JP2014105774A - Three-way valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive three-way valve with a simple structure.SOLUTION: A three-way valve 1 includes a housing 2 having a cylindrical inner space 10 having an inflow port 20 and two outflow ports 21 and 22, and a rubber valve element 3 having a cylindrical part 25 closely housed in the cylindrical inner space 10. The cylindrical part 25 can be reciprocated between a first position and a second position slid to an axial direction S of the cylindrical part 25 from the first position in the inner space 10. A first communication groove 31 for communicating the inflow port 20 with the one outflow port 21 at the first position and a second communication groove 32 for communicating the inflow port 20 with the other outflow port 22 at the second position are formed on a peripheral surface of the cylindrical part 25.

Description

  The present invention relates to a three-way valve.

  Conventionally, as a three-way valve for medical equipment, those described in Patent Documents 1 and 2 are known. For example, the flow path formed in the housing is switched by moving the valve body back and forth within the housing.

Japanese Patent No. 2889358 Japanese Patent No. 2590379

However, in any of the three-way valves of Patent Documents 1 and 2, the number of parts is increased for sealing between members and between flow paths, and the structure is complicated. As a result, the manufacturing cost was expensive.
The present invention has been made in view of such a conventional technique, and is to provide an inexpensive three-way valve with a simple structure.

  The invention according to claim 1 has a housing including a cylindrical inner space having one inflow port and two outflow ports, and a columnar portion that is closely accommodated in the cylindrical inner space, The cylindrical portion is capable of reciprocating between a first position and a second position slid in the axial direction of the cylindrical portion from the first position in the inner space, and the circumference of the cylindrical portion is The surface has a first communication groove for communicating the inlet and one of the two outlets at the first position, and the second position at the second position. A three-way valve comprising: a rubber valve body formed with a second communication groove for communicating the inlet and the other outlet of the two outlets. is there.

According to a second aspect of the present invention, the cylindrical inner space has a circular inner peripheral surface and a disk-shaped inner end surface provided so as to close one end side in the axial direction of the inner peripheral surface. The three-way valve according to claim 1, characterized in that it is a feature.
According to a third aspect of the present invention, the first position is a position where one end surface of the columnar portion is in close contact with the inner end surface of the inner space, and the second position is one where the one end surface of the columnar portion is the The three-way valve according to claim 2, wherein the three-way valve is located at a predetermined distance from the inner end face of the inner space.

According to a fourth aspect of the present invention, the first communication groove includes a groove extending in a circumferential direction along a circumferential surface of the columnar portion, and the second communication groove is formed on a circumferential surface of the columnar portion. The three-way valve according to claim 3, comprising a groove extending along the axial direction.
The invention according to claim 5 is characterized in that the first communication groove and the second communication groove are connected in an intersecting direction at a predetermined position on a peripheral surface of the cylindrical portion. 4 is a three-way valve.

The invention described in claim 6 is characterized in that the first communication groove and the second communication groove do not have a connected portion on the peripheral surface of the cylindrical portion. This is a three-way valve.
The invention according to claim 7 is characterized in that the first communication groove and the second communication groove are grooves having a semicircular or rectangular cross section. The three-way valve according to one item.

  The invention according to claim 8 is characterized in that the inlet is formed so that the inlet faces the inner space at a predetermined position on the inner peripheral surface, and one of the two outlets is formed on the inner peripheral surface. An outlet is formed so as to face the inner peripheral surface at a predetermined position on the inner peripheral surface that is approximately 180 ° away from the inlet of the inflow port, and the other of the two outflow ports is formed at a predetermined position on the inner end surface. The three-way valve according to claim 2, wherein an outlet faces the inner space.

The invention according to claim 9 is characterized in that the rubber valve element includes a shaft integrated with a valve element protruding from the center of the end surface opposite to the one end surface. It is the three-way valve as described in any one.
The invention according to claim 10 is the three-way valve according to any one of claims 1 to 9, wherein the rubber valve element is formed of any one of EPDM, FKM, and FFKM. It is.

