JP3028211B2 - valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to valves.

[0002]

2. Description of the Related Art In a valve in which a communication passage provided in a valve or a valve portion is disconnected from an inlet passage or an outlet passage provided in a valve body by rotation of the valve portion, a semiconductor, a liquid crystal or the like is used. The material used in the manufacture of the resin is made of fluororesin from the viewpoint of cleanliness.

Conventionally, this type of fluorine resin valve has been
The valve portion, the valve stem, the valve body, and the like are separately manufactured by machining and then assembled, and the sealing of the sliding portion is achieved by interposing a sealing member in the sliding portion.

[0004]

However, if individual parts are manufactured through machining or a sealing member is used to ensure the sealing property, the number of assembly steps is increased, and an extra sealing member is required. In addition to problems, there were many problems in terms of assembly workability and cost.

The present invention has been made in view of the above circumstances, and has as its object to provide a valve which requires a small number of parts and is excellent in productivity and economy.

[0006]

According to a first aspect of the invention, there is provided a valve having a truncated cone-shaped valve portion provided with a communication passage, the diameter of which is smaller than the diameter of the larger diameter end. Valve stems of different diameters
A shaft portion having a diameter not larger than the diameter of the small-diameter end portion at the small-diameter side end portion holds a rotating member coaxially protruding, and the rotatable member is rotatably held around its axis, and A valve body formed of a synthetic resin integrally molded body having an inlet passage and an outlet passage that are cut off from the communication passage by rotation of the valve portion, forming the rotating member.
Of the valve body above the molding shrinkage of the synthetic resin
The molding shrinkage of the synthetic resin forming the seal is large, and the entire outer peripheral surface of the valve portion is a sealing surface, and the entire sealing surface is provided with a sealing seat surface formed on the inner surface of the valve body. The valve body is rotatably supported by the valve body in such a manner that the valve body is slidably overlapped with the valve body and the valve body is filled with a stepped portion formed by the large-diameter end of the valve portion and the valve stem. A first bearing portion, and a second bearing portion which fills a recess formed by the small-diameter end of the valve portion and the shaft portion and penetrates the shaft portion to rotatably support the shaft portion. It is.

[0007] In the valve according to the present invention, since the valve body is formed of an integrally molded synthetic resin, the valve body is formed of one part. In addition, since the seal seat surface formed on the inner surface of the valve body and the seal surface formed by the entire outer peripheral surface of the valve portion are slidably overlapped with each other, the seal member described at the beginning is used. Despite the absence, the sealing performance of the sliding part is ensured.
Furthermore, the valve according to the present invention includes a first valve body.
The bearing portion and the second bearing portion prevent the displacement of the valve portion in the axial direction.

The synthetic tree forming the rotating member
The above-mentioned valve body is formed more than the molding shrinkage of fat.
Because the molding shrinkage of synthetic resin is large,
Shrinkage of the formed synthetic resin after molding causes the valve body
Seal where the seal seat surface of the valve overlaps the seal surface of the valve
Sex is further enhanced. Therefore, this valve is
Demonstrate the characteristics. In addition, synthetic resin or molding resin
The molding shrinkage ratio is defined as the curing after injection molding of the resin.
It means the shrinkage before and after molding.

According to a second aspect of the present invention, there is provided a valve according to the first aspect, wherein a screw shaft portion projects coaxially with the shaft portion of the rotating member, and an end face of the second bearing portion. Is formed as a receiving surface, and a pressing surface provided on a nut body screwed into the screw shaft portion is slidably overlapped on the receiving surface, and the valve body is tightened by tightening the nut body. It is desirable to adopt a configuration in which a seal surface is pressed against the seal seat surface of the valve body.

According to the present invention, since the sealing surface of the valve portion is pressed against the sealing seat surface of the valve body by tightening the nut body, a uniform surface is formed in the entire overlapping area between the sealing surface and the sealing seat surface. Pressure is generated, and high sealing performance is exhibited.

