JP7091105B2 - Valve device - Google Patents

Description

The present invention relates to a valve device.

Patent Document 1 describes a technique for suppressing the rotation of a spindle due to water pressure from a water supply source (supply source) in a valve device used for a faucet.
As shown in FIG. 9A, the valve device 50 of Patent Document 1 includes a cylindrical housing 51, a spindle 52 arranged inside the housing 51, a shaft 53 integrally movable with the spindle 52, and a shaft 53. It is provided with a valve body 54 attached to the. An operation handle 55 is connected to the spindle 52. The spindle 52 is configured to be able to reciprocate while rotating in the housing 51 by screwing the male screw portion 52a on the outer periphery into the female screw portion 51a on the inner circumference of the housing 51. Further, by rotating the spindle 52, the valve body 54 attached to the shaft 53 is also configured to be able to reciprocate.

As shown in FIG. 9B, the other end side of the spindle 52 is exposed from the housing 51. The spindle 52 and the operation handle 55 are rotatably connected to each other in a state where the exposed other end side and the inner wall surface of the handle fitting 56 attached to the operation handle 55 are meshed with each other. Then, the linear spring material 57 attached to the operation handle 55 and the recess 51b provided on the end surface on the other end side of the housing 51 engage with each other to rotate the operation handle 55. Resistance is given. Therefore, even if the water pressure from the water supply source is applied to the valve body 54 from the water supply channel 58 side and a force acts on the spindle 52 in the direction in which the spindle 52 rotates, the rotation of the spindle 52 is suppressed.

Japanese Unexamined Patent Publication No. 11-315936

In the valve device of Patent Document 1, since the rotation of the spindle 52 is suppressed by the engagement between the spring material 57 and the recess 51b of the housing 51, the operation handle 55 is affected by the deterioration of the spring material 57 and the wear of the recess 51b. Resistance may decrease over time. The present invention has been made in view of these circumstances, and an object of the present invention is to provide a valve device capable of suitably suppressing the rotation of a spindle due to the pressure of a fluid of a supply source.

The valve device for solving the above-mentioned problems is provided with a fluid inlet at the end in the axial direction, and has a tubular housing in which the fluid flowing in from the inlet flows through the inside and flows out from the outlet, and the housing. A valve device including a spindle rotatably arranged inside and a valve body that opens and closes the inflow port by reciprocating in an axial direction inside the housing as the spindle rotates. A pressure chamber is provided between the and the spindle, and the spindle is screwed into either the housing or the valve body in the pressure chamber and the communication passage connecting the inlet and the pressure chamber. A threaded portion is provided, and one of the spindle and the valve body is pressurized in a direction facing the inflow port by the pressure of the fluid flowing into the pressure chamber through the communication passage. The gist is to have a department.

According to this configuration, either the spindle or the valve body has a pressurized portion that is pressurized in a direction facing the inflow port by the pressure of the fluid flowing into the pressure chamber through the communication passage. The pressure applied to the valve body from the inflow port side can be relieved. Since the force acting in the direction in which the spindle rotates can be weakened, the rotation of the spindle can be suppressed.

Regarding the valve device, the pressurized portion may be configured on the upper surface of a flange portion protruding outward in the radial direction of the spindle, and the collar portion may be located at an end portion on the inflow port side in the pressure chamber. preferable. According to this configuration, by applying the pressure of the fluid in the pressure chamber to the upper surface of the flange portion, the spindle can be efficiently pressurized in the direction facing the inflow port. Therefore, the rotation of the spindle can be suppressed more effectively.

With respect to the valve device, it is preferable that the area of the upper surface of the flange portion of the spindle is equivalent to the opening area of the inflow port. According to this configuration, the cross-sectional area of the crosspiece is suitable for suppressing the rotation of the spindle.

For the valve device, it is preferable that a seal portion is formed between the outer periphery of the flange portion and the inner circumference of the housing. According to this configuration, the entire flange portion can be arranged in the pressure chamber, so that the entire upper surface of the collar portion can be used as the pressurized portion.

