JP2014190476A - Check valve and method for manufacturing valve body for check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easy forming check valve of which weight is made light while its entire body is formed compact, realizing its stable opening or closing operation even under a case that a specific gravity of fluid is low and capable of preventing chattering and provide a method for manufacturing the valve body for the check valve.SOLUTION: This invention relates to a check valve in which a swing valve body 4 is moved toward or away from a valve seat surface 8 inside a body 3 to open/close a channel, the swing valve body 4 is arranged such that a disc-like valve body 20 having a sealable seat surface 22 at the valve seat surface 8 and an arm part 21 to cause the valve body 20 to be swung are separately arranged, a column-like protrusion 23 is formed at the central part at an opposite surface of the seat surface 22 of the valve body 20, an annular edge part is formed at an outer diameter side of the column-like protrusion part 23 and at the same time the column-like protrusion part 23 is inserted into a hole part 31 formed at the arm part 21, the annular edge part is caulked to expand its diameter and pushed out to cause the column-like protrusion part 23 to be engaged with and fixed to a peripheral edge part 32 of the hole part 31.

Description

  The present invention contributes to weight reduction and downsizing, and manufactures a swing type check valve and a check valve valve body that reliably exerts a check function and a valve opening function in any use form of horizontal piping and vertical piping Regarding the method.

  Conventionally, as this type of check valve, for example, Patent Document 1 and the check valve 100 of FIG. 8 are disclosed. In these check valves, in FIG. 8, the disc 101 is supported by the bearing portion 104 so as to be swingable by the pin 103 via the arm 102, and in the small check valve, the disc 101 and the arm 102 are Is often made from an integral casting. On the other hand, in the case of a relatively large check valve, a disc and an arm portion are separately formed of castings, and these disc and arm are fixed by bolts and nuts.

  Further, in the check valve 100, a seal surface 106 with which the disc 101 abuts and a pin hole 107 for the pin 103 are formed in an integral body portion 105, and the seal surface 106 is subjected to machining. A pin hole 107 is recessed behind the seal surface 106. Therefore, in the valve open state of FIG. 8A, a center of gravity (not shown) is present on the right side of the center of the disc 101, and the disc 101 is sealed in a suspended state by the force of the center of gravity moving to the left. The valve is closed in contact with the surface 106. In order to secure this valve closed state, the center portion of the disc 101 is formed in a bowl shape, and the center of gravity is shifted to the right side in the valve closed state by this bowl shaped portion 108.

Japanese Utility Model Publication No. 2-94979

In the case of the check valve of Patent Document 1 and FIG. 8, since the disc 101 and the arm 102 are integrally cast in FIG. 8, the whole becomes thick and the weight increases. Furthermore, when the disc and the arm are formed separately, each component becomes heavy, and in addition, the weight of the fixing bolt and nut increases, which causes a further increase in weight.
When a gas such as steam, air, or gas is used as a fluid for the swing check valve of the disc 101 having a large weight as described above, it becomes difficult to secure a large opening, and the chatter 101 repeatedly opens and closes. As a result, the sealing surface 106 and the pin 103 may be worn out or noise may be generated. As a result, when flowing a fluid having a small specific gravity, a light disc is required to stabilize the valve opening as much as possible from the start of the flow.
Furthermore, when the disc 101 and the arm 102 are formed by casting, there is a problem that post-processing is required by machining or the like.

  The present invention has been developed in order to solve the conventional problems. The object of the present invention is to reduce the weight by making the whole compact and to perform stable opening / closing operation even when the specific gravity of the fluid is small. An object of the present invention is to provide a check valve that can be easily formed and that can prevent chattering and a method of manufacturing a check valve valve body.

  In order to achieve the above object, the invention according to claim 1 is directed to a check valve in which a valve body for swing contacts and separates from a valve seat surface inside the body to open and close the flow path, and a seat surface that can be sealed to the valve seat surface is provided. A disc-shaped valve body part and an arm part for swinging the valve body part are provided separately, and a cylindrical convex part is formed at the center of the opposite side of the seat surface of the valve body part. An annular edge is formed on the outer diameter side, and the cylindrical convex portion is inserted into a hole formed in the arm portion, and the annular peripheral portion is expanded and pushed out by caulking to lock the cylindrical convex portion at the peripheral portion of the hole portion. This is a check valve which is fixed and provided with a valve body for swing.