The invention according to claim 11 is the three-way valve according to claim 10, characterized in that at least a peripheral surface of the cylindrical portion of the rubber valve body is subjected to a surface treatment for reducing friction. .
The invention according to claim 12 is characterized in that the fluid flowing in from the inlet and flowing out of either of the two outlets is a medical drug solution. It is a three-way valve described in.

  According to the first aspect of the present invention, the cylindrical portion of the rubber valve body is reciprocated between the first position and the second position in a state of being housed in the inner space of the housing. The communication relationship between the space inlet and the two outlets can be switched. Since the valve body itself for sealing between the inlet and the two outlets in the inner space and switching the flow path between them is provided with a communication groove that connects the inlet and the two outlets, A three-way valve having a structure can be realized, and as a result, the manufacturing cost of the three-way valve can be reduced.

According to the second aspect of the invention, the inner space can be cup-shaped and sealed with a simple structure.
According to invention of Claim 3, when a valve body exists in a 1st position, it can seal between the one end surface of the cylindrical part of a valve body, and the inner end surface of a housing.
According to the invention of claim 4, since the first communication groove extends in the circumferential direction and the second communication groove extends in the axial direction, for example, one of the outlets can be disposed on the inner peripheral surface of the inner space, The other outlet can be arranged on the inner end face of the inner space.

According to the fifth aspect of the present invention, since the first communication groove and the second communication groove communicate with each other, the inflow port and both communication grooves can communicate with each other. As a result, for example, it is possible to gradually close one outlet while gradually opening the other outlet.
According to the sixth aspect of the present invention, since the first communication groove and the second communication groove are formed independently of each other, they can be sealed with a simple structure.

According to invention of Claim 7, if it is the 1st communicating groove and 2nd communicating groove of a semicircle or a rectangular cross section, it can form easily.
According to invention of Claim 8, the structure of a housing can be simplified by arrange | positioning an inflow port and two outflow ports in the predetermined position mentioned above.
According to the ninth aspect of the present invention, for example, a rubber valve element can be driven via a shaft by a solenoid.

According to the invention described in claim 10, since the chemical resistance of the valve body can be enhanced if it is made of EPDM, FKM, or FFKM, a three-way valve that can be used for medical purposes can be provided.
According to the invention of claim 11, by applying a surface treatment with low friction to the valve body, for example, even in a state where the valve body and the housing are in close contact with each other in order to improve the sealing performance, The rubber valve element can be smoothly reciprocated in the housing. In other words, high sealing performance and reliable operation can be realized with a simple structure.

  According to invention of Claim 12, it can utilize as a three-way valve of medical equipment.

FIG. 1 is a partial sectional view of a three-way valve 1 according to an embodiment of the present invention, and shows a state in which a valve body 3 is in a first position. FIG. 2 is a partial cross-sectional view of the three-way valve 1 and shows a state where the valve body 3 is in the second position. FIG. 3 is a four-side view of the valve body 3. FIG. 4 is a perspective view of a valve body 3A as a first modification. FIG. 5 is a perspective view of a valve body 3B as a second modification. FIG. 6 is a perspective view of a valve body 3C as a third modification. FIG. 7 is a perspective view of a valve body 3D as a fourth modified example. FIG. 8 is a partial cross-sectional view of the three-way valve 1D, and shows a state where the valve body 3D is in the first position. FIG. 9 is a partial cross-sectional view of the three-way valve 1D and shows the valve body 3D in the second position.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a partial cross-sectional view of a three-way valve 1 according to an embodiment of the present invention, and shows a state in which a valve body 3 is in a first position. FIG. 2 is a partial cross-sectional view of the three-way valve 1 and shows a state where the valve body 3 is in the second position. FIG. 3 is a four-side view of the valve body 3.
Referring to FIG. 1, a three-way valve 1 has a substantially cylindrical housing 2 and a valve body 3 for switching the flow of fluid in the housing 2. The valve body 3 has a cylindrical shape, is slidable in the housing 2 in the axial direction S, and reciprocates between the first position shown in FIG. 1 and the second position shown in FIG. A shaft 4 for reciprocating the valve body 3 is provided at the end of the valve body 3. A solenoid 5 as a drive source is connected to the shaft 4.