For the valve device, the outlet is preferably formed on the peripheral surface of the housing. According to this configuration, the peripheral surface of the housing can be used as a fluid outlet.

According to the valve device of the present invention, the rotation of the spindle can be suppressed.

The perspective view of the faucet of this embodiment. Partial sectional view of the faucet of this embodiment. Perspective view of the valve device. (A) and (b) are exploded perspective views of the valve device. Sectional view of the valve device. (A) and (b) are sectional views of a valve device attached to a faucet body. Sectional drawing of the valve device of the modified example. Sectional drawing of the valve device of another modification. (A) is a partial cross-sectional view of a conventional faucet, and (b) is an exploded perspective view of the conventional faucet.

An embodiment of the valve device will be described.
As shown in FIGS. 1 and 2, the valve device 10 is used by being attached to a tubular faucet main body 12 protruding from the wall surface 11. The valve device 10 includes a cylindrical housing 20, a spindle 30 rotatably arranged in the housing 20, and a valve body 40 attached to one end of the spindle 30.

As shown in FIGS. 2 and 3, a part of the spindle 30 protrudes from the other end side of the housing 20, and an operation handle 17 is attached to the protruding part. Then, the spindle 30 can be rotated by rotating the operation handle 17. The valve body 40 is configured to be able to reciprocate in the axial direction inside the housing 20 as the spindle 30 rotates. The position of the valve body 40 is configured to be able to control the open / closed state of the first opening hole 21b as a water inlet provided at one end of the housing 20 in the axial direction. Then, by controlling the open / closed state of the first opening hole 21b, the flow rate of the water flowing in from the first opening hole 21b can be adjusted.

The housing 20 will be described.
As shown in FIGS. 4A, 4B, and 5B, the housing 20 is configured with the first cylinder body 21 and the second cylinder body 22 connected to each other. The first tubular body 21 is provided with a bottom wall 21a at one end, and a first opening hole 21b is provided at the center of the bottom wall 21a. Further, an annular first seal member 21c is arranged at a position surrounding the first opening hole 21b at one end. The first opening hole 21b functions as an inlet for water in the housing 20. A second opening hole 21d penetrating the peripheral surface is formed on the peripheral surface on one end side of the first tubular body 21. A plurality of second opening holes 21d are formed along the circumferential direction and are arranged so as to be evenly spaced from each other. The second opening hole 21d functions as an outlet for water in the housing 20. A step 21g is formed on the inner circumference of the opening on the other end side of the first cylinder 21, and a first screw groove 21e is formed on one end side of the step 21g. A concave groove 21h extending over the entire circumference is formed between the second opening hole 21d and the first screw groove 21e on the inner circumference of the first tubular body 21, and an annular second seal member is formed in the concave groove 21h. 21f is arranged.

The second tubular body 22 has a small diameter portion 22a located on one end side, a medium diameter portion 22b continuously provided on the other end side of the small diameter portion 22a and having a larger diameter than the small diameter portion 22a, and a medium diameter portion 22b. It has a large diameter portion 22c that is continuously provided on the other end side and has a diameter larger than that of the medium diameter portion 22b. The inner diameters of the small diameter portion 22a, the medium diameter portion 22b, and the large diameter portion 22c are configured to be substantially equal to each other.

A second screw groove 22d is formed on the outer periphery of the small diameter portion 22a on one end side so that it can be screwed into the first screw groove 21e of the first cylinder body 21. A concave groove 22k extending over the entire circumference is formed on the other end side of the small diameter portion 22a, and the concave groove 22k is arranged so as to face the step 21g of the opening on the other end side of the first cylinder 21. An annular third seal member 22e is arranged in the annular space surrounded by the concave groove 22k and the step 21g. By arranging the third seal member 22e, when the first screw groove 21e and the second screw groove 22d are screwed to connect the first cylinder 21 and the second cylinder 22, the first screw groove 21e is connected. The connection portion between the cylinder 21 and the second cylinder 22 can be sealed in a watertight state.

