WO2020110391A1

WO2020110391A1 - Ball-type check valve, valve assembly, and reciprocating pump

Info

Publication number: WO2020110391A1
Application number: PCT/JP2019/033389
Authority: WO
Inventors: 藤原　一生
Original assignee: 日機装エイコー株式会社
Priority date: 2018-11-29
Filing date: 2019-08-26
Publication date: 2020-06-04
Also published as: JP7065019B2; JP2020085195A; TW202024508A

Abstract

A ball-type check valve is provided with: substantially cylindrical ball guides (64D, 64U), the bottom surface of which is completely open and the top surface of which has formed therein a fluid outlet; substantially disc-shaped valve seats (68) which are fitted respectively into the openings of the bottom surfaces of the ball guides, thereby forming a valve chamber between the valve seats and the respective upper surfaces of the ball guides (64D, 64U), said disc-shaped valve seats (68) having formed in the center thereof a fluid inlet (82) for a fluid, the upper surface of the valve seats functioning as a valve seat surface (84); and ball valves (66) which are arranged inside the respective valve chambers and closely adhere to the valve seat surfaces (84), thereby interrupting the passage of the fluid. Flanges (92) extend from the outer circumferential edge of a base portion of the valve seats (68) farther radially outward than the inner diameter of the ball guides (64D, 64U).

Description

Ball check valve, valve assembly, and reciprocating pump

In the present specification, a ball-type check valve that prevents backflow of liquid by closely adhering a ball valve to a valve seat surface, a valve assembly in which two ball-type check valves are combined, and the ball-type check valve Alternatively, a reciprocating pump incorporating a valve assembly is disclosed.

Conventionally, a ball-type check valve that prevents backflow of liquid by closely contacting the ball valve with the valve seat surface has been widely known. Such a ball type check valve has been provided in the middle of the suction passage and the discharge passage in a reciprocating pump, for example. The suction passage is a passage for guiding the liquid from the outside to the pump chamber, and the discharge passage is a passage for guiding the liquid from the pump chamber to the outside.

The ball-type check valve has a ball guide 64, a valve seat 68, and a ball valve 66, as shown in FIG. The ball guide 64 is a substantially cylindrical member, and a liquid outlet 70 is formed on the upper surface thereof. The valve seat 68 is made of a flexible material, and is fitted in the bottom opening of the ball guide 64 in a liquid-tight manner. A hole serving as a liquid inlet 82 is formed in the center of the valve seat 68, and an upper surface of the valve seat 68 serves as a valve seat surface, and a space between the upper surface of the valve seat 68 and the upper surface of the ball guide 64 is formed. , 72 and the valve chamber. A ball valve 66 is arranged in the valve chamber 72. When the liquid flows from the inflow port 82 to the outflow port 70, the ball valve 66 is lifted by the pressure of the liquid in a direction away from the upper surface (valve seat surface) of the valve seat 68, and allows the passage of the liquid. On the other hand, when the liquid tries to flow from the outflow port 70 to the inflow port 82, the ball valve 66 is pressed against the valve seat surface by the pressure of the liquid, so that the passage of the liquid is hindered.

It is desirable that such a ball check valve can be disassembled for maintenance. However, the conventional ball check valve has a problem that it is difficult to disassemble. That is, in the conventional ball check valve, as is apparent from FIG. 8, the valve seat 68 is completely fitted inside the cylindrical ball guide 64. Further, as a matter of course, the outer peripheral surface of the valve seat 68 is liquid-tightly adhered to the inner peripheral surface of the ball guide 64 in order to prevent liquid leakage. As a result, in order to remove the valve seat 68 from the ball guide 64, it was necessary to insert a tapered member, for example, a needle, into the inflow port 82 and pry the valve seat 68 with the tapered member. Such work is not only time-consuming, but also may damage the valve seat 68 and the ball valve 66 and impair proper liquid tightness.

Therefore, in the present specification, an easily disassembled ball-type check valve, a valve assembly, and a reciprocating pump in which these are incorporated are disclosed.

