Electrically actuated valve

Abstract

The present invention provides an electrically actuated valve that can be scaled down through effective utilization of space. This electrically actuated valve comprises: a valve body having a valve seat and a valve chamber; a threaded bearing member attached to the valve body and provided with an internal thread; a threaded driving member which is provided with an external thread that threadably engages with the internal thread and which is displaced in an axial direction in response to rotation by a rotor of a motor; and a valve plug which is coupled to the threaded driving member and which is provided with a cylindrical part and a valve plug part. The valve plug part moves toward or away from the valve seat in a state in which the inner circumference of the cylindrical part of the valve plug is slidably fitted on the outer circumference of the threaded bearing member.

Description

Electric valve

[0001] The present invention relates to an electric valve.

[0002] For example, in the motor-driven electric valve shown in Patent Document 1, a valve shaft connected to the rotor of a stepping motor is displaced in the axial direction as the rotor rotates by the action of a feed screw mechanism formed by screwing a male screw portion and a female screw portion, thereby increasing or decreasing the gap between the valve body and the valve seat to control the flow rate.

[0003] Japanese Patent Application Laid-Open No. 2024-123628

[0004] Here, in the electric valve shown in Patent Document 1, the valve shaft is guided by a cylindrical spring case fixed to the valve body. However, by disposing the spring case inside the valve body, the effective utilization of the space inside the valve body cannot be achieved, and as a result, there is a problem that the overall length of the electric valve becomes long.

[0005] The present invention has been made in view of such problems, and an object thereof is to provide an electric valve capable of achieving miniaturization by effectively utilizing space.

[0006] The electric valve of the present invention includes: a valve body having a valve seat and a valve chamber; a screw bearing member attached to the valve body and provided with a female screw; a screw driving member provided with a male screw screwed into the female screw and displaced in the axial direction in response to the rotation of the rotor of a motor; and a valve body connected to the screw driving member and provided with a cylindrical portion and a valve body portion. The valve body portion approaches or separates from the valve seat in a state where the inner periphery of the cylindrical portion of the valve body is slidably fitted to the outer periphery of the screw bearing member.

[0007] According to the present invention, it is possible to provide an electric valve capable of achieving miniaturization by effectively utilizing space.

[0008] Figure 1 is a longitudinal cross-sectional view of an electric valve according to the first embodiment. Figure 2 is a cross-sectional view of the valve body. Figure 3 is a longitudinal cross-sectional view of an electric valve according to the second embodiment. Figure 4 is an enlarged cross-sectional view showing the area around the valve body of an electric valve according to the third embodiment. Figure 5 is an enlarged cross-sectional view showing the area around the valve body of an electric valve according to the fourth embodiment. Figure 6 is an enlarged cross-sectional view showing the area around the valve body of an electric valve according to the fifth embodiment.

[0009] Hereinafter, embodiments of the electric valve according to the present invention will be described with reference to the drawings. In this specification, the rotor side relative to the valve body will be described as the upper side, and the valve body side relative to the rotor will be described as the lower side.

[0010] (First Embodiment) Figure 1 is a longitudinal cross-sectional view of an electric valve 1 according to the first embodiment. The electric valve 1 of this embodiment is used, for example, to adjust the refrigerant flow rate in a refrigeration cycle. Let L be the axis of the electric valve 1.

[0011] The electric valve 1 consists of a valve body 10 with a valve seat 18 and a valve chamber VC formed inside, a top-cylindrical can 3 fixed to the upper end of the valve body 10 via an annular plate 11, a stepping motor consisting of a stator (not shown) fitted onto the can 3 and a rotor 57 equipped inside the can 3, a gear-type reduction mechanism 6 that reduces and transmits the rotational torque of the rotor 57, a valve body 4 that moves toward and away from the valve seat 18 to control the amount of refrigerant (fluid) that passes through, and a screw drive member (output shaft) 22 that drives the valve body 4 by converting the rotational movement of the output gear of the reduction mechanism 6 into linear movement via a screw feed mechanism 27. The can 3 refers to a cylindrical member attached to the valve body 10 side of the electric valve 1 so as to be sealed inside.

