adjacent valve (two check configuration) of Fig. 1; Use throttle valve and commercial obtainable variable speed pump flow speed control to measure; And also can obtain valve to commerce and measure, measurement is carried out when zero L/min begins to increase at flow velocity;

Figure 14 is the figure of the pressure decline-flow velocity on two adjacent valve of Fig. 1, measures when zero L/min begins to increase at flow velocity, and when flow velocity descends, measures once more; With

Figure 15 is the ideograph of the replacement of relative power-open angle.

Embodiment

Fig. 1 (a) has shown the various views according to an embodiment of valve 10 of the present invention to 1 (c).Valve 10 normally is used to be installed in the water valve of family expenses or Treatment of Industrial Water flowline.In this was used, water valve 10 was meeting under the legal design standard and should under up to the differential pressure about 7.0kPa, still keep shut.Although this embodiment's water valve 10 specifically is designed to satisfy other design demand of this or various prescribed by standard, it should be understood that valve can have other application, include but not limited to industry and family expenses one-way valve and at the irrevocable valve of pipeline industry.

Water valve 10 comprises valve body 12, and this valve body comprises the valve seat 14 that is arranged in valve body 12.These valve body 12 shapes are roughly cylindrical shape, have at one end exit opening 16 and at the inlet opening 18 of opposite end.In this embodiment, valve seat 14 integrally forms with valve body 12, and it is preferably with thermoplasticity or polymer material injection-molded, as with high density polyethylene (HDPE) such as HDPE, and polypropylene, polycarbonate (PC) or nylon.Valve seat 14 defines the fluid bore 15 in valve body 12.Should be understood that Fig. 1 (a) is the end elevation from the outlet 16 of valve 10, and Fig. 1 (b) is the end elevation from relative entry end 18.Fig. 1 (c) is that water valve 10 is partly opened from the perspective view of the water valve 10 of outlet end 16.

Water valve 10 also comprises movable valve head 20, and this valve head is arranged in valve body 12 pivotally.Valve head 20 is connected to an end of lever arm 22, and this lever arm is installed to valve body 12 (shown in dotted line among Fig. 1 (c)) at the place, opposite end around pivot axis 24).Valve head 20 comprises that resilient seal 30 is installed to this edge around the revers turn part of its periphery edge 28 (rebate) 26.Resilient seal 30 contacts with valve seat 14, is used to let valve 10 seal closures.In a preferred embodiment, resilient seal is closed ring, has the shape of valve head 20 peripheries when it is in unstress state on being positioned over planar surface naturally, and it can not be circular and triangle that for example can be ellipse, distortion or lachrymal.

Fig. 2 to 4 has shown another embodiment according to valve 400 of the present invention with various views.Be similar to that the parts of corresponding part have identical reference character in the previous embodiment.In order to strengthen sealing, resilient seal 30 as shown in Figure 3 comprises outstanding lip 31, like what in International Patent Application PCT/AU2007/000263 of claimant, disclose.Patent application that this is formerly submitted to and claimant's priority application: i) Australian provisional application 2006901049; Ii) U.S. Provisional Application 60/816, and 885--is herein incorporated together by reference.And valve seat 14 is " square " preferably, thus Sealing 30 contact planar surface rather than angled surfaces.In certain embodiments, resilient seal 30 is exchanged with valve seat 14, and promptly Sealing is assemblied on the valve seat.Sealing can be such as compression or the such simple seal part of O shape lopps Sealing.

This embodiment's water valve 400 comprises the biased member of extension spring 32 forms.Extension spring 32 be elongated and respectively near the opposite end the opposite end of outlet end 16 and lever 22 place be connected to valve body 12.

Spring 32 is with respect to pivotal axis 24 configuration and be connected to lever arm 22, opens the required power of valve 400 with control.This can simplify through the plotted curve of Fig. 6, and--to be breaking force--reduce (line among Fig. 6 and 7 only is schematic) to power gradually that wherein open the required streamwise 20 of valve 400 along with opening of valve.This minimizing that should be understood that breaking force be through reduce extension spring 32 when valve head 20 is opened bias effect realize.For example, opening when general (about 40 °) basically at valve head, to open valve head 20 required power only be to open 50% of the required power of valve head (20 °) at first.This design is provided at low differential pressure and closes effectively, for example up to about 7.0kPa, and to most of angular movements of valve head 20 the very little resistance of opening is provided.Needing maintaining valve to open (70 °) required power fully is to open the very little mark of the required power of valve at first.

Valve head 20 is remained on the required power of open position come balance through the moment of torsion that is applied to lever 22 by spring 32.This moment of torsion depends on:

1. what the stretching of spring 32 caused is applied to the power of lever arm 22 along axle of spring 33; With

This power and lever arm 22 ends the inswept tangent component of circular arc.

