JP4807554B2 - On-off valve with flow path - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an opening and closing valve with a flow channel capable of surely preventing loosening of a bush screwed on a valve main body, and preventing protrusion of the bush even when fluid pressure is rapidly applied. <P>SOLUTION: In this opening and closing valve with the flow channel having the valve main body 1 provided with a valve seat 9 on a bottom surface of a valve chest 8, and having a first flow channel 11 communicated with a communicating port 10 formed on the valve seat 9, and a second flow channel 12 communicated with the valve chest 8, a valve element 2 opening and closing a valve by being closely kept into contact with and separated from the valve seat 9, a bush 3 having a through hole 21 provided with a female screw portion 22 on its inner peripheral face, and a stem 4 engaged with the female screw portion 22 of the bush 3 and connected with the valve element 2 at its lower end portion, a circular projecting portion 14 is formed on an upper part of the valve main body 1, an inner peripheral face of the circular projecting portion 14 is provided with a female screw portion 15 engaged with the bush 3, an outer peripheral face of the circular projecting portion 14 is provided with a male screw portion 16 threaded in the direction opposite to the female screw portion 15, and a cap nut 6 through which the stem 4 can be penetrated, is engaged with the male screw portion 16. <P>COPYRIGHT: (C)2007,JPO&amp;INPIT

Description

  The present invention relates to a valve used in various industries such as a chemical factory or semiconductor manufacturing field, liquid crystal manufacturing field, food field, and more specifically, it can prevent loosening of a bush screwed to a valve body, The present invention relates to an on-off valve with a flow path that can prevent a bush from popping out even when sudden fluid pressure is applied.

  A conventional open / close valve with a flow path, particularly a open / close valve with a flow path, is provided with a diaphragm having a valve body at the upper part of a valve chamber where an inflow port and an outflow port communicate with each other. The valve is opened and closed by being pressed and separated, and a method of fixing the diaphragm to the upper portion of the valve chamber is generally configured such that the diaphragm is sandwiched and fixed by the valve body and the pressing member. It was. At this time, the diaphragm is clamped and fixed by clamping the diaphragm between the valve body and the pressing member and screwing the pressing member into the valve body, or holding the diaphragm and the pressing member between the valve body and the plug. Then, the method of fixing by plugging the plug into the valve body has been used.

  Further, the above-described conventional open / close valve with a flow path is also used as a needle valve having a diaphragm used to open / close a bypass flow path, for example, there is an open / close valve with a bypass flow path as shown in FIG. Reference 1). The configuration is such that a bypass flow path that connects the inflow side and the outflow side of the valve port 201 of the main flow path is opened in the body 202, and a needle valve 203 An annular step formed on the body 202 by a screw body in which a needle 204 of 203 and a diaphragm 205 protruding in the shape of a hook around the needle 204 are integrally formed of a fluorine-based resin, and an outer peripheral edge of the diaphragm 205 is screwed to the body 202 A protrusion 208 having a screw hole 207 formed on the side surface of the body 202 is protruded by pressing against the needle 204, and the flange 209 on the outer peripheral edge of the diaphragm 205 is connected to the annular step in the protrusion 208. 206, and the pressing member 210 is pressed against the back side thereof, and the plug 211 is screwed into the screw hole 207 of the projecting portion 208 to form a plug. 211 is intended to press the pressing member 210 at the tip of the one in which the diaphragm 205 and the holding member 210 for clamping fixed by the body 202 and the plug 211. The effect is that since there is no sliding part in the space in the accommodation hole defined by the diaphragm 205 integrally formed around the needle 204, wear powder is generated by friction of the sliding part and mixed into the fluid. In addition, since the needle 204 and the diaphragm 205 are made of a fluorine-based synthetic resin and have excellent corrosion resistance, the corrosion does not occur due to contact with the fluid used, and the corroded material does not enter the fluid. It is possible to prevent contamination by wear powder and corrosive substances.

Japanese Utility Model Publication No. 2-40365

  However, since the diaphragm 205 in the needle valve 203 is fixed only by screwing the body 202 and the plug 211 with the pressing member 210 interposed therebetween, for example, a foreign material or the like is attached to the screw rod 212 for opening and closing the needle valve 203. When the handle is rotated and the handle becomes heavy, the torque increases, and when the handle is rotated, the plug 211 is rotated along with the rotation of the screw rod 212, and the plug 211 is loosened so that the flange 209 of the diaphragm 205 is loosened. There is a possibility that fluid leakage from between the annular step 206 and deformation of the diaphragm 205 may occur. In addition, the plug 211 may come off and the presser member 210 cannot hold the diaphragm 205 and fluid may flow out. In addition, there is a problem that the plug 211 is loosened due to loosening of screw fixing due to repeated opening and closing operations or creep due to vibration or long-term use. Further, when used under a high pressure condition higher than expected and sudden pressure is applied to the inside, the screw may not withstand the internal pressure and may be damaged, and the plug 211 may pop out together with the fluid.

  As a method for preventing the plug 211 from loosening, a method such as bolt fixing, adhesion, welding, or welding other than screwing can be considered. However, in order to achieve a configuration that can be bolted while maintaining the strength, the parts must be enlarged, which hinders downsizing. In the bonding method, the body 202 and the plug 211 may be made of materials that cannot be bonded such as polytetrafluoroethylene (hereinafter referred to as PTFE) or may be bonded because they are made of different materials. Furthermore, in the case of welding and welding, there are problems that welding and welding are impossible because they are made of different materials, and deformation is likely to occur due to heat treatment. In addition, in the case of adhesion, welding, or welding, there is a disadvantage that the valve cannot be disassembled. Therefore, any of the above methods is not suitable as a method for preventing the plug 211 from loosening.

  The present invention has been made in view of the above problems of the prior art, and can reliably prevent the bush (plug 211) screwed into the valve body (body 202) from being loosened. Another object of the present invention is to provide an on-off valve with a flow path that can prevent the bush (plug 211) from popping out even when a sudden fluid pressure is applied.