[0012] The valve body 10 is comprised of a thick-walled cylindrical section 10a, a thin-walled cylindrical section 10b connected to the upper end of the thick-walled cylindrical section 10a and thinner than the thick-walled cylindrical section 10a, and a partition wall 10d formed near the lower end of the thick-walled cylindrical section 10a. A communication hole 10f is formed in the thin-walled cylindrical section 10b, connecting the inside and outside. Through the communication hole 10f, the space inside the can 3, outside the thin-walled cylindrical section 10b, and the space inside the thin-walled cylindrical section 10b, connected to the valve chamber VC, can be maintained at approximately equal pressure.

[0013] An orifice passage 10c (also called a valve opening) is formed in the partition wall 10d, which communicates with the valve chamber VC. The upper end of the orifice passage 10c constitutes the valve seat 18.

[0014] An opening 12 is formed in the peripheral wall near the lower end of the thick-walled circular pipe section 10a. The opening 12 is formed by connecting a large-diameter opening 12a and a small-diameter opening 12b, which has a center shifted downward relative to the center of the large-diameter opening 12a. The small-diameter opening 12b may be circular or non-circular. The end of the second pipe P2 is fitted into the circular large-diameter opening 12a so as to be able to communicate with the valve chamber VC via the small-diameter opening 12b, and the two are fixed together by brazing or the like. Let the axis of the second pipe P2 be O. The axis O is perpendicular to the axis L.

[0015] The upper outer circumference of the first pipe P1 is fitted to the lower inner circumference of the thick-walled cylindrical section 10a that protrudes downward from the partition wall 10d. The thick-walled cylindrical section 10a and the first pipe P1 are fixed together by brazing or the like, with the upper end of the first pipe P1 in contact with the lower surface of the partition wall 10d. Here, the second pipe P2 is assumed to be the inlet pipe, and the first pipe P1 is assumed to be the outlet pipe.

[0016] The reduction mechanism 6 comprises a sun gear 61 integrally formed with the rotor support member 56 on the inner circumference side of the rotor 57, a fixed ring gear 62 fixed via a thin-walled cylindrical body 66 fixed to the upper part of the thin-walled cylindrical portion 10b of the valve body 10, a planetary gear 63 positioned between the sun gear 61 and the fixed ring gear 62 and meshing with each of them, a carrier 64 that rotatably supports the planetary gear 63, and a bottomed cylindrical output gear member 65 having teeth on its inner circumference that mesh with the planetary gear 63. These components constitute a unique planetary gear reduction mechanism. The number of teeth on the fixed ring gear 62 is set to be different from the number of teeth on the output gear member 65.

[0017] The shaft member 8 passes through the rotor support member 56 and the sun gear 61, which are joined to the upper end of the rotor 57, and holds them in a rotatable manner. The upper end of the shaft member 8 is supported by a support member 81 located inside the top of the can 3.

[0018] The upper part of the stepped cylindrical output shaft portion 29, formed on the upper part of the screw drive member 22, is press-fitted into the center of the bottom of the output gear member 65, and the lower end of the shaft member 8 is press-fitted into the upper opening of this output shaft portion 29.

[0019] The screw bearing member 13 consists of an upper cylindrical portion 13a press-fitted into the inner circumference of the thin-walled cylindrical portion 10b of the valve body 10, and a lower cylindrical portion 13b having a smaller diameter than the upper cylindrical portion 13a. The male screw portion 22a formed on the lower part of the screw drive member 22 is screwed into the female screw portion 13c formed on the inner circumference of the lower cylindrical portion 13b. The rotational movement of the output gear member 65 transmitted from the rotor 57 via the reduction mechanism 6 is converted into linear movement along the axis L by the screw feeding mechanism (conversion mechanism) 27 consisting of the male screw portion 22a and the female screw portion 13c.

[0020] The output shaft portion 29 is connected to the screw drive member 22 so as to be able to rotate integrally with the screw drive member 22 and move relative to it in the axial direction, by slidably fitting a blade 22b that protrudes from the upper end of the screw drive member 22 into a slit groove 29a formed at the lower end of the output shaft portion 29. Therefore, when the output gear member 65 (rotor 57) rotates, the output shaft portion 29 and the screw drive member 22 rotate together and move linearly relative to the valve body 10 along the axis L.

[0021] The linear movement of the screw drive member 22 is transmitted to the valve body 4 via a ball-shaped joint 25 consisting of a ball 23 and a ball seat 24.

