JP3029866U - Spray amount control valve - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To increase / decrease a spray amount in two stages in a spray amount adjusting valve equipped in an aerosol container or the like, and arbitrarily press the stem pushing amount required for shifting from the first stage to the second stage. Improves usability by enabling setting. A gasket (1) is held in a housing (1) having a valve hole (13) and a valve seat (14). The stem 4 inserted into the hole 21 of the gasket 2 is loosely fitted in the housing 1. When the stem 4 is pushed into the stem 4, the stem 4 is opened, and when the stem 4 is in the initial position, the gasket 2 is opened.
A stem hole 44 is provided which is closed by. The head portion 61 of the valve rod 6 is provided between the contact portion 49 of the stem 4 and the claw portion 51.
To hold. The head portion 61 includes a receiving portion 62 and an engaging portion 63.
Have and. The valve rod 6 is held by frictional resistance with the valve rod holder 7. The valve rod 6 is provided with a valve portion 65 and a communication passage 64.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a spray amount control valve capable of increasing / decreasing the spray amount of a liquid or gas content contained in a container in two stages.

[0002]

[Prior art]

 A conventional spray amount adjusting valve of this type is described in Japanese Patent Publication No. 62-41074, which is shown in FIG. The valve comprises an upper gasket 120 held by a container mountain cup 100 and a housing 110. In addition, the stem 130 inserted into the hole 121 of the gasket 120 is loosely fitted in the housing 110 so as to be displaceable in the axial direction X. When the stem 130 is located at the initial position shown by the solid line in the figure, the stem hole 131 provided therein is sealed by the gasket 120, and the stem 130 is axially moved from the initial position. During the pushing operation, the stem hole 131 is opened by the bending deformation of the gasket 120 accompanying the pushing of the stem 130. A valve rod 132 is connected to the stem 130, and the valve rod 132 is inserted into a hole 141 of a lower gasket 140 provided in the housing 110 so as to be able to close and slide. The valve rod portion 132 has a large hole passage 133 having a large opening area which penetrates the valve rod portion 132 in a radial direction and an internal passage of the dip tube 112 in which the large hole passage 133 is connected to the connection opening portion 111 of the housing 110. It has a communication passage 134 with a small opening area that is in constant communication with 113. In addition, 142 is a seat plate that is overlaid on the lower gasket 140, and 150 is a coil spring that is interposed between the stem 130 and the seat plate 142 and constantly urges the stem 130 toward the initial position side.

In this valve, when the stem 130 is pushed against the force of the coil spring 150, the stem hole 131 opens. While the pushing amount of the stem 130 is small, the large passage 133 of the valve rod 132 communicates only with the internal space of the housing 110, so that the liquid contents (high pressure) stored in the container and pushed by the high pressure ( After passing through the internal passage 113 of the dip tube 112 and the connection port portion 111, it flows into the internal space V of the housing 110 from the large passage 133 only through the communication passage 134, and from the internal space V, the stem hole 131 to go into. On the other hand, when the pushing amount of the stem 130 is increased so that the large opening 133 communicates with both the internal space V of the housing 110 and the inside of the connection port portion 111 as shown by a phantom line in FIG. A large amount of the liquid content passing through the internal passage 113 of the tube 112 and the connection port 111 flows into the internal space V of the housing 110 through both the large passage 133 and the communication passage 134, and the internal space From V, enter the stem hole 131.

Therefore, in the valve of FIG. 9, the spray amount can be increased / decreased in two steps by selecting the amount of pushing of the stem 130. In addition, in FIG. 9, the pressing amount of the stem 130 when the spray amount is increased is indicated by reference sign S2.

[0005]

[Problems to be solved by the device]

 In the above-described conventional valve, the communication passage 134 and the internal space V of the housing 110 are communicated with each other through the large opening passage 133 having a long hole elongated in the pushing direction of the stem 130. It is necessary to push in the stem 130 until a part of the large passage 133 passes through the lower gasket 140, and when performing a small amount of spraying, the large passage 133 is positioned above the lower gasket 140 so that the lower gasket 140 and the valve rod portion are located. 132, it is necessary to ensure a tight seal with the lower gasket 140, and it is necessary to use a relatively thick wall as the lower gasket 140 in order to keep a tight seal between the lower gasket 140 and the valve rod 132. Therefore, it is required that the position of the large passage 133 is set at a position apart from the lower end (tip) of the valve rod 132 to some extent. Therefore, the pushing amount S2 of the stem 130 when a large amount of spray is performed becomes relatively large, which may impair the usability of the valve or hinder the miniaturization of the valve.