As shown in FIGS. 4A, 4B, and 5B, a third screw groove 22f is formed on the outer periphery of the inner diameter portion 22b on one end side, and the inside of the insertion port 13 of the faucet body 12 described later. It is configured so that it can be screwed into the fifth screw groove 13a provided on the circumference. Further, on the other end side of the medium diameter portion 22b, an annular fourth seal member 22g is arranged over the entire circumference. By arranging the 4th seal member 22g, when the 3rd screw groove 22f and the 5th screw groove 13a are screwed together and the 2nd cylinder 22 is attached to the faucet main body 12, the 2nd cylinder The connection portion between the 22 and the faucet body 12 can be sealed in a watertight state.

A fourth screw groove 22h is formed on the inner circumferences of the small diameter portion 22a and the medium diameter portion 22b in the second tubular body 22. The fourth screw groove 22h functions as a screwed portion that is screwed with a screwed portion of the spindle 30 described later and holds the spindle 30 rotatably. The fourth screw groove 22h is composed of a double-threaded screw having two vine windings of the screw groove.

As shown in FIGS. 2 and 5, in the large diameter portion 22c, when the operation handle 17 is attached to the spindle 30, the main body portion 17a of the operation handle 17 covers the outer periphery of the other end side of the large diameter portion 22c. It is configured as follows. An annular fifth seal member 22i is arranged on the inner circumference of the large diameter portion 22c over the entire circumference. Two fifth seal members 22i are arranged side by side at intervals in the axial direction. By arranging the fifth sealing member 22i, it is possible to seal between the inner circumference of the large diameter portion 22c and the outer circumference of the spindle 30 in a watertight state.

The spindle 30 will be described.
As shown in FIGS. 4A, 4B, and 5, the spindle 30 has a columnar main body portion 30a and a flange portion 30b protruding outward in the radial direction at one end of the main body portion 30a. is doing. The crossguard portion 30b has an upper surface 30d which is a surface located on the other end side, and the upper surface 30d functions as a pressurized portion of the spindle 30 as described later. The main body portion 30a is configured to have an outer diameter slightly smaller than the inner diameter of the second cylinder 22 of the housing 20 so that the main body portion 30a can be arranged in a state of being screwed into the screwed portion of the housing 20. The flange portion 30b has an outer diameter larger than the inner diameter of the second cylinder 22 of the housing 20. Further, the collar portion 30b is configured to have an outer diameter smaller than the inner diameter of the first cylinder body 21 of the housing 20, and the outer circumference of the collar portion 30b is attached to the second seal member 21f arranged on the inner circumference of the first cylinder body 21. Is configured to abut. When the outer circumference of the flange portion 30b and the second seal member 21f come into contact with each other, it is possible to seal the outer circumference of the collar portion 30b and the inner circumference of the first cylinder 21 in a watertight state.

The area of the upper surface 30d of the flange portion 30b of the spindle 30 is not particularly limited, but is preferably the same as the opening area of the first opening hole 21b of the housing 20. As a result, the area of the upper surface 30d of the flange portion 30b is suitable for suppressing the rotation of the spindle 30.

The main body 30a of the spindle 30 has a second body so that when the main body 30a is inserted into the second cylinder 22 of the housing 20, the other end of the main body 30a protrudes from the other end of the second cylinder 22. It is longer than the cylinder 22.

A sixth screw groove 30c is formed on the outer periphery of the spindle 30 at a position where the main body portion 30a overlaps with the screwed portion of the housing 20 when the main body portion 30a is inserted into the second tubular body 22 of the housing 20. The sixth thread groove 30c functions as a screwed portion to be screwed with the screwed portion of the housing 20. The sixth screw groove 30c is composed of a double-threaded screw having two vine windings of the screw groove. By screwing the sixth screw groove 30c of the main body 30a of the spindle 30 and the fourth screw groove 22h of the housing 20, the spindle 30 is rotatably arranged in the housing 20.