The configuration of the on-off valve with flow passage of the present invention for solving the above problems will be described with reference to the drawings. A valve seat 9 is formed on the bottom surface of the valve chamber 8 and communicates with a communication port 10 provided in the valve seat 9. The valve main body 1 having the first flow path 11 and the second flow path 12 communicating with the valve chamber 8, the valve body 2 that opens and closes the valve by being pressed against and separated from the valve seat 9, and the female thread portion 22 on the inner peripheral surface In the on-off valve with flow passage having the bush 3 having the through-hole 21 in which is formed and the stem 4 screwed with the female screw portion 22 of the bush 3 and having the valve body 2 connected to the lower end portion thereof, the bush 3 is provided in the clockwise direction, the annular protrusion 14 is provided on the upper portion of the valve body 1, and the bush 3 is screwed onto the inner peripheral surface of the annular protrusion 14 in the clockwise direction. internal thread portion 15 having a screw, the internal thread portion 15 on the outer circumferential surface of the annular projection 14 Provided externally threaded portion 16 having an inverted direction screw respectively, the male screw portion 16 the stem 4 is made possible through without contact, underside bushing inner brim portion 33 provided on the upper portion of the cap nut 6 3 the top and the abutment to Rukoto the first aspect.

A valve body having a valve seat 9 formed on the bottom surface of the valve chamber 8 and having a first flow path 11 communicating with a communication port 10 provided at the center of the valve seat 9 and a second flow path 12 communicating with the valve chamber 8. 1, a valve body 2 that opens and closes a valve by being pressed against and separated from the valve seat 9, a bush 3 having a through hole 21 formed in the inner peripheral surface with a female screw portion 22 in the center, and a female screw portion 22 of the bush 3. In the on-off valve with a flow path having a stem 4 having a lower end connected to the valve body 2, an annular protrusion 14 is provided on the upper portion of the valve body 1, and the inner peripheral surface of the annular protrusion 14. Is provided with a female screw portion 15 into which the bush 3 is screwed, and a male screw portion provided on the outer peripheral surface of the annular protrusion 14 with a pitch of 1/6 to 5/6 of the pitch of the female screw portion 15. 16 is provided, and a cap is provided in which the stem 4 can pass through the male screw portion 16. That the nut 6 is screwed to the second feature.

  A diaphragm 17 extends in the radial direction of the valve body 2, and an annular locking portion 18 provided on the outer peripheral edge of the diaphragm 17 is provided with an annular recess 13 provided on the inner periphery of the annular protrusion 14 of the valve body 1. The third feature is that the valve body 1 and the lower portion of the bush 3 are clamped and fixed in a state of being fitted to the valve body.

Furthermore, it has a main valve chamber 55, a sub valve chamber 61, and an inlet channel 58 and an outlet channel 59 communicating with the main valve chamber 55, and is provided at a position substantially orthogonal to or substantially parallel to these channel axes. In the opened / closed valve with a flow path, a valve seat 62 is formed on the bottom surface of the sub valve chamber 61, and a communication port 63 provided in the center of the valve seat 62 communicates with the inlet flow path 58; A valve main body 52 having a secondary valve chamber 61 having a second flow path 65 communicating with the outlet flow path 59 or the main valve chamber 55; a secondary valve body 71 for opening and closing the valve by being pressed against and separated from the valve seat 62; A bush 75 having a through-hole 77 in which a female thread portion 78 having a screw in the clockwise direction is formed on the inner peripheral surface, and a female screw portion 78 of the bush 75 are screwed together. And a stem 81 to which a sub-valve element 71 is connected. Projections 67 are provided, internally threaded portion 68 on the inner peripheral surface of the annular projection 67 having a right rotation direction of the screw bushing 75 is screwed, and the internal thread portion 68 on the outer circumferential surface of the annular projection 67 opposite The male screw portions 69 having the direction screws are provided at different pitches, and the lower surface of the inner flange portion 92 provided on the upper portion of the cap nut 91 is formed so that the stem 81 can be penetrated without contacting the male screw portion 69. Is in contact with the upper surface of the bush 75 .

  In the on-off valve with flow passage according to the present invention, a female screw portion 15 in which the bush 3 is screwed to the inner peripheral surface of the annular protrusion 14 of the valve body 1 is opposite to the female screw portion 15 on the outer peripheral surface of the annular protrusion 14. The male screw portions 16 having the above-mentioned screws are respectively provided, and the cap nut 6 is screwed to the male screw portions 16. As a result, even if the bush 3 is about to be loosened, the cap nut 6 can be pressed to prevent the looseness. Further, even if the cap nut 6 rotates together with the rotation of the bush 3, the screw is in the reverse direction. Even if the bush 3 rotates in the loosening direction, the cap nut 6 rotates in the tightening direction, so that the cap nut 6 can be surely prevented from loosening of the bush 3 and not detached from the valve body 1. Further, if the cap nut 6 is attached with a screw in the reverse direction, it is possible to prevent the user from accidentally removing the component, and the accuracy of the component may be reduced due to disassembly, for example, an annular protrusion. This is preferable because the spring can be prevented from popping out in a case where a spring for preventing overtightening and loosening of the cap nut 6 is assembled between the cap 14 and the cap nut 6.

  In the on-off valve with flow passage of the present invention, the internal thread portion 44 in which the bush 37 is screwed to the inner peripheral surface of the annular protrusion 43 of the valve body 36 is different from the internal thread portion 44 on the outer peripheral surface of the annular protrusion 43. Male screw portions 45 provided at a pitch are provided, and a cap nut 38 having an inner flange portion 47 at the upper portion is screwed into the male screw portion 45. As a result, even if the bush 37 is about to be loosened, the cap nut 38 can be pressed to prevent the loosening. Further, even if the cap nut 38 rotates together with the rotation of the bush 37, for example, the pitch of the male screw portion 45 is reduced. Is set to be smaller than the female thread portion 44, the cap nut 38 and the bush 37 are fastened to each other because the cap nut 38 does not move as much as the amount of movement of the bush 37 due to the difference in the amount of movement in the axial direction during rotation. The rotation of the bush 37 can be prevented. In the case where the female screw portion 44 and the male screw portion 45 are provided at different pitches, the screws may be in the same direction or in the opposite direction.

  In the present invention, the pitch is a distance measured between two corresponding points of adjacent screw threads parallel to the axis in a cross section including the axis of the screw.

