CN1097053A - Connect airtight the elastic sleeve on check valve body - Google Patents

Abstract

Be one-way valve from the container dispenses fluid material, comprise axially extended valve body and be contained on the valve body and and the elastic sleeve of valve body fluid-tight engagement, on the two ends of cover, integrally form O shape ring enlarged, and and the valve body opposite two ends part sealing engagement closely of having dwindled diameter, cover can in all sorts of ways and be assembled on the valve body, comprising the method expanding sheath that uses machinery and be placed on the valve body, is in 2-4 times of scopes of the thickness that overlaps between two enlarged at the thickness size that the enlarged at place, valve body two ends has diametrically.

Description

Connect airtight the elastic sleeve on check valve body

The present invention relates to tightly be bonded on the elastic sleeve on the check valve body.For the face seal with valve body engages, cover is fixed, liquid is directed via passing through valve body with first and second outlet passages that dispose across a certain distance mutually, so that between them, there is not direct runner, pass two passages of valve body, lead to the internal surface of cover respectively in the outer surface upper shed of valve body.When the fluid of supercharging during by valve body, at first the fluid passage of flowing through enters gap between the internal surface of the outer surface of valve body and cover, enters another passage then and flows out valve body.The elastic sleeve expansion allows fluid to flow out valve body, and after the fluid that outwards flows flow to end, the cover resilience engaged with valve body surface, stops fluid reflux.

The valve assembly that is commonly referred to as " Lei Xier valve " in No. 4846810, U. S. Patent comprises: in elastic protective bellows or elastic sleeve by the airtight check valve body in side.Cover closely is bonded on around the valve body, and provides airtight for first outlet passage and second outlet passage that does not directly link to each other.Elastic sleeve is by the O annular, binder or cover is welded on the valve body by method heat or chemistry, thus be sealed on the outer surface of valve body.Needing sealing is will guarantee to enter between the internal surface that the fluid of valve body entrance point points to the outer surface of valve body and elastic sleeve, and the passage of flowing through then is to valve outlet.Will miss if place, the one or both ends of cover is the fluid that distributes so that becomes flexible, impurity will enter the passage in valve, enter the container that holds the fluid that distributes by one-way valve at last.Therefore at one-way valve between the spreadable life or thereafter, providing reliable sealing between the outer surface of valve body and elastic sleeve is the precondition that guarantees can not stain content in the container.

Though " Lei Xier valve " has been proved to be effectively, for remaining on sealing between elastic sleeve and the valve body, use O annular or other method of isolating, increased the cost of cover and O annular and the also complexity of operation of assembling cover on valve body.

So, the method that main purpose of the present invention provides the elastic sleeve of whole combination seal device and assembling is overlapped on check valve body.

Be to realize the seal action of cover and check valve body outer surface, according to the present invention, elastic sleeve is molded as circle tube member, the relative two ends of cover locate or its near have O annular portion or enlarged.In addition, the present invention also is included in the method for assembling elastic sleeve on the check valve body automatically.

In a preferred embodiment, form O shape ring enlarged at the relative place, two ends of elastic sleeve.In one embodiment, be central authorities' symmetries in the two ends place of cover enlarged, from the internal surface of cover to projecting inward and outwards protrude from the outer surface of cover.In another embodiment, enlarged is outwards protruded from the outer surface of cover, simultaneously, and the internal surface of enlarged and the alignment of the internal surface of cover.In the 3rd embodiment, enlarged from the internal surface of cover to projecting inward, and the outer surface of the outer surface of enlarged and cover alignment.Enlarged can be circular on cross section or other shape, and other structure also is possible.

In diameter that the expansion section branch that puts has or radial dimension are 2-4 times of scope at the thickness of cover.For example, be 0.015 inch if overlap thick, so, the diameter of enlarged or radial dimension are in 0.030-0.060 inch scope.

When the size of determining elastic sleeve and further feature, must determine the concrete one-way valve that uses, that is to say, be jet, vaporific or single drop by the kind of valve institute dispensable materials and the characteristic of institute's distributing fluids.As a result, the kind of influence and the elastic sleeve used together of check valve body has five kinds of Fundamentals.A kind of factor is the thickness of cover, other factors is: the ratio of the diameter of the hardness of the material of formation cover, the kind of material, cover and the internal diameter of O shape loop section or enlarged, and the shape in the chamber that forms between the internal surface of outer surface with cover side enclosed hood on every side of cover.By the cover of the airtight cover in side, can perforation or opening.