As shown in FIGS. 4 (b) and 5, the spindle 30 is formed with a first hole 31a extending in the axial direction from the end on one end side. Further, the spindle 30 is formed with a second hole 31b extending in the radial direction of the main body portion 30a. The second hole 31b communicates with the other end side of the first hole 31a and opens to the peripheral surface of the main body portion 30a. A screw groove 31c is formed on the inner circumference of the first hole 31a, and by attaching the screw 41 to the screw groove 31c, the valve body 40 can be fixed to one end side of the main body portion 30a. Has been done. Therefore, the first hole 31a also functions as a screw hole. The second hole 31b is configured to open between the flange portion 30b and the screwed portion on the peripheral surface of the main body portion 30a.

The valve body 40 will be described.
As shown in FIGS. 4A, 4B, and 5B, the valve body 40 is made of an annular plate material, and is fixed by a screw 41 in a state of being in contact with the end surface on one end side of the spindle 30 as described above. Has been done. The outer diameter of the valve body 40 is smaller than the inner diameter of the first cylinder 21 of the housing 20. Further, the outer diameter of the valve body 40 is configured to be larger than the inner diameter of the first opening hole 21b provided in the bottom wall of the first cylinder 21 of the housing 20, so that the first opening hole 21b can be closed. It is configured. The material of the valve body 40 is not particularly limited, but it is preferably made of an elastic material such as rubber. Further, it is preferable that the materials of the sealing members 21c, 21f, 22e, 22g, and 22i are also made of an elastic material such as rubber.

The screw 41 for fixing the valve body 40 is provided with a through hole 41a along the axial direction. The through hole 41a is configured to communicate with the first hole 31a when the screw 41 is attached to the spindle 30.

The procedure for assembling each member constituting the valve device 10 will be described.
First, the valve body 40 is brought into contact with the end surface on one end side of the spindle 30 and fixed with the screw 41. Next, from one end side of the second cylinder 22 of the housing 20, the other end side of the spindle 30 to which the valve body 40 is attached is inserted, and the screwed portion of the second cylinder 22 and the spindle 30 are screwed together. Screw the part. In this state, the other end side of the main body 30a of the spindle 30 protrudes from the other end side of the second cylinder 22.

Next, the first screw groove 21e of the first cylinder 21 is screwed into the second screw groove 22d of the second cylinder 22 of the housing 20 to connect the first cylinder 21 and the second cylinder 22. do. As a result, the flange portion 30b of the spindle 30 is housed in the first cylinder body 21 in a state where the outer periphery thereof is in contact with the second seal member 21f on the inner circumference of the first cylinder body 21. In this way, each member constituting the valve device 10 is assembled. The order of assembling each member is not limited to the above order, and the order of assembling may be changed as appropriate.

As shown in FIG. 5, in a state where each member is assembled, the valve device 10 is surrounded by a housing 20, a spindle 30, a second seal member 21f, a third seal member 22e, and a fifth seal member 22i. An internal space (pressure chamber S) is formed. The pressure chamber S communicates with the outside through the first hole 31a and the second hole 31b of the spindle 30 and the through hole 41a of the screw 41. That is, the first hole 31a, the second hole 31b, and the through hole 41a of the screw 41 of the spindle 30 function as a communication passage 31 that communicates the first opening hole 21b and the pressure chamber S, as shown in FIG. 6A. As shown, the water W of the water supply source is configured to flow into the pressure chamber S through the communication passage 31. Then, the screwed portion of the spindle 30 is provided in the pressure chamber S. Further, the flange portion 30b of the spindle 30 is in a state of being located at the end portion on the one end side in the pressure chamber S, that is, the end portion on the first opening hole 21b (inlet) side.

The procedure for attaching the valve device to the faucet body will be described.
First, the internal structure of the faucet main body 12 to which the valve device 10 is attached will be described. As shown in FIG. 2, inside the faucet main body 12, an upstream water supply channel 14 on the water supply source side, a downstream water discharge channel 15 on the spout side, a water supply channel 14, and a water discharge channel 15 are provided. A partition wall 16 for partitioning is provided. The partition wall 16 is provided with a communication hole 16a for communicating the water supply channel 14 and the water discharge channel 15.