A ball-type check valve for preventing backflow of liquid by closely adhering a ball valve to a valve seat surface, which is a substantially cylindrical ball guide having a fully opened bottom surface and an outlet for the liquid formed on the upper surface. And a substantially disc-shaped valve seat fitted in an opening on the bottom surface of the ball guide to form a valve chamber between the valve guide and the upper surface of the ball guide, and a liquid inlet is formed in the center thereof. Along with, a substantially disc-shaped valve seat whose upper surface functions as the valve seat surface, and a ball valve that is disposed in the valve chamber and that blocks the passage of liquid by closely contacting the valve seat surface, A flange extending from the outer peripheral edge of the bottom portion of the valve seat to the outer side in the radial direction with respect to the inner diameter of the ball guide extends.

In this case, the flange is formed only in a part of the valve seat in the circumferential direction, and the ball guide is a cutout portion formed by cutting out a lower portion of the peripheral surface including a lower end edge thereof. You may have the notch part which forms the space which accommodates a flange.

Further, the valve seat is a bottom portion on which the flange is formed, an upper portion of the bubble seat including the valve seat surface, and a valve seat portion having a diameter smaller than an inner diameter of the ball guide, the bottom portion and the valve. And a seal portion that is located between the seat portion and closely contacts the inner peripheral surface of the ball guide.

The valve assembly disclosed in the present specification includes a first valve that is the ball-type check valve and a second valve that is the ball-type check valve and that is disposed below the first valve. And a valve, the lower part of the first valve being fitted to the upper part of the second valve.

Further, the reciprocating pump disclosed in the present specification is a reciprocating pump that sucks and discharges fluid by reciprocating a diaphragm facing the pump chamber, and in the middle of a suction passage and a discharge passage communicating with the pump chamber. Is provided with the ball check valve or the valve assembly described above.

According to the ball-type check valve disclosed in the present specification, the valve seat has the flange that extends outward in the radial direction from the inner diameter of the ball guide, so that the valve seat can be easily removed from the ball guide. As a result, the maintainability of the ball check valve, the valve assembly, and the reciprocating pump incorporating them can be improved.

It is sectional drawing of the pump part of a reciprocating pump. It is an exploded perspective view of a pump part. It is an exploded perspective view of a valve assembly. It is sectional drawing in the XZ plane of a valve assembly. It is a sectional view in the YZ plane of a valve assembly. It is sectional drawing which decomposed|disassembled and showed FIG. It is sectional drawing which decomposed|disassembled and showed FIG. FIG. 6 is a cross-sectional view of a conventional valve assembly.

Hereinafter, the configuration of the reciprocating pump 10 incorporating the ball type check valve will be described with reference to the drawings. FIG. 1 is a sectional view of the pump portion 12 of the reciprocating pump 10, and FIG. 2 is an exploded perspective view of the pump portion 12. The reciprocating pump 10 is roughly divided into a pump unit 12 through which the target liquid flows and a drive unit (not shown) that reciprocates the diaphragm 18. The pump portion 12 has a substantially disk-shaped or substantially elliptical plate-shaped diaphragm head 14, and a recess 16 is formed at one end of the diaphragm head 14 in the thickness direction. The recess 16 is covered with a diaphragm 18 made of a flexible material, and a space between the diaphragm 18 and the recess 16 serves as a pump chamber 22. A shaft 23 extending in the horizontal direction is connected to the diaphragm 18. The drive unit is provided with a mechanism for reciprocating the shaft in the horizontal direction. As the mechanism of the drive unit, for example, an electromagnetic plunger or the like can be used. Since a conventional technique can be used for the configuration of the driving unit, detailed description thereof will be omitted.

The pump portion 12 has a common passage 36 extending horizontally from the pump chamber 22, a suction passage 38 extending substantially vertically from the lower end of the pump portion 12 toward the common passage 36, and a common passage 36 extending from the common passage 36 to the pump portion 12. A discharge passage 42 that extends in a substantially vertical direction toward the upper end and a gas vent passage 50 that communicates with the discharge passage 42 (more accurately, the discharge valve 30D) are provided.

A suction valve 30S, which is a check valve that allows only the flow from the suction port 40 to the common path 36, is provided in the middle of the suction passage 38. Further, in the middle of the discharge passage 42, a discharge valve 30D that is a check valve that allows only the flow from the common passage 36 to the discharge port 44 is provided. Each of the suction valve 30S and the discharge valve 30D is a valve assembly 32 that is a combination of two ball check valves 62. The specific configuration of the valve assembly 32 will be described later.