The valve according to the third aspect of the present invention has a communication column and the same cross-sectional diameter at an arbitrary position in the axial direction. A valve stem having a smaller diameter than the other has a shaft member having a diameter smaller than the diameter of the other end at the other end in the axial direction. A valve body formed of a synthetic resin integrally molded body having an inlet passage and an outlet passage that are rotatably held around and that are blocked from communicating with the communication passage by rotation of the valve portion, forming the rotating member. Molding shrinkage of synthetic resin
Rather than the synthetic resin forming the valve body.
The shape contraction rate is large, the entire outer peripheral surface of the valve portion is a seal surface, and a seal seat surface formed on the inner surface of the valve body is slidably overlapped with the entirety of the seal surface. A first bearing portion that embeds a corner-shaped step formed by the one end portion of the valve portion and the valve stem in the valve body and rotatably supports the valve stem;
A second bearing portion that fills a corner-shaped step formed by the other end portion of the valve portion and the shaft portion and that rotatably supports the shaft portion by penetrating the shaft portion. Things.

According to a fourth aspect of the present invention, there is provided a valve provided with a communication passage and having a frustoconical neck at one end in the axial direction and the other end in the axial direction. A valve stem with a diameter not larger than the tip diameter, a shaft part with a diameter not larger than the tip diameter of the other end at the other end, a rotating member protruding coaxially, and this rotating member around the axis thereof A valve body formed of a synthetic resin integrally molded body having an inlet passage and an outlet passage which are rotatably held and communicated with the communication passage by rotation of the valve portion, forming the rotating member. Of synthetic resin
The composite that forms the valve body above the shape shrinkage
The molding shrinkage of the resin is large, the entire outer peripheral surface of the valve portion is a sealing surface, and a sealing seat surface formed on the inner surface of the valve body is overlapped with the entire sealing surface so as to be able to slide tightly. A first bearing portion for burying a recess formed by one end of the valve portion and the valve stem in the valve body to rotatably support the valve stem, and a second end portion of the valve portion. And a second bearing portion that fills the recess formed by the shaft portion and penetrates the shaft portion to rotatably support the shaft portion.

According to the third and fourth aspects of the invention, as in the first aspect of the invention, the valve body is formed of a single component and uses the seal member described at the beginning. Despite the absence, the sealing performance of the sliding portion is ensured, and the first bearing portion and the second bearing portion of the valve body prevent displacement of the valve portion in the axial direction. Ma
Also, from the molding shrinkage of the synthetic resin forming the rotating member,
The molding shrinkage of the synthetic resin that forms the valve body
Molding of synthetic resin to form the valve body
Shrinkage later causes the seal seat surface of the valve body and the seal
The sealing performance at the point of overlap with the tool surface is further enhanced. Success
The meaning of the shape shrinkage is as described above.

According to a fifth aspect of the present invention, there is provided a valve according to any one of the first, second, third and fourth aspects, wherein the rotating member comprises the valve stem and the valve portion. And an integral molded body of a synthetic resin having the shaft portion.

According to the present invention, similarly to the above-described valve body, the rotating member is formed of one part.

According to a sixth aspect of the present invention, there is provided a valve according to any one of the first, second, third, fourth and fifth aspects, wherein the first part of the valve body is provided.
Each of the inner surface of the bearing portion and the outer surface of the valve stem overlapping the inner surface is provided with a recessed portion that cooperates with each other to form an annular enclosed space, and a peripheral wall surface of the enclosed space is provided. An annular sealing material having elasticity housed and held in the closed space is slidably adhered to the whole.

According to a seventh aspect of the present invention, there is provided a valve according to any one of the first, second, third, fourth, and fifth aspects, wherein the second part of the valve body is provided.
Each of the inner surface of the bearing portion and the outer surface of the shaft portion overlapping the inner surface is provided with a recessed portion that cooperates with each other to form an annular enclosed space, and a peripheral wall surface of the enclosed space is provided. An annular sealing material having elasticity housed and held in the closed space is slidably adhered to the whole.

According to the inventions described in claims 6 and 7, the annular sealing material seals between the outer surface of the valve stem and the inner surface of the first bearing portion of the valve body, and the outer surface of the magnetic domain portion. The sealing property between the valve body and the inner surface of the second bearing portion of the valve body is improved.

The valves of the invention described above will be described below.
It can be easily and economically made by the manufacturing method. In this manufacturing method , a valve stem forming a first recessed portion is provided coaxially at one end in the axial direction of a valve portion provided with a communication passage at a location connected to the one end portion, and the valve stem in the axial direction and the like is provided. A rotary member having a shaft portion coaxially protruding from the end portion forming a second concave portion at a location connected to the other end portion is set in a mold as a first core, and an inlet passage and an outlet passage are formed. By setting the second core to the mold, and injecting molding resin into the molding space around the first core and the second core, the rotation of the valve portion causes the communication passage to enter the communication passage. The inlet passage and the outlet passage, which are interrupted in communication, a first bearing portion that fills the first recess and rotatably supports the valve stem, and a second bearing that fills the second recess and penetrates the shaft. Injection molding of a valve body having a second bearing portion rotatably supported by a synthetic resin. Is that.