As shown in FIG. 2, when attaching the valve device 10 to the faucet main body 12, first, one end side of the housing 20 in the valve device 10 is inserted into the insertion port 13 provided on the peripheral surface of the faucet main body 12. do. At this time, the valve device 10 is arranged so that the first opening hole 21b of the first cylinder 21 of the housing 20 overlaps the communication hole 16a of the partition wall 16 of the faucet main body 12. Then, the first seal member 21c arranged around the first opening hole 21b of the first cylinder 21 abuts around the communication hole 16a, so that the first opening hole 21b and the communication hole 16a are in a watertight state. Connect with.

Further, the housing 20 is formed by screwing the third screw groove 22f of the medium diameter portion 22b in the second cylinder 22 of the housing 20 into the fifth screw groove 13a on the inner circumference of the insertion port 13 of the faucet body 12. It is connected to the faucet body 12. At this time, the fourth seal member 22g arranged on the other end side of the medium diameter portion 22b is in contact with the end portion of the insertion port 13 of the faucet body 12, and the second cylinder 22 of the housing 20 and water are in contact with each other. The space between the plug body 12 and the insertion port 13 is sealed in a watertight state.

Next, the operation handle 17 is attached to the other end side of the spindle 30 protruding from the other end side of the housing 20 of the valve device 10. By attaching the operation handle 17, it becomes possible to operate the operation handle 17 to rotate the spindle 30 and reciprocate the valve body 40 in the axial direction. In this way, the valve device 10 is in a state of being attached to the faucet main body 12.

The operation of this embodiment will be described.
As shown in FIG. 6A, when the valve body 40 is in contact with the first opening hole 21b of the housing 20, that is, when the separation distance between the valve body 40 and the first opening hole 21b is zero, water. The first opening hole 21b, which is the inlet of W, is closed. Therefore, the flow of water W in the faucet main body 12 is stopped. On the other hand, as shown in FIG. 6B, when the valve body 40 is separated from the first opening hole 21b of the housing 20, the first opening hole 21b is in an open state. Therefore, the water W from the water supply source flows into the first opening hole 21b from the water supply channel 14 and flows out from the second opening hole 21d of the housing 20 to the water discharge channel 15 along the arrow Y3. Then, by adjusting the separation distance between the valve body 40 and the first opening hole 21b, the flow rate of the water W flowing out to the water discharge channel can be adjusted. Here, as shown in FIG. 6A, in a state where the first opening hole 21b is closed, the water W of the water supply source flows into the pressure chamber S through the communication passage 31 of the spindle 30. Then, the pressure of the water W of the water supply source is transmitted into the pressure chamber S through the communication passage 31, and is applied to the upper surface 30d of the flange portion 30b of the spindle 30 that functions as the pressurized portion. Therefore, as shown by the arrow Y1, the upper surface 30d of the flange portion 30b of the spindle 30 is pressurized in the direction facing the first opening hole 21b, and from the first opening hole 21b side to the valve body 40 along the arrow Y2. The pressure applied is relieved.

The effect of this embodiment will be described.
(1) A pressure chamber S is provided between the housing 20 and the spindle 30, and the spindle 30 is screwed into the housing 20 in the communication passage 31 that communicates the first opening hole 21b and the pressure chamber S, and in the pressure chamber S. It is provided with a matching screw portion. The spindle 30 has a pressurized portion that is pressurized in a direction facing the first opening hole 21b by the pressure of water flowing into the pressure chamber S through the communication passage 31.

The spindle 30 has a pressurized portion that is pressurized in a direction facing the first opening hole 21b by the pressure of water flowing into the pressure chamber S through the communication passage 31, so that the first opening hole 21b side. It is possible to relieve the pressure of water applied to the valve body 40. Therefore, since the force acting on the spindle 30 in the opening direction of the valve body 40 can be weakened, the rotation of the spindle 30 can be suppressed. Further, unlike the valve device of the prior art, the rotation is not suppressed by engaging the members with each other, so that it is possible to reduce the influence of deterioration and wear of the members.

