JP2015028347A - Valve and valve attachment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ball valve which can exert a self-closing function by a simple mechanism.SOLUTION: A ball valve attachment adds a self-closing function to a ball valve which comprises: a cylindrical valve main body having a flow passage for circulating a transportation fluid therein; a spherical valve body which is supported on the flow passage in the valve main body so as to be turnable, and in which a communication passage communicating to the flow passage is formed while penetrating therethrough; an operation member which is connected to the valve body, and turns the valve body in the valve main body; and a turn regulation protrusion which limits a turning range of the operation member so that the flow passage is brought into a closed state when being locked with a part of the operation member. The ball valve attachment comprises: a helical torsion coil spring which is directly or indirectly fixed to the valve main body at one end, and imparts a biasing force to the operation member so as to press a part of the operation member to the turn regulation protrusion; and a cover member which covers the helical torsion coil spring, is fixed with the other end of the helical torsion coil spring, and arranged so as to turn together with the operation member.

Description

  The present invention relates to a valve for blocking and opening a fluid flow.

  Conventionally, in order to shut off and open the flow of transport fluids such as liquids such as water and oil, and gases such as LP gas, valves that turn off and open by rotating a valve body such as a ball valve have been used. (See, for example, Patent Document 1). In a general ball valve, the valve is opened and closed by turning a handle by 90 °. When a ball valve is used for an application in which it is shut off during normal times and temporarily opened, the valve may be forgotten to close due to the fact that a relatively large torque is required to operate the handle. In addition, when many valves need to be operated in a short time, the burden on the operator is heavy.

JP 2005-233395 A

  By using a solenoid valve, etc., it is possible to prevent forgetting to close the valve or reduce the burden on the operator, but the mechanism of the solenoid valve is complicated and there are many restrictions on the environment that can be introduced. It cannot be easily introduced. Therefore, the problem to be solved by the present invention is to provide a self-closing valve with a simple structure.

In order to solve the above problems, a valve attachment according to the present invention is supported on a cylindrical valve body having a flow path for circulating a transport fluid therein, and rotatably on the flow path in the valve body. A spherical valve body in which a communication passage communicating with the flow path is formed, an operation member connected to the valve body for rotating the valve body in the valve body, and a part of the operation member locked A valve attachment for adding a self-closing function to a ball valve provided with a rotation restricting protrusion that restricts a rotation range of the operation member so that the flow path is sometimes closed, one end of which is directly or directly on the valve body A torsion coil spring that is indirectly fixed and applies a biasing force to the operation member so as to press a part of the operation member against the rotation restricting protrusion;
A cover member that covers the torsion coil spring and is fixed so that the other end of the torsion coil spring is fixed and rotates together with the operation member.

  The valve attachment according to the present invention may further include a fixing base that is fixed to the valve body and to which one end of the torsion coil spring is fixed, and the torsion coil spring is covered with the fixing base and the cover member. In addition, the fixing base may be configured to include a clamp that holds the valve body.

  In the valve attachment according to the present invention, the cover member and the fixing base may be provided with a preliminary restricting portion that restricts the rotation of the cover member relative to the fixing base in a state where the ball valve attachment is not attached to the ball valve.

  Further, the valve according to the present invention includes a cylindrical valve body having a flow path for circulating a transport fluid therein, and a communication path that is rotatably supported on the flow path in the valve body and communicates with the flow path. A spherical valve body through which the valve body is formed, an operation member for rotating the valve body within the valve body by rotating integrally with the valve body, and a part of the operation member. A rotation restricting projection that restricts the rotation range of the operation member so that the flow path is closed when stopped, and one end is directly or indirectly fixed to the valve body, and the other end is fixed to the operation member. A torsion coil spring that applies an urging force to the operation member so as to press a part of the member against the rotation restricting protrusion, the operation member being disposed through the inside of the torsion coil spring, and the operation member being a torsion coil spring And the other end of the torsion coil spring A cover member to be constant.

  The valve according to the present invention may further include a fixing base that is fixed to the valve body and to which one end of the torsion coil spring is fixed, and the torsion coil spring may be covered with the fixing base and the cover member.

  The valve and ball valve attachment of the present invention can realize a self-closing function with a simple mechanism, and can be expected to have effects such as preventing forgetting to close the valve and reducing the burden on the operator.

