JP2011256940A - Check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manually rotate a valve element of a check valve formed by closing, with a lid member, an opening of a valve casing provided with a through-hole for inserting a valve shaft therein.SOLUTION: Lid members 9a, 9b for closing openings 2a on right and left sides of a valve casing 2 are rotatably mounted to circular recessed parts 5a on outer end faces of shaft reception boxes 5 for rotatably supporting a valve shaft 3; on the insides of the lid members 9a, 9b, engagement parts without engaging with the valve shaft 3 at a predetermined reference mounting position and engaging therewith to rotate the valve shaft 3 in a rotating direction for a pair of two valve elements 6a, 6b to open a passage 1 only when rotated from the reference mounting position are formed; and thereby the valve elements 6a, 6b can be manually rotated by rotating the lid members 9a, 9b.

Description

  The present invention relates to a check valve in which a valve body is rotated by a fluid pressure in a flow path to rotate a valve body that opens the flow path.

  In the check valve, when the fluid pressure on one side of the flow path becomes high, the valve body rotates to open the flow path, and when the fluid pressure on both sides of the flow path is the same or the fluid pressure on the other side is high, There is a check valve in which the valve body naturally closes the flow path. This type of check valve includes a swing type that rotates one valve element around a valve shaft supported by the valve box (see, for example, Patent Document 1), and is passed to the flow path of the valve box. There is a dual plate type (see, for example, Patent Document 2) in which two valve bodies that close the flow path by half are rotated around the supported valve shaft. The check valve described in Patent Document 1 is provided in a lateral flow path, and the valve body is rotated by fluid pressure and is urged in a closing direction by its own weight. The check valve described in Patent Document 2 is provided in a vertical flow path, and the valve body is rotated upward by fluid pressure from below and is biased downward by its own weight. Yes. Some check valves provided in the lateral flow path are urged in a direction in which the valve body is closed by a spring.

  In addition, the check valves described in Patent Documents 1 and 2 are provided with through holes through which the valve shafts are inserted on both sides of the valve box, and the openings of the through holes through which these valve shafts are inserted are covered with a lid member. . The device described in Patent Document 1 rotatably supports a valve shaft inserted through the through holes on both sides, and a single valve element is fixed to the rotatable valve shaft with a key. In addition, the device described in Patent Document 2 supports a valve shaft inserted through the through holes on both sides in a freely rotatable manner, and the rotatable valve shaft and a sleeve that is rotatably fitted on the outside of the valve shaft. The valve body of the sheet is stopped and attached.

  As described in Patent Document 1, a check valve in which a valve body is fixed to a rotatable valve shaft adopts a shaft seal structure that seals a valve shaft rotatably supported by a valve box with a gland packing or the like. The frictional resistance against the rotation of the valve shaft increases, and the valve body does not rotate smoothly due to the fluid pressure. In what is described in Patent Document 1, the opening of the valve box is hermetically closed without adopting a shaft seal structure by sealing the gap between the lid member covering the opening of the through hole and the valve box. Yes. In addition, the check valve described in Patent Document 2 in which the valve shaft does not rotate also seals the opening of the valve box in an airtight manner by sealing between the lid member and the valve box.

Japanese Utility Model Publication No. 63-119976 JP 2005-61458 A

  As described in Patent Documents 1 and 2, a check valve in which an opening of a valve box provided with a through hole through which a valve shaft is inserted is closed with a lid member is forcibly restricted for testing or inspection. There is a problem that the valve body cannot be manually rotated when it is desired to open it. In order to manually rotate the valve body, it is conceivable to expose the rotatable valve shaft to the outside of the lid member. In this case, a shaft seal is provided between the lid member and the valve shaft. Therefore, smooth rotation of the valve body due to fluid pressure is hindered.

  Therefore, an object of the present invention is to enable manual rotation of a valve body of a check valve in which an opening portion of a valve box provided with a through hole through which a valve shaft is inserted is closed with a lid member.