(2) The pressurized portion is composed of the upper surface 30d of the flange portion 30b protruding outward in the radial direction of the spindle 30, and the collar portion 30b is located at the end portion on the first opening hole 21b side in the pressure chamber S. .. By applying the pressure of the water in the pressure chamber S to the upper surface 30d of the flange portion 30b, the spindle 30 can be efficiently pressurized in the direction facing the first opening hole 21b. Therefore, the rotation of the spindle 30 can be suppressed more effectively.

(3) The area of the upper surface 30d of the flange portion 30b of the spindle 30 is equivalent to the opening area of the first opening hole 21b. Therefore, the area of the upper surface of the flange portion 30b is suitable for suppressing the rotation of the spindle 30.

(4) A second seal member 21f is formed between the outer circumference of the flange portion 30b and the inner circumference of the housing 20. Therefore, since the entire flange portion 30b can be arranged in the pressure chamber S, the entire upper surface 30d of the flange portion 30b can be efficiently used as the pressurized portion.

(5) The second opening hole 21d, which is the outlet for water, is formed on the peripheral surface of the housing 20. Therefore, the peripheral surface of the housing 20 can be used as a water outlet.
This embodiment can be modified and implemented as follows. The present embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.

The valve device 10 is not limited to the mode used as a flow rate adjusting valve for a faucet. It can also be used as a flow rate adjusting valve for a fluid other than water, and examples of the fluid other than water include oil and an organic solvent.

The 4th screw groove 22h and the 6th screw groove 30c are not limited to the double-threaded screw in which two vine windings of the screw groove are present. If it is configured so that it can be screwed into each other, it may be configured with one screw groove such as a single-threaded screw, or it may be configured with three threaded grooves such as a three-threaded screw. That is, it may be configured so that there are three or more screw grooves.

The first hole 31a of the spindle 30 does not have to have a function as a screw hole. That is, the first hole 31a and the screw hole may be provided individually. The number of the first holes 31a is not limited to one, and a plurality of the first holes 31a may be formed.

The second hole 31b of the spindle 30 is not limited to the mode configured to open between the flange portion 30b and the screw portion. The second hole 31b may be opened at an arbitrary position on the peripheral surface of the main body portion 30a within the range of communication with the pressure chamber S. For example, it may be on the other end side of the screwed portion of the spindle 30, or may be at a position overlapping the screwed portion. The number of the second holes 31b is not limited to one, and a plurality of the second holes 31b may be formed.

The area of the upper surface 30d of the flange portion 30b of the spindle 30 is not limited to the embodiment equal to the opening area of the first opening hole 21b (inflow port). The area of the upper surface 30d of the flange portion 30b of the spindle 30 may be configured to be larger than the opening area of the inflow port, or may be configured to be smaller. When it is configured to be larger than the opening area of the inflow port, the pressure of water applied to the upper surface 30d of the flange portion 30b from the pressure chamber S side is larger than the pressure of water applied to the valve body 40 from the inflow port side. growing. Since it is possible to exert a force on the spindle 30 that rotates in the closing direction of the valve body 40 more than a force that rotates in the opening direction of the valve body 40, the spindle 30 moves in the opening direction of the valve body 40. It is possible to effectively suppress the rotation.

-In the present embodiment, the pressurized portion is composed of the upper surface 30d of the flange portion 30b of the spindle 30, but is not limited to this embodiment. The pressurized portion may be provided on the valve body 40. For example, as shown in FIG. 7, the spindle 30 has a columnar main body portion 30a, and an annular valve body 42 having an outer diameter larger than the outer diameter of the main body portion 30a is provided on an end surface of the main body portion 30a on one end side. It may be attached. Then, the outer circumference of the annular valve body 42 may be configured to abut on the second seal member 21f on the inner circumference of the first cylinder body 21. In this embodiment, the upper surface 42a of the valve body 42 having a diameter larger than the outer diameter of the spindle 30 functions as a pressurized portion.