Because the kind of institute's distributing fluids and the different characteristic of state, influence all influential effect of five kinds of Fundamentals of elastic sleeve during different state.Because economically, though can not consider each factor individually, at least one factor, for example thickness can remain unchanged and can reach different results by the hardness that changes cover material.For example, hardness can be at 15-60(A) scope in, also be possible in the enlarged at the place, two ends of cover or the difformity and the size of circular ring.

The O shape loop section or the enlarged of beginning and integral body are molded together complete.Axially roll extrusion on rest pin of cover, thus roll to the other end by an end, in order to being placed on the valve body.For laying O shape loop section, valve body has the part of having dwindled external diameter at place, its relative two ends.Under situation about rolling, an interior O shape loop section is radially arranged, this part is placed on valve body one end place and has dwindled on the part of diameter.Then, be enclosed within on the valve body and roll, until another O shape loop section is placed in till valve body the other end place dwindled on the part of diameter.Though this assembly operation can be finished by hand, preferably undertaken by shaking control arm or automation assembly mechanical.

On the other hand, in order to aim at valve body in the axial direction, to the side expanding sheath, cover can be assemblied on the arm, though cover is installed on the valve body with the form of expansion at its largest portion of length at least, because compressed air stream, cover radially expands outwardly.Valve body is to inject in the cover, till the part of having dwindled diameter is at one end connected airtight in the O shape loop section at cover one end place.Then, the pin of fixed cover is removed under expansion state, cover radially move inward and fluid-tight engagement around valve body, the O shape loop section at a relative end place of cover peace jail is on the corresponding part of dwindling diameter of valve body.

For the outer surface of the O shape loop section of the opposite two ends that guarantees to overlap and valve body sealing engagement reliably, two-part enclosing cover or outer cover are provided, size that the two-part that separate are selected and check valve body and cover big or small corresponding is placed on the valve body.Up to two covers from each end of opposite end till the one-sided circular ring part of axially compressing of valve body.On the position of assurance two O shapes loop section of cover end and the seal action between the elastic sleeve, adopt usual way, for example, ultrasound, heat, radio frequency or infrared rays welding and chemistry are connected with mechanism, two covers are pressed together, are sealed.

Two covers that assemble guarantee that O shape loop section or enlarged are connected with valve seal, and provide elastic sleeve can radially expand outwardly the cell of permission fluid by valve body therein.It is important avoiding differential pressure to distribute on O shape loop section.

Now, be the thing in the distribution container, the valve body that has been combined, elastic sleeve and lid are prepared to insert the outlet of container end, constitute its part.

Elastic sleeve can be used various materials, and selected material has and the function of the fluid that is assigned with, valve and convection cell use the compatibility of disinfectant method etc.If the use heat sterilization, in the temperature range of whole sterilization and in the sterilization needed time, selected material must keep its integrity so, and sterilization can be finished with other method, for example, by illumination penetrate, electron beam and ethylene oxide or the like.

Replace independent elastic sleeve and make overlapping the device that is sealed on the valve outer surface, seal arrangement is to form with the integral part that overlaps in the present invention.Cover is axially extended, has the seal arrangement that forms on the relative two ends of a determining deviation in the axial direction.Seal arrangement is a form of taking O shape loop section or enlarged.Enlarged put can be placed in the middle in case they outwards protrude from the outer surface of cover and the inner surface radial direction ground of cover with radially to projecting inward.In another embodiment, enlarged is outwards protruded from the outside of cover, and the alignment of the internal surface of the internal surface of enlarged and cover.In yet another embodiment, enlarged from the internal surface of cover to projecting inward, and and the outer surface alignment of cover.Enlarged can be used various regular or irregular shapes.In addition, the combination of other of these embodiments also is possible.

The new various features that constitute feature of the present invention have the part of concrete description and the disclosed technology contents of formation the application in claims.Be the advantage of understanding the present invention's operation better and the specific purposes that reach by use, need consult the following drawings and describe preferred each embodiment of the present invention in detail.

Fig. 1 is the axially extended sectional view of the valve assembly of explanation prior art.

Fig. 2 is the view that is similar to Fig. 1, yet it is presented at the elastic sleeve of the present invention on the valve body appropriate location.

Fig. 3 is the view according to an embodiment's of elastic sleeve of the present invention section axial extension.

Fig. 4 is the view that is similar to Fig. 3, shows another embodiment of elastic sleeve.

Fig. 5 is the view that is similar to Fig. 3 and Fig. 4, shows another embodiment of elastic sleeve of the present invention.