  In order to solve the above problems, the present invention provides a through hole through which a valve shaft is inserted into a valve box on both sides, and closes the openings on both sides provided with these through holes with a lid member. A valve shaft inserted into the hole is rotatably supported, and a valve body fixed to the valve shaft is urged in a direction to close the flow path of the valve box, and the flow path is blocked by the fluid pressure of the flow path. In the check valve that is rotated so as to open in one direction, at least one of the lid members that close the openings on both sides of the valve box is rotatably mounted around the valve shaft that is inserted through the through hole. The valve shaft is not engaged with the valve shaft at a predetermined reference mounting position inside the lid member, and the valve shaft is rotated in a rotation direction in which the valve body opens the flow path only when the valve body is rotated from the reference mounting position. The structure which provided the engaging part engaged so that it might rotate was employ | adopted.

  That is, at least one of the lid members that close the openings on both sides of the valve box is rotatably attached around the valve shaft that is inserted through the through-hole, and the valve is disposed inside the lid member at a predetermined reference attachment position. By providing an engagement portion that engages so that the valve body rotates in the rotation direction in which the valve body opens the flow path only when the valve body is rotated from the reference mounting position without being engaged with the shaft, the lid member is The valve body can be rotated manually by rotating.

  By providing means for fixing the rotation position of the lid member in a state where the engagement portion of the lid member is engaged with the valve shaft and the valve body is rotated so as to open the flow path, The state where the body is rotated so as to open the flow path can be maintained.

  When the check valve is configured to rotate two valve bodies that close the flow path by half around the valve shaft that is passed to the flow path of the valve box, the valve shaft can be rotated freely. A sleeve member is rotatably fitted to a supported inner shaft member, one of the two valve bodies is fixed to the shaft member, and the other valve body is fixed to the sleeve. The shaft member moves in the rotation direction in which the one valve body opens the flow path only when it is rotated from the reference mounting position inside the one lid member that is fixed to the member and closes the opening. An engaging portion that engages so as to rotate is provided, and only when the other valve body is rotated from the reference attachment position on the inner side of the other lid member, the other valve body rotates in the direction of rotation that opens the flow path. An engagement portion that engages the sleeve member so as to rotate may be provided.

  In each of the check valves described above, the flow path of the valve box is vertically oriented, the valve body is urged downward to close the flow path by its own weight, and the flow path is opened by fluid pressure from below the flow path. Thus, it can be turned upward.

  The check valve according to the present invention attaches at least one of the lid members closing the openings on both sides of the valve box so as to be rotatable around the valve shaft inserted through the through hole, and inside the lid member, An engagement portion that engages so as to rotate the valve shaft in a rotational direction in which the valve body opens the flow path only when the valve body is rotated from the reference mounting position without being engaged with the valve shaft at a predetermined reference mounting position. Since it is provided, the valve body can be manually rotated, and the flow path can be forcibly opened for testing or inspection.

Longitudinal front view showing the check valve of the first embodiment 1 is a longitudinal side view of FIG. Plan view of FIG. Side view showing the bearing box of FIG. (A) is sectional drawing along the VV line of FIG. 1, (b) is sectional drawing which shows the state which rotated the cover member of (a). The disassembled perspective view which shows the edge part of the cover member and shaft member of FIG. Sectional view along line VII-VII in FIG. The disassembled perspective view which shows the edge part of the cover member and sleeve member of FIG. Longitudinal front view showing a check valve according to the second embodiment Side view showing the bearing box of FIG. (A), (b) is sectional drawing along the XI-XI line of FIG. 9, (c), (d) is sectional drawing which shows the state which rotates the cover member of (a). The disassembled perspective view which shows the edge part of the cover member and shaft member of FIG. (A), (b) is sectional drawing along the XIII-XIII line of FIG. 9, (c), (d) is sectional drawing which shows the state which rotates the cover member of (a). The disassembled perspective view which shows the edge part of the cover member and sleeve member of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 8 show a first embodiment. As shown in FIGS. 1 to 3, the check valve has valve shafts 3 that are passed to the center of the flow path 1 on the left and right sides of a cylindrical valve box 2 provided with a vertical flow path 1. An outward boss portion 2b provided with a through-hole 2a to be inserted is provided, and a bearing box 5 for rotatably supporting the valve shaft 3 by a bearing 4 is attached to the outside thereof. The valve shaft 3 includes an inner shaft member 3a and a sleeve member 3b that is rotatably fitted to the shaft member 3a on both the left and right sides. The flow path 1 is closed in half by the shaft member 3a and the sleeve member 3b. Two pairs of semicircular valve bodies 6a and 6b are fixed.