FIG. 1 is a cross-sectional view of the ball valve according to the first embodiment. FIG. 2 is an exploded view of the ball valve according to the first embodiment. FIG. 3 is a top view showing the valve main body 11 together with the rotation restricting member 22. FIG. 4 is an explanatory diagram showing the configuration of the fixing base 34 used in the ball valve according to the second embodiment. FIG. 5 is a top view showing the configuration of the ball valve according to the second embodiment. FIG. 6 is an explanatory view showing a modified example of the fixing base 24.

[First Embodiment]
Hereinafter, a first embodiment of the valve of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the ball valve 1 includes a cylindrical valve body 11 having both ends opened, a spherical valve body 12 rotatably supported in the valve body 11, And an operation member 13 connected to the body 12 for rotating the valve body 12. The operation member 13 includes a stem 21, a rotation restricting member 22, an extension member 23, a cover 26, a handle 27, a spring washer 28, and a nut 29 which will be described later.

  The valve body 11 is substantially formed by screwing a male part 14 arranged on one end side which is the left side in FIG. 1 and a female part part 15 arranged on the other end side which is the right side in FIG. It is formed in a cylindrical shape. A flow path 16 that extends linearly along the axial direction is formed inside the valve main body 11. Further, female threaded portions 17 are respectively screwed on the inner peripheral surfaces of both end portions of the valve body 11. Piping can be connected to each end of the valve body 11 via the female thread portion 17.

  On the inner peripheral surface of the male part 14, a first contact portion 14 a is provided in an annular shape near the other end so as to be orthogonal to the axis of the male part 14. On the inner peripheral surface of the female die 15, a second contact portion 15 a is provided in an annular shape so as to be orthogonal to the axial line of the female die 15 at substantially the center in the axial direction. Inside the female part 15, an accommodation space is formed on the flow path 16 between the first contact part 14 a and the second contact part 15 a, and the valve body 12 is accommodated in this accommodation space. Yes.

  The valve body 12 is formed with a communication passage 12a extending linearly therethrough. On the inner surfaces of the first abutting portion 14a and the second abutting portion 15a, a pair of annular sealing materials 18 are disposed so as to abut the respective outer surfaces. When the inner peripheral surface of the sealing material 18 is pressed into contact with the outer peripheral surface of the valve body 12, a space 19 is formed by the valve body 11, the valve body 12, and the sealing material 18. The gap between is sealed.

  On the outer peripheral surface of the female die 15, a cylindrical bearing portion 20 is provided projecting radially outward at a position corresponding to the space portion 19. The outer end of the bearing portion 20 is opened to the outside of the valve body 11, and the inner end is opened to the space portion 19, and the interior of the bearing portion 20 and the space portion 19 are communicated with each other. And in the bearing part 20, the stem 21 which comprises the operation member 13 is inserted and hold | maintained so that rotation is possible.

  A first rotation restricting protrusion 201 and a second turn restricting protrusion 202 are respectively provided on the outer peripheral surface of the bearing portion 20. The stem 21 and the valve connected thereto are engaged with the rotation restricting member 22 described later. The rotation range of the body 12 is limited. In a state where the rotation restricting member 22 is locked to the first rotation restricting protrusion, the channel 16 and the communication path 12a are closed. On the other hand, in a state where the stem is rotated by 90 ° and the rotation restricting member 22 is locked to the second rotation restricting protrusion 202, the flow path 16 and the communication path 12a are in an open state.

  The stem 21 is formed in a columnar shape, and an extraction restricting portion 211 protrudes from an inner peripheral surface of the stem 21 so as to form an annular shape, and a connecting convex portion 212 having a substantially rectangular plate shape protrudes from the inner end surface. It is installed. On the other hand, a connecting recess 121 is cut out on the outer surface of the valve body 12 so as to have a shape corresponding to the connecting protrusion 212. The stem 21 is inserted into the bearing portion 20 from the accommodating space side of the valve body 11 so that the outer end portion protrudes from the outer end opening of the bearing portion 20 and the inner surface of the valve body 11 forming the accommodating space. Is held in the bearing portion 20 in a state in which the extraction restricting portion 211 is in contact therewith. In this state, the stem 21 is restricted from being pulled out from the bearing portion 20 due to the engagement relationship between the withdrawal regulating portion 211 and the inner surface of the valve body 11. Then, when the stem 21 is inserted and held in the bearing portion 20, the coupling convex portion 212 of the stem 21 is engaged with the coupling concave portion 121 of the valve body 12, thereby connecting the coupling convex portion 212 and the coupling concave portion 121 to the coupling portion. As shown, the inner end of the stem 21 is connected to the valve body 12.