  The invention according to claim 2 is a check valve in which an annular edge is extruded by forming an annular recess having a smaller diameter than the annular edge on the seat surface side of the valve body.

  The invention which concerns on Claim 3 is a non-return valve which provided the thick part in the center part by the side of the seat surface of a valve body part.

  In the invention according to claim 4, the material of the valve body part is press-molded to form the seat surface side and the mounting surface side having the cylindrical convex portion, and the formed seat surface side is made to face the pedestal of the caulking machine. With the valve body placed in this manner, the check valve is configured such that the cylindrical convex portion is caulked into the hole portion by the punch of this caulking machine so that the valve body portion and the arm portion are integrated to provide a swing valve body. This is a method for manufacturing a valve body.

  In the invention according to claim 5, the punch of the caulking machine is tilted with respect to the caulking direction, and the punch is swung and rotated while the front end of the punch is in contact with a part of the cylindrical convex portion. This is a method for manufacturing a valve body for a check valve in which the vicinity of the circumference is gradually crimped.

  According to the first aspect of the present invention, the disc-shaped valve body and the arm are formed into a separate thin plate by press molding, and these are integrated by caulking to form a compact and light weight. This contributes to a reduction in the outer diameter of the entire valve. In this case, when the caulking is concentrated on the annular edge, the caulking force can be reduced, and deformation of the valve body and stress corrosion cracking can be prevented. Since it is not necessary to form by casting, it can be easily formed without post-processing by cutting. Since it is not necessary to fix a valve body part and an arm part with a volt | bolt and a nut, the increase in a weight can be prevented and the increase in a number of parts can also be suppressed. When a fluid flows inside, even if the fluid is a gas having a small specific gravity such as steam, a stable opening / closing operation is exhibited while a sufficiently large valve opening degree is secured, and chattering can be prevented.

  According to the invention of claim 2, by providing the annular edge with an annular recess having a smaller diameter than the annular edge, the thickness of the valve body in the vicinity of the base of the cylindrical tube portion is secured, and deformation during caulking is achieved. Can be suppressed. Even in the case of a valve body for a small-diameter check valve, the thickness of the extruded portion is ensured to suppress the deformation of the seat, and a high sealing performance when the valve is closed can be secured.

  According to the invention which concerns on Claim 3, the deformation | transformation of a valve body can be prevented by making the center part by the side of the seat surface of the valve body which the stress by fluid pressure tends to concentrate into a thick shape.

  According to the invention which concerns on Claim 4, a valve body part and an arm part can be integrated by the press molding of a general caulking machine, and the valve body of a swing type non-return valve can be provided easily. At this time, the cylindrical convex part is crimped while receiving the jig on the seat surface side with the pedestal of the caulking machine, thereby suppressing the distortion of the seat surface and ensuring high sealing performance, and providing the valve body part and the arm part in a thin shape Even in such a case, it is possible to manufacture a check valve valve body that can be integrated with sufficient strength and can exhibit a stable opening and closing operation while preventing chattering.

  According to the invention of claim 5, since the caulking machine punch is used to gradually caulk in the vicinity of the outer periphery of the cylindrical convex portion, the residual stress can be suppressed to a low level by preventing distortion of the valve body. Also reduces the risk of corrosion cracking.

It is a longitudinal cross-sectional view which shows embodiment of the non-return valve in this invention. It is a longitudinal cross-sectional view which shows the state which the valve body of FIG. 1 opened fully. FIG. 2 is an exploded perspective view of the check valve of FIG. 1. It is a longitudinal cross-sectional view which shows the valve body part and arm part which were integrated. It is sectional drawing which shows a valve body part and a press. It is a partial cross section figure which shows the principal part of a crimping machine. It is the A section expanded sectional view of FIG. (A) is a center sectional view showing a conventional swing type check valve. (B) is BB sectional drawing of (a).

