JP3200194U - Ball check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ball-type check valve which can be watertightly connected to a pipe with a simple structure while stably holding a ball at a seated position. SOLUTION: A collar 13 is arranged on an outlet side of a seal member 14 in a passage in a casing 11 so that a ball 12 at a seating position is arranged on an inner peripheral side of a collar 13 made of an annular member. The inlet-side end 35a of the pair of guide ridges 34a that guide the ball 12 into the ball retracting portion 27 has a distance from the inlet-side end of the casing to the inlet-side end of the convex portion 36 in the casing. Is at the same distance as. A screwing member made of a universal nut 16 is screwed into the casing to press the sealing member 14 and the collar 13 against the ends of the guide ridge 34a and the convex portion 36, and the sealing member through the flange portion 52 of the pipe joint 15. The outer peripheral edge 48 is pressed against the end of the casing. [Selection diagram] Fig. 5

Description

  The present invention relates to a ball type check valve.

  2. Description of the Related Art Conventionally, a ball type check valve is known in which a ball when separated from a valve seat is guided to a retracted position where it does not interfere with the forward fluid flow (Patent Document 1). In this ball type check valve, when the ball is separated from the valve seat, the ball is guided along a pair of rail-shaped protrusions into a ball chamber branched from a flow path provided inside the valve box.

  In the ball type check valve of Patent Document 1, a seal member serving as a ball valve seat and a seal packing of an inlet of a valve box is fitted in an annular groove formed at the inlet of the valve box. Thus, the fluid entering the inlet of the valve box is prevented from leaking from the pipe.

Japanese Patent No. 4460774

  In the ball type check valve as described above, when the ball is seated on the valve seat, it is necessary to prevent the ball from moving in the radial direction of the valve seat and stably hold the ball in the seating position. It is. However, the ball check valve of Patent Document 1 does not include a structure that prevents movement of a ball seated on the valve seat when the ball is about to shift in the radial direction of the valve seat.

  An object of the present invention is to provide a ball type check valve capable of watertightly connecting an inflow port to a pipe with a simple structure while stably holding a ball at a seating position.

The ball check valve of the present invention is
A casing in which a passage through which fluid can pass and a ball retracting portion provided by branching from the passage are formed,
A guide protrusion formed between the inlet side portion of the passage and the inside of the ball retracting portion,
A convex portion formed in the passage so that the end on the inlet side is located at the same distance from the end on the inlet side of the guide protrusion from the end on the inlet side of the passage;
A pipe joint having a tubular pipe part and a flange part formed on one end thereof; and
An annular member that is in contact with the inlet side end of the guide protrusion and the inlet side end of the convex portion and is prevented from moving toward the outlet side of the passage;
While being guided by the guide ridge, a ball positioned on the inner peripheral side of the annular member at the sitting position;
An inner peripheral edge portion that is disposed between the flange portion of the pipe joint and the annular member at the inlet side portion of the passage, projects over the inner peripheral side of the annular member, and seats the ball; A seal member having an outer peripheral edge protruding to the outer peripheral side of the member;
The pipe portion of the pipe joint has a through-hole through which is threadedly engaged with the outer peripheral portion of the inlet side end portion of the casing, and the annular member is inserted into the inlet of the guide protrusion via the seal member. A screw that presses the outer peripheral edge of the sealing member against the end of the inlet side of the casing through the flange portion of the pipe joint. And a joint member.

  According to the present invention, the guide protrusion is formed between the inlet side portion of the passage and the inside of the ball retracting portion, and guides the ball separated from the inner peripheral side edge of the seal member to the ball retracting portion. . Thus, the fluid passes through the passage from the inlet side to the outlet side without being obstructed by the ball.

  On the other hand, the annular member is disposed on the inner peripheral side while being prevented from moving toward the outlet side by contact with the inlet side end of the guide protrusion and the inlet side end of the convex portion. The ball at the sitting position is prevented from shifting in the radial direction of the sitting position.

  According to the present invention, the screw member is screwed to the outer peripheral portion of the end portion on the inlet side of the casing, whereby the seal member and the annular member are connected to the inlet side end of the guide protrusion and the inlet side of the convex portion. The outer peripheral edge of the seal member is pressed against the end of the casing via the flange of the pipe joint. Thereby, since an annular member is hold | maintained in an appropriate position, the ball | bowl of a seating position can be hold | maintained stably.