  A sealing member such as an O-ring is fitted on the outer peripheral surface of the central portion in the axial direction of the stem 21, and the gap between the inner peripheral surface of the bearing portion 20 and the outer peripheral surface of the stem 21 is sealed. Therefore, even when the transport fluid flows out from the communication passage 12a of the valve body 12 to the space portion 19 through the communication hole 25, the transport fluid can be prevented from leaking from the bearing portion 20 to the outside.

  As shown in FIGS. 1 and 2, a male screw portion 213 is engraved on the upper end portion of the stem 21. Two flat surfaces parallel to each other are formed on the side surface of the male screw portion 213. A rotation restricting member 22 that restricts the turning range of the stem 21 and an extension member 23 that extends the axial length of the stem 21 are attached to the male screw portion 213.

  The rotation restricting member 22 has a disk-like shaft engaging portion 221 provided with a connection hole 223 having the same shape as the cross section of the male screw portion 213, and protrudes radially outward from the shaft engaging portion 221 with about 90. And a locking portion 222 formed by being bent several times. The rotation restricting member 22 penetrates the male screw part 213 into the connecting hole of the shaft engaging part 221, whereby the flat surface of the side surface of the male screw part 213 is engaged with the connecting hole 223 and rotates together with the stem 21.

  The rotation restricting member 22 engages with the first rotation restricting protrusion 201 and the second turn restricting protrusion 202 protruding from the outer peripheral surface of the bearing portion 20, so that the stem 21 and the valve body 12 connected thereto are connected. Limit the range of rotation. As shown in FIG. 3, the first rotation restricting protrusion 201 and the second rotation restricting protrusion 202 are arranged at positions shifted from each other by 90 ° on the outer peripheral surface of the bearing portion 20, and the rotation restricting member 22 is moved in the first turn. In the state of being locked by the restriction protrusion, the flow path 16 and the communication path 12a are closed, and in the state where the rotation restriction member 22 is engaged with the second rotation restriction protrusion 202, the flow path 16 and It will be in the open state where the communication path 12a was connected.

  The extension member 23 includes a cylindrical large-diameter portion 231, one end of the large-diameter portion is provided with a female screw portion 232 that is screwed with the male screw portion 213, and the other end is a male screw portion having the same cross-sectional shape as the male screw portion 213. 233 is provided. The rotation restricting member 22 and the extension member 23 are fixed to the stem 21 by screwing and tightening the female screw portion 232 with the rotation restricting member 22 interposed in the male screw portion 213. In order to prevent the screw screwed by the operation of the operation member 13 from being loosened, it is desirable to fix the rotation restricting member 22 and the extension member 23 by welding, adhesion, or the like. Further, the rotation restricting member 22 and the extending member 23 may be integrally formed.

  A fixing base 24 is fixed to the valve body 11 and disposed at a position facing the outer end of the bearing portion 20 with the rotation restricting member 22 in between. The fixed base 24 includes a base portion 241 on a flat plate, an opening 242 provided in the center of the base portion 241 and through which the extension member 23 is inserted, and an outer edge portion of the base portion 241. A spring fixing portion 243 to which one end is fixed and a fixing portion 244 for fixing the base portion 241 to the valve body 11 are provided.

  The base portion 241 is fixed to the valve body 11 by the fixing portion 244 in a state where the large diameter portion 231 of the extension member 23 is passed through the opening 242. The fixing portion 244 extends from the base portion 241 and is bent into a U shape. The end portion of the fixing portion 244 does not interfere with the stem 21 and the rotation restricting member 22, for example, by welding to the outer peripheral surface of the bearing portion 20. It is fixed.