[0022] Figure 2 is a cross-sectional view of the valve body 4. The valve body 4 is made of stainless steel, for example, and has a cylindrical portion 4a with a substantially uniform outer diameter and a hollow cylindrical portion 4b coaxially connected to the outer circumference of the upper end of the cylindrical portion 4a. The valve body 4 can be machined integrally by cutting, but for example, the cylindrical portion 4a and the cylindrical portion 4b may be formed separately and then integrated by welding or the like.

[0023] The outer diameter of the cylindrical portion 4a is smaller than the outer diameter of the cylindrical portion 4b. Furthermore, a tapered valve body portion 4c is formed at the lower end of the cylindrical portion 4a, which decreases in diameter towards the bottom. A stepped opening 4d is formed at the center of the upper end of the cylindrical portion 4a. A ball seat 24 (Figure 1), made of a material with superior wear resistance to the valve body 4, is press-fitted into the stepped opening 4d.

[0024] A flange portion 4e is formed at the upper end of the cylindrical portion 4b, which has a uniform wall thickness, and protrudes radially outward. At the intersection of the outer circumference of the cylindrical portion 4b and the lower surface of the flange portion 4e, a relief portion 4f is formed, which is a circumferential groove with a substantially V-shaped cross-section, cut radially inward along the entire circumference, and a chamfered portion 4g is formed on the inner circumference of the flange portion 4e.

[0025] In Figure 1, the valve body 4 is attached to the screw bearing member 13 such that the inner circumference of the cylindrical portion 4b is slidably fitted to the outer circumference of the lower cylindrical portion 13b. The valve body 4 is guided axially by the lower cylindrical portion 13b and supported so as to be displaceable in the direction of approaching or moving away from the valve seat 18. Because the cylindrical portion 4b ensures a relatively long fitting length, tilting of the valve body 4 is suppressed and operation can be performed with high precision. In addition, because a chamfered portion 4g is formed, the lower cylindrical portion 13b can be smoothly assembled and inserted into the cylindrical portion 4b.

[0026] With the valve body 4 assembled to the valve body 10, a compression coil spring (elastic body) 26 with a uniform coil outer diameter is positioned between the annular portion 10e, which protrudes from the inner circumference of the thick-walled cylindrical portion 10a over its entire circumference, and the flange portion 4e, constantly biasing the valve body 4 in the opening direction relative to the valve body 10. At this time, since a relief portion 4f is formed on the lower surface of the flange portion 4e, the inner diameter of the coil of the compression coil spring 26 can be brought as close as possible to the outer diameter of the cylindrical portion 4b.

[0027] Furthermore, the annular portion 10e is located below the upper end of the large-diameter opening 12a and above the upper end of the small-diameter opening 12b, and there is almost no gap between the inner circumference of the annular portion 10e and the outer circumference of the cylindrical portion 4b, thus reducing the volume of the valve chamber VC between the partition wall 10d and the annular portion 10e.

[0028] (Operation of the electric valve) When the rotor 57 of the stepping motor is driven to rotate in one direction by supplying a predetermined number of valve closing control signals to the stator from a control device (not shown), the rotational speed is input from the sun gear 61 to the reduction mechanism 6, and the rotational speed reduced by the reduction mechanism 6 is then transmitted to the screw drive member 22 via the output shaft 29. When the screw drive member 22 rotates in one direction, the female screw portion 13c and the male screw portion 22a screw relative to each other, and the screw drive member 22 moves downward in the direction of the axis L according to the rotational speed. The thrust of this screw drive member 22 is transmitted to the valve body 4 via the ball joint 25, and the valve body 4 descends while compressing the compression coil spring 26, and the valve body portion 4c approaches and seats on the valve seat 18, closing the orifice passage 10c. As a result, the flow of refrigerant is interrupted between the second pipe P2 and the first pipe P1 with the valve chamber VC in between.

[0029] On the other hand, when the rotor 57 of the stepping motor is rotated in another direction by supplying an opening control signal to the stator from a control device (not shown), the screw drive member 22 moves upward in the direction of the axis L via the reduction mechanism 6 and the screw feed mechanism 27. As a result, when the valve body 4 rises in accordance with the elastic force of the compression coil spring 26, the valve body portion 4c separates from the valve seat 18 and the orifice passage 10c is opened. As a result, the refrigerant that has passed from the second pipe P2 through the opening 12 flows to the first pipe P1 via the valve chamber VC and the orifice passage 10c. When the valve body 4 rises by its maximum stroke, it is preferable that the upper end of the cylindrical portion 4a is at the same position as the upper end of the small diameter opening 12b or lower.

