JP5119358B2 - Motorized valve and position setting method of fixed stopper piece in motorized valve - Google Patents

Description

  The present invention relates to an air conditioner, a motorized valve used in a refrigeration cycle of a refrigeration apparatus, and a fixed stopper piece position setting method in the motorized valve.

  Conventionally, a motor-operated valve incorporated and used in this type of air conditioner, refrigerator, or the like is disclosed in Patent Document 1 below as a conventionally known motor-operated valve.

  This known motor-operated valve will be described as follows. FIG. 15 is a longitudinal sectional view of the known motor-operated valve 10. The rotation of the stepping motor is converted into a linear motion by a screw mechanism, and the needle valve body 33 is moved in the axial direction so that the valve of the needle valve body 33 is shown. In the motor-operated valve 10 that quantitatively controls the refrigerant flow rate according to the amount of movement in the lift direction, the motor-operated control valve that can determine the base phase and the reverse phase by setting the base position of the rotor 40 with high reproducibility and high accuracy. The valve seat plate 18 is integrally formed with a base point setting stopper piece 23 erected on the rotor 40 side, and the rotor 40 is brought into contact with the base point setting stopper piece 23 by axial movement accompanying the rotation of the rotor 40. An invention is described in which a base point setting stopper surface portion 52 for setting a base point position, which is the maximum rotational position of the rotor 40 in the valve closing direction, is provided.

JP 2002-147900 A

  However, the known motor-operated valve shown in FIG. 15 can set the base point position, which is the maximum rotation position in the valve closing direction of the rotor, but the distance (lift amount) between the valve body and the valve seat can be set for each component. In response to the desire to set accurately regardless of the dimensional accuracy, it is performed by a method such as setting while measuring the air flow rate, and there is a problem that the process becomes complicated.

  The present invention has been invented to solve such a problem, and the object of the present invention is to provide a motor-operated valve in which the valve body is closed between the valve seat and the valve body in the closed state, leaving the lift amount. An electric valve that can accurately determine the setting position of the fixed stopper for setting the maximum rotation position of the motor regardless of the dimensional accuracy of each component, or a setting method thereof. This setting method simplifies the fixed stopper position setting process.

As means for solving the above problems, the present invention employs the following means.
The motor-operated valve according to claim 1 is provided with a rotor-side stopper portion 8b in the rotor 8 that opens and closes the valve body 7 by the solenoid portion 10, and an intermediate stopper body 6 that is rotatably supported around the valve body 7 is disposed. In addition, a fixed stopper piece 2a is provided on a member integral with the valve seat 3, and the intermediate stopper body 6 is engageable with the arm portion 6b engageable with the rotor side stopper portion 8b and the fixed stopper piece 2a. And the fixed stopper piece 2a is arranged so as to be movable and fixed in the circumferential direction of the integral member.

  According to a second aspect of the present invention, there is provided the motor-operated valve according to the first aspect, wherein the integral member is a flat base plate 1 that supports the valve seat 3, and the base plate 1 has a stopper sliding groove in its circumferential direction. 1c is formed, the fixed stopper piece 2a is slidably fixed along the stopper sliding groove 1c, and the intermediate stopper body 6 holds the valve body 7 fixed to the integral member. It is characterized by being pivotally supported on the body 5.

  According to a third aspect of the present invention, there is provided the motor-operated valve according to the first aspect, wherein the integral member is a flat base plate 1 that supports the valve seat 3, and a ring-shaped stopper ring 12 c is attached to the valve seat 3. The stopper arm 12b is extended from the stopper ring 12c, the stopper rod 1 constituting the fixed stopper piece 12a is erected on the end of the stopper arm 12b, and the stopper rod 12a is attached to the integral member. The intermediate stopper body 6 is pivotally supported on the holding body 5 of the valve body 7 fixed to the integral member.

According to a fourth aspect of the present invention, in the means according to the second or third aspect, the holding body 5 supports the valve body 7 via a screw mechanism.
According to a fifth aspect of the present invention, there is provided the motor-operated valve according to the fourth aspect, wherein the valve body 7 is integrally formed with the rotor 8.