The 2nd relevant with the sine of imaginary acute angle 37, as shown in Figure 4, and this angle forms between the longitudinal axis 35 of the longitudinal axis 33 of spring and lever arm 22.This angle 37 is in maximum and along with valve 400 is opened and descended when valve cuts out, as shown in Figure 6.As shown in Figure 6, when valve 400 was opened fully, angle 37 was near zero and the 2nd minimum, and maintaining valve 400 opens required power fully and cuts out required power less than maintaining valve thus.Data point shown in Fig. 6 and 7 has the correlated error between 10% and 20%.

As shown in Figure 3, valve head 20 is with respect to longitudinal axis 35 skews of lever arm 22.This allows valve 400 not have at valve head 20 to open fully under the situation of contact spring, and this will be opened with the degree of limited flow by limiting valve 40.The valve head that does not have skew also can increase the acute angle 37 that valve 400 is opened fully.Because the power of opening near zero hold valve 400 along with angle 37 is near zero, so it is very favourable for example to let valve 400 open fully through the valve head skew.

Because of along with the elongation through increasing spring 32 of the moment of torsion of opening the reduction that acute angle 37 reduces to cause of valve 400 and tension force by partly counteracting.In this embodiment, valve seat 14 defines a plane, this plane with respect to valve 400 laterally or the angle tilt of sectional plane.That is, valve seat 14 acutangulates earth tilt with the central longitudinal axis with respect to valve 400.In this case, and as shown in Figure 4:

When valve is opened fully the bar 53 of attached spring inswept angle reduce; With

2. the initial elongation speed of spring reduces, and reduces final spring thus and elongates.

Fig. 7 has shown that spring elongation rate was maximum when the angle between valve head and valve cross section was very little.The preferred embodiment--valve head 26 of wherein closing tilts 20 °--has been avoided the bending area (omission) from 0 ° to 20 °.When valve 400 was opened fully, this had reduced final spring elongation, and reduces breaking force thus.The diagram of Fig. 7 has shown that also by valve head 26 and bar 53 inswept angles be maximum 50 °, and then when valve 400 is opened fully, reduces spring and elongate, and reduce breaking force thus.

The spring that use has the little spring constant also is favourable, because the increase spring force change rate of following spring to elongate in this case reduces.Also have, let spring 32 be attached to situation that lever arm 22 and spring 32 be attached to lever arm 22 away from pivot 24 and compare and cause littler spring to elongate near pivot 24.

The opening characteristic of valve 10 can be revised through following factor, comprises;

1. change the physical Design of valve, for example, customize the angle of valve seat again,

2. the biasing force of " adjustment " spring 32 or other bias mechanisms;

Towards or away from the joint of pivot 24 mobile springs 32 so that reduce or increase the effect of lever arm respectively,

With respect to one or two mounting points of pivotal axis 24 mobile springs with reduce or increase the power that is applied to valve head 20 and

5. move pivot 24 with respect to spring 32, in the whole stroke of valve head 20, to adjust the effective force that is applied to this valve head 20 similarly.

Fig. 8 is the end elevation of the alternative embodiment of valve.In order to realize all intentions and purpose, except the shape of valve seat 140 and valve head 200, this replacement water valve 100 is identical with previous embodiment.For with reference to easily, we have designed the corresponding part of this valve 100, for example use extra " 0 " to be used for valve body it is labeled as 120.The valve seat 140 of this example normally circular and shape and valve head 200 complementations.Can find out that with the contrast of Fig. 8 the valve 100 of this replacement is compared with aforementioned valve 10 has bigger throat restriction from Fig. 1 (b), and have the amount of passing through (throughput capacity) of reduction comparatively speaking probably.

Fig. 9 and 10 has shown the valve of Fig. 1, and it is installed in series in the mobile housing 34 of flowline 36 (two unidirectional layout).Fig. 8 has shown the valve 10,11 that is in closed condition, and Figure 10,11 has shown the valve of opening 10.For fear of repetition, we have designed and have been used for any parts of valve 10,11.Housing 34 has endoporus, and this endoporus allows the press fit of valve 10, and this valve 10 is adjacent to each other and coaxial line ground is aimed at.Comprise the shaft shoulder 40 and inside hole tapering that is used for upstream valve 10 in the hole 38 at upstream extremity place, to aim at upstream flow pipeline 36.Comprise annular recess 42 in each of the valve 10,11 at upstream extremity place, this recess holds and is used for the O-ring seals 44 of valve body 12 with housing 34 sealings.Housing 34 is included in the threaded opening 45 of the increasing of housing 34 downstream end.Valve 10,11 openings via this increasing " are packed into " in hole 38. Valve 10,11 is fixed in the housing 34 via screw fit part 46 subsequently, and this screw fit part 46 is attached to the downstream of housing 34.