The three-way valve 1 and the solenoid 5 constitute an electromagnetic valve 6. The flow path in the housing 1 can be switched by energizing the solenoid 5 or stopping the energization. The three-way valve 1 is used, for example, in a medical device such as a medical examination apparatus to control the flow rate of a fluid such as a medical drug solution or to switch the flow path of the fluid.
The housing 2 is made of, for example, a hard material such as synthetic resin or metal. In the housing 2, a bottomed cylindrical inner space 10 whose one end is closed is formed. In addition, an inflow path 15, a first outflow path 16, and a second outflow path 17 are formed as flow paths connected to the inner space 10.

The inner space 10 has a circular inner peripheral surface 11 and a disk-shaped inner end surface 12 provided so as to close one end side in the axial direction S of the inner peripheral surface 11. A diameter expansion chamber 13 is provided at the open end of the inner space 10. The inner diameter of the expansion chamber 13 is larger than the inner diameter of the inner space 10.
The inflow passage 15 can circulate fluid from the outside to the inner space 10. The inflow path 15 opens an inflow port 20 as an end portion thereof at a predetermined position on the inner peripheral surface 11 of the inner space 10.

  The first outflow passage 16 can circulate the fluid from the inner space 10 to the outside. The first outflow passage 16 has a first outlet 21 as an end on the inner space 10 side. The first outlet 21 is opened so as to face the inner space 10 at a predetermined position on the inner peripheral surface 11 on the side separated from the inlet 20 by approximately 180 °. The first outlet 21 is arranged at a position different from the inlet 20 in the axial direction S, for example, closer to the inner end face 12 than the inlet 20.

  The second outflow path 17 is provided independently of the first outflow path 16 and can circulate fluid from the inner space 10 to the outside. The second outflow passage 17 has a second outlet 22 as an end on the inner space 10 side. The second outlet 22 is opened so as to face the inner space 10 at a predetermined position of the inner end surface 12, for example, at the center of the inner end surface. As the aforementioned predetermined position, when viewed in the axial direction S, the second outflow port 22 and the end of a second communication groove 32 to be described later of the valve body 3 do not overlap even partly. I just need it.

The valve body 3 has a columnar portion 25 and a disc-shaped flange portion 26. The columnar portion 25 and the flange portion 26 are integrally formed of a rubber material.
The cylindrical portion 25 is housed in the inner space 10 of the housing 2 so that the peripheral surfaces thereof are in close contact with each other, and the space between the peripheral surfaces is sealed.
The flange portion 26 is provided at an end portion in the axial direction S of the columnar portion 25 on the side opposite to the one end surface 27. The flange portion 26 is housed in the enlarged diameter chamber 13 of the housing 2 so that the peripheral surfaces thereof are in close contact with each other, and the peripheral surface between the flange portion 26 and the enlarged diameter chamber 13 is sealed.

Referring to FIG. 3, a first communication groove 31 and a second communication groove 32 are formed on the peripheral surface of the cylindrical portion 25 of the valve body 3.
The first communication groove 31 includes a groove extending in the circumferential direction along the circumferential surface of the cylindrical portion 25. The first communication groove 31 has a semicircular cross section when cut in the direction in which the groove extends, but may be rectangular as described later.

  Specifically, the first communication groove 31 continuously extends endlessly in the circumferential direction, and has an elliptical shape surrounding the columnar portion 25. The elliptical shape is a line of intersection between the cylindrical peripheral surface of the columnar portion 25 and a plane that obliquely intersects the axis of the columnar portion 25. The first communication groove 31 extends along the circumferential direction at a portion farthest from the end surface 27 with respect to the axial direction S and at a portion closest to the end surface 27 with respect to the axial direction S, and between the two portions. Extends obliquely with respect to the circumferential direction.