According to a sixth aspect of the present invention, in the motor-operated valve according to any one of the second to seventh aspects, a pipe-like support body 4 is provided on the valve seat 3 or the integral member, and the support body 4 is provided with the holding body 5. Is provided.
According to a seventh aspect of the present invention, in the motor valve according to the sixth aspect, the support body 4 includes one or more fluid movement holes 4a.

  According to an eighth aspect of the present invention, there is provided the motor-operated valve according to any one of the second to seventh aspects, wherein a solenoid position setting frame 51 is mounted on the lower surface of the base plate 1 that supports the valve seat 3, and the solenoid position setting frame is provided. The fixing position of the solenoid portion with respect to the base plate 1 can be selected by a plurality of engaging portions 51 a formed on the portion 51.

  According to a ninth aspect of the present invention, there is provided the motor operated valve according to any one of the second to seventh aspects, wherein a solenoid setting frame 61 is provided on the lower surface of the base plate 1 that supports the valve seat 3, An engaging portion 61a is provided, and the engaging portion 61a is clamped by two solenoid fixing frames 60a suspended from the solenoid portion.

  A motor-driven valve according to a tenth aspect is characterized in that, in any of the means according to the first to ninth aspects, the number of intermediate stopper bodies 6 is two or more.

The position setting method of the fixed stopper piece in the electric valve according to claim 11 is a method of setting a minimum opening position of the valve body 7 with respect to the valve seat 3 by a fixed stopper piece 2a provided on the valve seat 3 side. 2a is disposed on the valve seat 3 side so as to be movable in the circumferential direction. The rotor side stopper portion 8b that moves in proportion to the opening / closing amount of the valve body 7 temporarily closes the valve body 7 while moving the fixed stopper piece 2a. The fixed stopper piece 2a is moved backward by a predetermined amount corresponding to the minimum opening position of the valve body 7 together with the rotor side stopper portion 8b after the position is set, and the fixed stopper piece 2a is fixed to the valve seat 3 side at that position. And
In the description of the above means, the reference numerals are attached for easy understanding of the relationship with the description of the drawings, but the present invention is not limited to this.

The present invention has the following effects by the above configuration.
According to the first aspect of the present invention, the maximum rotational position in the valve closing direction of the rotor can be set by determining the distance (lift amount) between the valve body and the valve seat, and the set position of the stopper can be set to the dimensions of each component. It can be determined accurately regardless of accuracy.

  According to the second aspect of the present invention, the stopper slide groove is formed in the circumferential direction of the flat base plate, the fixed stopper piece is slidably / fixed, and the intermediate stopper body holds the valve body. By pivotally supporting the body, its configuration and position setting means were simplified.

According to the features of the invention described in claim 3, the stopper arm is extended from the stopper ring, the stopper bar is erected at the end of the stopper arm, and the stopper bar can be idled and fixed to an integral member. In addition, the intermediate stopper body is pivotally supported by the holding body of the valve body, thereby simplifying its configuration and position setting.
According to the feature of the invention as set forth in claim 4, since the holding body supports the valve body through the screw mechanism, the setting of the lift amount becomes more accurate.
According to the feature of the invention described in claim 5, the structure of the screw mechanism is further simplified by the valve body being integrally formed with the rotor.

According to the features of the invention described in claim 6, the valve seat or the integral member is provided with a pipe-like support, and the support is provided on the support, whereby the valve seat or the retainer to the integral member. The mounting means is simplified.
According to the feature of the invention described in claim 7, the flow of the refrigerant becomes smooth by forming the one or more fluid moving holes in the support.

  According to the feature of the invention described in claim 8, the solenoid position setting frame is mounted on the lower surface of the base plate, and the fixing position of the solenoid portion with respect to the base plate can be selected by a plurality of engaging portions, so Various postures can be easily selected and changed.

According to the ninth aspect of the invention, the engagement portion of the solenoid setting frame is clamped by the two solenoid fixing frames suspended from the solenoid portion, thereby easily positioning the solenoid portion. Can be set.
According to the feature of the invention described in claim 10, by setting the number of the intermediate stopper bodies to 2 or more, the resolution can be made finer and the lift amount can be set more accurately.