Fig. 9 and 10 also clearly show that the valve body 12 with inwall 48, and this valve body takes up the major part of lever arm 22, pivot 24 and spring 32.Inwall 48 on the upstream side of valve 10 defines the taper importing portion 50 of fluid bore 15.Inwall 48 limits cavity 52 on its downstream side, lever arm 22 is contained on the opening of valve head 20 at least in part in this cavity.

Shown in Fig. 1 and 8, lever arm 22 is actually in a pair of spaced lever arm that is connected to valve head 20 rear sides and has shared pivot 24.Arm 22 interconnects at this place, opposite end via bar 53.Bar 53 provides the mounting points that is used for extension spring 32, and this spring is between this pair of lever arms 22.

As shown in Figure 9, each comprises load-carrying unit 54 lever arm 22, and this element is outstanding from their last bow shaped surface.Load-carrying unit 54 defines pivot axis 24 together.In this embodiment, load-carrying unit 54 engages in the opening and closing process of valve head 20 and carries recess 56.Carry recess 56 and for example be included in each of 58 such a pair of vertical walls that separate, said vertical wall is positioned at inwall 48 belows and is attached thereto.

Can find out also that from Fig. 9 and 10 valve seat 14 defines with respect to the cross section of valve 10 plane inclined at a certain angle.In this embodiment, valve seat 14 and valve head 20 under its closed condition with about 15 ° angle tilt.The inclination of valve seat 14 means that with the shape of inwall 48 fluid bore 15 is roughly shape avette or lengthening.On the other hand, the fluid bore 150 of the alternative embodiment of Fig. 8 is shaped as circular, tilts with respect to the cross section of valve 100 effectively at this place's valve seat 140.The shape of valve head 20 also makes when valve is opened it roughly meet with the interior shape of valve body, and being shaped as of valve seat or fluid bore provides fully being located in of valve head when valve cuts out.For example, the shape of valve head can be the saddle form.

Figure 11 is the sectional view of the alternate means of family expenses or industrial water processing equipment.The housing 340 of this example is different slightly with aforementioned applications, but the inclination of two valves is practically identical.Therefore, for fear of repetition, we use the reference character identical with previous embodiment to represent the corresponding part of this application.

Figure 12 is the figure of pressure decline-flow velocity among the embodiment of valve shown in Figure 1.Pressure descends and approximately changes to 10kPa from 5kPa, and flow velocity is less than about 65L/min.For relatively, shown the commercial similar results that obtains valve.Pressure descends and approximately changes to 40kPa from 15kPa, and flow velocity is less than 65L/min.In this scope, the pressure that the pressure suppression ratio commerce of the valve of Fig. 1 can obtain valve descends little about 25%, and has many times the standard pressure less than the 50kPa at the 48L/min place descend.Under 20L/min, 40L/min and 60L/min flow velocity, 25%, 50% and 100% of inswept its angular range of lever 22 difference.

Figure 13 be with Figure 12 in the similar figure of measurement result, but what be directed against is shown in Figure 9 to be in two of two unidirectional layouts in abutting connection with valve.Measure and carry out twice.To given flow velocity, carry out first group of measurement with throttle valve, and use the pump of variable velocity to carry out second group of measurement.For relatively, use the pump of variable velocity that the obtainable valve of commerce is measured to given flow velocity.The lever arm 22 of upstream valve 10 is respectively under the flow velocity of 30L/min, 45L/min and 55L/min 50%, 100% and 100% of inswept its angular range.The lever arm 22 of downstream valve 11 is respectively under the flow velocity of 30L/min, 45L/min and 55L/min 50%, 75% and 100% of inswept its angular range.

Figure 14 is two figure in abutting connection with the pressure decline-flow velocity of valve of Fig. 1 under two check configuration, and the two is all measured when flow velocity increases and reduce subsequently.Observe retardation phenomenon; , measures flow velocity the minimum pressure loss when descending.Retardation phenomenon can be controlled through changing manufacturing tolerances and non-linear spring device.

Figure 15 is the figure of the breaking force-valve head angle of another embodiment of the present invention.In this case, although the power that it should be noted that increases at first, it is subsequently from about 15% the reduction of opening, and when opening fully this force rate to open the required power of valve 11 at first little by 70%.