The present invention has been made in view of the above circumstances. That is, the present invention is based on the provision of a spray amount control valve capable of increasing or decreasing the spray amount in two steps. In addition to this, the amount of pushing of the stem required when performing a large amount of spray is set. A spray amount control valve that can be easily set and downsized by setting it to a desired amount, and that reliably switches between small and large sprays. The purpose is to provide.

[0007]

[Means for Solving the Problems]

 The spray amount control valve of the invention according to claim 1 is a valve hole for introducing the above-mentioned contents into the internal space, and a valve hole for introducing the above-mentioned contents into a housing in which the internal space serves as a passage for the contents. A peripheral valve seat is provided, a gasket having a hole is held at the upper end of the housing, and the stem inserted through the hole is loosely fitted in the housing so as to be axially displaceable. A gasket seals the opening between the upper end of the housing and the stem, and the stem is sealed by the gasket when the system is in the initial position and the stem is in the initial position. From the axial direction, the stem hole opened by the bending deformation of the gasket, the push-down contact part, and the contact part with a space in the axial direction. And a catching part corresponding to the hitting part and an engaging part corresponding to the claw part are provided on the valve rod inserted through the valve hole. A head portion retained by the stem so as to be displaceable between the valve portion and the claw portion, and a valve rod for holding the valve rod by frictional resistance between the valve rod and the housing. A holding body is interposed, and when the contact portion hits the receiving portion and pushes down the valve rod by the pushing operation during operation of the stem, the valve rod separates from the valve seat and opens the valve hole. A valve portion that closes the valve hole by hitting the valve seat when the stem is in the initial position and the pawl portion pulls up the valve rod through the engaging portion, and the stem is in the normal state and during operation. Always communicate the inner space of the container with the inner space of the housing That a communication passage, is provided, the stem is, toward the constant initial position by the spring force are resiliently urging, is that.

In the valve having this structure, in the normal state, the claw portion of the stem, which is biased by the spring force, engages with the engaging portion of the head portion and pulls up the head portion, so that the valve portion of the valve rod. Touches the valve seat and closes the valve hole. Further, the stem biased by the spring force is set at a fixed position in which the valve portion is in contact with the valve seat and the claw portion is engaged with the engaging portion of the head portion. The fixed position at this time is the initial position of the stem.

When the stem is pushed against the spring force from the initial position, the spray amount is adjusted in two steps depending on whether the push amount is small or large.

That is, the valve rod is held by the valve rod holding body in the first stage in which the stem is pushed within the range in which the contact portion of the stem hits the receiving portion of the head portion provided on the valve rod. Only the stem is pushed in from, and such pushing of the stem causes the gasket to bend and deform, opening the stem hole. As a result, the stem hole is communicated with the communication passage of the valve rod through the passage formed by the internal space of the housing. Therefore, the content contained in the container flows into the internal space of the housing only through the communication passage and then flows out through the stem hole.

In the second stage in which the stem is further pushed after the contact portion of the stem hits the receiving portion of the head portion, the valve rod is also pushed down together with the stem against the friction resistance with the valve rod holding body. As a result, the valve portion is separated from the valve seat of the housing to open the valve hole. In this state, both the communication passage of the valve rod and the valve hole communicate with the internal space of the housing. Therefore, the contents contained in the container pass through not only the communication passage but also the valve hole into the inner space of the housing and then flow out through the stem hole. Therefore, in the second stage, the amount of the contents flowing out through the stem hole is larger than in the first stage described above.

Here, if the distance between the abutting portion and the receiving portion when the stem is located at the initial position is narrowed, from the first stage to the second stage without increasing the pushing amount of the stem so much. The transition will be made. On the contrary, if the distance between the contact portion and the receiving portion is increased, the transition from the first stage to the second stage cannot be performed unless the pushing amount of the stem is increased.