The valve according to the invention described in claim 8 is the valve according to any one of claims 1, 2, 3, 4, 5, 6, and 7. The melting point of the material forming the rotating member is equal to or higher than the melting point of the synthetic resin forming the valve body.

According to the present invention, when the valve body is manufactured according to the above method , the valve body molded in the molding space is the first body.
There is no or little possibility that the core will fuse to the rotating member set in the mold. Therefore, the valve can be easily manufactured by molding the valve body.

According to a ninth aspect of the present invention, there is provided a valve according to any one of the first, second, third, fourth, sixth, seventh and eighth aspects. The rotating member is formed of PTFE, and the valve body is formed of a synthetic resin selected from a fluororesin or another thermoplastic resin. "PFA", "FEP", "P"
VdF ”and other thermoplastic resins include“ PP ”
"PE""PPS""PEEK""PES""PA"
“POM” is included. Note that “PTFE” is a polytetrafluoroethylene resin, “PFA” is a perfluoroalkoxy fluororesin, “FEP” is ethylene propylene fluoride, “PVdF” is polyvinylidene fluoride, and “P
"P" is polypropylene resin, "PE" is polyethylene resin, "PPS" is polyphenylsulfide resin, "P"
"EEK" is a polyetheretherketone resin, "PE
"S" is an abbreviation for polyethersulfone resin, "PA" is an abbreviation for polyamide resin, and "POM" is an abbreviation for polyacetal resin .

[0023]

FIG. 1 is a longitudinal sectional view showing an embodiment of a valve according to the first and second aspects of the present invention, FIG. 2 is a view taken in the direction of arrow II in FIG. 1, and FIG. 1 is a view as seen in the direction of the arrow III, and FIG. 4 is a view as viewed in the direction of the arrow IV in FIG.

In this valve, the rotating member 5 includes a frusto-conical valve part 52, a cylindrical valve rod 51 coaxially protruding from the large-diameter end of the valve part 52, The valve member 52 is provided with a communication passage 54 orthogonal to the axis of the rotating member 5. The integral member is made of PTFE and has a shaft portion 53 coaxially protruded from a small-diameter end. The diameter of the valve stem 51 is smaller than the diameter of the large-diameter end of the valve part 52, and
The diameter of 3 is the same as the diameter of the small-diameter end of the valve section 52.
In addition, the diameter of the shaft portion 53 may be smaller than the diameter of the small-diameter end portion of the valve portion 52. In the rotating member 5, the outer peripheral surface of the valve portion 52 is a sealing surface 55, and the sealing surface 55 is finished to a predetermined surface roughness by machining.

The valve body 6 has a body 61 around the valve 52, a first bearing 62 projecting from the body 61 and surrounding the valve rod 51,
It is an integrally molded PFA having a second bearing portion 63 that penetrates the shaft portion 53 and rotatably supports, and sleeve portions 64 and 65 protruding forward and rearward of the body main body portion 61. In this valve body 6, the inner peripheral surface of the body main portion 61 is a seal seat surface 66, and overlaps the seal surface 55 of the valve portion 52 in a slidable manner. In addition, while the stepped portion 56 formed by the large diameter end of the valve portion 52 and the valve rod 51 is buried in the first bearing portion 62, the diameter of the valve portion 52 is reduced. Small side end and shaft 5
3 form the second bearing 6
It is filled with 3. 2 and 3, a bulging portion 60 is provided at an intermediate portion of the outer peripheral portion 61 of the valve body 6. The bulged portion 60 may be omitted as long as a sealing property can be obtained.

The sleeve portions 64 and 65 are provided with an inlet passage 6.
7 and an outlet passage 68 are provided.
The communication of the communication passage 54 with the communication passage 54 is interrupted by the rotation of the valve portion 52.