  According to the features of the invention described in claim 11, while the rotor-side stopper portion that moves in proportion to the opening / closing amount of the valve body moves the fixed stopper piece that is arranged to be movable in the circumferential direction on the valve seat side. Once the valve body is in the fully closed position, the fixed stopper piece is moved backward together with the rotor side stopper portion by a predetermined amount corresponding to the minimum open position of the valve body, and the fixed stopper piece is fixed to the valve seat side at that position. The position of the fixed stopper piece can be set by a very simple operation. In addition, this makes it possible to simplify the stopper position setting process.

The longitudinal cross-sectional view of the motor operated valve of Example 1 which concerns on this invention. The bottom view of the solenoid part of the motor operated valve of the Example 1. FIG. The top view (a), sectional drawing (b), and enlarged view (c) explaining the effect | action (1st state) of the motor operated valve of the Example 1. FIG. The top view (a), sectional drawing (b), and enlarged view (c) explaining the effect | action (2nd state) of the motor operated valve of the Example 1. FIG. The top view (a), sectional drawing (b), and enlarged view (c) explaining the effect | action (3rd state) of the motor operated valve of the Example 1. FIG. The longitudinal cross-sectional view of the motor operated valve of Example 2 which concerns on this invention. The principal part top view of the motor operated valve of the Example 2. FIG. The longitudinal cross-sectional view of the motor operated valve of Example 3 which concerns on this invention. The principal part bottom view of the motor operated valve of the Example 3. FIG. The longitudinal cross-sectional view of the motor operated valve of Example 4 which concerns on this invention. The principal part bottom view of the motor operated valve of the Example 4. FIG. The longitudinal cross-sectional view of the motor operated valve which concerns on a prior art.

  Hereinafter, embodiments of an expansion valve according to the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a motor-operated valve according to the present invention.

  Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a motor-operated valve according to a first embodiment, FIG. 2 is a bottom view of a solenoid portion of the motor-operated valve, and FIG. 3A is a plan view (a) illustrating a function (first state) of the motor-operated valve. Drawing (b), principal part enlarged view (c), and FIG. 3B are the top views (a), sectional drawing (b), principal part enlarged view (c), figure explaining the effect | action (2nd state) of the same motor operated valve. 3C is a plan view (a), a sectional view (b), and an enlarged view (c) for explaining the operation (third state) of the motor-operated valve.

  The motor-operated valve of the first embodiment can set the closed position (slightly open position) by rotating the valve body twice in order to enable accurate setting of the lift amount (small gap) L. Specifically, the present invention relates to means for accurately and easily setting the position of a fixed stopper piece for stopping the rotating rotor in the motor-operated valve.

In the motor-operated valve, a valve seat 3 is fitted and fixed to an opening 1a formed in a shaft portion of a base plate 1 having a disk shape in plan view, and a circular pipe hole 1b is formed in the vicinity of the opening 1a. The stopper slide groove 1c is formed in a circular shape with a predetermined width and depth on the upper surface periphery.
A seat hole 3a is formed in the valve seat 3, and a fluid inlet / outlet pipe 1d is fitted / connected, and a fluid inlet / outlet pipe 1e is also fitted / connected to the pipe hole 1b.
A can 9 having a lower surface formed in a skirt shape is welded to the upper surface of the outer peripheral portion of the base plate 1, and a solenoid position setting frame 11 penetrates the valve seat 3 and the fluid inlet / outlet pipe 1e on the lower surface. It is attached to. A rotor chamber 9 a is formed in the can 9.

  Further, a rod-like fixed stopper piece 2a is slidably and fixedly arranged in the stopper sliding groove 1c. The fixed stopper piece 2a is fixed to the stopper sliding groove 1c when the electric valve is in use. The present invention is particularly characterized by this fixed position setting means.

  A support 4 having a cylindrical shape and a large diameter surface is placed and fixed on the upper part of the valve seat 3, and a thick and cylindrical valve stem holder 5 is integrally formed on the support 4. Placed in. A plurality of fluid movement holes 4 a for communicating the inside and outside of the support body 4 are formed in the outer periphery of the lower part of the support body 4.

In addition, an intermediate stopper body 6 having a predetermined width and a predetermined thickness is fitted in a predetermined position on the large portion of the lower diameter of the valve stem holder 5 so as to be freely rotatable in the upper ring portion 6a, and an arm having the predetermined width is provided. An intermediate portion of the portion 6b is bent to form a contact portion 6c of a rotor-side stopper portion 8b (described later), and further, a contact portion 6c that is bent obliquely downward and can contact the fixed stopper piece 2a is formed. Has been.
An internal thread portion 5a is formed on the inner peripheral surface of the shaft opening formed above and below the valve stem holder 5, and a rod-shaped valve body 7 is rotatably fitted in the shaft opening. A male screw portion 7a formed on the outer peripheral portion of the valve body 7 is screwed with the female screw portion 5a.