  At the same time, the screwing member optimizes the positioning of the annular member and seals the outer peripheral edge of the seal member. Thereby, the ball type check valve of the present invention can be watertightly connected to the pipe with a simple structure. Furthermore, since the end on the inlet side of the guide ridge is used to prevent the movement of the annular member, the number of projections that prevent the movement of the annular member is reduced by the number of the guide ridge, The structure is further simplified.

  In the ball type check valve of the present invention, the guide protrusion is provided in a pair so as to guide the ball from both sides in the horizontal direction, and only one protrusion is provided. It is preferable that the inlet side end of the section and the inlet side end of the pair of guide protrusions are arranged at equiangular intervals of 120 ° around the center line of the passage.

  According to this configuration, the annular member abuts on the inlet side end of the convex portion and the inlet side end of the pair of guide protrusions arranged at equal angular intervals of 120 ° around the center line of the passage. Thus, movement toward the outlet side is prevented. Thereby, the annular member is prevented from incurring problems such as inclining with contact.

  In the ball type check valve of the present invention, the one convex portion and the pair of guide protrusions are formed apart from the ball at the seating position by a length equal to the radial direction of the passage. The pair of guide protrusions has a protrusion amount from the inner surface of the casing so as to guide the ball sandwiched from both sides at a central angle larger than 120 ° and smaller than 180 ° with respect to the center of the ball. It is preferable that

  According to this configuration, the pair of guide ridges are guided by being sandwiched from both sides at a central angle larger than 120 ° with respect to the center of the ball. Therefore, the pair of guide ridges can stably guide the ball by preventing rolling of the ball during guidance.

The figure which showed the state which incorporated the ball type check valve in piping of a sewage treatment facility. The front view of a ball type check valve. The left view of a ball type check valve. It is the figure which showed the ball-type check valve in the disassembled state before an assembly. FIG. 5 is a cross-sectional view taken along line VV in FIG. 3. The figure which looked at the casing from the inflow port side in the state where only the cap is assembled. FIG. 7A and FIG. 7B are end views of the VIIA-VIIA line and the VIIB-VIIB line of FIG. 5, respectively, showing the relative positions of the balls in the cross section of the elbow tube portion.

  FIG. 1 shows a state in which the ball type check valve 1 is incorporated in piping of a sewage treatment facility. The arrow indicates the flow direction of the sewage in the pipeline that pumps the sewage.

  The vinyl chloride pipe 2, the ball type check valve 1, the one-sided ball valve 3 and the vinyl chloride pipe 4 are arranged in a line from the bottom in the vertical direction, and the vertically adjacent ones are connected to each other. One sewage pressure feed line is constructed. The lower end portion of the vinyl chloride pipe 2 is located below the surface of the sewage in the sewage tank. The unilateral ball valve 3 can be switched between an open position and a closed position as a ball cock by manual operation of a lever.

  The submersible pump 5 is disposed with its lower end aligned with the vertical position of the lower end of the vinyl chloride pipe 2, and the whole is submerged in the sewage in the sewage tank. The operation and stop of the submersible pump 5 are controlled by a manual switch arranged outside the sewage tank. During operation, the submersible pump 5 discharges the sewage sucked from the suction port at the lower end to the lower end of the vinyl chloride pipe 2.

  2 and 3 are a front view and a left side view of the ball check valve 1. The ball type check valve 1 includes a casing 11, a pipe joint 15, a universal nut (screwing member) 16, and a cap 18 as parts that can be visually recognized from the outside. Other parts of the ball check valve 1 will be described later with reference to FIGS.

  An arrow mark M in FIG. 2 is printed on the outer surface of the elbow pipe part 31 to indicate the forward direction of the fluid in the ball check valve 1. The center lines C1 and C2 in FIG. 2 will be described later with reference to FIG.

  1 to 3 show the ball type check valve 1 in a vertically placed state. In the vertically placed state of the ball check valve 1, the outlet 22 of the casing 11 is positioned upward at the upper end of the ball check valve 1. The pipe joint 15 is connected to the lower end portion of the casing 11. The universal nut 16 is screwed into the lower end portion of the casing 11. The cap 18 is screwed onto the side end of the casing 11 in the horizontal direction.

  The ball type check valve 1 may be placed horizontally instead of vertically depending on the place of use. When the ball type check valve 1 is placed horizontally (not shown), the cap 18 is positioned upward at the top of the ball type check valve 1, and the pipe joint 15 and the outlet 22 are located below the cap 18. Located at both ends in the horizontal direction.