  The second communication groove 32 is configured by a groove that extends straight in the axial direction S along the peripheral surface of the cylindrical portion 25, and extends from the one end surface 27 with a predetermined length in the axial direction S. The second communication groove 32 is open at one end surface 27, and is connected to the first communication groove 31 in the crossing direction at the end opposite to the one end surface 27 in the axial direction S, and communicates with each other. ing. The second communication groove 32 has a semicircular cross section when cut in the direction in which the groove extends, but may be rectangular as described later.

The operation of the electromagnetic valve 6 will be described with reference to FIG. The three-way valve 1 is driven by a solenoid 5. The solenoid 5 includes a coil 35, a movable core (movable iron core) 36 that can move to a position inside the coil 35 when energized, and an urging member that returns the movable core 36 to a position protruding from the coil 35 when de-energized. As a spring 37.
When the coil 35 is not energized, the movable core 36 is disposed at a position protruding from the coil 35. At this time, the valve body 3 of the three-way valve 1 is in the first position. In the first position, the one end surface 27 of the cylindrical portion 25 is in close contact with the inner end surface 12 of the inner space 10 and seals the space therebetween. Further, the end face of the flange portion 26 and the end face of the diameter expansion chamber 13 are in close contact with each other to seal the gap therebetween.

  At this time, the inflow port 20 and the end portion of the first communication groove 31 opposed to the inflow port 20 are opposed to each other so as to communicate with each other. Moreover, the 1st outflow port 21 and the edge part of the 1st communicating groove 31 which opposes this oppose each other so that communication is possible. As described above, the first communication groove 31 allows the inflow port 20 and the first outflow port 21 to communicate with each other. The fluid flows from the inflow path 15 through the first communication groove 31 to the first outflow path 16.

  On the other hand, in the first position, the inlet 20 and the end of the second communication groove 31 facing the inlet 20 are separated from each other in the axial direction S. Further, the inner end surface 12 of the housing 2 and the one end surface 27 of the valve body 3 are in close contact with each other, and the space between them is sealed. The second outlet 22 is closed by one end face 27 of the valve body 3, and the end of the second communication groove 32 on the one end face 27 side is closed by the inner end face 12 of the housing 2. Therefore, in the first position, the fluid also flows from the inlet 20 into the second communication groove 32 via the first communication groove 31, but the second communication groove 32 communicates with the second outflow path 17. The fluid does not pass through and does not flow to the second outflow passage 17.

  With reference to FIG. 2, by energizing the coil 35, the movable core 36 can be slid to a position inside the coil 35. Thereby, the valve body 3 of the three-way valve 1 is displaced to the second position. At the second position, the one end surface 27 of the cylindrical portion 25 is separated from the inner end surface 12 of the inner space 10 by a predetermined distance. Further, the end face of the flange portion 26 and the end face of the diameter expansion chamber 13 are separated by a predetermined distance.

At this time, the inflow port 20 and the end portion of the second communication groove 32 facing the inlet 20 are opposed to each other so as to be able to communicate with each other. Further, the second communication groove 32 and the second outlet 22 can communicate with each other through between the inner end surface 12 of the housing 2 and the one end surface 27 of the valve body 3. The fluid flows from the inflow path 15 through the second communication groove 32 to the second outflow path 17.
On the other hand, in the second position, the inlet 20 and the corresponding end of the first communication groove 31 are separated from each other in the axial direction S. The first outlet 31 and the corresponding end of the first communication groove 31 are separated from each other by a predetermined distance in the axial direction S. This predetermined distance is preferably a distance that is at least half of the maximum dimension of the first outlet 21 in the axial direction S. Thereby, the 1st outflow port 31 and the 1st communicating groove 31 cannot mutually communicate. Therefore, in the second position, the fluid also flows into the first communication groove 31 from the inflow port 20 via the second communication groove 32, but does not flow to the first outflow path 16.