A screw shaft portion 58 protrudes coaxially with the shaft portion 53. Further, the end surface of the second bearing portion 63 is
9, the receiving surface 69 has an annular pressing surface 7 provided on the nut body 7 screwed into the screw shaft portion 58.
1 are slidably overlapped. The tightening of the nut body 7 presses the seal surface 55 of the valve portion 52 against the seal seat surface 66 of the valve body 6.
For this reason, a uniform surface pressure is generated in the entire overlapping area between the seal surface 55 and the seal seat surface 66, thereby ensuring high sealing performance. A set screw 72 is screwed between the screw shaft portion 58 and the nut body 7, and the set screw 72 prevents the nut body 7 from loosening, thereby preventing the above-mentioned surface pressure from being reduced.

In the valve described with reference to FIGS. 1 to 4, the material forming the rotating member 5 is PTFE, and the synthetic resin forming the valve body 6 is PFA. Therefore, the melting point of the material forming the rotating member 5 is higher than the melting point of the synthetic resin forming the valve body 6. Further, the molding shrinkage of the synthetic resin forming the valve body 6 is greater than the molding shrinkage of the synthetic resin forming the rotating member 5.

In this valve, the rotating member 5 and the valve body 6 used for the valve are not formed by combining several kinds of members, but are formed as one body. Therefore, this valve has one rotating member 5.
And one valve body 6. In addition, since the seal seat surface 66 of the valve body 6 and the seal surface 55 of the valve portion 52 overlap in a sealingly slidable manner, the sealing property at the overlapping portion is ensured without using a valve seat or a seal ring. I have. Moreover, the sealing surface 55 and the sealing seat surface 6
Since a uniform surface pressure is generated in the entire area of the overlap with 6, a higher sealing property is ensured.

FIG. 5 is a longitudinal sectional view showing an embodiment of the valve according to the third aspect of the present invention. In this valve, the form of the valve portion 52, the seal surface 55 of the valve portion 52, the seal seat surface 66 of the valve body 6, and the like are different from those of the valve described with reference to FIGS. That is, in the valve of FIG. 5, the valve portion 52 has a regular cylindrical shape having the same cross-sectional diameter at an arbitrary position in the axial direction. Also, the diameter of the valve stem 51 protruding coaxially from one axial end of the valve portion 52,
A shaft 53 projecting coaxially from the other axial end of the valve 52
Is smaller than the diameter of one end or the other end of the valve portion 52. Then, the first bearing portion 6 of the valve body 6
2 fills a corner-shaped step formed by one end of the valve portion 52 and the valve rod 51, while the second bearing portion 63
The corner 57a formed by the other end of the valve 52 and the shaft 53 is filled. Other items are the same as those of the valve described with reference to FIGS.

FIG. 6 is a longitudinal sectional view showing an embodiment of the valve according to the fourth aspect of the present invention. Also in this valve, the form of the valve portion 52, the seal surface 55 of the valve portion 52, the seal seat surface 66 of the valve body 6, and the like are different from those of the valve described with reference to FIGS. That is, in the valve of FIG. 6, the valve portion 52 has tapered frustoconical neck portions 52a and 52b at one axial end and the other axial end. Also,
At one end of the valve portion 52, a valve stem 51 having the same diameter as the tip diameter of the one end portion, and at the other end, a shaft portion 53 having the same diameter as the tip diameter of the other end portion are projected coaxially. Then, the first bearing portion 62 of the valve body 6 is formed by the concave portion 5 formed by one end of the valve portion 52 and the valve rod 51.
6b, while the second bearing 63 fills a recess 57b formed by the other end of the valve 52 and the shaft 53. Other items are the same as those of the valve described with reference to FIGS.

In the valve described with reference to FIGS. 5 and 6,
It is composed of two parts, one rotating member 5 and one valve body 6. In addition, since the seal seat surface 66 of the valve body 6 and the seal surface 55 of the valve portion 52 overlap in a sealingly slidable manner, the sealing property at the overlapping portion is ensured without using a valve seat or a seal ring. I have.