Although described a plurality of preferred embodiments in detail, it will be understood by those skilled in the art that valve has at least one following advantage:

1. valve can be designed to keep shut and avoid being leaked to minimum differential pressure thus, when it is opened, arrives 10kPa less than 5 usually;

2. valve can be made and produced to move with consistent performance, for example moves at predetermined lowest difference pressure;

3. valve provides high relatively backflow resistance (back flow resistance);

4. valve and valve head can be designed to provide big relatively passing through aperture and big flow is provided thus;

5. the decline of the hydrodynamic pressure on the valve significantly is lower than the valve (that is, having improved flow coefficient C v or flow factor Kv) of existing technology, and the result is:

(i) supply pressure reduces, allow to use littler and more effective supply pump or in extensively having adopted building of the present invention and zone water tower height above sea level can reduce, or

The valve that (ii) can use valve than existing technology to have material still less but have identical or the similar pressure loss.This has superiority economically.

It will be understood by those skilled in the art that the present invention described herein compares and can change and revise with specifically described embodiment.For example, valve can be cast or molded and can have the structure that meets with metal or plastics, and wherein the parts as Sealing can be that elastomer and other parts are plastics or technology.It is the embodiment of described extension spring that valve needn't be restricted to, but can extend to other springs or the biased member that can when valve is opened, provide biasing force to reduce.Valve head need not to be said or shown in the plane.For example, valve head can be the form of three-dimensional bending and can be the form of ligule or saddle.All such changes and modifications can be thought to fall in the scope of the present invention, and its characteristics are confirmed by above stated specification.

Should understand the disclosure of any prior art in this manual and should not think to admit that this known prior art forms the part of Australia or other local common practise.

Claims (18)

1. valve comprises:

Valve body, the inclination valve seat with the fluid bore of defining, wherein valve seat is with respect to the cross section of the valve body angle tilt with 5 ° to 80 °;

Valve head is used to contact valve seat, to close fluid bore;

A pair of spaced lever arm, each all is attached to valve head said lever arm, and each all has the longitudinal axis that departs from from valve head; With

Biased member; Be operably connected to lever arm; Be used to impel valve head to contact with valve seat, said biased member is arranged as the bias voltage that reduction is provided when valve head is opened with respect to fluid bore, and wherein biased member comprises extension spring; And wherein when valve was opened, the imaginary acute angle between spring longitudinal axis and the lever arm longitudinal axis reduced.

2. valve as claimed in claim 1, wherein, extension spring is elongated, the one of which end is attached to lever arm and a relative end is attached to valve body.

3. valve as claimed in claim 1, wherein, extension spring is by pre-stretching, so that minimum differential fluid pressure to be provided when valve head is opened.

4. want 1 described valve like right, wherein, spring is with respect to lever arm construction, so that the absolute change rate of springs reduces when the valve head opening degree increases.

5. valve as claimed in claim 1, wherein, lever arm is elongated and two lever arms are installed on the pivot between its their opposite end.

6. valve as claimed in claim 5, wherein, valve head is attached at an end of lever arm, and spring is attached at the other end of lever arm.

7. valve as claimed in claim 6, wherein, valve head is positioned at a side of pivot, and spring is attached at the opposite side of pivot.

8. valve as claimed in claim 1, wherein, valve seat and valve chest integrally form.

9. valve as claimed in claim 1, wherein, valve seat is with respect to the cross section of the valve body angle tilt with 5 ° to 20 °.

10. valve as claimed in claim 1, wherein, valve head its close and open position between angular shift less than about 75 °.

11. valve as claimed in claim 1, wherein, the cross section of fluid bore is avette or elongated shape, is used to increase the flow rate of fluid through this valve.

12. valve as claimed in claim 11, wherein, valve head comprises the periphery edge part, and this part forms roughly avette or elongated shape.

13. valve as claimed in claim 12, wherein, valve head also comprises elastomer seal, is assemblied near the periphery edge part, is used for contacting hermetically valve seat.

14. valve as claimed in claim 13, wherein, elastomer seal is the form of lip shape Sealing, is configured to flexibly be out of shape, with promotion sealing to valve head when valve head is closed.

15. valve as claimed in claim 1, wherein, valve body defines the entering fluid passage on the fluid bore upstream side, and said passage has inwall, this inner wall limit to the taper importing portion of this fluid bore.

16. valve as claimed in claim 1, wherein, the inwall of valve body on the fluid bore downstream side closes on and surrounds the pivot of lever arm.

17. valve as claimed in claim 1, wherein, the valve interior wall on the fluid bore downstream side limits cavity, and lever arm is contained in this cavity at least in part when valve head is opened.

18. valve as claimed in claim 1, it is irrevocable valve or the one-way valve with normally closed structure.

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