JPH0523351A - Fluid control valve apparatus for dental handpiece - Google Patents

Abstract

PURPOSE:To improve durability and reliability with a simple construction while enabling fine adjustment of a flow rate or the like of a fluid by making a closure member slide along a first valve seat with the rotation of a manual operation ring to limit the flow of a working fluid. CONSTITUTION:A valve body 12 is provided with a small-diameter bore 18 having a dynamic line parallel with a axis line 16 at a thick part thereof to house a closure member 20 free to slide. A small-diameter bore 18 has a function as first valve seat to the closure member 20. The small-diameter bore 18 is made to communicate with a second valve seat 22 and the latter is penetrated into a fluid outlet 24. A fluid inlet 26 within the valve body 12 is opened radially in the small-diameter bore 18. These parts make up an internal fluid path 28 of a control valve apparatus 10. An operation ring 30 is mounted rotatably on the outer circumference of the valve body 12 centered on the axis line 16. Thus, the closure member 20 is displaced parallel with the axis line 16 by turning the operation ring 30 manually to control a flow rate of a working fluid for dentistry flowing through the fluid path 28.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a control device for controlling the flow (flow rate and / or pressure) of a dental working fluid supplied to a dental handpiece.

[0002]

[Object of the Invention]

2. Description of the Related Art As a powered dental handpiece,
Turbine handpieces, air motor handpieces, power-type scalers (tartar removal devices), power-type root canal treatment handpieces, and the like are known.

The dental turbine handpiece is intended for cutting teeth at an extremely high speed and has a built-in air turbine operated by compressed air. On the other hand, the dental air motor handpiece is intended to cut and grind teeth at a relatively low speed rotation, and has, for example, a vane motor that operates with compressed air. The power scaler and power root canal treatment handpiece are intended to remove tartar and punch a root canal by vibrating the tool, and incorporates a vibration generator that operates with compressed air. is doing.

On the one hand, such a powered dental handpiece requires the supply of compressed air as a power source, and on the other hand, it cools the site to be treated and the working tool, and the site to be treated. Requires the supply of pressurized water to wash and wash away debris. These dental working fluids (eg, compressed air and pressurized water) are typically supplied to the handpiece via a flexible hose from a dental unit installed in a dental clinic. A joint, called a joint or coupling, selectively allows multiple handpieces to be attached to a hose to allow the use of the appropriate type of handpiece depending on the progress of the dental procedure. Ready to connect.

The pressure of the compressed air supplied from the dental unit to the handpiece is basically set by the pressure regulator of the air compressor of the dental unit. The set value of the pressure regulator can theoretically be increased or decreased as needed.
However, it is troublesome to adjust each time, so it is common to set it to an appropriate fixed value.

In the dental treatment, it is desirable that the rotation frequency and the vibration frequency of the handpiece can be variably controlled at the handpiece according to the dentist's intention according to the treatment condition. Therefore, it is desired that the pressure and flow rate of the compressed air can be variably controlled at the hand of the handpiece.

On the other hand, as the pressurized water supplied to the handpiece, the water supply is usually used as it is. The water pressure of the water supply is not controllable by the dentist at all and may change depending on the time of day, so it is desirable that the water pressure can be adjusted on the handpiece side.

Also, in a handpiece for injecting compressed air and water and a mixture thereof, such as a dental three-way syringe, similarly, there is a desire to adjust the pressure and flow rate of the compressed air and water to be ejected. There is.

In order to meet such demands, it is necessary to incorporate or connect a fluid control device capable of controlling the flow rate and pressure of a dental working fluid such as compressed air or pressure water into a handpiece. is there.

The installation position of the fluid control device in the power type handpiece inevitably depends on the intake of compressed air (located at the rear end of the handpiece) and its consuming device (eg, air turbine, air motor, power type). Is a vibration generator,
(Generally located at the center of the handpiece).

However, as will be described later with reference to the drawings, a male member of a coupling for connecting a hose from the dental unit is generally provided in the handpiece section behind the air turbine or the like (dental unit side). Due to the formation of the axial bore for receiving, the fluid control device can be placed in a thin cylindrical wall between the axial bore and the outer contour of the handpiece. Various structures and dimensions are required.