  As described above, the cylindrical portion 25 of the rubber valve body 3 is reciprocated between the first position and the second position while being housed in the inner space 10 of the housing 2. The communication relationship between the ten inlets 20 and the two outlets 21 and 22 can be switched. The inlet 20 and the two outlets 21 and 22 are provided in the valve body 3 itself for sealing between the inlet 20 and the two outlets 21 and 22 in the inner space 10 and switching the flow path therebetween. Since the connecting grooves 31 and 32 to be connected are provided, the three-way valve 1 having a simple structure can be realized, and as a result, the manufacturing cost of the three-way valve 1 can be reduced.

Further, since the first communication groove 31 and the second communication groove 32 are formed on the outer peripheral surface of the rubber valve body 3, these grooves can be easily formed, and the structure of the housing 2 can be simplified.
Moreover, it can seal with a simple structure by forming the inner space 10 in cup shape.
Further, when the valve body 3 is in the first position, the one end surface 27 of the columnar portion 25 of the valve body 3 and the inner end surface 12 of the housing 2 can be in close contact with each other, thereby sealing the gap.

Further, by extending the first communication groove 31 in the circumferential direction and the second communication groove 32 in the axial direction S, for example, one outlet 21 can be disposed on the inner peripheral surface 11 of the inner space 10, and the other Can be disposed on the inner end face 12 of the inner space 10.
Further, since the first communication groove 31 and the second communication groove 32 are connected to each other, the fluid flowing from the inflow port 20 flows into both the first communication groove 31 and the second communication groove 32. be able to. Therefore, for example, when moving the valve body 3 from the first position to the second position, the first outlet 21 is gradually closed while the second outlet 22 is gradually opened while the first outlet 21 is gradually closed. The fluid can be circulated through both the 21 and the second outlet 22.

  In addition, since the first communication groove 31 and the second communication groove 32 are grooves having a semicircular cross-sectional shape, the first communication groove 31 and the second communication groove 32 can be easily formed. In particular, since the first communication groove 31 and the second communication groove 32 having a semicircular cross section are on the peripheral surface of the cylindrical portion 25, the valve body 3 with the communication grooves 31, 32 is forcibly molded. Is possible. Therefore, the mold structure can be simplified and the manufacturing cost can be reduced.

For example, when the first communication groove 31 has a semicircular cross section with a radius of curvature R1 equal to or less than one fifth of the diameter D1 of the cylindrical portion 25 of the valve body 3, the rubber valve body 3 is forcibly removed. The manufacturing cost can be reduced ((5 * R1) ≦ (D1), see FIG. 3A)). The same applies to the second communication groove 32.
Further, the structure of the housing 2 is simplified by arranging the inflow port 20 and the first outflow port 21 at positions opposite to each other on the inner peripheral surface 11 and arranging the second outflow port 22 on the inner end surface 12. Can be

Further, by providing the rubber valve body 3 integrally with the metal shaft 4, for example, the rubber valve body 3 can be driven by the solenoid 5 via the shaft 4.
The shaft 4 is made of a hard material such as metal. A portion of the shaft 4 having a predetermined length protrudes along the axial direction S from the center of the end surface opposite to the one end surface 27 of the valve body 3, and the remaining portion of the shaft 4 is embedded in the valve body 3. Yes.

In order to integrate the shaft 4 and the valve body 3, for example, when the valve body 3 is formed of rubber with a mold, an adhesive is applied to a portion where the shaft 4 is embedded, and the shaft 4 is embedded. With the portion inserted into the mold, rubber is vulcanized into the mold to mold the valve body 3. Thereby, the rubber valve body 3 and the shaft 4 can be bonded.
The rubber valve body 3 is formed of any one of EPDM (ethylene propylene diene rubber), FKM (vinylidene fluoride-based fluororubber), and FFKM (tetrafluoroethylene-purple fluorovinyl ether-based fluororubber). preferable. In this case, since the chemical resistance of the valve body 3 can be improved, the three-way valve 1 that can be used for medical purposes can be provided. As for chemical resistance, FKM is stronger than EPDM, and FFKM is stronger than FKM.