  Moreover, it is preferable that the pitch of the external thread part 45 in this invention exists in the range of 1/6-5/6 of the pitch of the internal thread part 44, 1.5 / 6 (1/4) -6 minutes Is more preferably in the range of 4.5 (3/4). In order to prevent the screw thread from being crushed due to a decrease in the strength of the screw portion and to prevent a decrease in the screwing strength, the pitch of the male screw portion 45 is 6 of the pitch of the female screw portion 44. It needs to be at least 1 / min. In order to prevent rotation by tightening each other due to the difference in the amount of movement of the bush 37 and the cap nut 38 in the axial direction when the cap nut 38 tries to rotate together when the bush 37 is about to rotate. The pitch of the male screw portion 45 needs to be 5/6 or less of the pitch of the female screw portion 44.

  Further, in the on-off valve with flow passage of the present invention, the diaphragm 17 extends in the radial direction of the valve body 2, and the annular locking portion 18 provided on the outer peripheral edge of the diaphragm 17 is the annular protrusion 14 of the valve body 1. It is desirable to have a configuration in which the valve body 1 and the bush 3 lower part are sandwiched and fixed in a state of being fitted into an annular recess 13 provided on the inner periphery. This is because the diaphragm 17 receives the pressure of the fluid, and the bush 3 is screwed with the valve body 1 to clamp and fix the diaphragm 17 so that it is used under a higher pressure condition than expected. Even if a sudden pressure is applied to the bush 3, the internal pressure is transmitted to the bush 3 through the diaphragm 17. However, according to the configuration of the present invention, in addition to holding the bush 3 by fixing the screw to the bush 3, By holding by screw fixing, a holding force against the internal pressure by both the bush 3 and the cap nut 6 can be obtained, and it is possible to prevent the bush 3 from popping out even when a sudden pressure is applied. is there.

  Moreover, the on-off valve with flow path of the present invention is substantially orthogonal or substantially parallel to the flow path axis of the valve body 52 having the main valve chamber 55 and the inlet flow path 58 and the outlet flow path 59 communicating with the main valve chamber 55. In this case, the bypass valve 70 is used. At this time, in the bypass valve 70, a valve seat 62 is formed on the bottom surface of the sub-valve chamber 61, a first flow path 64 in which a communication port 63 provided in the center of the valve seat 62 communicates with the inlet flow path 58, and a sub-valve chamber. 61 has a second flow path 65 communicating with the outlet flow path 59 or the main valve chamber 55. Here, the position of the bypass valve 70 may be provided at a position substantially orthogonal to the flow path axis of the valve body 52 or may be provided at a position substantially parallel to the flow path axis of the valve body 52. Further, the second flow path 65 of the bypass valve 70 may be configured such that the sub valve chamber 61 and the outlet flow path 59 communicate with each other, or may be configured such that the sub valve chamber 61 and the main valve chamber 55 communicate with each other. good. When used as the bypass valve 70, the components of the bypass valve 70 need to be small, and since each screw portion is also small, the strength by screw fixing is not so high, and the screw is likely to loosen. However, since the cap nut 91 is attached with a screw opposite to the bush 75 as in the present invention, the cap nut 91 can be prevented from being loosened even if the bush 75 is loosened by repeated opening / closing and vibration. Further, even if the cap nut 91 tries to rotate together with the rotation of the bush 75, the cap nut 91 rotates in the tightening direction, so that the cap nut 91 reliably prevents the bush 75 from loosening, and the valve body 52. You can prevent it from coming off. Moreover, since the holding force with respect to the internal pressure by both the bush 75 and the cap nut 91 can be obtained, it is preferable because the bush 75 can be prevented from flying even when a sudden pressure is applied.

  The type of the on-off valve with flow path in the present invention is not particularly limited, such as a diaphragm valve, a stop valve, and a needle valve, but is preferably a diaphragm valve. When the on-off valve with flow passage of the present invention is used as the bypass valve 70, the configuration of the valve main body 52 having the bypass flow passage includes a main valve chamber 55, an inlet flow passage 58 communicating with the main valve chamber 55, and an outlet flow passage. If it has 59, it will not specifically limit, The drive of a valve may be any structure, such as a manual type, a pneumatic type, an electric type, and a magnetic type.

  The material of each part of the on-off valve with flow path of the present invention is not particularly limited, and examples thereof include polypropylene (hereinafter referred to as PP), polyethylene, polystyrene, polyvinyl chloride, ABS resin, and fluororesin. The wetted parts such as the main body 1 and the valve body 2 are resistant to corrosion and have repeated fatigue characteristics if made of fluororesin such as PTFE, polyvinylidene fluoride, tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, and PCTFE. It is suitable because it is good.

The present invention has the structure as described above, and the following excellent effects can be obtained.
(1) The internal thread of the annular projection of the valve body is provided with a female thread, and the outer circumference of the annular projection is provided with a male thread having a thread opposite to the female thread. However, the cap nut can be prevented from loosening, and the cap nut will rotate together with the rotation of the bush, or the cap nut will rotate in the tightening direction even if the bush rotates in the loosening direction. It is possible to reliably prevent the bush from being loosened and not to be detached from the valve body.
(2) Since the internal thread surface of the annular projection of the valve body is provided with a female thread portion, and the external thread surface of the annular projection portion is provided with a male thread portion provided at a different pitch from the external thread portion, the bush is loosened. The cap nut can be pressed to prevent it from coming loose, and even if the cap nut tries to rotate with the rotation of the bush, the cap nut and the bush are tightened together due to the difference in the amount of axial movement during rotation. Therefore, rotation of the bush can be prevented.
(3) With respect to the internal pressure applied to the bush, in addition to the holding of the bush by screw fixing, the holding of the cap nut by screw fixing is performed, thereby obtaining the holding force against the internal pressure by both the bush and the cap nut. It is possible to prevent the bush from popping out even when sudden pressure is applied.
(4) By using the open / close valve with flow path of the present invention as a bypass valve, the cap nut can be prevented from being loosened by repeated opening / closing or vibration, so that the cap nut can be prevented from being loosened. Even if the cap nut rotates together with the cap nut, the cap nut rotates in the tightening direction, so that the cap nut can be surely prevented from loosening of the bush and prevented from coming off the valve body. Since the holding force with respect to the internal pressure by both of the cap nuts can be obtained, the bush can be used without popping out even if a sudden pressure is applied.