As will be described later with reference to the drawings, as a flow rate control mechanism for a conventional dental handpiece, a structure for controlling the flow rate of water by constricting a flexible water pipe by a rotating ring with a cam is used. It has been known. This structure is simple, but lacks durability and reliability. Also,
Crushing the water pipe limits the flow of water and is not suitable for fine-tuning the flow rate.

In the handpiece disclosed in Japanese Utility Model Publication No. 60-33938, a control disk having a displaceable opening between the inlet port and the exhaust port of the vane motor is provided, and the control disk is rotated. As a result, the motor is switched between forward and reverse and the flow rate of compressed air is controlled. This structure has the drawback that it requires a large installation size and that the hermetic sealing between the rotating disk and the adjacent member is extremely difficult.

[0014]

SUMMARY OF THE INVENTION In one aspect of the present invention, it is an object of the invention to provide a dental handpiece in a section having an axial bore formed therein for receiving a male member of a coupling. PROBLEM TO BE SOLVED: To provide a working fluid control valve device for a dental handpiece, which can be arranged within a limited radial dimension (radial wall thickness) between the axial bore and an outer contour of the handpiece. is there.

In another aspect of the invention, it is an object of the invention to be able to fine tune the flow rate (and / or pressure) of the dental working fluid, and thus the rotational speed and frequency of the handpiece. It is an object of the present invention to provide a fluid control valve device for a dental handpiece capable of delicately controlling.

In still another aspect of the present invention, it is an object of the present invention to provide a working fluid control valve device for a dental handpiece which has a simple structure, is easy to manufacture and assemble, and has excellent durability and reliability. To provide.

In another aspect of the present invention, it is an object of the present invention to provide a fluid control valve device for a dental handpiece that can be operated by a dentist at his / her hand.

[0018]

[Constitution of the invention]

SUMMARY OF THE INVENTION In one aspect of the invention, a fluid control valve device of the invention for controlling the flow of dental working fluid supplied to a dental handpiece has an axial cavity. A generally cylindrical valve body and an internal fluid passageway formed in the valve body having a fluid inlet and a fluid outlet,
A first valve seat formed in the valve body across the fluid passage and parallel to the axis of the valve body, and slidably supported by the valve body along the first valve seat parallel to the axis of the valve body, the fluid passage A movable closing member that variably controls the flow of working fluid through the first valve seat in cooperation with the first valve seat, a manually operated ring rotatably mounted on the valve body about the axis of the valve body, and the rotation of this operation ring Motion conversion means for converting motion into translational motion of the closure member parallel to the valve body axis.

When the manually operated ring is rotated, the closing member slides along the first valve seat and changes the effective sectional area of the fluid passage, so that the flow of the working fluid is controlled.

Since the fluid passage, the first valve seat and the closing member are arranged between the axial cavity of the valve body and the outer contour of the valve body, a male member of the coupling is provided in the center of the valve body. An axial cavity can be secured for insertion.

Since the closing member is displaced in the axial direction by the rotational movement of the operating ring about the axis of the valve body, the flow rate can be easily fine-tuned, and the rotational frequency and frequency of the handpiece are delicate. Can be controlled.

In a preferred embodiment of the invention, the closure member is cylindrical with an axis parallel to the axis of the valve body and the first valve seat is coaxial with the closure member and slidably supports the closure member. It has a cylindrical sliding surface and the fluid inlet opens radially to this cylindrical sliding surface.

As described above, if the first valve seat and the closing member are formed in a cylindrical shape, they can be easily machined and can be manufactured at low cost and easily assembled.

In another preferred embodiment of the invention,
An O-ring can be attached to the outer circumference of the closing member.
This O-ring acts as a fluid seal between the closing member and the cylindrical sliding surface of the first valve seat, and also as a detent for the cylindrical closing member, so that the structure is very simple.

According to another feature of the invention, the valve body has an annular second valve formed transverse to the fluid passageway and downstream of the first valve seat and coaxially with the cylindrical sliding surface of the first valve seat. A seat is further provided, and by engaging the tip of the cylindrical closing member with the second valve seat, the stroke of the closing member is regulated and the flow of the dental working fluid is blocked. According to this structure, when the tip of the closing member engages with the second valve seat, the operating ring cannot be rotated any more, and the user feels the operating ring so that the closing member is completely closed. You can sense that you have reached. Also, the fluid is completely blocked in the closed position.