If the chemical resistance of the valve body 3 is not a problem, a general rubber material such as natural rubber or NBR (nitrile butadiene rubber) may be used for the valve body 3.
At least the peripheral surface of the cylindrical portion 25 of the rubber valve body 3 is subjected to a surface treatment for reducing friction. For example, chlorination or surface treatment is performed. Thereby, the frictional resistance at the time of the sliding movement of the valve body 3 can be reduced. As a result, the rubber valve element 3 can be smoothly reciprocated in the housing 2 even when the valve element 3 and the housing 2 are in close contact with each other in order to improve the sealing performance. In other words, high sealing performance and reliable operation can be realized with a simple structure.

Moreover, the following modifications can be considered about this embodiment. In the following description, the points different from the above-described embodiment will be mainly described. In addition, about another structure, it is the same as that of the above-mentioned embodiment.
For example, instead of the valve body 3, the valve body 3A shown in FIG. 4, the valve body 3B shown in FIG. 5, and the valve body 3C shown in FIG. 6 may be used. Instead of the valve body 3, the valve body 3D and the housing 2D shown in FIGS. 7 to 9 may be used.

FIG. 4 is a perspective view of a valve body 3A as a first modification. FIG. 5 is a perspective view of a valve body 3B as a second modification. FIG. 6 is a perspective view of a valve body 3C as a third modification.
As shown in FIG. 4, the first communication groove 31 </ b> A and the second communication groove 32 </ b> A may not have a connected portion on the peripheral surface of the columnar portion 25 of the valve body 3 </ b> A. In this case, the first communication groove 31A and the second communication groove 32A can be sealed together with a simple structure.

As shown in FIG. 5, the first communication groove 31 </ b> B may be a groove having a predetermined length (for example, a length corresponding to a half circumference) in the circumferential direction of the valve body 3 </ b> B. .
Further, as shown in FIG. 5, the end portions of the first communication groove 31B and the second communication groove 32B may be formed in a rectangular shape.
Moreover, as shown in FIG. 6, the first communication groove 31C may include a through-hole that obliquely penetrates the valve body 3C.

Moreover, as shown in FIG. 6, the second communication groove 32C may be a groove having a rectangular cross-sectional shape. Thereby, the 2nd communicating groove 32C can be formed easily.
In addition, you may apply the characteristic of each valve body 3,3A, 3B, 3C mentioned above to another valve body. In addition, the characteristics of the first and second communication grooves described above can be applied to the first and second communication grooves of other embodiments and modifications. Moreover, you may apply to the valve body and communication groove which are mentioned later.

FIG. 7 is a perspective view of a valve body 3D as a fourth modified example. FIG. 8 is a partial cross-sectional view of the three-way valve 1D, and shows a state where the valve body 3D is in the first position. FIG. 9 is a partial cross-sectional view of the three-way valve 1D and shows the valve body 3D in the second position.
Referring to FIG. 7, the valve body 3D includes a first communication groove 31D and a second communication groove 32D. Both the first communication groove 31D and the second communication groove 32D extend in an endless annular shape in the circumferential direction, and have an elliptical shape on the circumferential surface. The plane including the ellipse along which the first communication groove 31 </ b> D extends and the plane including the ellipse along which the second communication groove 32 </ b> D extends are inclined in opposite directions with respect to the axial direction S of the valve body 3. Further, a housing 2D is used corresponding to the valve body 3D. The inner peripheral surface 11 of the housing 2D is open on both sides in the axial direction S, and has a first outlet 21 and a second outlet 22 at different positions in the axial direction S.