A boss 46 protruding in the horizontal direction is formed at the other end of the pump portion 12 in the thickness direction. A valve insertion hole 51 that extends horizontally from the end surface of the boss 46 to the side surface of the discharge valve 30D and that communicates with the gas vent passage 50 extends. A female screw is formed on the inner peripheral surface of the valve insertion hole 51.

The gas vent valve 54 is a valve that is screwed into the valve insertion hole 51 and switches communication/blocking between the discharge passage 42 and the external space. Inside the gas vent valve 54, a discharge passage 56 that connects the valve insertion hole 51 and the external space is formed. An O-ring 52 is provided between the gas vent valve 54 and the valve insertion hole 51, and when the gas vent valve 54 is completely closed, the discharge passage 42 and the external space are completely shut off. On the other hand, when the gas vent valve 54 is appropriately loosened, the discharge passage 42 and the external space are communicated with each other through the gas vent passage 50, the valve insertion hole 51, and the discharge passage 56. As a result, the gas accumulated in the discharge passage 42 is released to the outside.

Mechanically, the pump unit 12 has a diaphragm head 14, a suction side hose joint 24S, a discharge side hose joint 24D, and the like. The diaphragm head 14 is a substantially disc-shaped member, and a common passage 36, a suction passage 38, and a discharge passage 42 are formed inside thereof. Further, the upper and lower ends of the diaphragm head 14 are provided with connecting portions 45 for connecting the suction side hose joint 24S and the discharge side hose joint 24D. The connection portion 45 is a substantially circular hole, and an internal thread that can be screwed into the suction side/discharge side hose joint 24D is formed on the inner peripheral surface thereof.

The suction-side hose joint 24S is a substantially tubular member having a hole penetrating in the axial direction and functioning as the suction passage 38. The discharge-side hose joint 24D is a substantially tubular member having a hole penetrating in the axial direction and penetrating as the discharge passage 42.

The axial ends of the suction-side and discharge-

side hose joints

24S and 24D are screwed to the connecting portion 45 of the diaphragm head 14. The suction-side/discharge-

side hose joints

24S and 24D have a substantially circular recess formed on one axial end surface. Therefore, when the suction side/discharge side hose joints 24S, 24D are screwed and connected to the diaphragm head 14, the valve assembly 32 is housed between the suction side/discharge side hose joints 24S, 24D and the diaphragm head 14. A valve space 29 is formed.

Union collars

28S and 28D are attached to the other axial ends of the suction-side and discharge-

side hose joints

24S and 24D by means of

union nuts

26S and 26D.

The operation of the reciprocating pump 10 having the above configuration will be briefly described. When the diaphragm 18 retracts (moves to the right in FIG. 1) and the pump chamber 22 expands, the discharge valve 30D is closed and the suction valve 30S is opened. Then, as a result, the target fluid flows from the suction port 40 into the pump chamber 22. When the diaphragm 18 advances and the pump chamber 22 is compressed, the suction valve 30S is closed and the discharge valve 30D is opened. As a result, the target fluid in the pump chamber 22 is discharged to the outside through the discharge passage 42. By repeating the forward/backward movement of the diaphragm 18, the target fluid is pumped. Further, when the gas stays in the discharge passage 42 and the pump action is reduced, the gas vent valve 54 is opened. As a result, the gas accumulated around the discharge valve 30D is released to the outside, and the deterioration of the pump action is improved.

By the way, the reciprocating pump 10 is appropriately disassembled for maintenance such as cleaning and parts replacement. At the time of this disassembly, the valve assembly 32, which is the suction valve 30S and the discharge valve 30D, is also removed from the valve space 29 and disassembled. In this example, the valve assembly 32 has a special structure to simplify the disassembling work of the valve assembly 32 and to improve the maintainability of the reciprocating pump 10. The configuration of the valve assembly 32 will be described below. Since the suction valve 30S and the discharge valve 30D have the same configuration, they will be described below without distinguishing between them.

FIG. 3 is an exploded perspective view of the valve assembly 32. 4 is a cross-sectional view of the valve assembly 32 taken along the XZ plane, and FIG. 5 is a cross-sectional view taken along the YZ plane. 6 and 7 are cross-sectional views showing exploded views of FIGS. 4 and 5. In the following description, the Z direction is the axial direction of the valve assembly 32 (the direction in which the target fluid flows), the X direction is orthogonal to the Z direction, and the Y direction is orthogonal to the X and Z directions. Direction. In the following description, the axial direction, the circumferential direction, and the radial direction mean the axial direction, the circumferential direction, and the radial direction of the valve assembly 32, unless otherwise specified. Further, in the following description, for convenience, the upstream side (the lower side of the paper in FIGS. 4 to 7) of the flow of the target fluid will be referred to as “lower”, and the downstream (the upper side of the paper in FIGS. 4 to 7) will be referred to as the “upper”. ..