  A torsion coil spring 25 is provided so as to cover a portion exposed from the fixing base 24 in the large diameter portion 231 of the extension member 23. One end of the torsion coil spring 25 is fixed to the spring fixing portion 243 of the fixing base 24 by, for example, welding. A cover member 26 is covered from the male screw portion 233 side of the extension member 23 so as to cover the torsion coil spring 25. The cover member 26 is a cylindrical member whose axial length is shorter than that of the large-diameter portion 231. One end of the cover member 26 is substantially open, and the other end is provided with a connection hole 261 having the same shape as the cross section of the male screw portion 233. . A spring fixing hole 262 is provided on the side surface of the cover member 26, and the other end of the torsion coil spring 25 is fixed to the spring fixing hole 262 by welding, for example. Thus, the torsion coil spring 25 is covered with the fixing base 24 and the cover 26.

  The torsion coil spring 25 has an inner diameter larger than the outer diameter of the large-diameter portion 231, an outer diameter smaller than the inner diameter of the cover 26, and the length of the coil in the axial direction from the portion exposed from the fixing base 24 of the large-diameter portion 231. Also has a short shape. As described above, the torsion coil spring 25 is configured such that one end is fixed to the fixing base 24 and the other end is fixed to the cover member 26 with the extension member 23 inserted therein, and the flow path 16 is closed. A biasing force that rotates the body 12 together with the stem 21 is generated.

  The handle 27 is formed in a crank shape, and a connecting hole 271 having the same shape as the cross section of the male screw portion 213 is provided at a base end portion thereof. Then, the male threaded portion 233 of the extension member 23 is inserted into the connecting hole 271 of the handle 27, and the male threaded portion 233 and the nut 29 are screwed and tightened via the spring washer 28, whereby the handle 27 is fixed to the extended member 23. Is done. The tip of the handle 27 is for gripping and turning by hand.

  The handle 27, the extension member 23, the cover 26, the rotation restricting member 22, the stem 21, the spring washer 28, and the nut 29 constitute the operation member 13, and the valve body 12 is integrated with the operation member 13 as the handle 27 is operated. And turn. In a state where no force is applied to the operation member 13 from the outside, the rotation restricting member 22 is pressed against the first rotation restricting projection by the urging force of the torsion coil spring 25 and is locked. Thereby, the communication path 12a of the valve body 12 becomes perpendicular to the secondary side flow path 10b, and the primary side flow path 10a and the secondary side flow path 10b are blocked. When the operating member 13 is turned 90 ° against the urging force of the torsion coil spring 25, the valve body 12 is also turned 90 ° in conjunction with it. The communication path 12a of the valve body 12 is parallel to the flow path 16, and the flow path 16 communicates. When the force applied to the operation member 13 is weakened from this state, the operation member 13 and the valve body 12 are pushed back by the biasing force of the torsion coil spring 25, and the rotation restricting member 22 is pressed against the first rotation restricting protrusion 201. The channel 16 is locked and the flow path 16 is automatically shut off.

  The valve body 11 is made of a metal such as brass (brass), bronze, stainless steel or the like. The valve body 11 uses these metals and is molded by a molding method such as a forging method or a casting method, but it is desirable to employ a forging method in order to improve mechanical properties such as impact resistance.

  Further, the valve body 12 is made of metal such as brass (brass), bronze, stainless steel or the like. Furthermore, in order to improve the corrosion resistance of such a valve body 12, it is preferable to perform coating by plating or resin. Alternatively, the valve body 12 may be formed of a resin having rigidity, preferably an engineering plastic.

  In this embodiment, the part including the rotation restricting member 22, the extending member 23, the fixing base 24, the torsion coil spring 25, and the cover 26 is configured by the valve body 11, the valve body 12, the stem 21, and the like. The ball valve can be provided as a ball valve attachment that can be added with a self-closing function later.

[Second Embodiment]
FIG. 4 shows a configuration of a fixing base 34 used in place of the fixing base 24 in the first embodiment in the ball valve according to the second embodiment of the present invention. Note that, in the configuration of the ball valve according to the second embodiment of the present invention, the components other than the fixed base 34 are the same as those in the first embodiment described above, and a description thereof will be omitted here.

  The fixed base 34 includes a base part 341 on a flat plate, an opening part 342 provided in the center of the base part 341 and through which the extension member 23 is inserted, and an outer edge part of the base part 341. A spring fixing portion 343 to which one end is fixed and a fixing portion 344 for fixing the base portion 341 to the valve body 11 are provided.