Each of the valves described with reference to FIGS. 1 to 4 can be manufactured by a manufacturing method described below as an example.
That is, as shown in FIG. 7, a rotating member 5 made of an integrally molded body of PTFE is formed in advance, and the rotating member 5 is
As a core 110, an injection molding die 1 having a molding surface 101 on which the outer contour of the valve body 6 can be molded.
Set to 00. In addition, the mold 1 is used as the first core 110.
In the rotating member 5 set to 00, the step 56 described with reference to FIG. 1 corresponds to the first recess 81, and the recess 57 corresponds to the second recess 82. Rotating member 5 is connected to first core 11
At the same time, the second core 120 made of metal is inserted into the communication passage 54 provided in the valve portion 52 of the rotating member 5 so that the second core 120 made of metal is inserted into the communication passage 54. The second core 120 is prevented so that the molding resin is prevented from entering, and the inlet passage 67 and the outlet passage 68 of the valve body 6 can be formed by the second core 120.
Is set in the mold 100. Further, the third metal cores 130 and 140 having a molding surface for molding the inner peripheral surfaces of the sleeve portions 64 and 65 are attached to the second core 120.
And set in the mold 100.

In this way, the rotating member 5 used as the first core 110 is kept at room temperature or preheated to the mold temperature, and the first core 110, the second core 120, and the third core PFA in a molten state, which is a molding resin for molding the valve body 6, is injected into a molding space S formed around 130 and 140, and after a certain cooling time, the PFA is cured and Remove from mold 100. In this way, the body 61, the first bearing 62, the second bearing 63, and the sleeves 64, 65 having the inlet passage 67 and the outlet passage 68 described with reference to FIGS.
It is molded as an integral molded body of FA.

By performing such a manufacturing method, the first core 1
PT, which is the material of the rotating member 5 used as 10
The melting point of FE is PFA which is a molding material of the valve body 6.
, The valve body 6 is molded without fusion during injection molding. Moreover, PTF
Since the molding shrinkage of PFA is larger than the molding shrinkage of E, after injection molding, the valve seat 52 of the valve body 6 made of PTFE is made of the seal seating surface 66 of the valve body 6 made of PFA.
The sealing surface 55 surely comes into close contact with the sealing surface 55, which helps to improve the sealing performance at the overlapping portion between the sealing seat surface 66 and the sealing surface 55.

In the method of manufacturing the valve described with reference to FIGS. 1 to 6 and the valve illustrated in FIG. 7, PTFE is used for the material of the rotating member 5 and the molding material of the valve body 6 is used.
Although it has been used having a melting point lower PFA than PTFE, even for the same melting point of the rotating member 5 and the valve body 6, when injection molding the valve body 6, the molding material of the valve body 6 is first Fusing to the rotating member 5 used as one core 110 is unlikely to occur. This is because both resins do not fuse even if the molten resin touches the cooled resin.

[0037] In the manufacturing method of the valve described in the valve as well as FIG. 7 described in FIGS. 1 to 6, bar Rububodi 6
It is possible to select various materials as the material of.
Specifically, as the material of the bar Rububodi 6, the PFA
In addition, fluoroplastics such as FEP and PVdF, and PP and P
A synthetic resin selected from other thermoplastic resins such as E, PPS, PEEK, PES, PA, and POM can be used.

When a synthetic resin such as PTFE is used as the material of the rotating member 5, the maximum value of the surface roughness Rmax is used.
Has been confirmed to be able to secure a high degree of the above-mentioned sealing performance when processed to 8 μm or less.

In the above-mentioned valve , the sealing performance at the overlapping portion between the seal seat surface 66 of the valve body 6 and the seal surface 55 of the valve portion 52 differs depending on the magnitude of the holding force of the valve portion 52 by the body main portion 61. In order to prevent the holding force from deteriorating, it is useful to form a ring-shaped bulged portion 60 as shown in FIGS. The magnitude of the holding force is related to the molding shrinkage and the tensile strength of the molding material of the valve body 6. That is,
The valve body 6 formed of a synthetic resin having a large molding shrinkage ratio has a large holding force of the valve portion 52 even if the tensile strength is small, and conversely, the valve body 6 formed of a synthetic resin having a large tensile strength. Means that even if the molding shrinkage is small,
Holding power increases. In the case of a valve used in a semiconductor manufacturing process, the molding material of the valve body 6 preferably has a shrinkage of 2% or more, particularly preferably 4% or more. Such a shrinkage is satisfied by using PFA for the molding material. Further, the tensile strength of the molding material of the valve body 6 is preferably 200 kg or more,
Particularly preferably, the weight is 300 kg or more.

Next, specific values of the molding shrinkage and the tensile strength of the synthetic resin that can be selected as the material of the valve body 6 will be described. Which material to choose depends on
It should be determined appropriately in consideration of the purpose, economy, and other conditions of the valve.