  Embodiments of a check valve and a check valve manufacturing method according to the present invention will be described below in detail with reference to the drawings. 1 shows a longitudinal sectional view of the check valve of the present invention, and FIG. 3 shows a separated state of the check valve of FIG.

  As shown in the figure, a check valve body (hereinafter referred to as a valve body) 1 has a cap-like cap 2, a body 3, and a swing valve body 4, and the cap 2 and the body 3 are formed on the cap 2. Since the male screw 5a and the body 3 are formed, the screw 5b is integrated with the screw 5b. The valve body 1 is provided with a swing valve body 4 in a cap 2 and a body 3 so as to be freely opened and closed via a shaft attachment portion 6, and the swing valve body 4 flows in contact with and away from a valve seat surface 8 inside the body 3. The road is opened and closed. The swing valve body 4 is attached to the cap 2 side. The check valve in the present embodiment is assumed to be used at a nominal pressure of 10K and a use temperature of −10 to 220 ° C., and the main fluid is steam or oil. The material of the body 3 and the cap 2 is, for example, ductile cast iron.

  The cap 2 shown in FIG. 3 is formed in a small diameter, for example, and the cap 2 is provided with a primary flow path 7, the swing valve body 4, and a valve seat surface 8. On the other hand, the body 3 is provided in a substantially cylindrical shape, and a secondary flow path 9 is provided inside the body 3, and the swing valve body 4 having the pivoting portion 6 as a fulcrum in the secondary side flow path 9 region. A pivot attachment region R is configured.

  In the valve body 1, with respect to the flow from the primary flow path 7, the swing valve body 4 opens the valve in the pivot attachment region R with the shaft attachment portion 6 as a fulcrum, and allows the fluid to pass therethrough. With respect to the flow from the passage 9, the swing valve element 4 is put in a fluid and the valve is closed to prevent backflow.

On the cap 2 side in FIG. 1, at least a part of the shaft attachment portion 6 is located in the diameter D of the primary side flow path 7, and is provided at a position where it has bite into the diameter D of the primary side flow path 7.
A swing valve body 4 is provided on the shaft attachment portion 6 via a protrusion 10, a hinge pin 11, and a rotating wheel 13.
The protruding portion 10 is formed in a substantially rib shape so that at least a part of the protruding portion protrudes into the diameter D of the primary channel 7 and bites into the diameter D. The protruding portion 10 has a through-hole for attaching the hinge pin 11. 10a is provided. Further, a stopper 35 capable of locking a locking base end 15 described later is provided on the protruding portion 10 on the side opposite to the locking base end 15.

In FIG. 4, the swing valve body 4 includes a valve body portion 20 and a swing arm portion 21 that is separate from the valve body portion 20.
The valve body portion 20 is formed by press-molding into a disc shape, and the valve body portion 20 is formed with a seat surface 22 and a cylindrical convex portion 23, respectively. The seat surface 22 is provided on the valve seat surface 8 side, and is provided so as to be able to seal between the flow paths 7 and 9 by contacting the valve seat surface 8 when the valve is closed. The cylindrical convex portion 23 is formed at the center of the opposite surface of the sheet surface 22, and an annular edge 25 is formed on the upper outer diameter side of the cylindrical convex portion 23.

Further, a flat annular portion 55 having a medium diameter is provided on the seat surface 22 side of the valve body portion 20 by press forming, and thereby the cylindrical convex portion 23 on the opposite surface is formed by extrusion. A small-diameter annular recess 26 is provided on the inner diameter side of the flat annular portion 55 by press forming. By forming the annular recess 26 to have a smaller diameter than the annular edge 25, the valve body is deformed when the annular recess 26 is press-molded by securing the thickness of the valve body near the base of the cylindrical tube portion. Is suppressed. The cross-sectional shape of the annular recess 26 has a tapered surface 26a inclined toward the annular edge 25, thereby facilitating the molding of the annular edge 25.
By providing this annular recess 26, a thick portion 27 is provided on the seat surface 22 side of the valve body portion 20. With the thick portion 27, the central portion of the valve body portion 20 is formed thicker than the thickness near the outer periphery that forms the seat surface 22.