In another embodiment of the present invention, the closing member has an axial extension, and the motion converting mechanism is formed on an inner thread formed on an inner circumference of the rotating ring and an extension of the closing member. And an external thread that meshes with the internal thread of the rotary ring. By sufficiently reducing the pitch of these screws, a large angular displacement of the rotating ring can be converted into a minute translational movement of the closing member, and the flow of the working fluid can be finely adjusted.

In another aspect of the invention, the invention comprises:
A dental handpiece having an axial cavity extending along the axis of the handpiece in at least a portion of the length of the handpiece and requiring the supply of at least one dental working fluid. A fluid control valve device for controlling the flow of a working fluid is provided, wherein the fluid control valve device is radially outwardly offset from the axial cavity in the section of the handpiece to provide a meat portion of the handpiece. A dental working fluid passage having a portion formed therein, a valve element for variably controlling the flow of working fluid through the fluid passage by displacing it in parallel with the axis of the handpiece, and the axis in the section of the handpiece. A manual operation ring mounted on the outer periphery of the handpiece so that it can rotate around the Motion conversion mechanism for converting the translational movement, consisting includes a city.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to the accompanying drawings showing the embodiments of the present invention.

1 to 5 show a simplest embodiment of a fluid control valve device for a dental handpiece according to the present invention, which is configured as a device independent of the handpiece. Yes, and is configured to be used by connecting to a dental handpiece as needed.

To explain the basic structure and principle of the fluid control valve device of the present invention with reference to FIGS. 1 to 5, the control valve device 10 includes a valve body 12 having a substantially cylindrical shape.
Formed therein is an axial through bore 14 for receiving a male member (described below with reference to FIG. 7) of the coupling connecting the hose from the dental unit.

The valve body 12 is provided with a small-diameter bore 18 having an axis parallel to the axis 16 of the main body 12 at a meat portion between the through-bore 14 and the outer contour thereof. A substantially cylindrical closing member 20 is slidably accommodated in the. The small-diameter bore 18 functions as a first valve seat for the closing member 20, and has a cylindrical sliding surface.

The small diameter bore 18 is a conical truncated second valve seat 22.
, Which in turn communicates with the fluid outlet 24.
A fluid inlet 26 is further bored in the meat portion of the valve body 12, and the inlet 26 is opened to the small diameter bore 18 in the radial direction. The fluid inlet 26, the portion of the small diameter bore 18, and the fluid outlet 24 are connected to the internal fluid passage 2 of the control valve device 10.
Make up 8.

As shown in FIG. 1, an operating ring 30 is mounted on the outer periphery of the valve body 12 so as to be rotatable about an axis 16. By rotating the operating ring 30 by hand, the closing member 20 is axially moved. It is displaced parallel to 16 (see FIGS. 4 and 5) and controls the flow rate of the dental working fluid through the fluid passage 28. In the illustrated embodiment, the actuation ring 30 has a cylindrical guide surface 34 that engages a cylindrical support surface 32 having a diameter less than the maximum outer diameter of the valve body 12 for rotating the actuation ring 30. The support surface 32 and the guide surface 34 position the operating ring 30 in the radial direction. The axial positioning of the operating ring 30 is performed by an annular support surface 36 formed in the valve body 12 in the radial direction and a stopper ring 38 screwed into a small-diameter threaded portion 37 of the valve body 12.

As best seen in FIGS. 1 and 2, the valve body 12 is machined with a cylindrical surface 40 having a smaller diameter than the cylindrical support surface 32. As can be seen from FIG. 2, the cylindrical surface 40 slightly intersects the contour of the small-diameter bore 18, so that the right end of the small-diameter bore 18 in the drawing is open to the surface 40. On the other hand, as shown in FIGS. 1 and 2, the closing member 20 includes a head portion 42 and an extension portion 44, and the extension portion 44 is formed with an external thread having a small pitch. An inner screw 46 formed on the inner circumference of the operation ring 30 meshes with the outer screw portion 44. This meshing is such that the cylindrical surface 40 slightly intersects the contour of the small diameter bore 18, so that a portion of the external thread 44 of the closure member 20 fitted within the small diameter bore 18 is radially outward from the cylindrical surface 40. It is possible by slightly protruding it. As can be seen from the lower half of FIG. 1 and FIG. 3, the inner diameter of the inner screw 46 does not interfere with the cylindrical surface 40, but
And the outer screw 44 are selected so that they fully engage.
The inner thread 46 of the operating ring 30 and the outer thread 44 of the extension of the closing member 20 constitute a movement converting means 48 for converting the rotational movement of the operating ring 30 into the translational movement of the closing member 20. Therefore, it can be understood that when the operation ring 30 is rotated, the closing member 20 is axially advanced and retracted in the small diameter bore 18 to open and close the fluid passage 28. Screws 44, 46
The pitch of can be appropriately determined. The smaller the pitch, the smaller the axial displacement of the closing member 20 with respect to the predetermined angular displacement of the operating ring 30, and thus the flow of the working fluid can be finely adjusted.