By the way, the content of the container is a liquid such as a paint or a glass cleaner which is subjected to high pressure in the vapor phase portion, a case where only the gas filled at a high pressure is used, or a case where it is liquefied gas. Sometimes it is a gas-liquid mixture. If the contents are only gas filled with high pressure, the valve operates as described above regardless of whether the container is in an upright position or an inverted position. When the content is a liquid under high pressure in the gas phase, the valve acts as described above when the container is in the inverted position. When the content is a gas-liquid mixture such as liquefied gas, the action of the valve when the container is in the upright position is the same as when the content is only gas filled with high pressure, and the container is in the upright position. At that time, the action of the valve is the same as in the case of a liquid whose contents are under high pressure in the gas phase.

Therefore, even if the content is a liquid, it is preferable that the invention according to claim 2 is adopted in order to cause the valve to perform the above-described operation with the container in the upright posture.

That is, in the spray amount control valve of the invention according to claim 2, the valve part is accommodated in the housing in a loosely fitted manner, and the connection port part communicates with the valve hole and the communication path of the valve rod. Is provided, and a dip tube that is immersed in the liquid content contained in the container is connected to this connection port.

According to this, by keeping the high pressure in the gas phase portion of the container, in the above-described first step, the liquid contents pushed by the high pressure in the gas phase portion form the inner passage of the dip tube. After passing through the connection port, it enters the internal space of the housing only through the communication passage and flows out through the stem hole. Further, in the above-mentioned second stage, after the liquid content pressed by the high pressure in the vapor phase portion passes through the internal passage of the dip tube and the connection port portion, it passes through both the valve hole and the communication passage to enter the internal space of the housing. It enters and flows out through the stem hole. Therefore, in the second stage more liquid content will flow out through the stem holes than in the first stage.

In the spray amount control valve according to the third aspect of the present invention, the push-down contact part of the stem has an upper contact part and a lower contact part having a step in the axial direction of the stem in the circumferential direction. It is divided into different types of contact parts, and by rotating this stem around an axis, the above two types of contact parts are selectively opposed to the receiving part of the head part where the valve rod is connected. It is said that it is possible to let it.

According to this, when the stem is rotated about the axis by a predetermined angle to face the upper contact portion against the receiving portion, the above-described first stage The pushing amount of the stem on the floor becomes large. It is also possible to allow the lower hitting part to contact the receiving part so as to overlap when the lower hitting part is opposed to the receiving part. A two-stage state is obtained.

[0019]

[Embodiment of device]

 FIG. 1 is a partially cutaway front view of a container B equipped with a spray amount control valve A which is an embodiment of the invention according to claim 2. 2 to 4 are sectional views showing the structure of the valve A, and FIG. 5 is a sectional view taken along the line VV of FIG.

The valve A has a housing 1 made of a synthetic resin molded body. As shown in FIGS. 2 to 4, the housing 1 has an upper end 11 fixed to the mountain cup B 1 of the container B by caulking, and is held by the upper end 11 in cooperation with the mountain cup B 1. The gasket 2 is held. Further, a valve hole 13 and a valve seat 14 around the valve hole 13 are integrally provided in the bottom wall 12 of the housing 1, and the bottom wall 12 further has a connection port communicating with the valve hole 13. The part 15 is integrally provided. As shown in FIG. 1, the dip tube 3 is connected to the connection port portion 15. Further, the housing 1 is provided with a through hole 17 which connects the outside of the housing 1 (inside the container B) and the internal space 1a of the housing 1.

The gasket 2 has a hole 21 at the center thereof, and the stem 4 made of a synthetic resin molded body is inserted into the hole 21. A small diameter neck portion 41 provided on the stem 4 corresponds to the hole portion 21 and a large diameter portion 42 below the neck portion 41 is displaceable in the axial direction X (see FIG. 2). The housing 1 is loosely fitted to the housing 1, and a projecting portion 43 above the neck portion 41 projects upward from the opening of the mountain cup B1. A stem hole 44, which opens at the outer peripheral surface of the neck portion 41 and the upper end surface of the protruding portion 43, is formed in the neck portion 41 and the protruding portion 43 of the stem 4, and this system hole 44 is shown in FIG. As described above, it is communicated with the nozzle hole 46 of the spray nozzle 45 attached to the projecting portion 43. Further, the opening 47 of the stem hole 44 located on the outer peripheral surface of the neck portion 41 is adapted to be brought into contact with or separated from the hole portion 21 of the gasket 2 by a pushing operation or a returning operation of the stem 4 which will be described later. . The opening between the upper end 11 of the housing 1 and the stem 4 is sealed by the gasket 2.

