JPH0532777U - Reciprocating pump valve device - Google Patents

Abstract

(57) [Abstract] [Purpose] The opening of the fluid passage can be reliably closed without the valve element shifting or coming off, and the fatigue fracture due to stress concentration is prevented by eliminating the threaded portion of the passage for high pressure fluid. . A concave portion 8 of a cylinder head 1 that closes a cylinder chamber 5 is closed by a convex portion 15 of a body 2, and a first valve body 37 that slides in contact with a side wall of the concave portion 8 is housed in the concave portion 8. The spring 38 presses the first valve element 37 toward the convex portion 15 to close the opening of the second passage 30. Since the first valve body 37 does not shift its position or come off from the recessed portion 8, the opening of the second passage 30 can be reliably closed. Further, since there is no threaded portion in the high pressure fluid passages 10, 42, 34, 60, 50, stress concentration does not occur and fatigue failure does not occur. Further, the gaskets 61 and 62 are provided on both sides of the valve seat 53, and the V-shaped groove 61 is provided.
By providing v and 62v so that the gaskets 61 and 62 bite into the V-shaped groove, it is possible to reliably prevent the high-pressure fluid from leaking.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a valve device for use with a reciprocating pump.

[0002]

[Prior Art]

 Normally, this type of valve device connects the pump-side opening, the low-pressure side opening, and the high-pressure side opening with a T-shaped passage, and the T-shaped passage has a low-pressure side passage and a high-pressure side passage, respectively. A check valve is provided so that low-pressure fluid is sucked into the pump cylinder from the low-pressure side opening through the pump-side opening during the pump suction stroke, and the high-pressure fluid discharged from the pump cylinder during the pump discharge stroke. It is common that the high-pressure fluid is discharged from the high-pressure side opening through the pump-side opening, but since the high-pressure fluid discharged from the pump cylinder collides with the intersection of the T-shaped passage, There was a drawback that fatigue fracture was likely to occur due to stress concentration at the intersection.

Therefore, in order to eliminate such a defect, a valve device has been proposed in which a passage extending from the pump-side opening to the high-pressure side opening is formed in a linear shape so that collision of high-pressure fluid does not occur. 3 (Japanese Patent Publication No. 63-18032). This valve device is used with a high-pressure reciprocating pump, and an inlet check valve 75 is provided in a pump-side convex portion 74 of a main body 73 having a low-pressure passage 71 and a high-pressure passage 72 therein, and an outlet-side concave portion 76 is provided therein. It has a structure in which outlet check valves 77 are attached respectively. The inlet check valve 75 includes a valve body 80 for closing the low pressure passage 71, a leaf spring 81 for pressing the valve body 80 against the main body convex portion 74, and a gap between the leaf spring 81 and the convex portion 74. And a screw member 83 for attaching the leaf spring 81 to the convex portion 74 via the spacer 82. The screw member 83 is screwed into the high pressure passage 72 and is hollow so that high pressure fluid from a reciprocating pump (not shown) is introduced into the high pressure passage 72. In the suction stroke of the reciprocating pump, the fluid pressure inside the cylinder becomes equal to or lower than the fluid pressure inside the low pressure passage 71, and the valve body 80 is pushed against the spring force of the leaf spring 81 toward the pump side, and A gap is generated between the convex portion 74 and the supply fluid from the low pressure line 86 is sucked into the cylinder from the low pressure passage 71 through the gap. Further, in the discharge stroke of the reciprocating pump, the pressure in the cylinder becomes higher than the pressure in the low pressure passage 71, so the valve body 80 is pressed against the convex portion 74, and the discharge fluid from the cylinder flows into the low pressure passage 71. Prevent from doing. On the other hand, the outlet check valve 77 is slidable in a valve seat 90, an outlet housing 91 that holds the valve seat 90 by being screwed into an outlet side recess 76 of the main body, and a valve chamber 92 of the outlet housing 91. It is composed of a stored valve element 93 and a spring 94 for pressing the valve element 93 against the valve seat 90. The valve seat 90 has a flat outer surface 95, a slightly beveled inner surface 97 and a passage 96 of a diameter slightly larger than the diameter of the high pressure passage 72. Further, the valve body 93 has a shoulder portion 98 that is slidably contacted with the valve chamber 92, an axial passage 100 that communicates with a communication passage 99 in the outlet housing 91 and extends to a position just before the shoulder portion 98, and the shoulder portion 98. Immediately before the portion 98, there is a passage 101 that extends in the radial direction and connects the axial passage 100 to the valve chamber 92. During the suction stroke of the reciprocating pump, the pressure in the high-pressure passage 72 is low, so the force of the spring 94 overcomes the pressure and pushes the valve element 93 against the valve seat 90, and from the outlet side to the high-pressure passage 72 side. Prevents backflow of fluid to the. Further, in the discharge stroke of the reciprocating pump, the pressure in the high-pressure passage 72 rises to overcome the force of the spring 94, the valve body 93 separates from the valve seat 90, and a gap is formed between the valve body 93 and the valve seat 90. Occurs, the fluid sent to the high pressure passage 72 is sent from the passage 96 to the valve chamber 92 through the above-mentioned gap, passes from the valve chamber 92 to the passages 101 and 100 in the valve body 93, and further to the communication passage 99. To the exit line 102.