The different step of elastic sleeve preparatory work is placed in Fig. 6 A-6D explanation on valve body.

Fig. 7 A-7B is presented at another kind of step of placing elastic sleeve on the valve body.

Fig. 8 is perpendicular to the sectional view of the axis of cover, shows another kind of vacuum assembling method.

Fig. 9 assembles on valve body, just in time the view of the section axial extension of the cover before compressing and being enclosed in the supporting lid.

Figure 10 is the axially extended sectional view that shows the device among the Fig. 9 that assembles fully,

The valve assembly 12 that discloses in No. 4846810, the U. S. Patent in Fig. 1 comprises: axially extended valve body 14 between entry end 16 and outlet end 18.When valve body was put into the distribution container opening, entry end 16 thing maintenances direct and in the container were communicated with.

First outlet passage 20 stretches out a part as the axial length of valve body 14 from entry end 16.A relative end of first outlet passage 20 is branched off into some independently first ducts 22 and separately extends to the outer surface 14a of valve body 14 with certain spacing isogonism ground always from entry end 16.Outlet end 18 towards valve body spaced apart be second duct 24, it extends internally separately and from outer surface 14a with certain spacing isogonism ground and is connected on the inner end of second outlet passage 26.Second outlet passage 26 and first outlet passage 20 are axially aimed at, and two passages valve body axially on isolate certain spacing mutually.

Under normal circumstances, around outer surface 14a and and its tight joint be elastic sleeve 28.To contiguous outlet end 18, elastic sleeve spreads on the outer surface 14a of valve body 14 from neighboring entry end 16.Valve body axially on the place, two ends that separates at a certain distance, cover 18 is sealed on the outer surface 14a of valve body.When cover 28 when being placed on the valve body, it trails, so that its fluid-tight engagement is around valve body, for the outer surface that runs through valve body 14 and be that the opening in first and second ducts 22,24 forms airtight.

Cover 28 tightens and is enclosed on the outer surface 14a of valve body 14 at the O shape ring element on the recess part on the valve outer surface 32 30 by pacifying the jail.By the employed special seal arrangement in the relative two ends of cover can according to the feature of use type of material and institute's distributing fluids change.Except O shape ring element 30, cover can also by heat or chemical adhesive operation or use tackiness agent to seal.

If valve assembly 12 is installed on the container that can be extruded or compress, the thing in the container will flow out by valve assembly 12 so, at first enter valve body 14 through first outlet passage 20.When fluid first outlet passage 20 of flowing through, promptly enter first duct 22, and flow to the outer surface 14a of valve body substantially radially outwardly.Act on the hydrodynamic pressure on elastic sleeve 28 internal surfaces, it is expanded outwardly, so that fluid is at the outer surface 14a of valve body 14 and overlap between 28 the internal surface 28a and flow, one in arriving second duct 24 so that radially inwardly flow, fluid enters the inner end of second outlet passage 26 from second duct 24, and flows out valve assembly by outlet end 18.When not having fluid flow path valve assembly 12, elastic sleeve 28 is to form airtight in first and second ducts 22,24 at the outer surface 14a place of valve body 14.As a result, after fluid distributed, impurity can not reflux by valve assembly and enter container.When fluid expansion elastic sleeve 28, mobile fluid will stop that impurity enters container.When the fluid that distributes flows to second duct 24, elastic sleeve 28 will be tightened up or resilience and block duct on the outer surface 14a of valve body 14, enter container so that prevent to reflux by second outlet passage 26.

For being reduced at valve assembly shown in Figure 1 12, reduce the number of part, the cost of reduction elastic sleeve and simplification are enclosed within the assembling on the valve body, the invention provides the valve assembly 112 that shows in Fig. 2.Valve assembly 112 comprises that the axle with entry end 116 and outlet end 118 takes out the valve body 114 of extension.Entry end 116 is placed in the distribution container, and (not shown) directly is connected with the fluid that distributes.At first, first outlet passage 120 stretches out from entry end 116 in the axial direction, and then, passing hole channel 122 is to the outer surface 114a of valve body 114.Outer surface 114a contacts with the internal surface 128a of elastic sleeve 128.Are second ducts 124 in valve body 114 outer surface 114a upper sheds at a distance of certain spacing towards outlet end 118 directions from first duct 122.Second outlet passage 126 is led in second duct 124, so that pass through the outlet end distributing fluids of valve assembly 112.