  The valve bodies 6a and 6b are provided on the inner periphery of the valve box 2 by rotating upward by fluid pressure from below the flow path 1 to open the flow path 1 and rotating downward by its own weight. The flow path 1 is closed by contacting the valve seat 7. A stopper 8 that restricts the upward rotation position of each valve body 6a, 6b is also attached to the inside of the valve box 2.

  Lid members 9 a and 9 b are attached to the outer end faces of the left and right bearing boxes 5 with bolts 10. Each of the lid members 9a and 9b has a bottomed cylindrical shape in which the outer end surface of the cylindrical portion fitted in the circular recess 5a provided on the outer end surface of the bearing box 5 is closed. It can be rotated around the supported valve shaft 3. Further, between the boss portions 2b on both sides and the inner end surface of the bearing housing 5, and between the outer end surface of the bearing housing 5 and the front end surface of the cylindrical portion of each lid member 9a, 9b, the sealing members 11a, 11b, respectively. And the opening of the boss 2b of the valve box 2 provided with the through hole 2a is hermetically closed.

  As shown in FIG. 4, a bolt 10 for fixing the lid members 9a and 9b at the reference mounting position and the rotating position in a steady state is screwed into the recess 5a on the outer end surface of the bearing housing 5 as will be described later. Screw holes 12 are provided at four locations with a phase interval of 90 ° in the circumferential direction.

  As shown in FIGS. 5 and 6, an inward projection 13a as an engaging portion with the shaft member 3a is provided at one place in the circumferential direction on the inner peripheral surface of the cylindrical portion of the left lid member 9a. On the outer peripheral surface of the end portion inserted into the cylindrical portion of the lid member 9a of the shaft member 3a to which one valve body 6a is fixed, an outward protrusion 14a that engages with the protrusion 13a in the circumferential direction is one in the circumferential direction. It is provided in places. The lid member 9a is provided with bolt holes 15 through which the bolts 10 are inserted at four locations at a phase interval of 90 ° in the circumferential direction, and a tool such as a wrench that rotates the lid member 9a is provided on the outer circumferential surface thereof. A chamfer 16 is provided.

  FIG. 5A shows a state in which the lid member 9a is fixed at a reference mounting position in a steady state. In this state, the lid member 9a is fixed by the bolt 10 that is screwed into the screw hole 12 of the bearing box 5 so that the inward projection 13a of the lid member 9a is on the lower side, and the valve body 6a is rotated. Accordingly, even if the shaft member 3a rotates within the range indicated by the double-headed arrow in the drawing, the outward projection 14a of the shaft member 3a does not engage with the projection 13a of the lid member 9a, and the valve body 6a is lowered. It is freely rotated upward by the fluid pressure from.

  FIG. 5B shows a state in which the lid member 9a is rotated 180 ° in the direction of the arrow in the figure and fixed at the rotation position. At this time, the protrusion 14a of the shaft member 3a is engaged with the front surface side of the protrusion 13a of the rotating lid member 9a, and the valve body 6a is rotated upward along with the rotation of the shaft member 3a. When it comes to the upper side, the valve body 6a rotates to the fully open position. In this state, the lid member 9a turned upside down is fixed with the bolt 10 screwed into the screw hole 12, whereby the valve body 6a is held in the fully open position.

  As shown in FIGS. 7 and 8, an inward projection 13b as an engaging portion with the sleeve member 3b is provided at one circumferential position on the inner peripheral surface of the cylindrical portion of the right lid member 9b. The end face of the sleeve member 3b to which the other valve body 6b is fixed is provided with a protrusion 14b that protrudes axially into the cylindrical portion of the lid member 9b at one place in the circumferential direction and engages with the protrusion 13b in the circumferential direction. It has been. Similarly to the left lid member 9a, the lid member 9b is also provided with four bolt holes 15 and chamfers 16.

  FIG. 7A shows a state in which the lid member 9b is fixed at the reference attachment position. Similar to the left side, the lid member 9b is fixed so that the inward projection 13b is on the lower side, and the sleeve member 3b rotates within a range indicated by a double-pointed arrow in the drawing as the valve body 6b rotates. However, the protrusion 14b of the sleeve member 3b does not engage with the protrusion 13b of the lid member 9b, and the valve body 6b freely rotates upward.