  FIG. 4 is a view showing the ball check valve 1 in an exploded state before assembly. The ball check valve 1 in FIG. 4 is shown in a vertically placed state, as in FIGS. The casing 11 has an elbow pipe part 31 that is gently curved in appearance and a straight pipe part 32 that protrudes upward from an intermediate part of the elbow pipe part 31. The inflow port 21 is formed at the lower end of the elbow pipe portion 31. The outlet 22 is formed at the upper end of the straight pipe portion 32. The opening 23 is formed in the horizontal direction at the other end of the elbow pipe portion 31.

  The ball type check valve 1 includes a collar 13, a seal member 14, a pipe joint 15, and a universal nut 16 as members constituting a connection structure for watertightly connecting the inlet side end of the casing 11 to a pipe. ing. The universal nut 16 is screwed into the outer peripheral portion of the end portion on the inlet side of the casing 11 after the ball 12 is loaded from the inlet 21 into the casing 11, and the collar 13, the seal member 14, and the pipe joint 15 are joined to the casing 11. And prevent them from detaching from the casing 11.

  The O-ring 17 is fitted into an annular groove 19 (FIG. 5) formed on the end face on the opening 23 side of the elbow pipe part 31. After the O-ring 17 is fitted, the cap 18 is screwed into the outer peripheral portion of the end portion on the opening 23 side of the casing 11 (hereinafter referred to as “opening end portion”) to close the opening 23. The opening 23 is opened during maintenance or inspection after the ball check valve 1 is connected to a predetermined pipe. The removal of the foreign matter clogged in the casing 11 and the replacement of the worn ball 12 are performed through the opening 23.

  The detailed structure of the components such as the collar 13 in FIG. 4 will be described later with reference to FIG.

  5 is a cross-sectional view taken along line VV in FIG. In FIG. 5, the sitting position Q1 of the ball 12 is indicated by a solid line, and the intermediate position Q2 and the retracted position Q3 are indicated by a two-dot chain line in the movement path. The center line C <b> 1 is a straight line connecting the center of the inlet 21 and the center of the outlet 22, and is also the center line of the straight pipe portion 32. The center line C <b> 2 connects the center of the inflow port 21 and the center of the opening 23, and is the center line of the elbow pipe portion 31.

  The seating position Q1 is a position when the ball 12 is seated on an inner peripheral edge portion 47 as a valve seat of a seal member 14 described later. The retracted position Q3 is a position when the ball 12 is in the ball retracting portion 27 of the casing 11. The intermediate position Q2 is a position when the ball 12 is guided by the guide protrusions 34a and 34b between the seating position Q1 and the retracted position Q3 in the guide path.

  The center line C2 includes a straight line portion on the inlet side that overlaps the center line C1 on the inlet 21 side, and a curved line portion that branches from the center line C1 (see FIG. 2 together with FIG. 5). The curved line portion of the center line C2 is convex on the outlet 22 side. The end portion on the inlet side of the casing 11 corresponds to a range where the center lines C1 and C2 overlap, in other words, a portion of the casing 11 in the range of the straight line portion of the center line C2 and a connection passage 24 described later.

  The casing 11 is manufactured by injection molding of light-colored (eg, blue) and transparent vinyl chloride. The connection passage 24 is a passage through which the fluid can pass through the casing 11, is formed in a straight line in the straight pipe portion 32 with the center line coinciding with the center line C 1, and connects the inlet 21 and the outlet 22. doing. The curved passage 26 is formed in the elbow pipe portion 31 so that the center line thereof coincides with the center line C 2, and connects the inflow port 21 to the opening 23.

  The ball retracting portion 27 is formed as an end portion of the curved passage 26 on the opening 23 side that is not overlapped with the connection passage 24 because the curved passage 26 branches from the connection passage 24 toward the opening 23. When the ball 12 is immersed in the ball retracting portion 27, the ball 12 does not protrude into the connection passage 24.

  The through hole 29 is formed in a wall portion through which the connection passage 24 penetrates in the elbow pipe portion 31, and communicates the inlet 21 and the outlet 22. The cross section of the curved passage 26 (cross section perpendicular to the center line C2) has a circular contour, the diameter of the circle being equal over the entire length of the curved passage 26 and greater than the diameter of the ball 12. Has been. On the other hand, the cross section (cross section perpendicular to the center line C1) of the connection passage 24 has a circular outline in the range from the end on the outflow port 22 side of the through hole 29 to the outflow port 22, and the diameter of the circular shape. Is smaller than the diameter of the circle of the curved passage 26.