[0004]

[Problems to be solved by the device]

 By the way, the above-mentioned conventional valve device has the following problems. That is, the inlet check valve 75 closes the opening of the low pressure passage 71 by pressing the valve body 80 against the convex portion 74 by the leaf spring 81 attached to the main body convex portion 74 via the spacer 82 by the screw member 83. Therefore, the pressing position of the valve body 80 is displaced, or in an extreme case, the valve body 80 is disengaged from the leaf spring 81, causing high pressure fluid to flow into the low pressure passage, and the head of the screw member 83. There is a problem that high-pressure fluid enters from between the portion and the leaf spring 81 to concentrate stress on the screw portion, causing metal fatigue in the screw portion. Further, the outlet check valve 77 holds the valve seat 90 between the outlet housing 91 and the main body 73, and simply by the abutment between the valve seat 90 and the main body 73 or between the valve seat 90 and the outlet housing 91, the space between them is increased. Since the fluid is prevented from leaking from the valve, the fluid is not sufficiently prevented from leaking and the fluid easily leaks from between the valve seat 90 and the main body 73 or between the valve seat 90 and the outlet housing 91. There's a problem. Therefore, the purpose of the present invention is to prevent the valve element from slipping and coming off, and to provide an inlet check valve that does not have a threaded portion in the passage for high-pressure fluid and an outlet check valve that has improved fluid leakage prevention. A valve device for a reciprocating pump having a stop valve.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention introduces low-pressure fluid from the low-pressure pipe connecting portion 22 into the cylinder chamber 5 in the suction stroke of the reciprocating pump, and discharges the high-pressure fluid from the cylinder chamber 5 in the discharge stroke of the reciprocating pump. A reciprocating pump valve device for guiding a fluid to a high-pressure pipe connection portion 46, which closes an end portion of the cylinder chamber 5 and is provided on a second wall surface 7 opposite to the first wall surface 9 facing the cylinder chamber 5. A first member 1 having a first concave portion 8 and further having a first passage 10 for guiding the high-pressure fluid discharged from the cylinder chamber 5 to the first concave portion 8; The convex portion 15 that closes the first concave portion 8, the low-pressure pipe connecting portion 22, and the tip end surface 28 of the convex portion 15 are opened, and the low-pressure fluid from the low-pressure pipe connecting portion 22 is guided to the first concave portion 8. The second passage 30 and the convex portion 15 A second member 2 having a front end surface 28 and a third passage 34 opening at a third wall surface 32 opposite to the front end surface 28, and a side wall of the first recess 8 housed in the first recess 8. And a first spring 38 for slidingly opening and closing the opening of the second passage 30 and a first spring 38 for urging the first valve body 37 toward the opening. The stop valve 39 has a second recess 49 in a fourth wall surface 47 that is detachably connected to the second member 2 and faces the third wall surface 32 of the second member 2; and 4 has a high-pressure pipe connection portion 46 provided on the opposite side of the wall surface 47, and a fifth passage 50 that opens at the bottom surface of the second recess 49 described above and that guides high-pressure fluid to the high-pressure pipe connection portion 46. 3 member 3, and the second concave portion held between the third wall surface 32 and the fourth wall surface 47. A valve seat 53 having a fourth passage 60 for closing the valve 49 and guiding the high-pressure fluid sent through the third passage 34 to the second recess 49, and the second recess of the fourth passage 60. A second check valve 56 including a second valve body 54 for opening and closing the opening on the 49 side and a second spring 55 for urging the second valve body 54 toward the opening is provided. Is characterized by.