The valve assembly 32 is a check valve assembly that allows only the target fluid to flow from the upstream side to the downstream side. The valve assembly 32 is configured by connecting two check valves, that is, an upstream check valve 60U (first valve) and a downstream check valve 60D (second valve) side by side in the axial direction. The downstream check valve 60D is arranged downstream of the upstream check valve 60U in the flow direction.

The downstream check valve 60D has a downstream ball guide 64D, a ball valve 66, and a valve seat 68. The downstream ball guide 64D is a substantially cylindrical member, and an outlet 70 through which the target fluid flows out is formed on the upper end surface. The bottom surface of the downstream ball guide 64D is completely opened. The valve seat 68 is fitted into the bottom opening of the downstream ball guide 64D. A space between the upper surface of the valve seat 68 and the upper surface of the downstream ball guide 64D becomes a valve chamber 72 in which the ball valve 66 is arranged. A plurality of protrusions 74 that project into the valve chamber 72 are provided on the upper portion of the valve chamber 72. The projection 74 contacts the ball valve 66 before the ball valve 66 contacts the outlet 70, thereby preventing the outlet 70 from being blocked.

The lower end of the downstream ball guide 64D extends below the lower end of the valve seat 68. The lower portion of the downstream ball guide 64D functions as a fitting portion 78 that is fitted and fitted to the outer periphery of the upper portion of the upstream ball guide 64U described later. A cutout portion 76 for accommodating a flange 92 of the valve seat 68, which will be described later, is provided below the downstream ball guide 64D. The notch 76 is formed by notching the lower peripheral surface including the lower end edge of the downstream ball guide 64D. In this example, two notches 76 are provided at intervals in the circumferential direction.

The ball valve 66 is a sphere arranged in the valve chamber 72. The ball valve 66 is in close contact with the upper surface (valve seat surface 84) of the valve seat 68 to impede the flow of the target fluid, and is separated from the upper surface of the valve seat 68 to move the target fluid from the upstream side to the downstream side. Flow is allowed.

The valve seat 68 is a substantially disc-shaped seat made of a flexible material such as rubber. At the center of the valve seat 68, a hole serving as an inflow port 82 for the target fluid is formed. The diameter of the inflow port 82 is smaller than the diameter of the ball valve 66. Further, the upper surface of the valve seat 68 functions as a valve seat surface 84 with which the ball valve 66 can be in close contact. In addition, in order to improve the adhesion with the ball valve 66, the valve seat surface 84 has a mortar shape whose diameter increases as it approaches the end in the axial direction.

The valve seat 68 is roughly divided into three parts in the axial direction, namely, a valve seat part 86, a seal part 88, and a bottom part 90. The valve seat portion 86 is a portion including the valve seat surface 84 described above. The outer diameter of the valve seat portion 86 is sufficiently smaller than the inner diameter of the downstream ball guide 64D, and there is a sufficient gap between the outer peripheral surface of the valve seat portion 86 and the inner peripheral surface of the downstream ball guide 64D. Has been formed.

The seal portion 88 is a portion connected to the lower side of the valve seat portion 86. The outer diameter of the seal portion 88 is substantially the same as or slightly larger than the inner diameter of the downstream ball guide 64D, and the outer peripheral surface of the seal portion 88 is liquid-tightly adhered to the inner peripheral surface of the downstream ball guide 64D. is doing. In other words, the outer peripheral surface of the seal portion 88 functions as a seal surface that liquid-tightly fits the valve seat 68 to the downstream ball guide 64D. Further, since the seal portion 88 is fitted to the inner peripheral surface of the downstream side ball guide 64D, the valve seat 68 does not come off from the downstream side ball guide 64D without permission, and the valve seat when the valve assembly 32 is disassembled. The loss of 68 can be effectively prevented.

