DISPENSING VALVE APPARATUS

Abstract

A dispensing valve apparatus with less fluctuation in the dispensing rate is provided. The dispensing valve apparatus is a dispensing valve apparatus that closes off a fluid by a valve member and a valve member seat making contact with each other and is characterized in that a section of the valve member seat making contact with the valve member is made of a material having a tensile elastic modulus of 2 GPa or greater. Alternatively, the dispensing valve apparatus is a dispensing valve apparatus that closes off the fluid by the valve member and the valve member seat making contact with each other and is characterized in that the section of the valve member seat making contact with the valve member is made of a material having a compressive elastic modulus of 2 GPa or greater.

Claims

1. A dispensing valve apparatus that closes off a fluid by a valve member and a valve member seat making contact with each other, characterized in that a section of the valve member seat making contact with the valve member is made of a material having a tensile elastic modulus of 2 GPa or greater.

2. A dispensing valve apparatus that closes off a fluid by a valve member and a valve member seat making contact with each other, characterized in that a section of the valve member seat making contact with the valve member is made of a material having a compressive elastic modulus of 2 GPa or greater.

3. The dispensing valve apparatus according to claim 1, characterized in that the valve member is a needle valve member.

4. The dispensing valve apparatus according to claim 1, characterized in that the dispensing valve apparatus is a fixed dispensing valve apparatus.

5. The dispensing valve apparatus according to claim 1, characterized in that the material configuring the section of the valve member seat making contact with the valve member is one type of material selected from the group of polyetheretherketone, polyimide and stainless-steel.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG. 1 is a schematic diagram of a dispensing valve apparatus.

[0016] FIGS. 2A to 2C are schematic diagrams illustrating the principle in the conventional dispensing valve apparatus, wherein the flow path is widened by the valve member seat being deformed by being pressed by the valve member, and thus the liquid amount increases.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] FIG. 1 is a schematic cross-sectional diagram showing the configuration of a dispensing valve apparatus 1 according to an embodiment of the present invention. More specifically, the dispensing valve apparatus 1 is provided with a valve member 11 and a valve member seat 12 in a valve body 10. The flow path of fluid between a supply port 13 and a dispensing port 14 is closed by the valve member 11 and valve member seat 12 making contact with each other. The dispensing valve apparatus 1 of the present embodiment is characterized in that a section 12a of the valve member seat 12 making contact with the valve member 11 is made of a material having a tensile elastic modulus of 2 GPa or greater.

[0018] In addition, the dispensing valve apparatus 1 is a dispensing valve apparatus that closes off the fluid by the valve member 11 and the valve member seat 12 making contact with each other and that is characterized in that the section 12a of the valve member seat 12 making contact with the valve member 11 is made of a material having a compressive elastic modulus of 2 GPa or greater.

[0019] The valve member 11 is preferably a needle valve member. Further, the dispensing valve apparatus 1 is preferably a fixed dispensing valve apparatus.

[0020] The material of the section 12a of the valve member seat 12 making contact with the valve member 11 is not particularly limited, as long as the tensile elastic modulus thereof is 2 GPa or greater; however, it is preferable for such material to be one type of material selected from the group of polyetheretherketone (PEEK), polyimide and stainless-steel.

[0021] The tensile elastic modulus of the section 12a of the valve member seat 12 making contact with the valve member 11 is preferably 3 GPa or greater, more preferably, 4 GPa or greater, and even more preferably 100 GPa or greater. The tensile elastic modulus of the section 12a of the valve member seat 12 making contact with the valve member 11 is preferably higher since it will then be less deformable; however, it is preferable to use a material having a tensile elastic modulus that is equal to or less than the tensile elastic modulus of a section of the valve member 11 making contact with the valve member seat 12 so as to avoid damaging the valve member 11.