  The guide ridges 34a and 34b (FIGS. 5 and 6) are configured so that the elbow pipe portion 31 has a curved half portion on the outer peripheral side (curved side above the center line C2 in the front view of FIG. 5) with respect to the center line C2. When divided into curved halves on the inner peripheral side (the curved side below the center line C2 in the front view of FIG. 5), they are formed on the inner surface of the curved halves on the outer peripheral side. The horizontal interval between the guide ridges 34a and 34b is equal over the entire length.

  FIG. 6 is a view of the casing 11 as seen from the inlet side in a state where only the cap 18 is assembled. The center Oc is a point on the center line C2, and in FIG. 6, the position of the intersection of the center line C2 with the opening surface of the inflow port 21 is shown. In FIG. 6, the through hole 29 is circular, and the circular centers of the inflow port 21, the outflow port 22, and the through hole 29 overlap the center Oc.

  5 and 6, the convex portion 36 is formed on the inner surface of the end portion on the inlet side of the elbow pipe portion 31 so as to protrude from the inner surface toward the center Oc. The amount of protrusion from the inner surface toward the center Oc is set to be equal for both the guide protrusions 34a and 34b and the protrusion 36. The guide protrusions 34 a and 34 b and the convex part 36 have end faces 35 a, 35 b and 37 (inlet side ends of the guide protrusions 34 a and 34 b and the convex part 36) directed toward the inlet side end of the casing 11.

  The end faces 35a, 35b, and 37 are formed in a plane perpendicular to the center line C1 at the same position in the center line direction of the center line C1 (same distance position from the inlet side end of the casing 11). This configuration is shown in FIG. 5 by aligning the end faces 35a and 37 (end positions) on a two-dot chain line A1 perpendicular to the center lines C1 and C2. The end faces 35a, 35b, and 37 are arranged at equiangular intervals of 120 ° around the center Oc as shown in FIG.

  4 and 5, the cylindrical collar 13 includes a flange portion 41 and a cylindrical portion 42 that protrudes from the flange portion 41 toward the seal member 14. The seal member 14 includes an annular substrate portion 45 and an annular raised portion 46 that protrudes from the substrate portion 45 and fits on the outer peripheral side of the cylindrical portion 42 on the inner peripheral side. The substrate portion 45 includes an inner peripheral edge portion 47 and an outer peripheral edge portion 48 that project to the inner peripheral side and the outer peripheral side of the annular raised portion 46. The inner peripheral edge portion 47 functions as a valve seat on which the ball 12 as a valve body is seated, and bulges toward the collar 13 side. The outer peripheral edge 48 bulges toward the pipe joint 15 and serves as a seal packing that seals the peripheral portion of the inlet 21 of the casing 11.

  The pipe joint 15 includes a pipe part 51 extending along the center line C1 and a flange part 52 projecting radially outward at the end of the pipe part 51 on the seal member 14 side (one end side). As shown in FIG. 5, the flange portion 52 also projects a predetermined amount on the inner peripheral side of the pipe portion 51.

  The universal nut 16 includes a cylindrical portion 55 and an overhang portion 56 that protrudes from the end of the cylindrical portion 55 to the inner peripheral side by a predetermined amount. On the inner peripheral portion of the cylindrical portion 55, a female screw that is screwed with a male screw formed on the outer peripheral portion of the end portion on the inlet side of the casing 11 is formed. An inner peripheral side of the overhang portion 56 is a through hole through which the pipe portion 51 of the pipe joint 15 passes.

  The outer diameter of the flange portion 41 of the collar 13 is substantially equal to the inner diameter of the end portion on the inlet side of the elbow pipe portion 31. The outer diameter of the base plate portion 45 of the sealing member 14 and the outer diameter of the pipe portion 51 of the pipe joint 15 are substantially equal to the outer diameter of the end portion on the inlet side of the elbow pipe portion 31.