The bottom portion 90 is a portion that extends further below the seal portion 88. The outer diameter of the bottom portion 90 is larger than the outer diameter of the seal portion 88, and a step exists between the both

portions

88 and 90. A step corresponding to the step between the seal portion 88 and the bottom 90 is formed on the inner peripheral surface of the downstream ball guide 64D. The stepped surface of the downstream side ball guide 64D abuts on the upper surface of the bottom portion 90 and is in liquid-tight contact therewith. That is, the upper surface of the bottom portion 90 also functions as a sealing surface. Further, a flange 92 is provided on the outer peripheral surface of the bottom portion 90 so as to project radially outward. As shown in FIG. 3, the flange 92 is provided only in a part of the circumferential direction (for example, only 60 degrees). In this example, two flanges 92 are provided, one at a position symmetrical with 180 degrees and a total of two.

The flange 92 projects to a position radially outside the inner diameter of the downstream ball guide 64D and inside the outer diameter. Further, as described above, the cutout portion 76 is provided in the lower portion of the peripheral surface of the downstream side ball guide 64D so as to avoid interference with the flange 92, and the flange 92 is provided in the cutout portion 76. Be accommodated. Therefore, when the valve assembly 32 is assembled, the outer peripheral end surface of the flange 92 can be accessed through the cutout portion 76. When the downstream ball guide 64D is attached to the upstream ball guide 64U, the distance from the mounting surface of the valve seat 68 (that is, the upper end surface of the upstream ball guide 64U) to the upper surface of the flange 92 is equal to the mounting surface. Is smaller than the distance from the upper end of the cutout portion 76. Therefore, the upper end surface of the cutout portion 76 is liquid-tightly adhered to the upper surface of the flange 92, so that the sealing performance is secured.

The upstream check valve 60U has an upstream ball guide 64U, a ball valve 66, and a valve seat 68. Of these, the ball valve 66 and the valve seat 68 of the upstream check valve 60U have substantially the same structure as that of the downstream check valve 60U. Similar to the downstream ball guide 64D, the upstream ball guide 64U is a substantially cylindrical member having an outflow port 70 formed on the upper surface thereof, and a cutout portion 76 for accommodating the flange 92 is provided in the lower portion thereof. ing. Even in the upstream check valve 60U, the stepped surface of the upstream ball guide 64U and the upper end surface of the notch 76 are liquid-tightly sealed and sealed to the bottom 90 and the flange 92 of the valve seat 68. ..

Further, a fitted portion 80 into which the lower portion of the downstream ball guide 64D is fitted is provided on the outer periphery of the valve seat portion 86 of the upstream ball guide 64U. The diameter of the upstream side ball guide 64U is reduced so that a gap is formed between the upstream side ball guide 64U and the diaphragm head 14. A communication hole 94 that communicates with the inside and outside of the downstream ball guide 64D is formed in the reduced diameter portion 81. Then, the valve chamber 72 and the degassing passage 50 are communicated with each other through the communication hole 94.

Here, as described above, in this example, the bottom portion 90 of the valve seat 68 is provided with the flange 92 protruding outward in the radial direction. With such a configuration, the valve seat 68 can be easily removed from the ball guides 64U and 64D, and the check valve 62 can be easily disassembled. This will be described in comparison with the conventional valve assembly 32. FIG. 8 is a sectional view of a conventional valve assembly 32.

The conventional valve assembly 32 also has an upstream check valve 60U and a downstream check valve 60D, as in this example. The upstream check valve 60U and the downstream check valve 60D each include ball guides 64U and 64D, a ball valve 66, and a valve seat 68. However, in the conventional check valve 62, the valve seat 68 does not have the flange 92. Therefore, in the conventional check valve 62, the valve seat 68 is entirely housed in the ball guides 64U and 64D. Here, in order to prevent leakage, the outer peripheral surface of the valve seat 68 and the inner peripheral surfaces of the ball guides 64U and 64D are in liquid-tight contact with each other, and the valve seat 68 fitted into the ball guides 64U and 64D is in contact. It was difficult to grasp the outer peripheral edge with fingers. Therefore, when removing the valve seat 68 from the ball guides 64U and 64D, conventionally, it was necessary to insert a tapered member, for example, a needle, into the inflow port 82 of the valve seat 68 and pry the valve seat 68. However, such work is not only troublesome, but also may cause damage to the valve seat 68, the ball valve 66, and the like.