  Thus, by providing the thick part 27 in the valve body part 20, the deformation | transformation at the time of crimping of the valve body 4 can be suppressed, and also when the valve body part 20 in a valve closed state receives non-return pressure It is possible to reduce the stress and deformation, and to suppress the generated stress applied to the valve seat surface 8.

  On the other hand, in FIG. 4, the arm portion 21 has a substantially annular attachment portion 30 having a slightly smaller diameter than the diameter of the valve body portion 20, and the valve body portion 20 is attached to the attachment portion 30. A hole 31 having substantially the same diameter as the cylindrical convex portion 23 of the valve body portion 20 is formed at the central portion of the attachment portion 30. The cylindrical convex portion 23 is inserted into the hole portion 31 and the annular edge portion 25 is pushed out by caulking so that the cylindrical convex portion 23 is locked and fixed to the peripheral edge portion 32 of the hole portion 31. A swing valve body 4 in which the arm 20 and the arm portion 21 are integrated is formed.

  A locking step portion 37 having a tapered cross section is provided in the hole portion 31 of the attachment portion 30 of the arm portion 21 on the annular edge portion 25 side of the mounted valve body portion 20. The valve body 20 is attached to the attachment portion 30 by the annular edge portion 25 having been expanded and pushed by caulking to the engagement step portion 37. The locking step portion 25 may have other cross-sectional shapes, but by using a tapered cross section, a wedge action can be used when locking and fixing the valve body portion 20, so The valve body 20 can be firmly fixed even with a proper amount of extrusion. Further, by setting the locking step portion 37 to have a tapered cross section, the valve body portion 20 can be aligned and fixed to the arm portion 21 by the annular edge portion 25 whose diameter has been pushed out, and the valve body shaft The arm portion 21 can be in close contact with the valve body portion 20 with respect to the core direction.

  A step portion 38 is provided on the non-annular edge 25 side of the hole portion 31 of the attachment portion 30. This step portion 38 avoids interference with the R portion 39 formed at the base of the cylindrical convex portion 23 during the press molding of the valve body portion 20, and the edge of the hole portion 31 is strongly pressed by the R portion 39 during caulking. The mounting part 30 and the valve body part 20 can be further brought into close contact with each other while preventing stress concentration due to the above, and the above-described caulking can prevent the stress concentration on the valve body 4 and can be locked and fixed without deviation. It has become. The cross-sectional shape of the stepped portion 38 may be a tapered shape in addition to the rectangular shape shown in the embodiment.

  On the outer periphery of the attachment portion 30, substantially L-shaped arm bodies 33 are formed to project at two locations. A rotating wheel 13 is provided at the end of each arm body 33. The rotating wheel 13 is formed in an elliptical shape having a long diameter as shown in FIG. 4 so that the hinge pin 11 can be inserted therethrough. As shown in FIG. 3, the arm portion 21 and the rotating wheel 13 are provided with reinforcing rib portions 34 along the forming direction thereof. A rib-like locking base end portion 15 is provided between the rotating wheels 13 and 13 so as to span between them, and this locking base end portion 15 rotates the valve body 4 for swing (valve The valve body 4 can be locked to the stopper portion 35 provided in the cap 2 when the valve body 4 is opened, and the valve body 4 is self-weighted even when the swing valve body 4 is opened in the vertical piping and the fluid in the flow path is reduced. It is formed at a position that is held at the position of the center of gravity G that is closed.

  In the present embodiment, the center of gravity G of the swing valve body 4 is set so as to be positioned on the valve seat surface 8 side lower than the height of the hinge pin 11 shown by the broken line in FIG. Further, in FIG. 3, the rotating wheel 13 is provided so as to be inserted into both side positions of the hinge pin 11, but may be provided so as to be able to be inserted into the center position of the hinge pin 11. 15 are provided at both side positions of the rotating wheel 13.