As can be seen from FIGS. 1 and 2, an O-ring 50 is fitted in the groove between the head portion 42 and the extension portion 44 of the closing member 20. The diameter of the O-ring 50 is chosen to be slightly larger than the diameter of the small diameter bore 18.
This O-ring 50 has two functions. First, FIG.
When the closure member 20 is inserted into the bore 18 as shown in FIG. 5, the O-ring 50 acts as a seal, preventing the working fluid from leaking out of the fluid passage 28. Second, the O-ring 50 acts as a detent for the closure member 20 and prevents the closure member 20 from rotating about its axis when rotating the operating ring 30.

FIG. 1 shows a fully closed position of the fluid control valve device 10. In this position, the fluid inlet 26 is closed by the closing member 20 and the tip of the closing member 20 is in contact with the second valve seat 22, so that the fluid flow is completely shut off. Further, since the end of the closing member 20 abuts on the second valve seat 22, the stroke of the closing member 20 is restricted, so that the operation ring 30 cannot be further rotated in the closing direction.

FIG. 4 shows the half-open position of the fluid control valve device 10. FIG. 5 shows the fully open position of the fluid control valve device 10.
In this position, the end surface of the extension portion 44 of the closing member 20 abuts the end surface of the stopper ring 38 and regulates the stroke of the closing member 20.

In the above description, the closing member 20 and its valve seat 18 are cylindrical. With such a shape, machining of them can be extremely facilitated. Further, when the control valve device is assembled, the closing member 20
Since the closing member 20 may be simply inserted into the bore 18 of the valve body 12 and the operation ring 30 may be screwed into the valve body 12 without considering the direction around the axis, the assembly is extremely simple. However, in order to achieve the main object of the present invention, it is not essential that the closing member and its valve seat have a cylindrical shape, and a sliding valve structure composed of a flat valve seat and a plate-like closing member is adopted. You can also

FIGS. 6-9 show the fluid control valve device of the present invention incorporated into a powered dental scaler. Components having the same functions as the components shown in FIGS. 1 to 5 are denoted by the same reference numerals, and the description thereof will be omitted as long as it overlaps with the above description. In order to facilitate comparison between the fluid control valve device of the present invention and the control valve device of the prior art, FIGS. 6 to 9 show that the control valve device of the prior art is incorporated at the same time.

First, referring to FIG. 6, the dental scaler 100 is composed of a handle section 102, a flow rate controlling / coupling section 104, and a scaler tip 106 as a dental working tool.

Next, referring to FIG. 7, the handle section 1
02 has sleeves 110 and 112 connected to each other by a threaded joint 108, the handle section 102
A compressed air actuated vibration generator 114 is housed inside. This vibration generating device 114 is substantially the same as that described in the applicant's US Pat. No. 4,453,919, and a vibrator (not shown) vibrates and is generated by the supply of compressed air. The vibration is transmitted to the scaler tip 106 via the vibration transmission rod 116, and is configured to remove tartar.

As shown in FIG. 7, in the flow rate control / coupling section 104, the valve body 12 of the control valve device 10 of the present invention described above with reference to FIGS. It is connected to the sleeve 112 by 118.
In the embodiment shown in FIG. 7, the axial through bore 14 of the valve body 12 has a stepped shape to receive the male member 122 of the coupling half 120 of an existing hose coupling. The male member 122 of the coupling has a pair of O-rings 12 on both sides of the compressed air supply port 124.
6 is provided, and a pair of O-rings 130 are provided on both sides of the water supply port 128 so that the O-rings engage the chamfered portions 132 and 134 of the stepped bore 14, respectively. The valve body 12 also acts as the other half of the hose coupling, and by inserting the male member 122 of the coupling half 120 into the axial through bore 14, the dental scaler 100 and the hose 1 are inserted.
Coupling with 36 is realized.