[0030] In this embodiment, the entire screw drive member 22, including the lower cylindrical portion 13b of the screw bearing member 13, the slit groove 29a of the output shaft portion 29, and the blade 22b, is arranged radially inside the cylindrical portion 4b of the valve body 4, and the compression coil spring 26 is arranged radially outside the cylindrical portion 4b. As a result, the space inside and outside the valve body 10 can be effectively utilized, thereby reducing the overall length of the electric valve 1. Furthermore, since the relatively rigid cylindrical portion 4b of the valve body 4 is guided along the lower cylindrical portion 13b, high vibration resistance can be ensured.

[0031] Furthermore, by providing an annular portion 10e near the opening 12, the volume of the valve chamber VC can be reduced. As a result, turbulence can be suppressed when the refrigerant that has passed from the second pipe P2 through the opening 12 enters the valve chamber VC, and it can be smoothly discharged from the orifice passage 10c. In addition, since the outer diameter of the cylindrical portion 4a intersecting the axis O is smaller than the outer diameter of the cylindrical portion 4b and they are of the same diameter, obstruction of the flow of refrigerant entering from the opening 12 is suppressed.

[0032] Furthermore, according to this embodiment, when the lubricant applied between the female thread portion 13c of the screw bearing member 13 and the male thread portion 22a of the screw drive member 22 is mixed into the refrigerant and carried to the outside, it must first rise through the gap between the inner circumference of the cylindrical portion 4b and the lower cylindrical portion 13b, wrap around the upper end of the flange portion 4e, and descend along the outer circumference of the cylindrical portion 4b to the valve chamber VC, thus requiring a long route. Therefore, leakage of lubricant from between the female thread portion 13c and the male thread portion 22a can be effectively prevented, and wear during long-term screwing can be reduced.

[0033] (Second Embodiment) Figure 3 is a longitudinal cross-sectional view of the electric valve 1A according to the second embodiment. In this embodiment, the configuration of the valve body 10A and the valve element 4A is different from that of the first embodiment. The other configurations are the same as in the first embodiment, so a redundant explanation will be omitted.

[0034] Compared to the first embodiment, the valve body 4A has a shorter overall length in the cylindrical portion 4Aa. The rest of the valve body 4 configuration (including the cylindrical portion 4b) is the same as in the first embodiment, so a redundant explanation is omitted.

[0035] As a result of shortening the overall length of the cylindrical portion 4Aa, the overall length of the thick-walled cylindrical portion 10Aa of the valve body 10A is shortened compared to the first embodiment. In addition, the position of the annular portion 10Ae is changed to be closer to the valve seat 18, and accordingly, the upper end position of the small-diameter opening 12Ab of the opening 12A is lower than in the first embodiment. This makes it possible to reduce the volume of the valve chamber VC compared to the first embodiment. The small-diameter opening 12Ab may be circular, or it may be non-circular (for example, a D-shape with an arc at the bottom when viewed in the direction of axis O) so as not to interfere with the annular portion 10Ae. The other configurations are the same as in the first embodiment, so a redundant explanation is omitted.

[0036] (Third Embodiment) Figure 4 is an enlarged cross-sectional view showing the area around the valve body 4B of the electric valve according to the third embodiment. In this embodiment, the main differences from the first embodiment are the configuration of the valve body 10B, valve body 4B, and screw bearing member 13B, and the addition of a spring receiving member 15B. The other configurations are the same as in the first embodiment, so a redundant explanation will be omitted.

[0037] The valve body 10B does not have an annular portion on its inner circumference, but instead has a first stage portion 10Bg and a second stage portion 10Bh located above the first stage portion 10Bg. A spring receiving member 15B with an L-shaped cross-section, which has a cylindrical portion 15Ba and a flange portion 15Bb that protrudes radially inward from the lower end of the cylindrical portion 15Ba, is press-fitted to the first stage portion 10Bg.

[0038] Furthermore, a ring member 16B is press-fitted into the opening 10Bc formed in the partition wall 10Bd of the valve body 10B, with the upper end of the ring member 16B forming the valve seat 18B, and the inside of the ring member 16B forming the orifice passage. The rest of the valve body 10B is the same as in the first embodiment, so a redundant explanation will be omitted.