  The inner peripheral edge 47 as a valve seat of the seal member 14 has an inner diameter smaller than the diameter of the ball 12 and defines the flow rate in the ball check valve 1. The inner diameter of the collar 13 is slightly larger than the diameter of the ball 12. The axial length of the collar 13 is set such that when the ball 12 is seated on the inner peripheral edge portion 47, the upper end of the collar 13 is substantially at the height of the center of the ball 12 and is smaller than the radius of the ball 12. .

  In assembling the parts such as the collar 13 from the inlet 21 into the casing 11, the ball 12 is first loaded into the casing 11. When the ball 12 is loaded from the inlet 21 into the casing 11, the cap 18 is screwed into the casing 11 and the opening 23 is closed in advance.

  Next, the flange part 52 of the pipe joint 15, the seal member 14, and the collar 13 are fitted and inserted on the inner peripheral side of the cylindrical part 55 of the universal nut 16 in order from the bottom to the top. The pipe part 51 of the pipe joint 15 passes through a through hole on the inner peripheral side of the overhang part 56 of the universal nut 16 and is exposed to the outside of the universal nut 16.

  Next, the universal nut 16 is tightened around the inlet side portion of the elbow pipe portion 31. Thereby, the internal thread of the inner surface of the cylindrical part 55 of the universal nut 16 is screwed into the external thread of the outer peripheral part of the inlet side end of the elbow pipe part 31. As the amount of screwing increases, the distance between the end of the inlet side of the casing 11 and the overhanging portion 56 of the universal nut 16 decreases, and the collar 13, the guide protrusions 34a and 34b, and the convex portion 36 The distance of will also shrink.

  Along with this, the outer peripheral edge 48 of the seal member 14 is pinched between the end of the inlet side end and the flange 52 of the pipe joint 15, and this pinching pressure gradually increases. Further, the collar 13 approaches an appropriate position where it abuts on the guide protrusions 34 a and 34 b and the end surfaces 35 a, 35 b and 37 of the convex portion 36.

  The tightening of the universal nut 16 ends when the tightening force becomes sufficiently large. At this time, the clamping pressure of the outer peripheral edge 48 of the seal member 14 reaches a sufficient value, and the sealing of the inlet 21 of the casing 11 is achieved. At the same time, the collar 13 comes into contact with the guide protrusions 34a and 34b and the end faces 35a, 35b and 37 of the convex portion 36 and is positioned at an appropriate position.

  The positioning of the collar 13 at the proper position also makes the positioning of the seal member 14 prevented from moving toward the outlet 22 through the collar 13 proper. Thereby, the ball | bowl 12 can be appropriately seated on the inner peripheral edge part 47 as a valve seat of the seal member 14 positioned at an appropriate position.

  FIG. 7 shows the relative position of the ball 12 in the cross section of the elbow tube section 31. In addition, the cross section of the elbow pipe part 31 shall mean the cross section which cut | disconnected the elbow pipe part 31 by the plane orthogonal to the centerline C2.

  7A and 7B are end views of lines VIIA-VIIA and VIIB-VIIB in FIG. 5, respectively. 7A and 7B correspond to the seating position Q1 and the intermediate position Q2 in the movement path of the ball 12. FIG. The two-dot chain line A1 in FIG. 5 overlaps with the VIIA-VIIA line in FIG. In FIG. 7A, in order to simplify the illustration, the cross section of the universal nut 16 is omitted, and only the inner side of the outer periphery of the inlet side end of the elbow pipe part 31 is shown.

  7A and 7B, the center Oc means the center of the cross section of the elbow pipe section 31, and the center Ob means the center of the ball 12. The inner peripheral contour in the cross section of the elbow pipe part 31 is a circle having the same diameter at the center Oc at any position on the center line C2.

  In FIG. 7A, the center Ob is at the same position as the center Oc. The guide ridges 34a, 34b and the end faces 35a, 35b, 37 of the convex portion 36 are arranged at an equal angle α (= 120 °) around the center Oc. The end faces 35a, 35b, 37 are separated from the ball 12 at the seating position Q1 by a length equal to the radial direction of the connection passage 24 (perpendicular to the center line C1).

  In FIG. 7B, the center Ob is biased toward the through hole 29 with respect to the center Oc. The reason is that the ball 12 receives the pressure of the fluid flowing into the casing 11 from the inlet 21 and is pressed toward the curved half on the outer peripheral side of the elbow pipe portion 31. As a result, as soon as the ball 12 is separated from the inner peripheral edge portion 47, the ball 12 is dropped between the guide protrusions 34a and 34b. The guide ridges 34a and 34b sandwich the ball 12 around the center Ob at a central angle β (α <β <180 °) larger than 120 ° and smaller than 180 ° from both sides in the horizontal direction from the seating position Q1 to the retracted position Q3. I will guide you.