  Hereinafter, embodiments of the present invention will be described with reference to the embodiments shown in the drawings. However, it is needless to say that the present invention is not limited to the embodiments. FIG. 1 is a longitudinal sectional view showing a first embodiment of the on-off valve with flow passage according to the present invention. FIG. 2 is an enlarged longitudinal sectional view showing a principal part of a second embodiment of the on-off valve with flow passage according to the present invention. FIG. 3 is a longitudinal sectional view showing a third embodiment of the on-off valve with flow passage according to the present invention. 4 is an enlarged vertical sectional view of the main part of FIG. FIG. 5 is a longitudinal sectional view of FIG. 3 viewed from the right side. 6 is a longitudinal sectional view showing the diaphragm valve of FIG. 3 in a closed state and the bypass valve in an open state.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIG.

  Reference numeral 1 denotes a PTFE valve body. On the upper part of the valve body 1, an annular protrusion 14 projecting upward, and an internal thread 15 is provided on the inner peripheral surface of the annular protrusion 14, and an external thread having a screw in the opposite direction to the internal thread 15 on the outer peripheral surface. A portion 16 is provided. On the inner periphery of the annular protrusion 14, there is an annular recess 13 into which the annular locking portion 18 of the valve body 2 described later is fitted. A substantially mortar-shaped valve chamber 8 formed with the inner peripheral wall of the annular recess 13 and the diaphragm 17 of the valve body 2 described later is provided on the upper surface of the annular protrusion 14. A communication port 10 is provided at the bottom of the valve chamber 8, and a first flow channel 11 that communicates with the communication port 10 and a second flow channel 12 that communicates with the valve chamber 8 are provided. The opening of the communication port 10 is provided in the center of the bottom of the valve chamber 8, and the peripheral edge of the opening is a valve seat 9.

  2 is a PTFE valve body. A projecting portion 19 having a T-shaped cross section is provided on the upper portion of the valve body 2, and is fitted to a notch portion 26 of the stem 4 to be rotatable. That is, the valve body 2 can move up and down as the stem 4 rotates, and is pressed against and separated from the valve seat 9 of the valve body 1 so that the fluid flowing from the first flow path 11 to the second flow path 12 can be removed. Closing or opening is performed. Further, a diaphragm 17 extending in the radial direction is provided on the outer periphery of the valve body 2. Further, an annular locking portion 18 is provided on the outer peripheral edge of the diaphragm 17, and is sandwiched and fixed between the valve body 1 and the lower portion of the bush 3 described later while being fitted in the annular recess 13 of the valve body 1.

  Reference numeral 3 denotes a PP bush, which has a male screw portion 20 on its outer peripheral surface, and is screwed with a female screw portion 15 provided on the inner peripheral surface of the annular protrusion 14 of the valve body 1. A through hole 21 is provided at the center of the bush 3, a female screw portion 22 is provided on the inner peripheral surface of the through hole 21, and the annular locking portion 18 of the valve body 2 is provided at the lower portion of the bush 3. An annular protrusion 23 that presses against the valve body 1 is formed, and a recess 24 is formed on the inner periphery of the lower portion.

  4 is a stem made of PP, and a flange portion 25 is provided at the lower portion, and a notch portion 26 into which the T-shaped protrusion 19 of the valve body 2 is rotatably fitted is provided in the flange portion 25. It has been. A male screw portion 27 is provided on the outer peripheral surface of the central portion of the stem 4 to be screwed with a female screw portion 22 provided on the inner peripheral surface of the bush 3, a convex portion 28 is provided on the upper portion, and a female screw portion is provided on the upper inner peripheral surface. 29 is provided.

  Reference numeral 5 denotes a PP handle. A through hole 31 is provided in the center, a concave portion 30 is formed on the inner periphery of the lower portion to be fitted with the convex portion 28 of the stem 4, and the bolt 32 is inserted into the stem 4 through the through hole 31. The stem 4 is fixed to the stem 4 so as not to rotate by being screwed into the upper female screw portion 29 and sandwiching the handle 5.

  Reference numeral 6 denotes a cap nut made of PP, and an inner flange portion 33 is provided on the upper portion, and a lower surface of the inner flange portion 33 is provided so as to contact the upper surface of the bush 3. On the inner peripheral surface of the lower portion of the cap nut 6, a female screw portion 34 that is screwed with the male screw portion 16 provided on the annular protrusion 14 of the valve body 1 is provided.

  Reference numeral 7 denotes a PP lock nut having a female screw portion 35 on the inner peripheral surface thereof, screwed into the male screw portion 27 of the stem 4, and disposed between the handle 5 and the cap nut 6.

  Next, the opening / closing operation of this embodiment will be described.

  First, when closing the valve, the handle 5 is rotated clockwise. The stem 4 fixed so as not to rotate with respect to the handle 5 is lowered while rotating clockwise together with the handle 5 by the action of the male screw portion 27 provided on the outer peripheral surface. At this time, the annular locking portion 18 of the valve body 2 is clamped and fixed between the valve body 1 and the bush 3, and the central upper portion is rotatably held by the lower portion of the stem 4, so that the stem 4 rotates. The valve body 2 and the diaphragm 17 can be lowered without rotating, and the valve body 2 is pressed against the valve seat 9 of the valve body 1 to close the communication port 10 and the valve is closed.

  Next, when opening the valve, the handle 5 is rotated to the left. The stem 4 is rotated counterclockwise by the action opposite to that at the time of closing, so that the valve body 2 is raised, the valve body 2 and the valve seat 9 are separated from each other, and the valve is opened. Further, when the upper surface of the flange portion 25 at the lower portion of the stem 4 is raised until it comes into contact with the bottom surface of the concave portion 24 at the inner periphery of the lower portion of the bush 3, the rotational increase of the stem 4 is suppressed and becomes the upper limit of the valve opening.

  In addition, when it is desired to fix the valve opening while maintaining the desired valve opening, the rotation of the stem 4 is suppressed by rotating the lock nut 7 and pressing and fixing the lower surface to the upper surface of the cap nut 6. Done. When changing the valve opening, the lock nut 7 is once loosened, the valve opening is readjusted, and then the lock nut 7 is rotated and fixed again to maintain the desired valve opening.

  Next, the function of preventing the loosening of the bush in this embodiment will be described.