The large-diameter portion 42 of the stem 4 is provided with a recessed portion 48 that opens at the lower surface thereof. The upper wall surface of the recessed portion 48 serves as a pressing contact portion 49, whereas the recessed portion 48 has a recessed portion. A pull-up claw portion 51 is provided on the inner peripheral portion of the lower end of the insertion portion 48. Therefore, the contact portion 9 and the claw portion 51 face each other at a position spaced apart in the axial direction X. The claw portion 51 may be annular or may be partially provided at a plurality of locations on the inner peripheral portion of the lower end of the recess 48.

A valve rod 6 made of a synthetic resin molded body is inserted through the valve hole 13. The valve rod 6 has a head portion 61 continuously provided on the upper portion thereof, and the head portion 61 is inserted into the recessed portion 48 of the large diameter portion 42. The head portion 61 has an upper end surface serving as a receiving portion 62 corresponding to the hitting portion 49, and a lower end stepped portion serving as an engaging portion 63 corresponding to the claw portion 51. It is held so as to be displaceable in the axial direction X between the portion 49 and the claw portion 51. Further, the valve rod 6 has a communication passage 64 that always communicates the internal space 1a of the housing 1 with the internal passage of the connection port portion 15, and the valve rod corresponding to the valve seat 14 is provided at the lower end portion thereof. It has a part 65. Further, the valve rod 6 is held by a valve rod holder 7 which is provided so as to overlap the bottom wall portion 12 of the housing 1. That is, the valve rod holder 7 is made of rubber or soft synthetic resin, and the valve 71 is provided with frictional resistance when the hole 71 provided in the center of the valve rod holder 7 contacts the outer peripheral surface of the valve rod 6. When the valve rod 6 receives a force in the axial direction X, it has a property of allowing the valve rod 6 to slide due to the force. As well shown in FIG. 5, notches 72 are provided at predetermined positions in the hole 71 of the valve rod holder 7, and the notches 72 ... Are provided between the valve hole 13 and the housing 1. It is in continuous communication with the internal space 1a.

A spring body 8 made of a coil spring is interposed between the valve rod holding body 7 and the large diameter portion 42 of the stem 4, and the spring force of the spring body 8 causes the stem 4 to move to the initial position. It is always urged upward.

In the valve A configured as described above, in the normal state, the claw portion 51 of the stem 4 engages with the engaging portion 63 of the head portion 61 to move the head portion 61 to the spring body 8 as shown in FIG. Since it is pulled up by the spring force, the valve portion 65 of the valve rod 6 contacts the valve seat 14 to close the valve hole 13. In this state, the upper limit position of the stem 4 is fixed. The fixed position at this time is the initial position of the stem 4 shown in FIG.

In the normal state where the stem 4 is located at the initial position, the stem hole 44 is sealed by the hole portion 21 of the gasket 2 as shown in FIG. When the stem 4 is pushed by a finger and is pushed in from the initial position as shown by arrows P1 and P2 in FIGS. 3 and 4, the gasket 2 is flexibly deformed as the stem 4 is pushed. In both cases of FIG. 3 and FIG. 4, the stem hole 44 is opened.

FIG. 3 shows the state of the first stage in which the stem 4 is pushed to the position where the contact portion 49 on the stem 4 side hits the receiving portion 62 on the valve rod 6 side, and the pushing amount at that time is shown. It is represented by reference numeral S1. In the first step in which the pushing amount of the stem 4 from the initial position is within the range of S1, the stem hole 44 is open, and moreover, the stem hole 44 passes through the passage formed by the internal space 1a of the housing 1. Since it is communicated with the communication passage 64 of the valve rod 6 through the dip tube 3 by receiving the pressure of the gas in which the liquid content L contained in the container B shown in FIG. As shown by arrow a in FIG. 3, after passing through only the communication passage 64 and entering the internal space 1a of the housing 1, it flows out through the stem hole 44 as shown by arrow b. It is sprayed from the spray nozzle 45 of FIG.