Shrinkage (%) Tensile strength (kg / cm ² ) PFA 3-5 300 PP 1-2400 PE 1-2 150 PPS 0.5-1900 PPS (with glass fiber) 0.2-0. 5 1300 PEEK 1900 PEEK (with glass fiber) 0.5 1700 PES 0.6 800 PES (with glass fiber) 0.2-0.5 1400 PA 1.5 700 POM 1.5 600

The valves of the present invention, as described above, the sealing surface 55 of the seal seat surface 66 and the valve portion 52 of the valve body 6
The sealability of the overlapped portion is ensured by the overlap between them so that they can be hermetically slid. A measure for further improving the sealability will be described below.

The countermeasure shown in FIG. 6 is to cooperate with each of the first bearing portion 62 of the valve body 6 and the outer peripheral surface of the valve rod 51 overlapping the inner surface of the first bearing portion 62. Semicircular concave portions 92 and 93 forming an annular closed space 91 are provided, and an elastic rubber O-ring accommodated and held in the closed space 91 is provided on the entire peripheral wall surface of the closed space 81. The annular sealing material 94 is slidably adhered. The valve in which such measures are taken is used as the first core 110 described above in the mold 10.
A semicircular groove-shaped recess 93 is formed in advance on the valve rod 51 of the rotating member 5 set to 0, and the inner half of the annular sealing material 94 having a circular cross section is housed and held in the recess 93. In this state, the valve body 6 can be easily manufactured by injection molding of the valve body 6 described with reference to FIG. By adopting this manufacturing method, it is not necessary to incorporate the annular sealing material 94 into the rotating member 5 or the valve body 6 later.

When the annular sealing member 94 is housed and held in the closed space 91 as described above, the sealing property between the rotating member 5 and the valve body 6 is enhanced by the annular sealing member 94.

[0045]

As described above, according to the present invention, valves of the present invention
The valve body is made of a single synthetic resin body, and the sealing performance is ensured by the overlap between the seal seat surface of the valve body and the seal surface of the valve portion of the rotary member. The number of points is reduced, and at the same time, assembly workability and cost are greatly improved as compared with the conventional valve.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a valve according to the first and second aspects of the present invention.

FIG. 2 is a view taken in the direction of the arrow II in FIG.

FIG. 3 is a view taken in the direction of the arrow III in FIG. 1;

FIG. 4 is a view taken in the direction of the arrow IV in FIG. 1;

FIG. 5 is a longitudinal sectional view showing an embodiment of the valve according to the third aspect of the present invention.

FIG. 6 is a longitudinal sectional view showing one embodiment of the valve according to the invention described in claim 4;

FIG. 7 is a longitudinal sectional view for explaining a method of manufacturing a valve according to the present invention.

FIG. 8 is a partial longitudinal sectional view showing a measure for improving the sealing property.

[Explanation of symbols]

 Reference Signs List 5 rotating member 6 valve body 7 nut body 51 valve rod 52 valve portion 52a, 52b neck portion 53 shaft portion 54 communication passage 55 sealing surface 56 step portion 56a step portion 56b recess portion 57 recess portion 57a step portion 57b recess portion 58 screw shaft portion 62 first bearing portion 63 second bearing portion 66 seal seating surface 67 inlet passage 68 outlet passage 69 receiving surface 71 pressing surface 81 first concave portion 82 second concave portion 92, 93 concave portion 94 annular seal material 110 first core 120 Second Core

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16K 5/02

Claims (9)