[0039] The screw bearing member 13B has an outer wall portion 13Bd formed by extending the lower end outer periphery of the upper cylindrical portion 13Ba downward. The outer wall portion 13Bd is press-fitted into the inner periphery of the valve body 10B at its lower end outer periphery and is attached by abutting against the second step portion 10Bh. A communication hole 13Be is formed so as to communicate the upper cylindrical portion 13Ba vertically. Since the configuration of the screw bearing member 13B other than this (including the lower cylindrical portion 13b) is the same as that of the first embodiment, redundant description is omitted.

[0040] The valve body 4B has a cylindrical portion 4Ba with a short overall length and a cylindrical portion 4b coaxially connected to the outer periphery of the upper end of the cylindrical portion 4Ba. Since the configuration of the cylindrical portion 4b disposed inside the outer wall portion 13Bd in the radial direction is the same as that of the first embodiment, redundant description is omitted.

[0041] A tapered valve body portion 4Bc that tapers downward is formed at the lower end of the cylindrical portion 4Ba and can be seated on the valve seat 18B. A ball seat 24 is press-fitted into the stepped opening 4Bd formed at the center of the upper end of the cylindrical portion 4Ba.

[0042] The upper part of the cylindrical portion 4b including the flange portion 4e of the valve body 4B is disposed in the cylindrical space between the outer periphery of the lower cylindrical portion 13b of the screw bearing member 13B and the outer wall portion 13Bd. A compression coil spring 26 is disposed between the flange portion 15Bb of the spring receiving member 15B and the flange portion 4e of the cylindrical portion 4b, and biases the valve body 4B in the valve opening direction with respect to the valve body 10B at all times.

[0043] According to the present embodiment, by installing the spring receiving member 15B, it is not necessary to form an annular portion on the inner periphery of the valve body 10B, and for example, when machining the valve body by cutting, the machining cost can be reduced.

[0044] (Fourth Embodiment) FIG. 5 is an enlarged cross-sectional view showing the periphery of the valve body 4B of the electric valve according to the fourth embodiment. In the present embodiment, the configurations of the valve body 10C and the screw bearing member 13C are different from those of the third embodiment. Since the other configurations are the same as those of the third embodiment, redundant description is omitted.

[0045] In the present embodiment, the screw bearing member 13C has an upper disk portion 13Ca and a lower cylindrical portion 13b. A communication hole 13Ce is formed so as to vertically communicate the upper disk portion 13Ca. Since the configuration of the screw bearing member 13C other than this (including the lower cylindrical portion 13b) is the same as that of the third embodiment, redundant description is omitted.

[0046] The valve body 10C is provided with a caulking portion 10Ci on the inner circumference above the second step portion 10Bh. Since the configuration of the valve body 10C other than this is the same as that of the third embodiment, redundant description is omitted.

[0047] Before assembly, the screw bearing member 13C is inserted into the valve body 10C so that the upper disk portion 13Ca is fitted to the inner circumference of the caulking portion 10Ci which is a thin-walled cylindrical shape before assembly. Further, by plastically deforming the caulking portion 10Ci inward in the radial direction, the upper disk portion 13Ca can be fixed to the valve body 10C. According to the present embodiment, the electric valve can be assembled in a simpler process.

[0048] (Fifth Embodiment) FIG. 6 is a cross-sectional view showing an enlarged view of the periphery of the valve body 4B of the electric valve according to the fifth embodiment. In the present embodiment, compared with the third embodiment, the spring receiving member is not attached to the first step portion 10Bg of the valve body 10C, and the configuration of the compression coil spring (elastic body) 26D is different. Since the other configurations are the same as those of the third embodiment, redundant description is omitted.

[0049] The compression coil spring 26D is a conical spring whose upper end coil diameter is smaller than the lower end coil diameter. Therefore, even if the first step portion 10Bg is shifted radially outward with respect to the flange portion 4e of the cylindrical portion 4b, the compression coil spring 26D can be disposed between the flange portion 4e and the first step portion 10Bg, and the valve body 4B can be constantly urged in the valve opening direction with respect to the valve body 10C.

[0050] According to the present embodiment, since the spring receiving member can be omitted, an electric valve with fewer parts and lighter weight can be provided.

[0051] Note that the specific configuration of the electric valve is not limited to the above-described embodiments, and of course, design changes within the scope not departing from the gist of the present invention are also included in the present invention.