FIG. 4 shows the state of the second stage in which the contact portion 49 on the side of the stem 4 is further pushed in after hitting the receiving portion 62 on the side of the valve rod 6, and the state from the initial position at that time is shown. The indentation amount is represented by symbol S2. In the second stage, the valve rod 6 is also pushed down together with the stem 4 as indicated by arrow P3 against the frictional resistance with the valve rod holder 7, so that the valve portion 65 is separated from the valve seat 14 and the valve hole 13 is formed. open. In this second stage, since both the communication passage 64 and the valve hole 13 communicate with the internal space 1a of the housing 1, the liquid content L of the container B shown in FIG. 1 rises in the dip tube 3. After that, as shown by the arrows a and c, it passes through the communication passage 64, the valve hole 13 and the cutout portion 72 of the valve rod holding body 7, enters the internal space 1a of the housing 1, and further passes through the stem hole 44. It flows out like the mark b and is sprayed from the spray nozzle 45 of FIG. In the second stage, the amount of the liquid content L flowing out through the stem hole 44 becomes larger than in the case of the first stage described above.

When the finger is released from the stem 4 to release the pushing force, the stem 4 is returned to the initial position by the spring force of the spring body 8, so that the gasket 2 returns to its original shape and the stem hole 44 is closed. Further, the valve rod 6 is pulled up as the stem 4 returns to the initial position, and the valve portion 65 abuts the valve seat 14 to close the valve hole 14.

In the valve A described above, the distance S between the contact portion 49 and the receiving portion 62 when the stem 4 is located at the initial position (see FIG. 2: push amount S 1 shown in FIG. 3) Is narrowed down), the pushing amount S1 of the stem 4 required for the transition from the first stage to the second stage can be made small, and at the same time, the valve A can be downsized (the axial length can be shortened). Planned. On the contrary, if the interval S is widened, the pushing amount S1 of the stem 4 required for the transition from the first stage to the second stage becomes large.

In the valve A of the embodiment described above, by connecting the dip tube 3 to the connection port portion 15 provided in the housing 1, it is possible to spray the liquid content L with the container B in the standing posture. However, when the content is a high-pressure gas, the same action can be achieved even if the dip tube 3 and the connection port 15 are omitted. The device in which the dip tube 3 and the connection port 15 are omitted is included in the invention according to claim 1.

Further, in the above-mentioned embodiment, although the valve rod holder 7 made of rubber or flexible synthetic resin is used, the valve rod holder 7 is as shown in FIG. When a disc material 73 having a large number of thin linear portions 74 having elasticity in the inner peripheral portion is arranged on the bottom wall portion 12 of the housing 1 and the linear portions 74 are elastically contacted with the valve rod 6, The valve rod 6 may be held by a frictional resistance. In this case, the contents pass through the gap passages between the many linear portions 74.

FIG. 7 is a sectional view of a spray amount control valve A which is an embodiment of the invention according to claim 3. In this valve A, the push-down contact part 49 of the stem 4 is divided into two types in the circumferential direction, an upper contact part 49a and a lower contact part 49b having a step in the axial direction of the stem 4. There is. Further, the head portion 61 of the valve rod 6 is provided with a receiving portion 62 only in its half circumferential portion, and the other half circumferential portion is recessed in a stepped shape. By doing so, every time the stem 4 is rotated 180 degrees about the axis as indicated by the arrow R, the upper contact portion 49a and the lower contact portion 49b are alternately opposed to the receiving portion 62. Then, when the upper contact portion 49a is opposed to the receiving portion 62 and the stem 4 is pushed in, the action in the first stage and the action in the second stage described above are performed. When a gap is formed between the lower contact portion 49b and the receiving portion 62 when the lower contact portion 49b is opposed to the receiving portion 62, the operation of the first step and the second step described above by pushing the stem 4 is performed. Even if the action is performed, when the two are in contact with each other in an overlapping manner, the pushing of the stem 4 causes only the action at the second stage and not the action at the first stage. As shown in FIG. 8, in this embodiment, the valve rod 6 is provided with a key portion 66, and the key portion 66 is engaged with the vertical groove 16 formed in the connection port portion 15. This prevents the valve rod 6 from rotating together with the stem 4 when the stem 4 is rotated. In this embodiment, other matters are the same as those described in FIGS.

In FIGS. 1 to 8, the same or corresponding parts are designated by the same reference numerals to avoid duplication of description.