[0022] The valve member seat 12 may be made of a single material or a combination of a plurality of materials. For example, a material having a tensile elastic modulus of less than 2 GPa may be used for sections other than the section 12a of the valve member seat 12 making contact with the valve member 11.

[0023] It should be noted that the tensile elastic moduli of resin materials are specified in ASTM D651, and the tensile elastic moduli of metallic materials are specified in JIS Z 2280:1993. The tensile elastic moduli herein are values at a room temperature.

[0024] The material of the section 12a of the valve member seat 12 making contact with the valve member 11 is not particularly limited, as long as the compressive elastic modulus thereof is 2 GPa or greater; however, it is preferable for such material to be one type of material selected from the group of polyetheretherketone (PEEK), polyimide and stainless-steel.

[0025] The compressive elastic modulus of the section 12a of the valve member seat 12 making contact with the valve member 11 is preferably 3 GPa or greater, more preferably 4 GPa or greater, and even more preferably 100 GPa or greater. The compressive elastic modulus of the section 12a of the valve member seat 12 making contact with the valve member 11 is preferably higher since it will then be less deformable; however, it is preferable to use a material having a compressive elastic modulus that is equal to or less than the compressive elastic modulus of a section of the valve member 11 making contact with the valve member seat 12 so as to avoid damaging the valve member 11.

[0026] The valve member seat 12 may be made of a single material or a combination of a plurality of materials. For example, a material having a compressive elastic modulus of less than 2 GPa may be used for sections other than the section 12a of the valve member seat 12 making contact with the valve member 11.

[0027] It should be noted that the compressive elastic moduli of resin materials are specified in ASTM D651. The compressive elastic moduli herein are values at a room temperature.

[0028] The section 12a of the valve member seat 12 making contact with the valve member 11 is preferably made of a material having a tensile elastic modulus of 2 GPa or greater and a compressive elastic modulus of 2 GPa or greater.

[0029] The valve member seat 12 is preferably formed in a ring-shape and arranged between the dispensing port 14 and the valve member 11. It should be noted that the centers of the valve member 11, valve member seat 12 and dispensing port 14 are preferably arranged in the same straight line.

EXAMPLES

[0030] Hereinafter, the present invention will be described based on examples and a reference example; however, the present invention is not limited to such examples.

Example 1

[0031] A ring-shaped valve member seat made of polypropylene (PP), against which a valve member (SUS304) was pressed, of a high precision liquid dispensing valve apparatus AV502 from Iwashita Engineering, Inc. was replaced with a valve member seat made of PEEK formed in the same shape (manufactured by VICTREX, with a tensile elastic modulus of 3.7 GPa and a compressive elastic modulus of 4.1 GPa).

[0032] Silicone resin was supplied through a liquid input port of the AV502 valve apparatus at a supplying pressure of 0.30 MPa. A vernier handle for adjustment located at the upper part of the AV502 valve apparatus was adjusted and the opening degree of the cylinder was set such that the liquid dispensing rate of a duration of 10 seconds was approximately 0.3 g.

[0033] One hour after closing the valve apparatus and shutting off the liquid, air for closing/opening the valve apparatus was supplied to the AV502 valve apparatus and the liquid was dispensed. When the liquid dispensing rate of the duration of 10 seconds was measured seven times at one minute intervals, the maximum liquid dispensing rate was 0.32 g and the minimum liquid dispensing rate was 0.27 g, and thus, the amount of fluctuation thereof was 0.05 g.

Example 2

[0034] A ring-shaped valve member seat made of polypropylene (PP), against which a valve member (SUS304) was pressed, of a high precision liquid dispensing valve apparatus AV502 from Iwashita Engineering, Inc. was replaced with a valve member seat made of polyimide formed in the same shape (Vespel manufactured by DuPont, with a tensile elastic modulus of 3.2 GPa and a compressive elastic modulus of 2.4 GPa).