Sealing members 61, 62 are provided around the opening of the fourth passage 60 between the third wall surface 32 and the valve seat 53 and between the fourth wall surface 47 and the valve seat 53. The groove 61v, 62v having a V-shaped cross-section is formed in a circular shape at a portion of the third wall surface 32 and the fourth wall surface 47 which are in contact with the seal members 61, 62 while being arranged. It is possible to allow 62 to bite into the grooves 61v and 62v.

[0007]

[Action]

 In the above structure, in the suction stroke of the reciprocating pump, the first valve body 37 opens the opening of the second passage 30, and the low-pressure fluid from the low-pressure pipe connecting portion (22) flows into the second passage 30 and the second passage 30. The second valve body 54 closes the opening of the fourth passage 60 so that the high pressure fluid in the fifth passage 50 flows back to the fourth passage 60 while allowing the fluid to flow into the cylinder chamber 5 through the first passage 10. Prevent the. In the discharge stroke of the reciprocating pump, the first valve body 37 closes the opening of the second passage 30 and the high-pressure fluid discharged from the cylinder chamber 5 flows into the second passage 30 from the first passage 10. The second valve body 54 opens the opening of the fourth passage 60 so that the high pressure fluid flows from the fourth passage 60 to the fifth passage 50. Since the first valve body 37 is housed in the first recess 8 closed by the projection 15 of the second member 2 and is in sliding contact with the side wall of the first recess 8, the opening / closing operation causes Although it slides along the side wall of the first recessed portion 8, it does not move in the side wall direction of the first recessed portion 8 and is displaced relative to the opening of the second passage 30 or is displaced from the first recessed portion 8. It does not come off. Further, since there is no threaded portion in the high-pressure passage, metal fatigue due to stress concentration does not occur. Further, seal members 61, 62 are provided around the opening of the fourth passage 60 between the third wall surface 32 and the valve seat 53 and between the fourth wall surface 47 and the valve seat 53. At the same time, grooves 61v and 62v having a V-shaped cross section are formed in a circular shape at the portions of the third wall surface 32 and the fourth wall surface 47 which are in contact with the seal members 61 and 62, and the seal members 61 and 62 are By digging into the grooves 61v and 62v, it is possible to reliably prevent the high-pressure fluid from leaking.

[0008]

【Example】

 Hereinafter, the present invention will be described in detail with reference to illustrated embodiments. FIG. 1 (a) is a sectional view of the first embodiment of the present invention. In FIG. 1A, 1 is a sealing head as a first member, 2 is a body as a second member, and 3 is a ground nut as a third member fitted to the rear end of the body 2. .. The sealing head 1 has a protrusion 6 that is fitted into the cylinder chamber 5 of the reciprocating pump to close the end of the cylinder chamber 5, and has a first recess 8 in the rear wall surface 7 as a second wall surface. Further, it has a front end surface 9 as a first wall surface of the projecting portion 6 and a first passage 10 opened at the bottom surface of the first concave portion 8. Further, a seal member 14 is provided between the cylinder 12 and the protrusion 6 to prevent the fluid in the cylinder chamber 5 from leaking. Further, the body 2 has a convex portion 15 which closes the first concave portion 8, a flange portion 16 which is continuous with the convex portion 15, and a body portion 17 which is continuous with the flange portion 16, and the body portion 17 has an end. The cap 20 is externally fitted, and the end cap 20 is connected to the cylinder 12 by the screw portion 21 on the inner peripheral surface of the tip thereof, so that the sealing head 1 is brought into close contact with the cylinder 12 and the first cap The inclined surface of the convex portion 15 is closely attached to the inclined surface of the concave portion 8. The body 2 has a suction adapter 23 having a connection portion 22 for low-pressure piping (not shown) fitted on the body portion 17, and a C-shaped snap ring 25 for locking the suction adapter 23. In addition, there are two second passages 30 communicating with the fluid passage 26 of the suction adapter 23 and opening at the flat end face 28 of the convex portion 15, and the low pressure from the low pressure pipe is provided. The fluid is guided to the first valve chamber 31 formed between the first concave portion 8 and the convex portion 15. Further, a tip end surface 28 of the convex portion 15 and a third passage 34 for passing the high pressure fluid opened at the bottom surface of the second concave portion 33 formed on the wall surface 32 opposite to the tip end surface 28 are provided. There is.