  The upper part of the valve body 7 is integrally provided with a rotor 8 via a valve rod support 8a. The rotor 8 is rotatably arranged in the rotor chamber 9a with the valve body 7 as a rotation axis. By this rotation, the rotor 8 moves up and down, so that the conical valve portion 7b at the lower end of the valve body 7 is in the seat hole 3a. It arrange | positions so that the upper part may be contacted | separated and opened and closed the valve part 7b.

In the present embodiment, when the valve body 7 is closed, the seat hole 3a ensures the minimum flow rate of the refrigerant so that the valve portion 7b is "slightly open (closest to the seat hole 3a)". Hereinafter, the rotation stop position of the valve body 7, and thus the position of the fixed stopper is accurately set so as to be referred to as “lift amount L”.
In addition, a solenoid portion 10 is disposed outside the can 9, and a solenoid fixing rod 10a is provided in a welding portion 10c below the solenoid portion 10, and a lower end protrusion 10b of the solenoid fixing rod 10a is set to a solenoid position. The frame 11 is engaged with the engagement hole 11a.

  With the above configuration, the valve body 7 moves up and down together with the rotor 8 in accordance with the pulse amount of the current to the solenoid unit 10 to open and close the valve unit 7b. Therefore, even if the rotor 8 stops at an accurate position and the valve portion 7b reaches the lowest position, the lift amount L is maintained and the minimum flow rate is secured.

  The setting of the lift amount L depends on the setting of the lowest position of the valve body 7, which depends on the setting of the rotation angle of the valve body 7, and the setting of the rotation angle depends on the position of the fixed stopper piece 2a. In the first embodiment, in order to accurately set the position of the fixed stopper piece 2a, as shown in FIGS. 3A to 3C, first, the fixed stopper piece 2a is in a floating state (sliding) in the stopper sliding groove 1c. The rotor 8 is rotated, the intermediate stopper body 6 is pressed by the rotor-side stopper portion 8b and moved in the circumferential direction together with the rotor 8, and the valve portion 7b is closed (the valve portion 7b is seated). Rotate (until contact with the hole 3a) (state of FIG. 3A).

Next, the rotor 8 is rotated in the reverse direction by a predetermined angle. At this time, the intermediate stopper body 6 and the fixed stopper piece 2a are also moved together in the reverse direction together with the rotor 8 (state shown in FIG. 3B). The predetermined angle corresponds to the lift amount L.
Then, at this position, to secure the fixing stopper piece 2a to stop the sliding groove 1c. With the above setting, even if the valve body 7 is closed by the rotation of the rotor 8, the rotor 8 is stopped at the set position by the fixed stopper piece 2a, and the minute opening is maintained with the lift amount L remaining.

  Since the first embodiment is configured as described above, the lift amount L can be easily and accurately set regardless of the dimensional accuracy of each component. And the dispersion | variation in the amount of lift L and the position of the fixed stopper piece 2a can be eliminated.

  Next, a second embodiment of the present invention will be described. 4 is a longitudinal sectional view of the motor-operated valve according to the second embodiment, and FIG. 5 is a plan view of a main part of the motor-operated valve. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals as those in FIGS.

  In the fixed stopper piece 12a in the second embodiment, a ring-shaped stopper ring 12c (partially with a notch) as shown in FIG. 5 is pivotally attached to the valve seat 3, and the stopper arm 12b is attached from the stopper ring 12c. A stopper bar 12a that constitutes the fixed stopper piece is provided upright at the end of the stopper arm 12b. The stopper bar 12a is a base plate 1 that supports the valve seat 3 or the valve seat 3. Further, the intermediate stopper body 6 is pivotally supported by a holding body 5 of a valve body 7 fixed to the integral member.