[0035] Silicone resin was supplied through a liquid input port of the AV502 valve apparatus at a supplying pressure of 0.30 MPa. A vernier handle for adjustment located at the upper part of the AV502 valve apparatus was adjusted and the opening degree of the cylinder was set such that the liquid dispensing rate of a duration of 10 seconds was approximately 0.3 g.

[0036] One hour after closing the valve apparatus and shutting off the liquid, air for closing/opening the valve apparatus was supplied to the AV502 valve apparatus and the liquid was dispensed. When the liquid dispensing rate of the duration of 10 seconds was measured seven times at one minute intervals, the maximum liquid dispensing rate was 0.33 g and the minimum liquid dispensing rate was 0.27 g, and thus, the amount of fluctuation thereof was 0.06 g.

Example 3

[0037] A ring-shaped valve member seat made of polypropylene (PP), against which a valve member was pressed, of a high precision liquid dispensing valve apparatus AV502 from Iwashita Engineering, Inc. was replaced with a valve member seat made of stainless-steel formed in the same shape (SUS304, with a tensile elastic modulus of 193 GPa and a compressive elastic modulus of 170 GPa).

[0038] Silicone resin was supplied through a liquid input port of the AV502 valve apparatus at a supplying pressure of 0.30 MPa. A vernier handle for adjustment located at the upper part of the AV502 valve apparatus was adjusted and the opening degree of the cylinder was set such that the liquid dispensing rate of a duration of 10 seconds was approximately 0.3 g.

[0039] One hour after closing the valve apparatus and shutting off the liquid, air for closing/opening the valve apparatus was supplied to the AV502 valve apparatus and the liquid was dispensed. When the liquid dispensing rate of the duration of 10 seconds was measured seven times at one minute intervals, the maximum liquid dispensing rate was 0.31 g and the minimum liquid dispensing rate was 0.29 g, and thus, the amount of fluctuation thereof was 0.02 g.

Comparative Example 1

[0040] A ring-shaped valve member seat made of polypropylene (PP) (with a tensile elastic modulus of 1.5 GPa and a compressive elastic modulus of 1.5 GPa), against which a valve member was pressed, of a high precision liquid dispensing valve apparatus AV502 from Iwashita Engineering, Inc. was used as is.

[0041] Silicone resin was supplied through a liquid input port of the AV502 valve apparatus at a supplying pressure of 0.30 MPa. A vernier handle for adjustment located at the upper part of the AV502 valve apparatus was adjusted and the opening degree of the cylinder was set such that the liquid dispensing rate of a duration of 10 seconds was approximately 0.3 g.

[0042] One hour after closing the valve apparatus and closing off the liquid, air for closing/opening the valve apparatus was supplied to the AV502 valve apparatus and the liquid was dispensed. When the liquid dispensing rate of the duration of 10 seconds was measured seven times at one minute intervals, the maximum liquid dispensing rate was 0.57 g and the minimum liquid dispensing rate was 0.26 g, and thus, the amount of fluctuation thereof was 0.31 g.

TABLE-US-00001 TABLE 1 Silicone solution dispensing rate of a duration of 10 seconds 1.sup.st 2.sup.nd 3.sup.rd 4.sup.th 5.sup.th 6.sup.th 7.sup.th Example 1 0.32 0.31 0.30 0.28 0.28 0.27 0.28 Example 2 0.33 0.31 0.30 0.28 0.27 0.27 0.27 Example 3 0.30 0.30 0.31 0.30 0.29 0.30 0.30 Comparative 0.57 0.51 0.44 0.39 0.38 0.35 0.26 Example 1

[0043] As shown in Table 1, as compared to Comparative Example 1, the fluctuation in the dispensing rate can be suppressed by using Examples 1 to 3 according to the present invention.

[0044] It should be noted that the present invention is not limited to the above-described embodiments. The above-described embodiments are illustrative, and any embodiments having substantially the same configuration as the technical idea described in the claims and achieving similar effects are encompassed within the technical scope of the present invention.