Hose 1 from a dental unit (not shown)
Compressed air supplied via 36 is compressed air supply port 124 of male member 122 and compressed air inlet 26 of valve body 12.
(In this embodiment, this inlet is formed in a crescent shape as shown in FIG. 8), the compressed air outlet 2 of the valve body 12
4, the axial passage 138 of the valve body, the axial pipe 140,
And, it enters the annular air-filled chamber 146 via the axial passage 144 of the inner block 142, and from there, through the gap 150 between the outer periphery of the housing 148 of the vibration generator 114 and the inner periphery of the inner block 142. , The vibration generator 114 via a plurality of compressed air intakes 152 (only three are shown in FIG. 7) of the housing 148.
Is supplied to.

The flow of compressed air through these compressed air passages is controlled by the displacement of the closing member 20 as the operating ring 30 rotates, as described above with reference to FIGS. 1 to 5. , I don't need explanation again. By variably controlling the flow rate and / or the pressure of the compressed air, the frequency and amplitude of the vibration generated in the vibration generator 114 and transmitted to the scaler chip 106 are increased or decreased. Therefore, the user can adjust the flow rate / pressure of the compressed air so as to obtain the optimum vibration frequency and amplitude for the conditions of the scaling treatment. 6 and 7 show an embodiment in which the control valve device of the present invention is incorporated in a power-type scaler for removing tartar by vibration.
Similarly, the control valve device of the present invention can be incorporated in a turbine handpiece and an air motor handpiece as a subassembly to control the rotational speeds of the turbine and the air motor. Further, the present invention can be applied to known power-operated root canal treatment handpieces and dental three-way syringes.

As described above, in the dental power scaler shown in FIGS. 6 to 9, the fluid control valve device 10 of the present invention is used.
In addition, a conventional control valve device is incorporated. In this embodiment, the conventional control valve device controls the flow rate of the cleaning cooling water. That is, referring mainly to FIG. 7, the cleaning cooling water supplied from the water supply port 128 of the coupling half 120 via the hose 136 is flexible via the crescent-shaped water inlet 154 (see FIG. 8). It is introduced into the water pipe 156, and is sent to the central bore 164 via the metal pipe 158, the axial passage 160, and the radial passage 162. The pressure water in the central bore 164 penetrates the vibration generator 114 into the water pipe 16.
6 is guided to the passage 168 in the vibration transmission rod 116, and is ejected from the nozzle 172 of the scaler tip via the passage 170 in the scaler tip 106 connected to the rod 116 by the screw joint.

The flow rate of the wash cooling water is adjusted by a flow rate adjusting ring 174 rotatably mounted on the valve body 12. The inner circumference of the adjusting ring 174 is radially inward as shown in FIG. A cam 176 protruding in the direction is provided, and when the cam 176 rides on the steel ball 178, the flexible pipe 156 is narrowed and the flow rate is reduced. Since the flexible pipe 156 is made of plastic such as soft polyvinyl chloride, this conventional flow rate adjusting mechanism has a simple structure, but is not sufficiently durable and reliable. Further, since the flow rate is adjusted by narrowing the flexible pipe 156, it is not suitable for fine adjustment of the flow rate.

On the other hand, the control valve device 10 of the present invention
Has the advantage that the flow rate and / or pressure of the dental working fluid can be finely adjusted, and that it is excellent in durability and reliability.

FIG. 7 shows a case where the control valve device 10 of the present invention and the conventional flow rate adjusting mechanism 174/178 are used together, but the control valve device of the present invention is used instead of the conventional flow rate adjusting mechanism. It is also possible to use 10 and provide the control valve device 10 of the present invention in a two-stage type. It is also possible in that case to arrange such that one operating ring 30 actuates the two closure members 20.

[0049]

As can be seen from the above description, the present invention provides a limited radial dimension between the axial bore 14 for fitting the male member 122 of the hose coupling and the outer contour of the handpiece. It is possible to arrange the fluid control valve device 10 therein.

In another aspect, the present invention enables the flow of dental working fluid to be regulated with greater accuracy than conventional devices. Therefore, it becomes possible to delicately control the rotation speed and the vibration frequency of the handpiece.

In still another aspect, the fluid control valve device of the present invention has a simple structure, is easy to manufacture and assemble,
Excellent in durability and reliability.