[0052] This specification includes the following disclosures of the invention: (First aspect) An electric valve comprising: a valve body having a valve seat and a valve chamber; a screw bearing member attached to the valve body and having a female thread; a screw driving member having a male thread that screws into the female thread and is displaced axially in accordance with the rotation of the rotor of a motor; and a valve body connected to the screw driving member and having a cylindrical portion and a valve body portion, wherein the inner circumference of the cylindrical portion of the valve body is slidably fitted to the outer circumference of the screw bearing member, and the valve body portion moves closer to or further away from the valve seat.

[0053] (Second embodiment) An electric valve according to the first embodiment, characterized in that the screw drive member is arranged radially inward of the cylindrical portion of the valve body.

[0054] (Third embodiment) An electric valve according to the first or second embodiment, characterized in that an elastic body is disposed between a flange portion formed on the valve body and an annular portion formed on the inner circumference of the valve body, and biases the valve body relative to the valve body in a direction that separates the valve body portion from the valve seat.

[0055] (Fourth embodiment) An electric valve according to the first or second embodiment, characterized in that an elastic body is disposed between a flange portion formed on the valve body and a spring receiving member attached to a stepped portion formed on the inner circumference of the valve body, thereby biasing the valve body relative to the valve body in a direction that separates the valve body portion from the valve seat.

[0056] (Fifth embodiment) The electric valve of the fourth embodiment, characterized in that the screw bearing member has an outer wall portion and a cylindrical portion disposed radially inward from the outer wall portion, and the flange portion is disposed between the outer wall portion and the cylindrical portion.

[0057] (Sixth embodiment) An electric valve according to the first or second embodiment, characterized in that a stepped portion formed on the inner circumference of the valve body is shifted radially outward with respect to a flange portion formed on the valve body, an elastic body is disposed between the flange portion and the stepped portion, and biases the valve body relative to the valve body in a direction that separates the valve body portion from the valve seat.

[0058] (Seventh aspect) The electric valve according to any of the first to sixth aspects, characterized in that the screw bearing member is fixed to the valve body by crimping.

[0059] 1, 1A Electric valve 10, 10A, 10B, 10C Valve body 10Ci Crimped part 3 Can 4, 4A, 4B Valve body 4a, 4Aa Cylindrical part 4b Cylinder part 4e Flange part 6 Reduction mechanism 8 Shaft member 13, 13B, 13C Screw bearing member 15B Spring receiving member 16B Ring member 18, 18B Valve seat 22 Screw drive member 26, 26D Compression coil spring 27 Screw feed mechanism 57 Rotor VC Valve chamber P1 First pipe P2 Second pipe L Axis

Claims

1. An electric valve comprising: a valve body having a valve seat and a valve chamber; a screw bearing member attached to the valve body and having a female thread; a screw drive member having a male thread that screws into the female thread and is displaced axially in accordance with the rotation of the motor rotor; and a valve body connected to the screw drive member and having a cylindrical portion and a valve body portion, wherein the inner circumference of the cylindrical portion of the valve body is slidably fitted to the outer circumference of the screw bearing member, and the valve body portion moves closer to or further away from the valve seat.

2. The electric valve according to claim 1, characterized in that the screw drive member is arranged radially inward of the cylindrical portion of the valve body.

3. The electric valve according to claim 1, characterized in that an elastic body is disposed between the flange portion formed on the valve body and the annular portion formed on the inner circumference of the valve body, and biases the valve body relative to the valve body in a direction that separates the valve body portion from the valve seat.

4. The electric valve according to claim 1, characterized in that an elastic body is disposed between a flange portion formed on the valve body and a spring receiving member attached to a stepped portion formed on the inner circumference of the valve body, thereby biasing the valve body relative to the valve body in a direction that separates the valve body portion from the valve seat.

5. The electric valve according to claim 4, wherein the screw bearing member has an outer wall portion and a cylindrical portion disposed radially inward from the outer wall portion, and the flange portion is disposed between the outer wall portion and the cylindrical portion.

6. The electric valve according to claim 1, characterized in that the stepped portion formed on the inner circumference of the valve body is shifted radially outward with respect to the flange portion formed on the valve body, an elastic body is disposed between the flange portion and the stepped portion, and the elastic body biases the valve body relative to the valve body in a direction that separates the valve body portion from the valve seat.

7. The electric valve according to any one of claims 4 to 6, characterized in that the screw bearing member is fixed to the valve body by crimping.

Images