In the first valve chamber 31, a first valve body 37 for opening and closing the opening of the second passage 30 and three first valve bodies 37 for urging the first valve body 37 toward the convex portion 15 side. A first check valve 39 consisting of one spring 38 is housed. The first valve body 37 has a flat rear end face 41 that is in sliding contact with the side wall of the first recess 8 and is in close contact with the front end face 28 of the protrusion 15, and further, a fluid from the front end face 42 to the rear end face 41. It has a passage 43. In the suction stroke of the reciprocating pump, the pressure difference between the second passage 30 and the first passage 10 overcomes the spring force of the first spring 38 and pushes the first valve body 37 forward (cylinder side), so that the second passage The opening of 30 is opened, and the low-pressure fluid from the low-pressure pipe is guided from the second passage 30 to the passage 43 of the first valve body 37 and further to the cylinder chamber 5 through the first passage 10. On the other hand, in the discharge stroke of the reciprocating pump, the spring force of the first spring 38 overcomes the pressure in the second passage 30 and presses the first valve body 37 against the convex portion 15 of the body, so that the opening portion of the second passage 30 is opened. Is closed, and the high-pressure fluid discharged from the cylinder chamber 5 flows from the first passage 10 through the passage 43 to the third passage 34, and is prevented from flowing into the second passage 30 by the first check valve 39. It The ground nut 3 has a connection part 46 for high-pressure piping (not shown) at the rear end, and has the same diameter as the second recess 33 provided in the rear end face 32 of the body 2 on the front end face 47. Has a third recess 48 and a fourth recess 49 having a diameter smaller than the above-mentioned diameter, which is opened on the bottom surface of the third recess 48, and is further opened on the bottom surface of the fourth recess 49 so that the high-pressure fluid is It has a fifth passage 50 leading to the high-pressure pipe.

Further, a second check valve 56 including a valve seat 53, a second valve body 54 and a second spring 55 is provided between the body 2 and the gland nut 3. That is, the valve seat 53 fitted in the second recess 33 of the body 2 is held by the third recess 48 of the ground nut 3, and the valve seat 53 is formed between the valve seat 53 and the fourth recess 49. The second valve chamber 58 accommodates a second valve body 54 for opening and closing the opening of the fourth passage 60 of the valve seat 53, and a spring 55 for biasing the second valve body 54 toward the opening. ing. In the second check valve 56, in the discharge stroke of the reciprocating pump, the pressure force of the fourth passage 60 overcomes the spring force of the second spring 55, and the second valve body 54 moves from the opening of the fourth passage 60. The high-pressure fluid from the fourth passage 60 flows away to the fifth passage 50, and in the suction stroke of the reciprocating pump, the second valve body 54 is pressed against the valve seat 53 by the force of the second spring 55 and the fourth valve body 54 is pressed. The opening of the passage 60 is closed to prevent the high-pressure fluid in the fifth passage 50 from flowing backward to the side of the fourth passage 60. Further, gaskets 61, 62 are provided around the opening of the fourth passage 60 between the bottom surface of the second recess 33 and the valve seat 53 and between the bottom surface of the third recess 48 and the valve seat 53. As shown in detail in FIG. 1 (b), the bottom surface of the second recess 33 is in contact with the gasket 61 and the bottom surface of the third recess is in contact with the gasket 62. Grooves 61v and 62v having a V-shaped cross section are formed circumferentially, and the above gaskets 61 and 62 bite into the V-shaped grooves 61v and 62v to achieve a more complete seal.