(57) [Claims] 1. A valve stem having a diameter smaller than the diameter of the large-diameter side end of the large-diameter side end of the frusto-conical valve portion having the communication passage, and the valve stem having the diameter smaller than the diameter of the large-diameter side end. A shaft portion having a diameter not larger than the diameter of the small-diameter side end portion is provided with a rotating member protruding coaxially, the rotatable member being rotatably held around its axis, and the communication passage formed by rotation of the valve portion. a valve body formed of integrally molded body of synthetic resin having an inlet passage and an outlet passage is blocked communicating with, from molding shrinkage of the synthetic resin forming the rotary member
The molding resin of the synthetic resin that forms the valve body
The contraction ratio is large, the entire outer peripheral surface of the valve portion is a sealing surface, and a sealing seat surface formed on the inner surface of the valve body is overlapped with the entire sealing surface so as to be able to slide tightly.
A first bearing portion for burying a corner-shaped step formed by the large-diameter end portion of the valve portion and the valve stem in the valve body and rotatably supporting the valve stem; A second bearing portion which fills a concave portion formed by the small-diameter end portion and the shaft portion and penetrates the shaft portion to rotatably support the shaft portion. 2. A screw shaft protrudes coaxially with the shaft of the rotating member, and an end face of the second bearing is formed as a receiving surface, and the receiving shaft is screwed into the screw shaft. A pressing surface provided on the nut body is slidably overlapped with the nut body, and a seal surface of the valve portion is pressed against the seal seat surface of the valve body by tightening the nut body. 2. The valve according to 1. 3. A valve rod having a communication passage and having a diameter smaller than the diameter of one end of an axially one end portion of a regular cylindrical valve portion having the same cross-sectional diameter at an arbitrary position in the axial direction. However, at the other end in the axial direction, a shaft portion having a diameter smaller than the diameter of the other end portion, respectively, a rotating member protruding coaxially, and the rotatable member is rotatably held around its axis, and A valve body formed of an integral molded body of synthetic resin having an inlet passage and an outlet passage interrupted by the rotation of the valve portion to communicate with the communication passage, and a molding shrinkage ratio of the synthetic resin forming the rotating member Than
The molding resin of the synthetic resin that forms the valve body
The contraction ratio is large, the entire outer peripheral surface of the valve portion is a sealing surface, and a sealing seat surface formed on the inner surface of the valve body is overlapped with the entire sealing surface so as to be able to slide tightly.
A first bearing portion that embeds a corner-shaped step formed by the one end portion of the valve portion and the valve stem in the valve body to rotatably support the valve stem; A valve, comprising: a second bearing portion that fills a corner-shaped step formed by the other end portion and the shaft portion and that rotatably supports the shaft portion by penetrating the shaft portion. 4. A valve having a communicating passage and having a diameter at the one end of the valve portion having a frustoconical neck at one end in the axial direction and the other end in the axial direction, the diameter being not larger than the diameter of the tip of the one end. The rod has, at its other end, a shaft part having a diameter not larger than the tip diameter of the other end, a rotating member protruding coaxially, and the rotating member rotatably holding the rotating member around its axis and the valve part. A valve body formed of an integral molded body of synthetic resin having an inlet passage and an outlet passage that are interrupted by the rotation of the communication passage, based on the molding shrinkage of the synthetic resin forming the rotating member.
The molding resin of the synthetic resin that forms the valve body
The contraction ratio is large, the entire outer peripheral surface of the valve portion is a sealing surface, and a sealing seat surface formed on the inner surface of the valve body is overlapped with the entire sealing surface so as to be able to slide tightly.
A first bearing portion for burying a recess formed by one end of the valve portion and the valve stem in the valve body to rotatably support the valve stem; the other end of the valve portion; and the shaft. A second bearing portion that fills a recess formed by the first portion and rotatably supports the shaft portion by penetrating the shaft portion. 5. The rotary member according to claim 1, 2 or 3, wherein the rotary member is formed of a synthetic resin body having the valve stem, the valve portion, and the shaft portion. The valve according to any one of the above. 6. A recessed portion cooperating with each other to form an annular closed space in each of an inner surface of the first bearing portion of the valve body and an outer surface of the valve stem overlapping the inner surface. Is provided, on the entire peripheral wall surface of the closed space,
The valve according to any one of claims 1, 2, 3, 4, and 5, wherein an elastic annular sealing material housed and held in the closed space is slidably adhered. 7. A recessed portion cooperating with each other to form an annular closed space in each of an inner surface of a second bearing portion of the valve body and an outer surface of the shaft portion overlapping the inner surface. Is provided, on the entire peripheral wall surface of the closed space,
The valve according to any one of claims 1, 2, 3, 4, and 5, wherein an elastic annular sealing material housed and held in the closed space is slidably adhered. 8. The method according to claim 1, wherein the melting point of the material forming the rotating member is equal to or higher than the melting point of the synthetic resin forming the valve body.
The valve according to any one of claims 4, 5, 6, and 7. 9. The method according to claim 1, wherein the rotating member is formed of PTFE, and the valve body is formed of a synthetic resin selected from a fluororesin or another thermoplastic resin. The valve according to any one of claims 3, 4, 6, 7, and 8.