  When the valve is opened and closed, when a foreign object bites into the male threaded portion 27 on the outer peripheral surface of the stem 4 and the handle 5 becomes heavy, the rotational torque of the stem 4 increases. When the stem 4 is rotated by rotating the handle 5 with a large torque, the bush 3 also rotates together with the rotation of the stem 4, but the inner flange portion 33 of the cap nut 6 presses the upper portion of the bush 3. When the bush 3 rotates and moves axially away from the valve body 1, the upper surface of the bush 3 comes into contact with the lower surface of the inner flange portion 33 of the cap nut 6, and the bush 3 The loosening of the bush 3 is prevented by preventing the movement and the rotation. Further, even when the cap nut 6 tries to rotate together with the rotation of the bush 3, the cap nut 6 is formed with a screw in the opposite direction to the bush 3, and the bush 3 is rotated in the loosening direction. In addition, since the cap nut 6 rotates in the tightening direction, the cap nut 6 does not come off, so that the cap nut 6 can be surely prevented from loosening the bush 3 and not come off from the valve body 1. In addition, not only when the rotational torque is high, but also when the bush 3 is loosened due to repeated opening and closing of the valve, the loosening of the bush 3 can be similarly prevented.

  If the valve chamber 8 is used under a high pressure condition higher than expected and sudden pressure is applied, the internal pressure is transmitted to the bush 3 via the diaphragm 17, but the inner flange portion 33 of the cap nut 6. The cap nut 6 and the bush 3 are respectively screwed with the valve body 1 so that the internal pressure is held by fixing the bush 3 with screws. In addition to this, since the cap nut 6 is held by screw fixing, a holding force against the internal pressure by both the bush 3 and the cap nut 6 can be obtained, and the bush 3 pops out even when a sudden pressure is applied. Can be prevented.

  Further, the screw nut is loosened due to vibration due to fluid flow or creep due to long-term use, and the cap nut 6 tries to turn in the reverse tightening direction even if the bush 3 tries to turn in the loosening direction. Looseness can be prevented.

  Hereinafter, a second embodiment of the on-off valve with flow passage according to the present invention will be described with reference to FIG.

  Reference numeral 36 denotes a PTFE valve body. An upper portion of the valve main body 36 has an annular protrusion 43 protruding upward, and an internal thread portion 44 is provided on the inner peripheral surface of the annular protrusion portion 43. A male screw portion 45 having a screw with a pitch of 2 is provided. On the inner periphery of the annular protrusion 43, there is an annular recess 42 into which the annular locking portion 41 of the valve body 40 is fitted. On the upper surface, a substantially mortar-shaped valve chamber 39 formed with the inner peripheral wall of the annular recess 42 and the diaphragm of the valve body 40 is provided.

  Reference numeral 37 denotes a PP bush, which has a male screw portion 46 on the outer peripheral surface and is screwed with a female screw portion 44 provided on the inner peripheral surface of the annular projection 43 of the valve body 36.

  Reference numeral 38 denotes a cap nut, which is provided with an inner flange portion 47 at the upper portion, and the inner flange portion 47 is provided so as to come into contact with the upper portion of the bush 37. A female screw portion 48 that is screwed with a male screw portion 45 provided on the annular projection 43 of the valve body 36 is provided on the lower inner peripheral surface of the cap nut 38. The other configuration of the second embodiment is the same as that of the first embodiment, and thus the description thereof is omitted.

  Since the operation of the valve according to the second embodiment of the present invention is the same as that of the first embodiment, the description thereof is omitted. Next, the function of preventing the loosening of the bush according to the second embodiment will be described.

  When the valve is opened and closed, foreign matter bites into the male threaded portion 50 on the outer peripheral surface of the stem 49, and the rotational operation of the handle 51 becomes heavy, the rotational torque of the stem 49 increases. When the handle 51 is rotated with a large torque to rotate the stem 49, the bush 37 also rotates together with the rotation of the stem 49, but the inner flange portion 47 of the cap nut 38 holds the upper portion of the bush 37. When the bush 37 rotates and moves axially away from the valve body 36, the upper surface of the bush 37 comes into contact with the lower surface of the inner flange portion 47 of the cap nut 38, and the bush 37 The loosening of the bush 37 is prevented by the movement being suppressed and the rotation being impossible. Further, even when the cap nut 38 tries to rotate together with the rotation of the bush 37, the pitch of the male screw portion 45 of the annular protrusion 43 to which the female screw portion 48 of the cap nut 38 is screwed is determined as follows. 37 is formed so as to be two-thirds of the pitch of the female thread portion 44 of the annular projection 43 to which the screw 37 is screwed. For example, when the bush 37 rotates once and moves 1.5 mm in the axial direction, the cap The nut 38 moves only 1 mm. Due to the difference in the amount of movement, the upper surface of the bush 37 presses the lower surface of the inner flange portion 47 of the cap nut 38 so that the cap nut 38 and the bush 37 are tightened together. Since the movement of the bush 37 is suppressed and the rotation becomes impossible, the loosening of the bush 37 is prevented. In addition, not only when the rotational torque is high, but also when the bush 37 is loosened by repeated opening and closing of the valve, the loosening of the bush 37 can be prevented in the same manner.

  It should be noted that, in the unlikely event that the valve chamber 39 is used under a high-pressure condition higher than expected and an abrupt pressure is applied to the valve chamber 39, vibration due to the flow of fluid, etc., or creep due to long-term use, etc. The description is omitted because it is similar.

  Hereinafter, an embodiment in which the on-off valve with flow passage of the present invention is used as a bypass valve will be described with reference to FIGS.

  52 is a PTFE valve body. An upper portion of the valve body 52 has an annular protrusion 53 joined to a lower portion of the cylinder body 102 described later, and an annular groove 54 on the inner periphery of the annular protrusion 53. A main valve chamber 55 formed with an inner peripheral wall of the annular groove 54 and a diaphragm portion 97 described later is provided on the upper surface. Communication ports 56 and 57 are provided at the bottom of the main valve chamber 55, the communication port 56 communicates with the inlet channel 58, and the communication port 57 communicates with the outlet channel 59. The opening of the communication port 56 is provided at the center of the bottom of the main valve chamber 55, and the peripheral edge of the opening is the valve seat 60. In addition, a sub valve chamber 61 that functions as a bypass valve 70 is provided at a position substantially orthogonal to the inlet flow path 58 of the valve body 52 so as to open to the side surface of the valve body 52. A valve seat 62 is formed on the bottom surface of the sub valve chamber 61, a communication port 63 is provided in the center of the valve seat 62, a first channel 64 that communicates with the inlet channel 58, and a sub valve chamber. A second flow path 65 is provided in which 61 communicates with the main valve chamber 55. An annular recess 66 into which an annular locking portion 73 of a later-described auxiliary valve body 71 is fitted on the outer edge of the auxiliary valve chamber 61, and an annular protrusion 67 that protrudes along the axis of the auxiliary valve chamber 61 on the outer periphery of the annular recess 66. Is provided. A female screw portion 68 is provided on the inner peripheral surface of the annular protrusion 67, and a male screw portion 69 having a screw in a direction opposite to that of the female screw portion 68 is provided on the outer peripheral surface.