[0035]

[Effect of device]

 According to the invention of claim 1, the amount of spray can be increased / decreased in two steps, and the amount of pushing of the stem required for a large amount of spray can be arbitrarily set to a desired amount. Therefore, the usability of the valve can be easily improved, and the valve can be downsized. Further, there is also an effect that the switching between the first-stage small amount spraying and the second-stage large amount spraying can be reliably performed by the contact and separation of the valve body with respect to the valve seat.

According to the second aspect of the invention, even if the content of the container is liquid, there is an effect that it is possible to increase or decrease the spray amount in two steps with the container standing up.

According to the third aspect of the present invention, the user rotates the stem about the axis by a predetermined angle, so that the pushing amount of the stem required for the first stage small amount spray and the second stage large amount spray is required. Will be able to be adjusted accordingly. It also becomes possible to perform only the large amount of fog in the second stage.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a container equipped with a spray amount adjusting valve according to an embodiment of the invention according to claim 2.

FIG. 2 is a cross-sectional view showing the structure of the valve when the stem is located at the initial position.

FIG. 3 is a cross-sectional view showing the structure of the valve at the first stage.

FIG. 4 is a cross-sectional view showing the structure of the valve at the second stage.

5 is a cross-sectional view taken along the line VV of FIG.

FIG. 6 is a cross-sectional view showing a main part of the valve equipped with a valve rod holder according to a modification.

FIG. 7 is a cross-sectional view of a spray amount control valve which is an embodiment of the invention according to claim 3.

8 is a cross-sectional view taken along the line VII-VII of FIG.

FIG. 9 is a sectional view of a main part of a conventional example.

[Explanation of symbols]

 A Spray amount control valve B Container L Liquid contents (contents) 1 Housing 1a Inner space of housing 2 Gasket 3 Dip tube 4 Stem 6 Valve rod 7 Valve rod holder 11 Upper end of housing 13 Valve hole 14 Valve seat 15 Connection Mouth portion 21 Hole portion 44 Stem hole 49 Pushing down contact portion 49a Upper contact portion 49b Lower contact portion 51 Lifting claw portion 61 Head portion 62 Receiving portion 63 Engaging portion 64 Communication passage 65 Valve portion X axial direction

Claims (3)

[Scope of utility model registration request] 1. A housing having an internal space serving as a passage for contents contained in a container is provided with a valve hole for introducing the contents into the internal space and a valve seat around the valve hole. A gasket having a hole is held at an upper end of the housing, and a stem inserted through the hole is loosely fitted in the housing so as to be axially displaceable. An opening between the stem and the stem is sealed, and the stem is sealed by the gasket when the stem is in the initial position, and when the stem is pushed in the axial direction from the initial position. A stem hole opened by the flexural deformation of the gasket, a push-down contact portion, and a pull-up claw portion facing each other at a position spaced apart in the axial direction are provided at the contact portion. The valve rod inserted through the valve hole has a receiving portion corresponding to the contact portion and an engaging portion corresponding to the pawl portion, and is displaceable between the contact portion and the pawl portion. A head portion held by the stem is continuously provided, and a valve rod holding body for holding the valve rod by frictional resistance is interposed between the valve rod and the housing. When the contact portion hits the receiving portion and pushes down the valve rod by the pushing operation during the operation of the stem, the stem is located at the initial position and the stem is located at the initial position, and the stem is located at the initial position. Is in communication with the internal space of the housing at all times during the normal state and operation of the stem and the valve portion that closes the valve hole by hitting the valve seat while pulling up the valve rod through the engaging portion. And a communication passage for , Spray amount adjusting valve, characterized in that it is resiliently urged toward the normally initial position by the spring force. 2. A housing is provided with a connection opening portion for accommodating the valve portion in a loosely fitted manner and communicating with the valve hole and a communication passage of the valve rod, and the connection opening portion is accommodated in a container. The spray amount adjusting valve according to claim 1, wherein a dip tube immersed in the liquid content is connected. 3. The push-down contact part of the stem is divided into two types of contact parts, an upper contact part and a lower contact part having a step in the axial direction of the stem in the circumferential direction thereof. 3. By rotating the shaft about an axis, the two types of the contact portions can be selectively opposed to the receiving portion of the head portion to which the valve rod is continuously provided. The spray amount control valve described.