Elastic sleeve 128 can be that the elastic material that rubber or thermoplastic material or heat are closed is with fixed attention made, and is equipped with O shape ring enlarged 130 at its place, two ends, and simultaneously, these enlarged are clamped in the end that has dwindled diameter 132 of two opposite ends of valve body 114.

In use, the entry end 116 of valve body 114 is put the outlet of distribution container into, so that pass through the effect of compression container or metering pump, as above face is described among Fig. 1 and passes through the valve assembly distributing fluids by valve assembly 12 same methods.

In Fig. 3, elastic sleeve 128 in Fig. 2 is described with the mode form.Elastic sleeve 128 has axially extended cylindrical shape part 140 and has inner radial surface 140a and radially-outer surface 140b on it.140 relative places, two ends all are O shape ring enlarged 130 in the cylindrical shape part.Two enlarged on the two ends of cylindrical shape part are to aim at central authorities, two enlarged from the outer surface 140b of cylindrical shape part 140 outwards protrude and from the internal surface 140a of cylindrical shape part 140 to projecting inward.Cylindrical shape part 140 about thick 0.010-0.025 inches.The diameter T of enlarged 130 is in the 2-4 times of scope of the wall thickness t of cylindrical shape part 140.Therefore, the diameter T of enlarged is in 0.020-0.100 inch scope.In addition, because the structure placed in the middle of enlarged 130, the internal diameter of molded enlarged has diameter d, and the internal surface of cylindrical shape part 140 has than major diameter D ₁

Another embodiment who in Fig. 4, shows elastic sleeve 228, its enlarged 230 have with the internal surface of the internal surface 240a alignment of cylindrical shape part 240 and from outer surface 240b radially to the outer surface that protrudes.

The 3rd embodiment who in Fig. 5, shows elastic sleeve 328, it has internal surface 340a from the cylindrical shape part to projecting inward enlarged 330, and the outer surface 340b alignment of the outer surface of enlarged and cylindrical shape part.

These different structures of elastic sleeve 128,228,328 depend on the shape that the airtight supporting of valve body and valve assembly is covered, and requisite airtight effect is provided.As mentioned above, the elastic sleeve the 128,228, the 328th that in Fig. 3,4 and 5, shows, molded and shaped state.The inside diameter D of cylindrical shape part ₁Outer diameter D than valve body ₂Less, when being placed on the valve body with box lunch, cover by expansion and closely be bonded on valve outer surface around, to guarantee duct 122,124 reliably airtight in first and second outlet passages 120,126.

In assembly operation, as shown in Figure 6A, elastic sleeve 128 is molded and shaped and be supported on the centrepin 150.Though the method with hand assembled is possible.But owing to reasons such as cost, efficient and precision, the step of assembling is the (not shown) of being undertaken by remote control arm or automated machine.

Beginning, shown in Fig. 6 A and 6B, in the time of still on molded centrepin, cover 128 forms the winding part of annular, as Fig. 6 B shown in from rolling on one's body.In Fig. 6 c, annular winding part therefrom core pin is taken off.Under this situation, the internal diameter of annular portion is equivalent to overlap the diameter of the internal surface 140a of 128 cylindrical shape part 140.This inside diameter D ₁The diameter of end 132 of diameter that approximated dwindling of valve body 122 greatly, as shown in Figure 2.

On valve body 114 during with the annular portion of automation mechanized operation ssembly drawing 6C and 6D, the radially outer enlarged 130 of rolled-up part is placed in the part of having dwindled diameter 132 at valve body 114 1 end places, simultaneously, elastic sleeve 128 is from one end to the other side launched, shown in enlarged 130(Fig. 6 D intracardiac in the annular portion of rolling) peace jail (not shown) till on the part of having dwindled diameter 132 at place, valve body opposite end.The internal diameter of enlarged 130 can be made the diameter less than the part 132 of having dwindled diameter, so that form the active force of chucking.Yet this is not for guaranteeing the precondition of the sealing between enlarged 130 and valve body, because can use other method, this will narrate below.

Can resemble method ssembly drawing 4 identical shown in Fig. 6 A-6D and the embodiment among Fig. 5.

In Fig. 7 A and 8B, show the method that is enclosed within the another kind of automation assembling on the valve body.In this embodiment, elastic sleeve 128 is molded and shaped states, rolls unlike previous embodiment, and shown in Fig. 7 A, pin 160 injects an end of cover and continuity one segment distance on the axial length of cover.