As another embodiment in which the pressurized portion is provided on the valve body, for example, as shown in FIG. 8, the spindle 30 and the valve body 43 are attached in a screwed state inside the housing 20. It may be an embodiment. In this aspect, the spindle 30 and the valve body 43 are connected in a state where the screwed portion 30e on the outer circumference of the spindle 30 and the screwed portion 43a on the inner circumference of the tubular valve body 43 are screwed together. By rotating the spindle 30, the valve body 43 is configured to be able to reciprocate in the axial direction inside the housing 20. The area surrounded by the housing 20, the spindle 30, the valve body 43, and each sealing member that seals them in a watertight state functions as the pressure chamber S, and the spindle 30 is screwed into the pressure chamber S. A portion 30e is provided. Note that FIG. 8 shows a state in which water W has flowed into the pressure chamber S. The communication passage 31 of the spindle 30 is configured to be located in the pressure chamber S. Then, the end surface 43b on the other end side of the tubular valve body 43 functions as a pressurized portion. That is, the water pressure in the pressure chamber S is applied to the end surface 43b on the other end side of the valve body 43 that functions as the pressurized portion, so that the valve body 43 has the first opening hole as shown by the arrow Y4. It is pressed in the direction facing 21b. As a result, the pressure applied to the valve body 43 from the first opening hole 21b side can be relaxed, and the rotation of the spindle 30 can be suppressed.

10 ... valve device, 20 ... housing, 30 ... spindle, 31 ... communication passage, 40 ... valve body, S ... pressure chamber.

Claims (5)

A cylindrical housing provided with a fluid inlet at the axial end, through which the fluid flowing in from the inlet flows through the interior and outflows from the outlet.
With a spindle rotatably arranged in the housing,
A valve device including a valve body that opens and closes the inflow port by reciprocating in the axial direction inside the housing as the spindle rotates.
A pressure chamber is provided between the housing and the spindle.
The spindle comprises a communication passage connecting the inlet and the pressure chamber, and a screw portion screwed into the housing in the pressure chamber.
The spindle has a pressurized portion that is pressurized in a direction facing the inflow port by the pressure of the fluid flowing into the pressure chamber through the communication passage .
The pressurized portion is composed of an upper surface of a flange portion protruding radially outward in the spindle, and the collar portion is located at an end portion on the inflow port side in the pressure chamber.
The spindle is a valve device characterized in that the flange portion is provided at one end on one end side, and the valve body is fixed to the end surface on one end side of the flange portion . The valve device according to claim 1 , wherein the area of the upper surface of the flange portion of the spindle is equivalent to the opening area of the inflow port. The valve device according to claim 1 or 2 , wherein a seal portion is formed between the outer circumference of the collar portion and the inner circumference of the housing. The valve device according to any one of claims 1 to 3 , wherein the outlet is formed on the peripheral surface of the housing. A cylindrical housing provided with a fluid inlet at the axial end, through which the fluid flowing in from the inlet flows through the interior and outflows from the outlet.
With a spindle rotatably arranged in the housing,
A valve device including a valve body that opens and closes the inflow port by reciprocating in the axial direction inside the housing as the spindle rotates.
A pressure chamber is provided between the housing and the spindle.
The spindle comprises a communication passage connecting the inlet and the pressure chamber, and a screw portion screwed into the housing in the pressure chamber.
The spindle has a pressurized portion that is pressurized in a direction facing the inflow port by the pressure of the fluid flowing into the pressure chamber through the communication passage .
The pressurized portion is composed of an upper surface of a flange portion protruding radially outward in the spindle, and the collar portion is located at an end portion on the inflow port side in the pressure chamber.
A valve device characterized in that the area of the upper surface of the flange portion of the spindle is equivalent to the opening area of the inflow port .

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