[Brief description of drawings]

FIG. 1 is an axial cross-sectional view of a first embodiment of a fluid control valve device of the present invention, showing a closure member in a fully closed position.

FIG. 2 is an exploded perspective view of the control valve device shown in FIG. 1, showing a state where an operation ring and a stopper ring are removed.

FIG. 3 is a cross-sectional view taken along the line III-III in FIG.

FIG. 4 is a cross-sectional view similar to FIG. 1 showing the closure member in the half open position.

FIG. 5 is a sectional view similar to FIG. 1, showing the closure member in the fully open position.

FIG. 6 is a side view of a dental power scaler equipped with the fluid control valve device of the present invention.

7 is a cross-sectional view of the scaler shown in FIG.
The scaler is divided and shown due to the length limitation of the drawing. The half of the hose coupling is also shown.

8 is a sectional view taken along the line VIII-VIII in FIG. 7.

9 is a sectional view taken along line IX-IX in FIG.

[Explanation of symbols]

10: Fluid control valve device 12: valve body 14: Axial cavity 18: First valve seat 20: Closing member 22: Second valve seat 24: Fluid outlet 26: Fluid inlet 28: Fluid passage 30: Operation ring 44/46: Motion conversion means 50: O-ring for closing member 48: Motion conversion means 100: Dental handpiece

Claims (6)

[Claims] 1. A fluid control valve device for controlling the flow of a dental working fluid supplied to a dental handpiece: a substantially cylindrical valve body having an axial cavity, formed in the valve body. An internal fluid passage having a fluid inlet and a fluid outlet, a first valve seat formed in the valve body across the fluid passage and parallel to the axis of the valve body, and parallel to the axis of the valve body. A closing member movably supported by the valve body along the first valve seat, the variable closing member controlling the flow of working fluid through the fluid passage in cooperation with the first valve seat. A manual operation ring mounted on the valve body so as to be rotatable about the axis of the valve body, and a motion conversion for converting rotational movement of the operation ring into translational movement of the closing member parallel to the axis of the valve body. Means, and said manual operation A fluid control valve device for a dental handpiece, wherein a flow of a working fluid is controlled by sliding a closing member along a first valve seat with rotation of a ring. 2. The closing member has a cylindrical shape having an axis parallel to the axis of the valve body, and the first valve seat has a cylindrical sliding shape coaxial with the closing member and slidably supporting the closing member. 2. The fluid control valve device according to claim 1, wherein the fluid control valve device has a surface, and the fluid inlet is radially open to the cylindrical sliding surface. 3. The closure member has an axial extension, and the motion converting mechanism includes an inner thread formed on an inner circumference of the rotating ring and the rotation ring formed on the extension of the closing member. The fluid control valve device according to claim 2, wherein the fluid control valve device is configured with an outer screw that meshes with an inner screw. 4. An O-ring is mounted on the outer periphery of the closing member, the O-ring acting as a fluid seal between the closing member and the cylindrical sliding surface of the first valve seat, as well as the cylindrical shape. A fluid control valve device according to claim 3, wherein the fluid control valve device acts as a detent for the closing member. 5. The valve body further comprises an annular second valve seat formed across the fluid passage downstream of the first valve seat and coaxially with a cylindrical sliding surface of the first valve seat, 3. The fluid control according to claim 2, wherein the end of the columnar closing member engages with the second valve seat to restrict the stroke of the closing member and block the flow of the dental working fluid. Valve device. 6. Dental implant having an axial cavity extending along the axis of the handpiece in at least a section of the length of the handpiece and requiring the supply of at least one dental working fluid. A fluid control valve device for controlling the flow of the dental working fluid in a handpiece, comprising:
In the section of the handpiece, the dental working fluid passage having a portion formed in the meat portion of the handpiece by being offset radially outward from the axial cavity, and by displacing in parallel to the axis of the handpiece, A valve element for variably controlling the flow of a working fluid through a fluid passage, a manual operation ring mounted on the outer periphery of the handpiece so as to be rotatable around the axis in the section of the handpiece, and a rotation of the operation ring. A motion conversion mechanism that converts motion into translational motion of the valve element parallel to the handpiece axis;
And a flow control valve device for a dental handpiece, wherein the flow of the working fluid is variably controlled by rotating the manually operated ring.