In Fig. 7 B, show the molded state of cover and show the expansion state of cover that from the position that Fig. 7 A shows, by outside moving pin radially, the cover 128 that is installed on the pin 160 is subjected to dilating effect with dotted line with solid line.As a result, an end of cover 128 becomes expansion state.And the molded form of the other end when keeping it to begin.If necessary, pressurized air can blow in the cover, is convenient to expansion.Shown in Fig. 7 B, along with the expansion of cover, valve body 114 injects in the cover, up to the enlarged 130 peace jails of not expansion dwindling of valve body on the part 132 of diameter.Then, extract pin and make enlarged 130 peaces of expansion firm on the part of having dwindled diameter 132 at place, valve body opposite end, finish the assembling that is enclosed within on the valve body.

In Fig. 8, show another kind of package assembly.The external surface peripheral that is arranged on cover that shows with cross section be four vacuum components 170.The assembly process (not shown) of elastic sleeve 128 on valve body is at each vacuum component 170 place, and vacuum puts on and puts.Vacuum component radially outwards moves, and arrives till the position that is represented by dotted lines up to cover.In the cover, vacuum was ended in vacuum component, moves inward so that overlap 128 when valve body was inserted, and became and valve body 114 fluid-tight engagement, and simultaneously, O shape ring enlarged 130 peaces on the cover two ends have gone into to dwindle on the part 132 of diameter, shown in Fig. 6 D.

Can easily understand,, can use another kind of automation assembly operation on valve body, placing elastic sleeve.

The outer surface 114a fluid-tight engagement of elastic sleeve 128 that in Fig. 2, shows and valve body 114.For guaranteeing the sealing contact between the end that has dwindled diameter 132 of enlarged 130 and valve body 114, can cover or cover the valve body and being provided with on every side of elastic sleeve of combination, as Fig. 9 and shown in Figure 10.

If a complete lid is put on the valve body in the elastic combination part, so, at least at one end be with and be subjected to displacement and lose the trend of sealing contact.

As shown in Figure 9, in the present invention, lid 180 is made by two cover pieces 182, and two cover pieces are placed on the assembly parts of valve body 114 and elastic sleeve 128 from each end of opposite end, when end wall 184 touches enlarged 130, between two central authorities' ends 186 of lid 180 a gap h is arranged.

In order to become complete lid 180, by power F two cover pieces 182 are forced together, hold 186 to be in contact with one another and to suppress together up to two central authorities of cover piece 182, in order to become complete lid 180, cover piece 182 can be welded together at two central authorities end 186 places, perhaps can use other connecting means.

When two cover pieces 182,182 were pressed together, end walls 184,184 was pressed to contiguous enlarged 130, had guaranteed dwindling of enlarged and valve body the sealing contact between the end 132 of diameter.

Can be contrastively referring to Fig. 3-5 and Fig. 9, the inside diameter D of the cover of shaping ₁Outer diameter D less than valve body ₂, the result, elastic sleeve 128 fluid-tight engagement are around the outer surface 114a of valve body.In addition, inwardly and between the outer surface 140b of the cylindrical shape part 140 of cover leave certain space from covering 180 inner surface radial direction ground.When fluid divides timing by valve body, it forces cover radially outside, forms runner between first outlet passage 120 and second outlet passage 126.Lead at cover 128 outer surface 140b and the gap 188 covered between 180 the internal surface exhaust port can be set by covering 180, when the fluid that distributes fully by behind the valve body, guarantee the cover bounce-back so that and the outer surface of valve body closely engage again.

Though the elastic sleeve 128,228,328 shown in Fig. 3-5 has the basic circular enlarged 130,230,330 that is, but these enlarged can form different shape Else Rule or irregular, this depends on the operational condition of valve assembly, the shape of valve body 114 and lid 180 and the material that forms elastic sleeve.

Though shown and each specific embodiment of the present invention has been described in detail in detail, so that explanation the application of the principles of the present invention situation, obvious, the present invention can have other embodiment, and does not deviate from principle of the present invention.

Claims (20)

1, for to stop that in one-way valve the elastic sleeve of backflow comprises: have inner radial surface, radially-outer surface and at axial direction at a distance of first end of certain intervals and the axially extended cylindrical jacket of second end; The first and second end adjacency, integrally formed O shape loop section with described cover, described being enclosed within has thickness (t) on its direction radially between described O shape loop section, described O shape loop section has thickness (T) in the radial direction at it, and it is in the 2-4 times of scope of the thickness that overlaps between O shape loop section.