  In FIG. 1, the shaft mounting portion 6 is configured so that the rotating wheel 13 of the arm portion 21 is rotatably attached to both sides of the hinge pin 11 while the hinge pin 11 is inserted into the through hole 10 a of the protruding portion 10. As a result, the swing valve body 4 is pivoted about the shaft attachment portion 6 so that the valve can be closed or opened. When the swing valve body 4 rotates in the valve opening direction, the locking base end portion 15 of the arm portion 21 is locked to the stopper portion 35, so that the swing valve body 4 in the fully opened state as described above. Can be securely locked.

With this structure, when the valve of FIG. 2 is opened, the relationship between the stopper portion 35 of the cap 2 and the locking base end portion 15 of the arm portion 21 is not affected by the shape and size of the body 3. It is possible to set the opening limit with high accuracy, and the valve body 4 is reliably returned from the fully opened state in FIG. 2 to the closed state in FIG. 1 in both horizontal piping and vertical piping. Performance is ensured.
At this time, since the rotating wheel 13 has an elliptical shape with a long diameter, the valve body 4 can move in the major axis direction of the elliptical shape, so that a reliable valve closing state can be obtained and the radial direction of the flow path can be obtained. The displacement to the valve is reduced and the operation when opening and closing the valve is smooth.

In addition, the shaft attachment portion 6 is disposed in the bore D of the primary side flow path 7, and the shaft attachment portion 6 is in a state of biting into the bore D. In this case, since the caliber axis S is eccentric from the flow path axis L, the outer shape of the check valve can be reduced.
By providing the shaft attaching portion 6 on the cap 2 side, the swing valve body 4 can be attached to the cap 2 in advance, and the valve body 1 can be assembled while reducing the risk of damaging the valve seat surface 8.

  As shown in FIG. 1, the valve seat surface 8 is provided on the protruding side of the inner end portion of the cap 2 in a state where the bore axis S is eccentric with respect to the flow path axis L of the cap 2, and the valve seat surface 8 In addition, the swing valve body 4 can come into contact therewith. In this case, the valve seat surface 8 is provided in a portion that is proximate to the secondary side of the screwing portion 5 between the cap 2 and the body 3 and that protrudes toward the secondary side of the shaft attaching portion 6. . The valve seat surface 8 is formed in a direction perpendicular to the primary flow path 7.

  Since the valve seat surface 8 is formed at such a position, the swing valve body 4 suspended by the hinge pin 11 during horizontal piping has a force in a direction in which the swing valve body 4 is in close contact with the valve seat by the center of gravity G. Join. As a result, not only when the horizontal piping is inclined, but also when the piping is slightly inclined, the valve body 4 is reliably seated on the valve seat surface 8 when the valve of FIG. 1 is closed. Therefore, it is not necessary to incline and form the valve seat surface 8 in order to bring the swing valve body 4 into close contact, and the processing accuracy of the valve seat surface 8 is easily obtained.

  In addition, a mounting structure by co-firing, that is, a structure in which the valve body is inserted from the opening in the upper part of the body, the body and the swing valve body are drilled together from the outside of the body, and these are axially attached by hinge pins. This makes it easy to manufacture. In this case, the sealing performance is exhibited by the elliptical rotating wheel 13 instead of the double dawn, and the position accuracy of the through hole 10a is ensured by making the valve seat surface 8 a vertical surface (0 °) with respect to the caliber axis S. Compared with the case of 3 to 5 ° which is the angle of the valve seat surface of a general check valve, the 0 ° valve seat surface 8 becomes the processing reference surface, and it becomes easy to obtain the processing accuracy. .

  Thus, even when the valve seat surface 8 is set to 0 °, the hinge pin 11 is provided on the cap 2 side as described above, and the force is applied to the valve body portion 20 in the direction of contact with the seat surface 22. However, if the valve opening is increased by paying attention to the position of the center of gravity G of the valve body 20, the sealing performance is less affected by unintended piping inclination. Since the arm portion 21 only acts when the valve body portion 20 is opened by the fluid, the arm portion 21 may be provided thinner and lighter than the valve body portion 20. Therefore, if the arm portion 21 is reduced in weight, the center of gravity G of the valve body portion 20 is reliably left in the closing direction during vertical piping.