  The operation of the ball check valve 1 will be described.

  While the submersible pump 5 is stopped, no fluid (sewage) is pumped from the submersible pump 5 to the pipe joint 15. Thereby, since the ball 12 does not receive pressure from the inflow port side, the ball 12 descends in the casing 11 due to gravity applied to its own weight, and is maintained at the seating position Q1. At this time, the ball 12 is inserted into the inner peripheral side of the collar 13 with the horizontal cross section passing through the center Ob substantially aligned with the height of the upper end of the collar 13, and is maintained at the seating position Q1.

  When the ball 12 tries to move in the horizontal direction at the seating position Q1, it comes into contact with the inner surface of the collar 13 and is prevented from moving. Thus, the collar 13 plays a role of stably maintaining the ball 12 at the seating position Q1.

  With the operation of the submersible pump 5, the fluid is pumped from the submersible pump 5 to the pipe joint 15. This fluid pushes up the ball 12 at the seating position Q1 against its gravity. As a result, the ball 12 rises in the elbow pipe portion 31.

  At that time, the ball 12 receives the fluid flowing into the casing 11 from the inlet 21 in the hemisphere part on the inlet side and is pushed toward the curved half part on the outer peripheral side of the elbow pipe part 31. As described with reference to FIG. 7B, the guide ridges 34a and 34b are guided by the guide ridges 34a and 34b around the center Ob at the center angle β from both sides in the horizontal direction to the retreat position Q3. Since the central angle β is a sufficiently large angle, the ball 12 is stably guided while the roll is suppressed by the guide protrusions 34a and 34b.

  The ball 12 finally becomes the retracted position Q3. When the ball 12 is in the retracted position Q3, the ball 12 is immersed in the ball retracting portion 27. As a result, the fluid flows into the casing 11 from the inlet 21 and then passes through the connection passage 24 without reaching the outlet 22 without being interrupted by the balls 12.

  Thereafter, when the operation of the submersible pump 5 stops, the upward force on the ball 12 by the pumped fluid from the submersible pump 5 is weakened. Thereby, the ball 12 descends to the collar 13 while being guided by the guide protrusions 34a and 34b. Further, when the pressure of the pumping fluid from the submersible pump 5 suddenly decreases and the upward force on the ball 12 by the pumping fluid decreases at a stretch, the ball 12 is not guided by the guide protrusions 34a and 34b. Then, the guide protrusions 34 a and 34 b are detached from the guide protrusions 34 a and 34 b and fall to the collar 13. In any case, after reaching the collar 13, the ball 12 is guided to the inner peripheral side of the collar 13 and smoothly seated on the inner peripheral edge 47 of the seal member 14.

  In the ball type check valve 1, the end faces 35 a, 35 b, and 37 are provided at equiangular intervals (interval α in FIG. 7A) around the center Oc when viewed from the collar 13 side. As a result, the collar 13 is prevented from incurring problems such as being inclined with respect to the center line C <b> 1 with the contact with the end faces 35 a, 35 b, and 37.

  The end faces 35a and 35b on the inlet side of the guide protrusions 34a and 34b, together with the end face 37 on the inlet side of the convex portion 36, abut the collar 13 and prevent the collar 13 from moving toward the outlet side. To do. Further, the collar 13 prevents the ball 12 at the seating position from coming into contact with the radial direction of the collar 13 and the ball 12 from being displaced from the seating position in the radial direction of the collar 13.

  The advantages of the structure of the ball check valve 1 will be described. In the ball type check valve 1, the universal nut 16 is screwed to the outer peripheral portion of the end portion on the inlet side of the casing 11 when the collar 13, the seal member 14, and the pipe joint 15 are assembled to the casing 11. Accordingly, the universal nut 16 presses the collar 13 through the seal member 14 against the inlets 35a, 35b on the inlet side of the guide protrusions 34a, 34b and the inlet 37 on the inlet side of the projection 36, The outer peripheral edge portion 48 of the seal member 14 is pressed against the end of the casing 11 through the flange portion 52 of the pipe joint 15.