Referring to FIG. 8, when in the first position, inflow port 20 and first communication groove 31D face each other so as to communicate with each other, and first outflow port 21 and first communication groove 31D can communicate with each other. Opposite to. On the other hand, the inflow port 20 and the second communication groove 32D are separated in the axial direction S so as not to communicate, and the second outflow port 22 and the second communication groove 32D are separated in the axial direction so as not to communicate.
Referring to FIG. 9, when in the second position, inflow port 20 and second communication groove 32D face each other so that they can communicate with each other, and second outflow port 22 and second communication groove 32D can communicate with each other. Opposite to. On the other hand, the inflow port 20 and the second communication groove 31D are separated in the axial direction S so as not to communicate, and the first outflow port 21 and the first communication groove 31D are separated in the axial direction so as not to communicate.

Further, it is conceivable to eliminate the shaft 4 and the flange portion 26 in each valve body. Further, a direct-acting drive source other than a solenoid may be used for driving the three-way valve.
In addition, various design changes can be made within the scope of matters described in the claims.

1, 1D Three-way valve 2, 2D Housing 3, 3A, 3B, 3C, 3D Valve body 4 Shaft 10 Inner space 11 Inner peripheral surface 12 Inner end surface 20 Inlet 21 First outlet (one outlet)
22 Second outlet (the other outlet)
25 cylindrical portion 27 one end face 31, 31A, 31B, 31C, 31D first communication groove 32, 32A, 32B, 32C, 32D second communication groove S axial direction

Claims (12)

A housing having a cylindrical inner space having one inlet and two outlets;
It has a cylindrical portion that is closely stored in the cylindrical inner space,
The columnar portion is reciprocally movable in the inner space to a first position and a second position slid from the first position in the axial direction of the columnar portion,
A first communication groove for communicating the inlet and one of the two outlets at the first position on the peripheral surface of the cylindrical portion, and the second A rubber valve body formed with a second communication groove for communicating the inlet and the other outlet of the two outlets when in position;
A three-way valve characterized by containing.   2. The cylindrical inner space has a circular inner peripheral surface and a disk-shaped inner end surface provided so as to close one end side in the axial direction of the inner peripheral surface. Three-way valve.   The first position is a position where one end surface of the columnar portion is in close contact with the inner end surface of the inner space, and the second position is a predetermined distance between the one end surface of the columnar portion and the inner end surface of the inner space. The three-way valve according to claim 2, wherein the three-way valve is at a distant position. The first communication groove includes a groove extending in the circumferential direction along the circumferential surface of the cylindrical portion,
The three-way valve according to claim 3, wherein the second communication groove includes a groove extending in the axial direction along the peripheral surface of the cylindrical portion.   5. The three-way valve according to claim 4, wherein the first communication groove and the second communication groove are connected in an intersecting direction at a predetermined position on a peripheral surface of the columnar portion.   5. The three-way valve according to claim 4, wherein the first communication groove and the second communication groove do not have a connected portion on a peripheral surface of the cylindrical portion.   The three-way valve according to any one of claims 1 to 6, wherein the first communication groove and the second communication groove are grooves having a semicircular or rectangular cross-sectional shape. The inlet is formed so that the inlet faces the inner space at a predetermined position on the inner peripheral surface,
One of the two outlets is formed so that the outlet faces the inner peripheral surface at a predetermined position on the inner peripheral surface on the side of the inner peripheral surface that is approximately 180 ° away from the inlet of the inlet.
3. The three-way valve according to claim 2, wherein the other of the two outlets is formed so that the outlet faces the inner space at a predetermined position on the inner end surface.   The said rubber valve body is equipped with the shaft integrated with the valve body which protrudes from the end surface center on the opposite side to the said one end surface, The three-way as described in any one of Claims 1-8 characterized by the above-mentioned. valve.   The three-way valve according to any one of claims 1 to 9, wherein the rubber valve body is formed of any one of EPDM, FKM, and FFKM.   The three-way valve according to claim 10, wherein at least a peripheral surface of the cylindrical portion of the rubber valve body is subjected to a surface treatment for reducing friction.   The three-way valve according to any one of claims 1 to 11, wherein the fluid that flows in from the inflow port and flows out of one of the two outflow ports is a medical drug solution.

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