  FIG. 7B shows a state in which the lid member 9b is rotated 180 ° in the direction of the arrow in the figure and fixed at the rotation position. The protrusion 14b of the sleeve member 3b engages with the front side of the protrusion 13b of the rotating lid member 9b, and the valve body 6b rotates upward as the sleeve member 3b rotates, so that the protrusion 13b comes upward. The valve body 6b rotates to the fully open position. In this state, by fixing the lid member 9a with the bolt 10 screwed into the screw hole 12, the valve body 6a is held in the fully open position.

  9 to 14 show a second embodiment. As shown in FIG. 9, the basic structure of this check valve is the same as that of the first embodiment. As will be described below, the outer end face of the bearing box 5 on both the left and right sides of the valve box 2. The bottomed cylindrical lid members 9a and 9b, which are rotatably fitted in the recesses 5a, are engaged with the shaft member 3a and the sleeve member 3b constituting the valve shaft 3, respectively. The other parts are the same as those of the first embodiment, and a pair of semicircular valve bodies 6a and 6b fixed to the shaft member 3a and the sleeve member 3b are provided from below the flow path 1, respectively. It is designed to rotate upward by fluid pressure.

  As shown in FIG. 10, in this embodiment, a reference screw hole 12a into which a bolt 10 for fixing each lid member 9a, 9b to a reference attachment position in a steady state is screwed into a recess 5a on the outer end surface of the bearing housing 5. And rotation screw holes 12b into which the bolts 10 to be fixed at the rotation position are screwed are provided at four positions, each having a phase interval of 90 ° in the circumferential direction and shifted in the circumferential direction. .

  As shown in FIG. 11 and FIG. 12, the left lid member 9a is formed on the inner peripheral surface of the bottomed cylindrical cylindrical portion as an engaging portion with the shaft member 3a, and is partially inward in the circumferential direction. A flat chordal surface 17a that bulges out is provided. The end surface of the shaft member 3a is provided with a partial protrusion 19a that protrudes in the axial direction into the cylindrical portion of the lid member 9a at a part of the circular cross section, and engages with the chord surface 17a on the partial protrusion 19a. Thus, a flat chord surface 18a that is recessed from the outer peripheral surface is formed. Further, similarly to the first embodiment, the lid member 9 a is provided with four bolt holes 15 and chamfers 16.

  11A and 11B show a state in which each bolt 10 is screwed into the reference screw hole 12a of the bearing housing 5 and the lid member 9a is fixed at the reference mounting position. (A) is when the valve body 6a is closed, and (b) is when the valve body 6a is fully opened. In this state, the chord surface 17a of the lid member 9a is directed to the opposite side of the chord surface 18a of the shaft member 3a, and the valve body 6a is rotated between the closed position (a) and the fully opened position (b). Even if the shaft member 3a rotates, the chord surfaces 17a and 18a do not engage with each other, and the valve body 6a freely rotates upward by the fluid pressure from below.

  11 (c) and 11 (d) show a state in which the lid member 9a is once pulled out and rotated, and is fitted so that the chord surface 17a of the lid member 9a and the chord surface 18a of the shaft member 3a face each other and engage with each other. Show. (C) is a case where the valve body 6a is closed, and (d) is a case where the valve body 6a is fully opened. In this state, the shaft member 3a is rotated by rotating the lid member 9a by the engagement of the chord surfaces 17a and 18a, and the valve body 6a is rotated from the closed position of (c) to the fully opened position of (d). Can be moved. In the state of (d), by screwing each bolt 10 into the screw hole 12b for rotation of the bearing housing 5, the valve body 6a is held in the fully open position.

  As shown in FIG. 13 and FIG. 14, the right lid member 9 b is inwardly in part in the circumferential direction on the inner circumferential surface of the bottomed cylindrical cylindrical portion, like the left lid member 9 a. A bulging flat chord surface 17b is provided. The end surface of the sleeve member 3b is provided with a partial protruding portion 19b that protrudes in the axial direction into the cylindrical portion of the lid member 9b at a part of the cylindrical cross section. The partial protruding portion 19b engages with the chord surface 17b. Thus, a flat chord surface 18b that is recessed from the outer peripheral surface is formed. The lid member 9b is also provided with four bolt holes 15 and chamfers 16.