  Further, as shown in FIG. 4, the intermediate stopper body 16 is horizontally formed with an upper ring portion 16 a loosely fitted on the outer periphery of the valve stem holder 5 and a predetermined width formed at a predetermined portion of the upper ring portion 16 a. Arm portion 16b and an abutting portion 16c formed obliquely downward from the arm portion 16b. The arm portion 16b is arranged in the rotation locus of the rotor side stopper portion 8b formed on the rotor 8. Further, the contact portion 16c is formed so as to be able to contact the stopper rod 12a.

  The lift amount L is set in the same manner as in the first embodiment. First, in the stopper sliding groove 1c, the fixed stopper piece 12a is set in the idle state (slidable state) on the base plate 1, and the rotor 8 is rotated. The intermediate stopper body 16 is pressed by the rotor-side stopper portion 8b and moved in the circumferential direction together with the rotor 8, and is rotated until the valve portion 7b is closed (until the valve portion 7b contacts the seat hole 3a). Next, the rotor 8 is rotated in the reverse direction by a predetermined angle. At this time, the intermediate stopper body 16 and the fixed stopper piece 12a are also moved together with the rotor 8 in the reverse direction. The predetermined angle corresponds to the lift amount L.

Then, at this position, to secure the stopper ring 12c of the stopper rod 12a in the valve seat 3. By setting the position of the stopper rod 12a accompanying the fixing, even if the valve body 7 is closed by the rotation of the rotor 8, the lift amount L remains and the minute opening is maintained.
Since the second embodiment is configured as described above, similarly to the first embodiment, the lift amount L can be easily and accurately set regardless of the dimensional accuracy of each component. And the dispersion | variation in the lift amount L and the position of the stopper stick | rod 12a can be reduced.

  Next, Embodiment 3 of the present invention will be described. FIG. 6 is a longitudinal sectional view of the motor-operated valve, and FIG. 7 is a bottom view of the main part (solenoid position setting frame 51). In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals as those in FIGS. 1 to 3, and the description thereof is omitted. The feature of the third embodiment resides in the solenoid position setting frame 51 that specifies the position of the solenoid fixing rod 50a provided in the solenoid unit 10.

That is, the solenoid position setting frame 51 provided in a joined state on the lower surface of the disk-shaped base plate 1 is a circular thin plate, and is provided with engaging portions 51a having a predetermined width in a bent state at eight locations on the outer periphery thereof. It has been. An engagement hole is formed in the engagement portion 51a. Then, the lower end protrusion 50b of the solenoid fixing rod 50a is engaged with the engagement hole, and the position of the solenoid unit 10 is specified (mauridome function). Further, in the third embodiment, since the eight engaging portions 51a are provided, there is an effect that the solenoid portion 10 can be attached to the base plate 1 at various angles.

  Next, a fourth embodiment of the present invention will be described. FIG. 8 is a longitudinal sectional view of the motor-operated valve, and FIG. 9 is a bottom view of the main part (solenoid position setting frame 61) of the motor-operated valve. In the fourth embodiment, the same components as those in the first embodiment are denoted by the same reference numerals as those in FIGS. 1 to 3, and the description thereof is omitted.

  As shown in FIG. 8, the feature of the fourth embodiment resides in a solenoid position setting frame 61 that specifies the position of a solenoid fixing rod 60 a provided in the solenoid unit 10. The solenoid fixing rod 60a of the fourth embodiment is composed of two parallel elastic thin plates, and the solenoid fixing rod 60a sandwiches an engaging portion 61a described later from both sides. Further, as shown in FIG. 9, the solenoid position setting frame 61 provided in a joined state on the lower surface of the disk-shaped base plate 1 has a substantially rectangular portion made of a thin plate and both sides of one protruding portion thereof downward. An engagement portion 61a having a predetermined width that is bent into a circular shape is provided. By the engagement of the solenoid fixing rod 60a with the engaging portion 61a, the solenoid portion 10 is supported by the base plate 1 at the mounting angle (mauridome function).

  In each of the above embodiments, the number of intermediate stoppers is 1. However, when the number is 2 or more, the lift amount can be set more accurately.