2, elastic sleeve according to claim 1 is characterized in that: described cover is made by elastic material, and when power put on cover inboard, it can radially expand outwardly, and when power disappeared, it can radially inwardly rebound.

3, elastic sleeve according to claim 1 is characterized in that: described O shape loop section is integrally formed with described cylindrical jacket.

4, elastic sleeve according to claim 1, it is characterized in that: described O shape loop section is to put enlarged placed in the middle described, described enlarged has the radially-outer surface that certain distance is radially outwards arranged from the radially-outer surface of described cylindrical jacket, and the inner radial surface that certain distance is radially inwardly arranged from the inner radial surface of described cylindrical jacket.

5, elastic sleeve according to claim 1, it is characterized in that: described O shape partly is the enlarged of described cylindrical jacket, and it has inner radial surface of aliging with the inner radial surface of described cylindrical jacket and the radially-outer surface of radially outwards giving prominence to from the radially-outer surface of described cylindrical jacket.

6, elastic sleeve according to claim 1, it is characterized in that: described O shape loop section is an enlarged, and it has with the inner radial surface of the radially-outer surface of described cylindrical jacket alignment and from the radially inwardly outstanding inner radial surface of the inner radial surface of described cylindrical jacket.

7, elastic sleeve according to claim 1 is characterized in that: described cover is made by thermoplastic elastomer (s).

8, elastic sleeve according to claim 1 is characterized in that: described cover coagulates elastic material by heat and makes.

9, elastic sleeve according to claim 1 is characterized in that: described its radial cross section of O shape loop section is rounded.

10, elastic sleeve according to claim 1 is characterized in that: at least a portion of the outer surface of described O shape loop section is non-circular.

11, be one-way valve from the container dispenses fluid material, comprise: have for receiving the entry end of flowing material and be the valve body of the outlet end of dispenses fluid material outside valve body from container, described valve body has the outer surface of extending circumferentially between the entry end of described valve body and outlet end; At least one entry end from described valve body extends to first outlet passage of the outer surface of described valve body; At least one extends to second outlet passage of described valve outlet end from described valve outer surface; On the outer surface of valve body, dispose described first and second outlet passages with certain spacing; One elastic sleeve fluid-tight engagement is around the outer surface of described valve body, and form airtight for described first and second outlet passages on the outer surface, described cover has inner radial surface, radially-outer surface, near first end of described entry end configuration and second end that disposes near described outlet end, and and first and second contiguous ends of described cover integrally form, and form the device of fluid-tight with described valve body.

12, one-way valve according to claim 11 is characterized in that: described device comprises the ring of the O shape on the relative two ends of described cover enlarged respectively.

13, one-way valve according to claim 12, it is characterized in that: described enlarged has inner radial surface and radially-outer surface, to projecting inward, the radially-outer surface of described enlarged radially outwards protrudes from the radially-outer surface of described cover the inner radial surface of described enlarged from the inner radial surface of described cover.

14, one-way valve according to claim 12, it is characterized in that: described O shape ring enlarged has inner radial surface and radially-outer surface, the inner radial surface of described enlarged is alignd with the inner radial surface of described cover, and the radially-outer surface of described enlarged radially outwards protrudes from the radially-outer surface of described cover.

15, one-way valve according to claim 12, it is characterized in that: described O shape ring enlarged has inner radial surface and radially-outer surface, the inner radial surface of described enlarged is alignd with the inner radial surface of described cover, and the radially-outer surface of described enlarged radially outwards protrudes from the radially-outer surface of described cover.

16, one-way valve according to claim 11 is characterized in that: described enlarged thickness diametrically is in the 2-4 times of scope of thickness of the cover that makes progress of the footpath between two enlarged.

17, one-way valve according to claim 16 is characterized in that: described enlarged has some outer surfaces that extend in non-circular mode at least.

18, one-way valve according to claim 16 is characterized in that: described enlarged radially inwardly reaches among described cover radially outward two directions direction from described cover at least and protrudes.

19, one-way valve according to claim 12, it is characterized in that: described valve body have the axially extended middle body that connects by described cover with from the inside recessed a pair of relative end of described middle body, and have a diameter more less than described middle body, two the above ends form the shoulder of ring-type at the place, two opposite ends of described middle body, described enlarged is placed in described shoulder, and contacts with described shoulder sealing.

20, one-way valve and around the described cover that extends between the enlarged at cover opposite end place sealing cover is set, described lid leans against on the described enlarged, and oppresses described enlarged and form sealing with described valve body and contact.

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