  Since the valve body portion 20 and the arm portion 21 are provided separately and are configured to be caulked, they can be provided with different thicknesses. For example, the thickness of the arm portion 21 is greater than that of the valve body portion 20. By reducing the thickness, it is possible to contribute to the compactness of the valve body 1 in the outer diameter direction.

  When the fluid is a gas such as steam, it may be difficult to open the valve body 4 widely and there is a concern that chattering may occur, but sufficient strength of the valve body portion 20 and the arm portion 21 is ensured. By reducing the weight of each, the valve closing operation is stabilized by opening the valve body 4 to a state where a sufficient flow rate can be ensured when the valve is opened. Therefore, chattering of the valve body 4 can be reliably prevented.

  The valve body 1 of the check valve has a cap 2 screwed into a body 3, a through hole 10a for attaching the valve body 4 is provided in the cap 3, and a seat surface 22 of the valve body 4 is provided on the cap 2 side. Since it is eccentric with respect to the pipe screw 36 and the hinge pin 11 is close to the flow path side, the outer diameter of the valve is made compact. As shown in FIG. 1, the arm body 33 protrudes from the sheet surface 22, and a part of the arm body 33 covers the outer diameter of the sheet surface 22, but it is difficult to process the sheet surface 22. The valve body 4 can be easily manufactured by processing the seat surface 22 on the valve body portion 20 separate from the arm portion 21 and then providing them together by caulking.

  As an example of the dimensions of the valve body 4 of the check valve in the above-described embodiment, when the check valve has a nominal diameter of 1 inch, for example, it is as follows. As the valve body 4 side, the outer diameter φ32 mm, the outer diameter φ25 mm of the mounting portion 30 of the arm portion 21, the outer diameter φ16 mm of the cylindrical convex portion 23 of the valve body 4, and the width (radial direction) of the annular edge 25 from 0.5 to 0.5. The thickness of the annular edge 25 (axial direction) is 0.1 to 0.3 mm, and the thickness of the valve body 4 near the seat surface 22 is 2.5 mm. On the other hand, the valve seat surface 8 side of the cap 2 has an inner diameter of 25 mm and a valve seat width (radial direction) of 2 mm.

Next, a method for manufacturing the above-described check valve valve body will be described.
When manufacturing the valve body 4 of the check valve described above, the material that becomes the valve body portion 20 is press-molded by the upper mold 41 and the lower mold 42 of the press machine 40 shown in FIG. And the attachment surface side which has the cylindrical convex part 23 is processed. Thus, by pressing the valve body part 20 and the arm part 21, the cost can be reduced as compared with the case where an integral valve body is provided by casting. The material of the valve body portion 20 and the arm portion 21 is made of, for example, austenitic stainless steel such as SUS304, and stress corrosion cracking due to the residual stress of press forming can be avoided by applying a solution heat treatment after press forming to remove stress. . Furthermore, accuracy can be improved by surface-treating the seat surface 22 of the valve body 20 after the heat treatment.

Subsequently, in FIGS. 6 and 7, the valve body 20 and the arm part 21 after press molding are integrated by a caulking process to provide the swing valve body 4. In this case, it can be integrated with a relatively low load by caulking with the caulking machine 50 shown in the figure, and distortion of the processed sheet surface 22 can be suppressed.
At the time of caulking, the valve body 20 is placed so that the sheet surface 22 side after press molding faces the pedestal 51 of the caulking machine 50, and in this state, the cylindrical convex part 23 is formed into the hole 31 by the punch 52 of the caulking machine 50. To be caulked. Thus, the valve body 20 and the arm portion 21 can be integrated to provide the swing valve body 4.
FIG. 7 shows a state in which the annular edge pushed out by caulking is locked to the locking step 37 of the arm 21.

  At this time, the punch 52 of the caulking machine 50 (not shown) is tilted with respect to the caulking direction about the valve element side tip P. As a result, the tip 53 can be brought into contact with a part of the cylindrical convex 23, and the annular edge 25 can be rotated and rotated like a scrape so that the annular edge 25 is moved to the outer edge of the cylindrical convex 23. Try to caulk gradually around the circumference.