In this example, as described above, the bottom portion 90 of the valve seat 68 is provided with the flange 92 protruding from the inner peripheral edge of the ball guides 64U and 64D to the outer side in the radial direction. The outer peripheral edge of the flange 92 can be accessed from the side surfaces of the ball guides 64U and 64D. Therefore, the user can easily grasp the outer peripheral edge of the flange 92 with fingers. Thus, the valve seat 68 can be easily removed from the ball guides 64U, 64D without damaging the valve seat 68 or the ball valve 66.

The outer diameter of the flange 92 is smaller than the outer diameters of the ball guides 64U and 64D. This is because when the flange 92 elastically deforms and spreads outward in the radial direction, the flange 92 does not protrude outside the outer diameter of the ball guides 64U and 64D. That is, as described above, the flange 92 is pressed by the upper end surface of the cutout portion 76 and compressed in the axial direction in order to secure the sealing property. Along with this, the flange 92 elastically deforms so as to expand outward in the radial direction. When the expanded flange 92 expands outside the outer diameter of the ball guides 64U, 64D, it is caught by the inner peripheral surface of the valve space 29. However, it becomes difficult to remove the valve assembly 32 from the valve space 29 during disassembly. Therefore, the outer diameter of the flange 92 under no load is smaller than the outer diameter of the ball guides 64U and 64D.

Also, the valve seat 68 of the conventional check valve has a substantially constant outer diameter, making it difficult to distinguish the top and bottom. As a result, when reassembling the valve seat 68 to the ball guides 64U and 64D, it is easy to mistakenly make a mistake in assembling the valve seat 68 upside down. On the other hand, in this example, the bottom portion 90 of the valve seat 68 is provided with the flange 92 larger than the inner diameters of the ball guides 64U and 64D. Therefore, when the valve seat 68 is turned upside down, the valve seat 68 cannot be fitted into the ball guide, and erroneous assembly can be reliably prevented.

Further, in this example, the lower portion (fitting portion 78) of the downstream ball guide 64D is fitted to the upper portion (fitted portion 80) of the upstream ball guide 64U. Therefore, even if the valve assembly 32 is taken out of the valve space 29, the upstream check valve 60U and the downstream check valve 60D remain connected. As a result, it is possible to effectively prevent a mistake such as accidentally dropping one of the upstream check valve 60U and the downstream check valve 60D.

Also, as described above, in this example, the flange 92 and the valve seat 68 are provided only in a partial range in the circumferential direction. With such a configuration, the downstream ball guide 64D and the upstream ball guide 64U can be connected. That is, when the flange 92 is provided over the entire circumference of the valve seat 68, the lower end of the downstream ball guide 64D cannot be extended below the lower end of the valve seat 68. As a result, the lower portion of the downstream ball guide 64D cannot be fitted into the upstream ball guide 64U. As a result, when the valve assembly 32 is removed from the diaphragm head 14 or the like, the two

check valves

60U and 60D are easily disassembled. On the other hand, in this example, the flange 92 is provided only in a partial range in the circumferential direction of the valve seat 68. With this configuration, the lower end of the downstream ball guide 64D can be extended below the lower end of the valve seat 68, and the downstream ball guide 64D can be fitted to the upstream ball guide 64U.

Further, in the conventional check valve, as shown in FIG. 8, the outer diameter thereof is constant, and the outer diameter of the valve seat portion 86 including the valve seat surface 84 is slightly larger than the inner diameters of the ball guides 64U and 64D. .. Therefore, when the valve seat 68 is fitted into the ball guides 64U and 64D, the valve seat portion 86 receives a radial compression force from the inner peripheral surfaces of the ball guides 64U and 64D. By receiving such a force, the valve seat portion 86 of the valve seat 68 may be distorted and the shape of the valve seat surface 84 may change. Such deformation of the valve seat surface 84 causes a decrease in adhesion with the ball valve 66.

On the other hand, in this example, the outer diameter of the valve seat portion 86 including the valve seat surface 84 is made sufficiently smaller than the inner diameters of the ball guides 64U and 64D. As a result, almost no radial compression force is applied to the valve seat portion 86, and the deformation of the valve seat surface 84 is effectively prevented. And thereby, the adhesion between the valve seat surface 84 and the ball valve 66 can be appropriately maintained.