1 .... Disc-shaped base plate (integral member) 1a ... Opening 1b ... Pipe hole 1c ... Stopper sliding groove 1d ... Fluid inlet / outlet pipe 1e ... Fluid inlet / outlet pipe 2a ... Stopper bar (fixed stopper piece)
3 .... Valve seat ("integral member" in Example 2) 3a..Seat hole 4..Support body 4a..Fluid movement hole 5..Valve rod holder 5a..Female thread part 6..Intermediate stopper body 6a ··· Upper ring portion 6b · · Arm portion 6c · · Contact portion 7 · · Valve body 7a · · Male screw portion 7b · · Valve portion 8 · · Rotor 8a · · Valve stem support portion 8b · · Rotor side stopper portion 9 .. Can ("Integral member" in Example 3-5) 9a · · Rotor chamber 10 · · Solenoid portion 10 · · Solenoid fixing rod 10b · · Lower end projection 10c · · Welding portion 11 · · Solenoid position setting Frame 11a ··· engagement hole 12a · · stopper bar (fixed stopper piece) 12b · · stopper arm 12c · · stopper ring 16 · · intermediate stopper body 16a · · · upper ring portion 16b · · arm portion 16c · · abutment portion 42a. ・ Stopper bar (fixed stopper piece 42b ··· Stopper plate 50a · · Solenoid fixing rod 50b · · Lower end protrusion 51 · · Solenoid position setting frame 51a · · Engagement portion 60a · · Solenoid fixing rod 61 · · Solenoid position setting frame 61a · · Engagement portion

Claims (10)

A rotor that opens and closes the valve body by a solenoid portion is provided with a rotor-side stopper, an intermediate stopper body that is rotatably supported around the valve body is disposed, and a fixed stopper piece on a member that is integral with the valve seat Provided,
The intermediate stopper body includes an arm portion engageable with the rotor-side stopper portion and a contact portion engageable with the fixed stopper piece, and further, the fixed stopper piece is arranged on a circumference of the integral member. When the valve body is closed, the valve body is once moved to the fully closed position, the fixed stopper piece is moved backward by a predetermined amount, and the stopper piece is fixed to the valve seat at that position. A motor-operated valve characterized in that a minute lift amount can be set.   The integrated member is a flat base plate that supports the valve seat. A stopper sliding groove is formed in the circumferential direction of the base plate, and a fixed stopper piece is slid and fixed along the stopper sliding groove. 2. The motor-operated valve according to claim 1, wherein the motor-operated valve is arranged so as to be supported, and the intermediate stopper body is pivotally supported by a holding body of a valve body fixed to the integral member.   The integral member is a flat base plate that supports the valve seat. A ring-shaped stopper ring is pivotally attached to the valve seat, a stopper arm is extended from the stopper ring, and the fixed portion is fixed to the end of the stopper arm. A stopper rod constituting the stopper piece is erected, and the stopper rod can be idled and fixed with respect to the integral member, and the intermediate stopper body is a valve body fixed to the integral member. 2. The motor-operated valve according to claim 1, wherein the motor-operated valve is pivotally supported on the holding body.   4. The motor-operated valve according to claim 2, wherein the holding body supports the valve body via a screw mechanism.   The motor-operated valve according to claim 4, wherein the valve body is formed integrally with the rotor.   6. The electric valve according to claim 2, wherein a pipe-like support is provided on the valve seat or the integral member, and the holding body is provided on the support.   The motor-operated valve according to claim 6, wherein the support has one or more fluid movement holes.   8. A solenoid position setting frame is mounted on the lower surface of the base plate, and a fixed position of the solenoid portion with respect to the base plate can be selected by a plurality of engaging portions formed on the solenoid position setting frame. Any motorized valve described.   A solenoid setting frame is provided on a lower surface of the base plate, an engagement portion is provided on the solenoid setting frame, and the engagement portion is sandwiched by two solenoid fixing frames suspended from the solenoid portion. Item 8. The motor-operated valve according to any one of Items 2 to 7. A method of setting a minimum opening position of the valve body with respect to the valve seat by a fixed stopper piece provided on the valve seat side, wherein the fixed stopper piece is arranged movably in the circumferential direction on the valve seat side, and opens and closes the valve body The valve body is once brought into a fully closed position while moving the fixed stopper piece by the rotor side stopper portion that moves in proportion to the amount, and then the fixed stopper piece and the rotor side stopper portion are fully opened. A fixed stopper piece position setting method in an electric valve, wherein the fixed stopper piece is reversely moved by a predetermined amount corresponding to the position, and the fixed stopper piece is fixed to the valve seat side at that position.

Images