  Reference numeral 70 denotes a bypass valve that opens and closes a bypass flow path that flows from the first flow path 64 to the second flow path 65 through the sub valve chamber 61. The bypass valve 70 includes a valve main body 52, a sub valve body 71, a bush 75, a stem 81, a handle 87, a cap nut 91, and a lock nut 94. The configuration of the bypass valve 70 will be described below.

  71 is a secondary valve body made of PTFE. A projecting portion 74 having a T-shaped cross section is provided at the end of the sub-valve body 71 opposite to the valve body portion, and is fitted to a notch portion 83 of a stem 81 to be described later. That is, the sub-valve body 71 moves up and down (left and right movement along the axis of the sub-valve chamber 61 in FIGS. 3, 4, and 6) due to the rotation of the stem 81. 6 is movable to the left and right), and is pressed against and separated from the valve seat 62 of the valve body 52, and the fluid flowing from the first flow path 64 to the second flow path 65 is closed or opened. A diaphragm 72 extending in the radial direction is provided on the outer periphery of the sub valve body 71. Further, an annular locking portion 73 is provided on the outer peripheral edge of the diaphragm 72 and is sandwiched and fixed between the valve main body 52 and a lower portion of the bush 75 described later while being fitted in the annular concave portion 66 of the valve main body 52.

  Reference numeral 75 denotes a PP bush, which has a male threaded portion 76 on its outer peripheral surface, and is screwed with a female threaded portion 68 provided on the inner peripheral surface of the annular projection 67 of the valve body 52. A through hole 77 is provided at the center of the bush 75, a female threaded portion 78 is provided at the upper inner peripheral surface of the through hole 77, and the auxiliary valve body 71 is connected to the valve body 52 at the lower part of the bush 75. An annular protrusion 79 is formed to be clamped and fixed, and a recess 80 is formed on the inner periphery of the end portion on the side of the auxiliary valve chamber 61.

  81 is a stem made of PP, and a stem 82 is provided at the end of the stem 81 on the side of the sub-valve chamber 61, and a T-shaped projection 74 of the sub-valve element 71 is turned inside the collar 82. A notch 83 that is freely fitted is provided. On the outer peripheral surface of the central portion of the stem 81, a male screw portion 84 that is screwed with a female screw portion 78 provided on the inner peripheral surface of the bush 75 is provided. A convex portion 85 is provided at the other end portion of the stem 81, and a female screw portion 86 is provided at the inner peripheral surface.

  Reference numeral 87 denotes a PP handle. A concave portion 88 that fits the convex portion 85 of the stem 81 is formed at one end portion, a through hole 89 is provided at the center, and a bolt 90 passes through the through hole 89. The stem 81 is fixed to the stem 81 so as not to rotate by screwing with the female screw portion 86 and holding the handle 87.

  91 is a cap nut made of PP, and an inner collar portion 92 is provided at one end portion, and the inner collar portion 92 is provided so as to contact the bush 75. On the inner peripheral surface of the other end portion of the cap nut 91, a female screw portion 93 that is screwed with a male screw portion 69 provided on the annular projection 67 of the valve body 52 is provided.

  Reference numeral 94 denotes a PP lock nut having a female screw portion 95 on the inner peripheral surface thereof, screwed into the male screw portion 84 of the stem 81, and positioned between the handle 87 and the cap nut 91.

  A diaphragm valve 96 opens and closes an inlet channel 58 and an outlet channel 59 that communicate with the main valve chamber 55. The diaphragm valve 96 includes a valve main body 52, a diaphragm portion 97, a cylinder main body 102, a piston 108, and a diaphragm retainer 113. The configuration of the diaphragm valve will be described below.

  Reference numeral 97 denotes a PTFE diaphragm portion located above the main valve chamber 55. A central valve body 98 is formed in which the upper center portion of the diaphragm portion 97 is received by the insertion portion 114 of the diaphragm retainer 113 and the lower surface thereof is pressed against and separated from the valve seat portion 60. A female screw part 99 is provided on the upper part of the main valve body 98 and is screwed to the male screw part 111 at the lower end of a shaft part 112 of the piston 108 described later. That is, the main valve body 98 can move up and down as the piston 108 moves up and down and is pressed against and separated from the valve seat portion 60 of the valve body 52 to close the flow path from the inlet flow path 58 to the outlet flow path 59. Opening takes place. A diaphragm portion 100 extending in the radial direction is provided on the outer periphery of the main valve body 98. Further, an annular fitting portion 101 having a rectangular cross section is provided on the outer peripheral edge of the diaphragm portion 100, and is sandwiched and fixed between the valve body 52 and the lower surface of the diaphragm retainer 113, which is fitted in the annular groove 54 of the valve body 52. ing.

  Reference numeral 102 denotes a PP cylinder body, which is fixed to the upper portion of the valve body 52 by bolts and nuts (not shown). An upper space 103 and a lower space 104 are formed in a staircase shape inside the cylinder main body 102, and a fitting portion 105 for a diaphragm retainer 113 is provided at the lower portion. A first working fluid supply port 106 communicating with 103 and a second working fluid supply port 107 communicating with the lower space 104 are formed. Note that a spring for urging the piston 108 in the downward direction may be provided in the upper space 103 of the cylinder body 102, and in this case, it can be used as a reverse operation valve.

  Reference numeral 108 denotes a PP piston, and an upper peripheral surface is provided with a flange 110 having an annular groove 109 for holding an O-ring on the upper outer peripheral surface, and an inner peripheral surface of the lower space 104 of the cylinder body 102. Are slidable up and down. Below, an O-ring is fitted, and a shaft portion 112 in which a male screw portion 111 is formed to be screwed into a female screw portion 99 of a diaphragm portion 97 at a lower end portion passes through a through hole 115 of a diaphragm retainer 113 described later. In this state, it is integrally provided by hanging from the center of the collar portion 110.