  That is, the sealing member 14 is used as a valve seat for determining the seating position of the ball 12 by appropriately positioning the collar 13 for properly guiding the ball 12 to the valve seat position or for stably holding the ball 12 at the seating position. It is possible to optimize the positioning of the universal nut 16 through proper positioning of the collar 13 and to ensure the watertightness between the pipe joint 15 and the inlet 21 that are connected to the pipe. It is a structure that can be achieved with just that. Further, the ends of the guide protrusions 34a and 34b on the inflow port side prevent the collar 13 from moving and share the function of the convex portion 36, so that the number of convex portions 36 formed can be reduced. Therefore, the ball type check valve 1 having the above-described structure adopts another structure for the structure in which the inflow port can be watertightly connected to the pipe with a simple structure while stably holding the ball 12 in the sitting position. It is more simplified than a ball check valve.

  Although the present invention has been described based on the illustrated embodiment, the present invention is not limited to the embodiment, and may be implemented in forms other than the embodiment.

  For example, in FIGS. 6 and 7A, the central angle of the end faces 35a and 35b with respect to the center Oc is 120 °, but the angle is not limited to 120 ° and may be other angles less than 180 °.

  The convex portion 36 is formed only at the end portion on the inlet side of the elbow pipe portion 31, but is extended to the vicinity of the opening 23 to increase the strength of the elbow pipe portion 31 in the same manner as the guide protrusions 34 a and 34 b. It can also be used as a rib.

  In the embodiment, the cylindrical collar 13 is provided as an annular member, but the ball 12 in the seating position is surrounded from the radially outer side of the valve seat on the side of the connection passage 24 (passage through which fluid can flow), As long as it can prevent the radial displacement of the ball 12, it may be an annular member other than a circle, or an annular member having a predetermined thickness that does not particularly have a cylindrical portion.

DESCRIPTION OF SYMBOLS 1 ... Ball type check valve, 11 ... Casing, 12 ... Ball, 13 ... Collar (annular member), 14 ... Seal member, 15 ... Pipe joint, 16 ... Universal nut (screwing member), 18 ... cap, 21 ... inlet, 22 ... outlet, 23 ... opening, 24 ... connection passage, 26 ... curved passage, 27 ..Ball retracting portion, 31... Elbow tube portion, 32... Straight tube portion, 34a, 34b... Guide ridge, 35a, 35b. -End face, 47 ... inner peripheral edge, 48 ... outer peripheral edge, 51 ... pipe part, 52 ... flange part.

Claims (3)

A casing in which a passage through which fluid can pass and a ball retracting portion provided by branching from the passage are formed,
A guide protrusion formed between the inlet side portion of the passage and the inside of the ball retracting portion,
A convex portion formed in the passage so that the end on the inlet side is located at the same distance from the end on the inlet side of the guide protrusion from the end on the inlet side of the passage;
A pipe joint having a tubular pipe part and a flange part formed on one end thereof; and
An annular member that is in contact with the inlet side end of the guide protrusion and the inlet side end of the convex portion and is prevented from moving toward the outlet side of the passage;
While being guided by the guide ridge, a ball positioned on the inner peripheral side of the annular member at the sitting position;
An inner peripheral edge portion that is disposed between the flange portion of the pipe joint and the annular member at the inlet side portion of the passage, projects over the inner peripheral side of the annular member, and seats the ball; A seal member having an outer peripheral edge protruding to the outer peripheral side of the member;
The pipe portion of the pipe joint has a through-hole through which is threadedly engaged with the outer peripheral portion of the inlet side end portion of the casing, and the annular member is inserted into the inlet of the guide protrusion via the seal member. A screw that presses the outer peripheral edge of the sealing member against the end of the inlet side of the casing through the flange portion of the pipe joint. A ball type check valve comprising: a joint member. The ball check valve according to claim 1,
The guide protrusions are provided as a pair so as to guide the ball from both sides in the horizontal direction,
Only one convex part is provided,
The inlet side end of one of the convex portions and the inlet side end of the pair of guide protrusions are arranged at equiangular intervals of 120 ° around the center line of the passage. Ball type check valve. The ball check valve according to claim 2,
The one protrusion and the pair of guide protrusions are formed apart from the ball at the seating position by a length equal to the radial direction of the passage,
The pair of guide ridges are set to project from the inner surface of the casing so that the balls are guided from both sides at a central angle larger than 120 ° and smaller than 180 ° with respect to the center of the ball. A ball-type check valve characterized by