The valve device configured as described above operates as follows. That is, in the suction stroke of the reciprocating pump, the first check valve 39 opens the front opening of the second passage 30, and the second check valve 56 closes the rear opening of the fourth passage 60. Thus, the low-pressure fluid from the low-pressure pipe is guided to the cylinder chamber 5 through the passages 30, 43 and 10, and the fluid in the passage 50 is prevented from flowing back to the passage 60 side. On the other hand, in the discharge stroke of the reciprocating pump, the first check valve 39 closes the front opening of the second passage 30 and the second check valve 56 opens the rear opening of the fourth passage 60. The high pressure fluid discharged from the cylinder chamber 5 is guided to the high pressure pipe through the passages 10, 43, 34, 60 and 50, and the high pressure fluid discharged from the cylinder chamber 5 flows into the second passage 30. Prevent. In the suction and discharge strokes, the first valve body 37 is in the first valve chamber 31 and is in sliding contact with the side wall thereof, so that the first valve body 37 does not shift in position or come off from the first valve chamber 31. The opening of the second passage 30 can be reliably closed during the discharge stroke. Further, the seal members 61 and 62 and the V-shaped grooves 61v and 62v provided on both sides of the second valve body 53 can reliably prevent the high-pressure fluid from leaking. Further, since the seat surfaces on which the first valve body 37 and the second valve body 54 collide are the flat tip end surface 28 of the convex portion 15 and the flat surface of the valve seat 53, respectively, the seat surface is not processed or repaired. Further, since the valve bodies 37, 54, the valve seat 53 and the springs 38, 55 can be attached simply by inserting them into the recesses, maintenance and inspection are easy.

FIG. 2A is a sectional view of a second embodiment of the present invention. This valve device differs from the first embodiment in that the structure of the engaging portion between the sealing head 1 and the body 2 and the number of second passages are changed, and the first check valve is changed accordingly. The other structure is the same as that of the first embodiment. The same components are designated by the same reference numerals and the description thereof will be omitted. In the first embodiment, the inclined surface of the concave portion 8 of the sealing head 1 and the inclined surface of the convex portion 15 of the body 2 are brought into close contact with each other to prevent fluid leakage between the both, and it is troublesome to process the inclined surface. There is a drawback that it costs. Therefore, in the present embodiment, the shape of the engaging portion of both is made into a simple shape with no inclined surface, the both are connected by bolts 65, 65, .. Preventing leaks. This gasket 66, like the gaskets 61 and 62, is designed to bite into the V-shaped groove 66V provided on the sealing head 1 and the body 2 on both sides thereof, as shown in detail in FIG. 2 (b). A more reliable seal can be made. Further, in the first embodiment, the number of the second passages 30 is two, whereas in the present embodiment, the number of the second passages 30 is one, and accordingly, the first valve body Has a diameter that is slightly larger than the diameter of the opening of the second passage 30, the number of the first springs 38 is one, and the first valve chamber 31 for accommodating the first valve body is A passage 67 for connecting the cylinder chamber 5 is provided. The operation of this embodiment is the same as the operation of the first embodiment and will not be described. The feature of this embodiment as compared with the first embodiment is that, as described above, the engaging portion between the sealing head 1 and the body 2 is formed into a shape that is easy to process, and the labor of processing is omitted. ..

[0013]

As is apparent from the above, the reciprocating pump valve device of the present invention closes the end portion of the cylinder chamber, and the first wall surface on the opposite side of the first wall surface facing the cylinder chamber. A first member having a concave portion and further having a first passage for guiding the high-pressure fluid discharged from the cylinder chamber to the first concave portion; and a convex portion having a flat tip surface for closing the first concave portion A low-pressure pipe connecting portion and a second passage opened at the tip surface of the convex portion to guide the low-pressure fluid from the low-pressure pipe connecting portion to the first concave portion; a tip surface of the convex portion and its tip surface; When a first valve body for opening and closing the second passage is housed in the first recess while having a second member having a third passage opened on a third wall surface on the opposite side of Since both are in sliding contact with the side wall of the first concave portion, the position of the first valve body may be displaced, The opening of the second passage can be reliably closed without the first valve body coming off the first recess. In addition, since the passage for the high-pressure fluid has no threaded portion as in the conventional example, fatigue failure due to stress concentration does not occur. Further, the reciprocating pump valve device of the present invention is detachably connected to the second member and has a second recess on a fourth wall surface facing the third wall surface of the second member. A third member having a high-pressure pipe connection portion provided on the opposite side of the fourth wall surface and a fifth passage opening at the bottom surface of the second recess to guide the high-pressure fluid to the high-pressure pipe connection portion; A valve seat having a fourth passage that is held between a wall surface and the fourth wall surface and closes the second recess and guides high-pressure fluid sent through the third passage to the second recess. And a second valve body for opening and closing the opening of the fourth passage on the side of the second recess and a second spring for urging the second valve body toward the opening. And a valve between the third wall surface and the valve seat and between the fourth wall surface and the valve seat. A seal member is disposed around the opening of the fourth passage, and a groove having a V-shaped cross section is formed in a circular shape at a portion of the third wall surface and the fourth wall surface which is in contact with the seal member. By allowing the seal member to bite into the groove, it is possible to more reliably prevent the high-pressure fluid from leaking.