  The base portion 341 is fixed to the valve body 11 by the fixing portion 344 in a state where the large diameter portion 231 of the extension member 23 is passed through the opening 342. The fixing portion 344 is provided at the tip of the extending portion 345 that is extended and bent from the base portion 341 in two directions that coincide with the axial direction when the fixing portion 344 is installed on the valve body 11. And a clamp 346 for gripping. The clamp 346 includes a clamp body 347, a movable member 348, and a hinge 349. The clamp 346 can be opened and closed by connecting a movable member 348 from a hinge 349 to a clamp body 347 connected to the extending portion 345, and a clamp such as a hook provided at the end of the movable member 348 opposite to the hinge. (Not shown), the movable member 348 is fastened to the opposite end of the clamp body 347.

  The fixed base 34 is fixed to the valve body 11 by gripping the vicinity of the end portion in the axial direction of the valve body 11 by an annular portion formed in a state where the movable member 348 is fastened. An inner portion of the annular portion of the clamp 346 that contacts the valve body 11 is formed of an elastic material such as rubber. Since the fixing base 34 is fixed by gripping the valve body by the clamp 346, the fixing base 34 is prevented from rotating together with the operation portion by the force of operating the handle 27 to rotate the valve body 12, A self-closing function can be realized.

  Unlike the fixed base 24 of the first embodiment, which is welded and fixed to the bearing portion 20, the ball valve of the second embodiment that employs the fixed base 34 having a configuration including the clamp 346 has the fixed base 34 attached to the valve body 11. Easy to install. In particular, when a portion including the rotation restricting member 22, the extending member 23, the fixing base 34, the torsion coil spring 25, and the cover 26 is provided as an attachment for a ball valve attached later, additional processing such as welding is performed. And can be easily installed.

  The method of fixing the fixing base 34 to the valve body 11 with a clamp is not limited to the method using a hinge or a fastener as described above, and the annular portion may be fixed by screwing or the like.

[Third Embodiment]
FIG. 5 is a top view showing the configuration of the ball valve 5 according to the third embodiment of the present invention. The ball valve in this embodiment includes a valve body 11, a valve body 12, and a stem 21 that are common to the ball valve in the first embodiment. Since these members are the same as those in the first embodiment described above, description thereof is omitted here. The ball valve 5 in this embodiment further includes a movable handle 51, a fixed handle 52, and a torsion coil spring 53.

  The movable handle 51 is formed in a crank shape, and a base hole is provided with a connection hole having the same shape as the cross section of the male screw part 213 provided in the stem 21. The male screw part 213 is inserted into the connection hole and a spring washer is interposed. The fixed handle 51 is fixed to the stem 21 by screwing and tightening the male screw portion 213 and the nut.

  The fixed handle 52 is formed in a crank shape, and a base end portion thereof is fixed to the valve body 11 by, for example, welding. The direction in which the fixed handle 52 extends is substantially the same as the direction of the movable handle 51 when the ball valve is opened. The fixed handle 52 may be attached to the valve body 11 by a clamp or the like, like the fixed base 34 of the second embodiment.

  Different ends of the torsion coil spring 53 are connected to the longitudinal center portions of the movable handle 51 and the fixed handle 52, respectively. The torsion coil spring 53 urges the movable handle 51 to be pressed against the first rotation restricting protrusion 201 by a repulsive force from the compressed state. Therefore, when the operator does not touch the ball valve 5, the closed state where the flow path is blocked is obtained. When the angle formed by the movable handle 51 and the fixed handle 52 is reduced by grasping the movable handle 51 and the fixed handle 52 together, the valve body 12 is rotated together with the movable handle 51 so that the flow path 16 communicates with the open state. Become. When the force applied to the handle is loosened, the movable handle 51 returns to the state of being locked to the first rotation restricting projection 201 by the repulsive force of the torsion coil spring 53, and the self-closing function is realized.

[Modification of Embodiment]
FIG. 6 shows a modification of the fixing base 24 and the cover 26 in the first embodiment described above. 6A is a top view, and FIG. 6B is an external view. In addition, the arrow in FIG.6 (b) has shown the direction of the urging | biasing force by the torsion coil spring 25. FIG.