  FIGS. 13A and 13B show a state in which each bolt 10 is screwed into the reference screw hole 12a of the bearing housing 5 and the lid member 9b is fixed at the reference mounting position, as in the left side. (A) is when the valve body 6b is closed, and (b) is when the valve body 6b is fully opened. In this state, the chord surface 17b of the lid member 9b is directed to the opposite side of the chord surface 18b of the sleeve member 3b, and the valve body 6b is rotated between the closed position (a) and the fully opened position (b). Even if the sleeve member 3b rotates, the chord surfaces 17b and 18b do not engage with each other, and the valve body 6b freely rotates upward.

  FIGS. 13C and 13D show a state in which the lid member 9b is once extracted and rotated, and is fitted so that the chord surface 17b of the lid member 9b and the chord surface 18b of the sleeve member 3b are engaged. (C) is when the valve body 6b is closed, and (d) is when the valve body 6b is fully opened. In this state, the sleeve member 3b is rotated by rotating the lid member 9b by the engagement of the chord surfaces 17b and 18b, and the valve body 6b is rotated from the closed position of (c) to the fully opened position of (d). Can be moved. In the state of (d), by screwing each bolt 10 into the screw hole 12b for rotation of the bearing housing 5, the valve body 6b is held in the fully open position.

  In each of the above-described embodiments, the lid member is engaged with the shaft member and the sleeve member as the valve shaft by the protrusion or the chord surface. However, the engagement member between the lid member and the valve shaft has a predetermined lid member. What is necessary is just to engage with the valve shaft only when it is not engaged with the valve shaft at the reference mounting position but rotated from the reference mounting position, and is not limited to those of the respective embodiments.

  Further, in each of the above-described embodiments, the flow path of the valve box is vertically oriented, the pair of two valve bodies are rotated to open and close the flow path, and are biased in the direction of closing the flow path by its own weight. However, the check valve according to the present invention can be configured such that the flow path of the valve box is oriented sideways and the valve body is biased in the direction of closing the flow path by a spring or the like, and one valve body is rotated. It is also possible to open and close the flow path.

DESCRIPTION OF SYMBOLS 1 Flow path 2 Valve box 2a Through-hole 2b Boss part 3 Valve shaft 3a Shaft member 3b Sleeve member 4 Bearing 5 Bearing box 5a Recess 6a, 6b Valve body 7 Valve seat 8 Stopper 9a, 9b Lid member 10 Bolt 11a, 11b Seal member 12, 12a, 12b Screw holes 13a, 13b, 14a, 14b Protrusion 15 Bolt hole 16 Chamfer 17a, 17b, 18a, 18b Chord surface 19a, 19b Partial protrusion

Claims (4)

  The valve box is provided with through holes through which the valve shaft is inserted on both sides, the openings on both sides of the through holes are closed with lid members, and the valve shaft inserted through the through hole is rotatably supported. The valve body fixed to the valve shaft is urged in a direction to close the flow path of the valve box and is rotated so as to open the flow path in one direction by the fluid pressure of the flow path. In this case, at least one of the lid members closing the openings on both sides of the valve box is rotatably attached around the valve shaft inserted through the through hole, and a predetermined reference attachment position is provided inside the lid member. Then, there is provided an engaging portion that engages so as to rotate the valve shaft in the rotation direction in which the valve body opens the flow path only when it is rotated from the reference mounting position without being engaged with the valve shaft. A check valve characterized by that.   The means for fixing the rotation position of the said cover member in the state which the engaging part of the said cover member engaged with the said valve shaft and the said valve body rotated so that the flow path might be opened was provided. Check valve described in 1.   The valve shaft was supported rotatably, as the check valve was rotated around two valve bodies that closed the flow path by half around the valve shaft that was passed to the flow path of the valve box. It is assumed that a sleeve member is rotatably fitted to an inner shaft member, and one of the two valve bodies is fixed to the shaft member, and the other valve body is fixed to the sleeve member. Then, the shaft member is rotated in the rotational direction in which the one valve element opens the flow path only when it is rotated from the reference mounting position inside the one lid member that closes the opening. An engaging portion is provided so that the sleeve member is moved in a rotation direction in which the other valve body opens the flow path only when the other lid member is rotated from the reference mounting position inside the other lid member. The check valve according to claim 1 or 2, further comprising an engaging portion that is engaged so as to rotate.   The flow path of the valve box is vertical, the valve body is urged downward by its own weight to close the flow path, and rotates upward to open the flow path with fluid pressure from below the flow path The check valve according to any one of claims 1 to 3.

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