[Brief description of drawings]

FIG. 1 is a view showing a cross-section (a) of the first embodiment of the present invention and details (b) of a mounting portion of a seal member.

FIG. 2 is a view showing a cross section (a) of the second embodiment of the present invention and a detail (b) of a mounting portion of a seal member.

FIG. 3 is a sectional view of a conventional example.

[Explanation of symbols]

1 ... Sealing head, 2 ... Body, 3 ... Ground nut, 5 ... Cylinder chamber, 8 ... First recess, 10 ... First passage,
15 ... Convex part, 22 ... Low-pressure pipe connection part, 30 ... Second passage,
34 ... 3rd passage, 37 ... 1st valve body, 38 ... 1st spring, 3
9 ... 1st check valve, 46 ... High pressure piping connection part, 49 ... 2nd recessed part, 50 ... 5th passage, 53 ... Valve seat, 54 ... 2nd valve body, 5
5 ... 2nd spring, 56 ... 2nd check valve, 60 ... 4th passage, 6
1, 62, 66 ... Gasket, 61v, 62v ... V-shaped groove.

Claims (2)

[Scope of utility model registration request] 1. A low pressure fluid from a low pressure pipe connecting portion (22) is introduced into a cylinder chamber (5) in a suction stroke of a reciprocating pump,
In the discharge stroke of the reciprocating pump, the cylinder chamber (5)
A valve device for a reciprocating pump that guides high-pressure fluid discharged from a high-pressure pipe connection portion (46) to a first wall surface that closes the end of the cylinder chamber (5) and faces the cylinder chamber (5). A first recess (8) is provided on the second wall surface (7) on the side opposite to (9), and further the high pressure fluid discharged from the cylinder chamber (5) is guided to the first recess (8). aisle
A first member (1) having (10), a convex portion (15) having a flat tip surface (28) for closing the first concave portion (8), the low pressure pipe connecting portion (22), Above convex
The second passage (30) that opens at the tip surface (28) of (15) and guides the low-pressure fluid from the low-pressure pipe connection (22) to the first recess (8) and the protrusion (15). A second member (2) having a front end surface (28) and a third passage (34) opened in a third wall surface (32) opposite to the front end surface (28); and inside the first recess (8) Stored in the first recess
A first valve body (37) for slidingly contacting the side wall of (8) and opening and closing the opening of the second passage (30) and urging the first valve body (37) toward the opening side. First consisting of the first spring (38)
A check valve (39) and a fourth wall surface that is detachably connected to the second member (2) and that opposes the third wall surface (32) of the second member (2).
(47) has a second recess (49), and further has the fourth wall surface.
The high-pressure pipe connection part (46) provided on the opposite side of (47)
And a third member (3) having a fifth passageway (50) that opens at the bottom surface of the second recess (49) and guides high-pressure fluid to the high-pressure pipe connection portion (46), and the third wall surface ( 32) and the fourth wall surface (47) to close the second recess (49) and to close the third passage (3).
The high-pressure fluid sent via the second concave portion (4)
Valve seat (53) having a fourth passage (60) for leading to 9)
And a second valve body (54) for opening and closing the opening of the fourth passage (60) on the second recess (49) side, and the second valve body
A reciprocating pump valve device comprising: a second check valve (56) including a second spring (55) for urging (54) toward the opening side. 2. The valve device for a reciprocating pump according to claim 1, wherein between the third wall surface (32) and the valve seat (53) and between the fourth wall surface (47) and the valve seat (53). And a seal member (61, 6) around the opening of the fourth passage (60).
2) is provided, and the third wall surface (32) and the fourth wall surface are provided.
A groove (61v, 62v) having a V-shaped cross section is circumferentially formed at a portion of the wall surface (47) in contact with the seal member (61, 62), and the seal member (61, 62) is provided with the groove (61v, 62v). ) The valve device for a reciprocating pump, which is characterized in that