  In a state where the fixing base 24 and the cover 26 are attached to the valve main body 11, the rotation of the operation member 13 is restricted by the rotation restricting member 22 and the first rotation restricting protrusion 201, but is attached to the valve main body 11. If the rotation is not restricted when the torsion coil springs 25 are not restricted, the cover 26 is rotated with respect to the fixed base 24 by returning the torsion coil spring 25 to a no-load state, and the angle of the connecting hole 261 of the cover 26 is greatly shifted. Attachment to the valve body 11 is difficult.

  The fixing base 24 and the cover 26 in the present modified example are provided with the preliminary restricting portions 245 and 262 that restrict the rotation of the torsion coil spring 25 when not attached to the valve body 11, thereby solving the above problem. Yes. That is, the preliminary restricting portions 245 and 262 are engaged at an angle slightly rotated more than the angle (the two-dot chain line in FIG. 6) at which the rotation restricting member 22 and the first rotation restricting protrusion 201 are locked. It is provided to stop. That is, in a state where the fixed base 24 and the cover 26 are attached to the valve body 11, the rotation restricting member 22 and the first rotation restricting protrusion 201 rotate the operating member 13 (that is, rotate the cover 26 relative to the fixed base 24). Motion) is restricted and rotation of the cover 26 with respect to the fixed base 24 is restricted by the preliminary restricting portions 245 and 262 when the valve body 11 is not attached.

  Therefore, according to the fixed base 24 and the cover 26 of this modification, the angle deviation of the connecting hole 261 of the cover 26 is small between the state where it is attached to the valve body 11 and the state where it is not attached. Becomes easy. A similar configuration can be applied to the fixed base 34 of the second embodiment.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention. For example, in each of the above embodiments, the ball valve has been described as an example. However, it is obvious that the present invention can be applied to various valves that switch between the open state and the closed state of the flow path when the valve body rotates.

  The valve and the valve attachment of the present invention can realize a self-closing function with a simple mechanism, and can be expected to have effects such as prevention of forgetting to close the valve and reducing the burden on the operator.

DESCRIPTION OF SYMBOLS 1 Ball valve 11 Valve body 22 Rotation restriction member 23 Extension member 24 Fixing base 25 Torsion coil spring 26 Cover 27 Handle

Claims (6)

A cylindrical valve body with a flow path for circulating the transport fluid inside;
A spherical valve body that is rotatably supported on a flow path in the valve body, and has a communication passage communicating therewith;
An operating member connected to the valve body for rotating the valve body within the valve body;
A rotation restricting projection for restricting a rotation range of the operation member so that the flow path is closed when the operation member is locked with a part of the operation member;
A valve attachment that adds a self-closing function to a valve comprising:
A torsion coil spring that has one end fixed directly or indirectly to the valve body and applies a biasing force to the operation member so as to press the part of the operation member against the rotation restricting protrusion;
A valve attachment comprising: a cover member that covers the torsion coil spring and is fixed to the other end of the torsion coil spring so as to rotate with the operation member.   The said torsion coil spring is further provided with the fixing base fixed to the said valve body, and the one end of the said torsion coil spring is fixed, The said torsion coil spring is covered with the said fixing base and the said cover member, The Claim 1 characterized by the above-mentioned. Attachment for valves.   The valve attachment according to claim 2, wherein the fixing base includes a clamp that holds the valve main body.   The said cover member and the said fixing stand are provided with the preliminary control part which controls rotation of the said cover member with respect to the said fixing stand in the state in which the attachment for valves is not attached to the said valve. The valve attachment according to 3. A cylindrical valve body with a flow path for circulating the transport fluid inside;
A spherical valve body that is rotatably supported on a flow path in the valve body, and has a communication passage communicating therewith;
An operating member connected to the valve body and for rotating the valve body within the valve body by rotating integrally with the valve body;
A rotation restricting projection for restricting a rotation range of the operation member so that the flow path is closed when the operation member is locked with a part of the operation member;
A torsion coil in which one end is fixed directly or indirectly to the valve body, the other end is fixed to the operation member, and a biasing force is applied to the operation member so as to press the part of the operation member against the rotation restricting protrusion. A spring, and
The operating member is disposed through the torsion coil spring,
The operation member includes a cover member that covers the torsion coil spring and to which the other end of the torsion coil spring is fixed.   6. The torsion coil spring according to claim 5, further comprising a fixing base that is fixed to the valve body and to which one end of the torsion coil spring is fixed, and the fixing base and the cover member cover the torsion coil spring. valve.