  The caulking diameter of the annular edge portion 25 during the caulking process is desirably as large as possible in order to secure the fixing strength between the arm portion 21 and the valve body portion 20, and it is also necessary to keep the load necessary for caulking low. . In the manufacturing method of the present invention, as described above, by forming the annular edge 25 on the outer diameter side of the cylindrical convex portion 23, the crimped portion becomes a ring-shaped projection, which is pushed out rather than being crushed. The processing load can be lowered while reducing the processing area as much as possible. Thereby, the risk of stress corrosion cracking of the valve body part 20 and the arm part 21 is reduced.

Further, at the time of press molding before caulking, a planar annular portion 55 is formed on the diameter-enlarged side of the annular recess 26 on the opposite surface of the annular edge 25, and this planar annular portion 55 is placed on the mounting surface side on the base 51 It can be used as a jig holder. For this reason, as shown in FIGS. 6 and 7, the sealing performance of the seat surface 22 can be ensured without the base 51 coming into contact with the seat surface 22 and damaging the seat surface 22 when caulking.
In addition, as described above, the annular recess 26 is press-molded to have a smaller diameter than the annular edge 25, so that the thickness of the valve body portion 20 can be ensured and the strength can be improved. Thus, deformation of the seat surface 22 due to the caulking process can be suppressed, and the valve body 4 can be mass-produced with the thin valve body portion 20 and the arm portion 21 to reduce the manufacturing cost.

As described above, in the manufacturing method of the check valve valve body, when the swing valve body 4 is provided, the caulking portion is limited to the annular step portion 25, and when the annular step portion 25 is caulked, so-called crushing is performed. It is not formed, but is formed by intermittently extruding the diameter by the swing rotation of the punch 52. At this time, the hole portion 31 of the attachment portion 30 that is locked by the push-out portion is tapered in cross section, and can be locked and fixed utilizing the wedge action.
With these devices, a press valve body that enables caulking with a small force, reduces stress applied to the valve body by caulking, prevents deformation and cracking of the valve body, and enables reliable valve seat sealing is provided. A check valve can be obtained.

DESCRIPTION OF SYMBOLS 1 Valve body 3 Body 4 Swing valve body 8 Valve seat surface 20 Valve body part 21 Arm part 22 Seat surface 23 Cylindrical convex part 25 Annular edge part 26 Annular recessed part 27 Thick part 31 Hole part 32 Peripheral part 40 Press machine 50 Caulking Machine 51 Pedestal 52 Punch

Claims (5)

  In the check valve in which the valve body for swing contacts and separates from the valve seat surface inside the body to open and close the flow path, the disc-shaped valve body portion having a seat surface that can be sealed to the valve seat surface, and the valve body portion The arm part to be swung is provided separately, and a cylindrical convex part is formed at the center of the valve body part opposite to the seat surface, and an annular edge is formed on the outer diameter side of the cylindrical convex part, The cylindrical convex portion is inserted into a hole formed in the arm portion, the annular edge portion is pushed out by diameter expansion by caulking, and the cylindrical convex portion is locked and fixed to the peripheral portion of the hole portion, thereby the swing valve A check valve characterized by providing a body.   2. The check valve according to claim 1, wherein the annular edge is extruded by forming an annular recess having a smaller diameter than the annular edge on the seat surface side of the valve body.   The check valve according to claim 2, wherein a thick portion is provided at a central portion on the seat surface side of the valve body portion.   The check valve according to any one of claims 1 to 3, wherein the valve body material is press-molded to form a seat surface side and an attachment surface side having the cylindrical convex portion, and after molding In the state where the valve body portion is placed so that the seat surface side faces the pedestal of the caulking machine, the cylindrical convex portion is caulked into the hole with the punch of the caulking machine, and the valve body portion and the arm portion The valve body for a non-return valve, wherein the swing valve body is provided in an integrated manner.   The punch of the caulking machine is tilted with respect to the caulking direction, and the punch is swung and rotated while the front end of the punch is in contact with a part of the cylindrical convex portion, and the vicinity of the outer periphery of the cylindrical convex portion is gradually caulked. The manufacturing method of the valve body for non-return valves of Claim 4 made to do.

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