The above-mentioned configuration is an example, and at least the flange 92 extending from the outer peripheral edge of the bottom portion 90 of the valve seat 68 to the outer side in the radial direction with respect to the inner diameters of the ball guides 64U and 64D extends. The configuration may be changed as appropriate. For example, the number and shape of the flanges 92 may be changed appropriately. Further, in this example, the flange 92 is provided only in a part in the circumferential direction, but the flange 92 may be provided over the entire circumference of the valve seat 68. Further, the shape of the valve seat 68 may be appropriately changed, and, for example, the valve seat portion 86 may also be shaped so as to be in close contact with the inner peripheral surfaces of the ball guides 64U and 64D, like the seal portion 88. Further, in this example, the ball guides 64U and 64D are configured to be liquid-tightly adhered to the bottom portion 90 of the valve seat 68 and the upper surface of the flange 92, but an appropriate gap may be provided between them. With such a configuration, elastic deformation of the valve seat 68 due to pressing can be suppressed.

In the above description, the two

check valves

60U and 60D are combined to form the valve assembly 32, but the

check valves

60U and 60D described above may be used alone. The

check valves

60U and 60D and the valve assembly 32 described above may be incorporated not only in the reciprocating pump 10 but also in other devices.

10 reciprocating pumps, 12 pump parts, 14 diaphragm heads, 16 recesses, 18 diaphragms, 22 pump chambers, 23 shafts, 24D discharge side hose joints, 24S suction side hose joints, 26D, 26S union nuts, 28D, 28S union collars, 29 valve spaces, 30D discharge valves, 30S suction valves, 32 valve assemblies, 36 common passages, 38 suction passages, 40 suction ports, 42 discharge passages, 44 discharge ports, 45 connection parts, 46 bosses, 50 degassing passages, 52O Ring, 54 gas vent valve, 56 discharge passage, 60D downstream check valve, 60U upstream check valve, 62 ball type check valve, 64 ball guide, 64D downstream ball guide, 64U upstream ball guide, 66 ball Valves, 68 valve seats, 70 outlets, 72 valve chambers, 74 protrusions, 76 notches, 78 mating parts, 80 mated parts, 81 reduced diameter parts, 82 inflow ports, 84 valve seat surfaces, 86 valve seats Part, 88 seal part, 90 bottom part, 92 flange, 94 communication hole.

Claims

A ball-type check valve that prevents backflow of liquid by closely adhering the ball valve to the valve seat surface,
A substantially cylindrical ball guide in which the bottom surface is completely opened and the liquid outlet is formed on the top surface,
A substantially disc-shaped valve seat that is fitted into the bottom opening of the ball guide to form a valve chamber between the ball guide and the upper surface of the ball guide, and a liquid inlet is formed in the center thereof. A substantially disc-shaped valve seat whose upper surface functions as the valve seat surface,
A ball valve that is disposed in the valve chamber and blocks liquid passage by closely contacting with the valve seat surface;
A flange extending from the outer peripheral edge of the bottom portion of the valve seat to the outer side in the radial direction with respect to the inner diameter of the ball guide,
A ball-type check valve characterized in that
The ball-type check valve according to claim 1,
The flange is formed only in a part of the valve seat in the circumferential direction,
The ball guide is a cutout portion formed by cutting out a lower peripheral surface including a lower end edge thereof, and has a cutout portion that forms a space in which the flange is housed.
A ball-type check valve characterized in that
The ball check valve according to claim 1 or 2, wherein
The valve seat is
A bottom portion on which the flange is formed,
An upper portion of the bubble seat including the valve seat surface, a valve seat portion having a diameter smaller than the inner diameter of the ball guide,
A seal portion that is located between the bottom portion and the valve seat portion, and that is in close contact with the inner peripheral surface of the ball guide,
A ball-type check valve comprising:
A first valve which is the ball-type check valve according to any one of claims 1 to 3,
The ball check valve according to any one of claims 1 to 3, wherein the second valve is arranged below the first valve,
A valve assembly having
A lower portion of the first valve is fitted to an upper portion of the second valve,
A valve assembly characterized in that.
A reciprocating pump that sucks and discharges fluid by reciprocating a diaphragm facing the pump chamber,
The ball check valve according to any one of claims 1 to 3 or the valve assembly according to claim 4 is provided in the middle of a suction passage and a discharge passage communicating with the pump chamber.
A reciprocating pump characterized in that