  Reference numeral 113 denotes a PP diaphragm retainer, and an insertion part 114 is formed below the diaphragm retainer. The upper portion of the diaphragm portion 97 is received in the insertion portion 114. A through hole 115 into which the shaft portion 112 of the piston 108 is inserted is formed at the center of the upper surface of the insertion portion 114, and a tapered portion 116 having a diameter reduced toward the insertion portion 114 is provided on the lower surface of the diaphragm holder 113. An O-ring 117 is disposed on the outer periphery of the diaphragm retainer 113. An annular protrusion 118 is formed on the lower outer peripheral surface, and is inserted into the fitting portion 105 of the cylinder body 102.

  Next, the operation when this embodiment is used as a bypass valve will be described.

  First, the operation of the diaphragm valve 96 will be described. When the bypass valve 70 is in the closed state and the diaphragm valve 96 is in the closed state, the main valve body 98 of the diaphragm valve 96 is pressed against the valve seat portion 60 to close the flow path. When air as working fluid is injected into the second working fluid supply port 107 from this state, air is injected into the lower space 104 formed between the piston 108 and the diaphragm retainer 113, and the piston 108 is pushed up by the pressure of the air. Therefore, the main valve body 98 connected to the piston 108 is also separated from the valve seat portion 60 and pulled upward to open the diaphragm valve 96 (the state shown in FIGS. 3 and 5), and the fluid flows into the inlet channel 58. From the outlet port 59 after passing through the communication port 56, the main valve chamber 55, and the communication port 57. When the diaphragm valve 96 is in the open state (the state shown in FIGS. 3 and 5), when air as the working fluid is injected into the first working fluid supply port 106 from this state, the upper portion of the piston 108 and the inner peripheral surface of the cylinder body 102 are formed. Since the air is injected into the upper space 103 and the piston 108 is pushed down by the pressure of the air, the main valve body 98 connected to the piston 108 is also pushed down and pressed against the valve seat 60, so that the diaphragm valve Closed.

  Next, the operation of the bypass valve 70 will be described. When opening the bypass valve 70, the handle 87 is rotated counterclockwise. The stem 81 fixed to the handle 87 so as not to rotate is raised (moved in the handle direction) while rotating counterclockwise simultaneously with the handle 87 by the action of the male screw portion 84 provided on the outer peripheral surface. At this time, the secondary valve body 71 has the annular locking portion 73 sandwiched and fixed between the valve main body 52 and the bush 75, and is held rotatably at the end of the stem 81, so that the stem 81 rotates. However, the auxiliary valve body 71 and the diaphragm 72 can rise without rotating, and the auxiliary valve body 71 is separated from the valve seat 62 of the auxiliary valve chamber 61 of the valve body 52 to open the communication port 63 and bypass. The valve 70 is opened (state shown in FIG. 6). The fluid that has flowed in from the inlet flow path 58 closed by the main valve element 98 of the diaphragm valve 96 flows into the sub valve chamber 61 through the first flow path 64, and passes through the second flow path 65 from the sub valve chamber 61. Flows into the main valve chamber 55 and flows out from the main valve chamber 55 through the outlet passage 59. At this time, the bypass valve 70 is formed smaller than the diaphragm valve 96, and the valve opening degree can be finely adjusted. Therefore, the fluid flowing from the inlet passage 58 is adjusted to a minute flow rate by the bypass valve 70. It flows out from the outlet channel 59.

  Further, when fixing in a state in which the desired valve opening degree is maintained, the lock nut 94 is rotated and the lower surface is pressed against and fixed to the upper surface of the cap nut 91 to suppress the rotation of the stem 81, thereby fixing the valve opening degree. Done. When changing the valve opening, the lock nut 94 is once loosened, the valve opening is readjusted, and then the lock nut 94 is rotated and fixed again to maintain the valve opening. Thereby, the fluid flow volume adjusted slightly can be hold | maintained.

  When closing the bypass valve 70, the handle 87 is rotated to the right. The stem 81 is also rotated to the right by the action opposite to that at the time of opening, and the sub-valve element 71 is lowered, the sub-valve element 71 is pressed against the valve seat 62 and the valve is closed.

  With the above configuration, when the diaphragm valve 96 needs to be adjusted to a minute flow rate, the minute flow rate can be easily adjusted and maintained by using the bypass valve 70. Thereby, the diaphragm valve 96 can be closed and the valve opening degree of the bypass valve 70 can be adjusted to perform a slow leak of the fluid, and the amount thereof can be easily changed manually. The bypass valve 70 is preferably used in a chemical liquid line or a pure water line, and can be used in a state where a fluid is always flowed by performing a slow leak, thereby preventing the growth of bacteria and the like.

  Next, the function of preventing the loosening of the bush in this embodiment will be described.

  Since the bypass valve 70 adjusts a minute flow rate, its component parts need to be smaller than the diaphragm valve 96. Therefore, the thread portion of each component of the bypass valve 70 is formed in a small size. When the threaded portion becomes small, the strength of the threaded portion is lowered, and crushing and deformation are likely to occur. When the male screw portion 84 on the outer peripheral surface of the stem 81 is deformed when the valve is opened and closed, and the rotational operation of the handle 87 becomes hard, the rotational torque of the stem 81 increases. When the handle 87 is rotated with a large torque to rotate the stem 81, the bush 75 also rotates together with the rotation of the stem 81, but the inner flange portion 92 of the cap nut 91 presses the upper portion of the bush 75. When the bush 75 rotates and moves axially away from the valve body 52, the upper surface of the bush 75 comes into contact with the lower surface of the inner flange portion 92 of the cap nut 91, and the bush 75 The loosening of the bush 75 is prevented by preventing the movement and the rotation. Further, even when the cap nut 91 tries to rotate together with the rotation of the bush 75, the cap nut 91 is formed with a screw in the opposite direction to the bush 75, and the bush 75 rotates in the loosening direction. In addition, since the cap nut 91 rotates in the tightening direction, the cap nut 91 does not come off, and the cap nut 91 can reliably prevent the bush 75 from loosening and not come off from the valve body 52. Not only when the rotational torque is high, but also when the bush 75 is loosened by repeated opening and closing of the valve, the loosening of the bush 75 can be prevented in the same manner.

  Also, if a sudden pressure is applied to the sub valve chamber 61 of the bypass valve 70 when used under a higher pressure than expected, the internal pressure is transmitted to the bush 75 via the diaphragm 72. The small threaded part of each component reduces the strength of the threaded part and increases the possibility of breakage without being able to withstand the pressure. However, the lower surface of the inner flange 33 of the cap nut 91 is in contact with the upper surface of the bush 3. Since the cap nut 91 and the bush 75 are screwed to the valve body 52, the cap nut 91 is screwed against the internal pressure in addition to holding the bush 75 by screwing. By holding by fixing, it is possible to obtain a holding force against the internal pressure by both the bush 75 and the cap nut 91, and it is possible to prevent the bush 75 from popping out even when a sudden pressure is applied.

  In addition, even when the screw is loosened due to vibration due to fluid flow or creep due to long-term use, the cap nut 91 tends to turn in the reverse tightening direction even if the bush 75 tries to turn in the loosening direction. Therefore, loosening of the bush 75 can be prevented.

It is a longitudinal cross-sectional view which shows the 1st Example of the on-off valve with a flow path which concerns on this invention. It is a principal part expanded vertical sectional view which shows the 2nd Example of the on-off valve with a flow path which concerns on this invention. It is a longitudinal cross-sectional view which shows the 3rd Example of the on-off valve with a flow path which concerns on this invention. FIG. 4 is an enlarged vertical sectional view of a main part of FIG. 3. It is the longitudinal cross-sectional view which looked at FIG. 3 from the right side surface. FIG. 4 is a longitudinal sectional view showing a state where the diaphragm valve of FIG. 3 is closed and the bypass valve is opened. It is a longitudinal cross-sectional view which shows the conventional on-off valve with a bypass flow path.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Valve body 2 ... Valve body 3 ... Bush 4 ... Stem 5 ... Handle 6 ... Cap nut 7 ... Lock nut 8 ... Valve chamber 9 ... Valve seat 10 ... Communication port 11 ... First flow path 12 ... Second flow path 14 ... Annular projection 15 ... female thread 16 ... male thread 17 ... diaphragm 18 ... annular locking part 20 ... male thread 22 ... female thread 27 ... male thread 33 ... inner flange 34 ... female thread 36 ... valve body 37 ... bush 38 ... Cap nut 39 ... Valve chamber 40 ... Valve body 43 ... Annular projection 44 ... Female screw portion 45 ... Male screw portion 49 ... Stem 51 ... Handle 52 ... Valve body 55 ... Main valve chamber 56 ... Communication port 57 ... Communication port 58 ... Inlet flow Path 59 ... Exit channel 60 ... Valve seat 61 ... Sub valve chamber 62 ... Valve seat 63 ... Communication port 64 ... First channel 65 ... Second channel 67 ... Ring projection 68 ... Female thread 69 ... Male thread 70 ... Bypass valve 71 ... Sub valve body 72 ... Diaphragm 7 ... Bush 78 ... Female thread 81 ... Stem 84 ... Male thread 87 ... Handle 91 ... Cap nut 92 ... Inner collar 93 ... Female thread 94 ... Lock nut 97 ... Diaphragm 98 ... Main valve body 102 ... Cylinder body 108 ... Piston 113 ... diaphragm foot

Claims (4)

A valve seat is formed on the bottom surface of the valve chamber, and a valve body having a first flow path communicating with a communication port provided in the valve seat and a second flow path communicating with the valve chamber, and press-separated from the valve seat. And a valve body that opens and closes the valve, a bush having a through-hole formed with an internal thread on the inner peripheral surface, and is screwed into the internal thread of the bush, and the valve body is connected to the lower end. In the on-off valve with a flow path having a stem, the female thread portion of the bush is provided in the clockwise direction , an annular protrusion is provided on the upper portion of the valve body, and an inner peripheral surface of the annular protrusion is A female screw portion having a screw in the clockwise direction to which the bush is screwed, and a male screw portion having a screw in a direction opposite to the female screw portion are provided at different pitches on the outer peripheral surface of the annular protrusion, the stem to the male screw portion is to allow through without coming into contact Cap nut is screwed, the flow passage opening-closing valve lower surface of the inner brim portion provided at an upper portion of the cap nut, characterized that you in contact with an upper face of the bush. A valve seat is formed on the bottom surface of the valve chamber, and a valve body having a first flow path communicating with a communication port provided in the valve seat and a second flow path communicating with the valve chamber, and press-separated from the valve seat. A valve body that opens and closes the valve, a bush having a through-hole formed with an internal thread portion on the inner peripheral surface, a stem that is screwed into the internal thread portion of the bush and that is connected to the lower end portion of the valve body An annular protrusion is provided on the upper portion of the valve body, and an internal thread portion into which the bush is screwed to an inner peripheral surface of the annular protrusion is an outer periphery of the annular protrusion. The surface is provided with male screw portions provided at a pitch of 1/6 to 5/6 of the pitch of the female screw portion, and a cap nut with which the stem can pass through the male screw portion is provided. An on-off valve with a flow path, which is screwed. A diaphragm extends in the radial direction of the valve body, and an annular locking portion provided on the outer peripheral edge of the diaphragm is fitted in an annular recess provided on the inner periphery of the annular protrusion of the valve body. The on-off valve with flow passage according to claim 1 or 2, wherein the valve body is sandwiched and fixed between the valve body and the lower portion of the bush. An on-off valve with a passage having a main valve chamber, a sub valve chamber, and an inlet passage and an outlet passage communicating with the main valve chamber, and provided at a position substantially orthogonal to or substantially parallel to these passage axes. A valve seat is formed on the bottom surface of the auxiliary valve chamber, and a communication port provided in the valve seat communicates with the inlet flow channel, and the auxiliary valve chamber is the outlet flow channel or the main valve. A valve main body having a second flow path communicating with the chamber, a sub-valve body that opens and closes the valve by being pressed against and separated from the valve seat, and an internal thread portion having a screw in the clockwise direction on the inner peripheral surface is formed. A bush having a through hole, a stem threadedly engaged with the female thread portion of the bush, and a stem connected to the valve body at a lower end portion, and an annular protrusion provided on the upper portion of the valve body, the inner peripheral surface of the annular projection female screw portion having a right rotation direction of the screw which said bushing is screwed, the annular protrusion The peripheral surface is provided with a pitch external thread portion are different from each having a female screw portion and the opposite direction of the screw, among which the stem male screw portion is to allow through without contact, provided in the upper portion of the cap nut The on- off valve with flow passage according to any one of claims 1 to 3, wherein a lower surface of the flange portion is in contact with an upper surface of the bush .

Images