JPS6047479B2 - Multiple reciprocating pump - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a multiple reciprocating pump, in particular, a cylinder having a plurality of parallel cylinder chambers, in which a plunger is freely reciprocated in each seam chamber. a suction valve seat supported on the cylinder head and provided at the tip of the cylinder, the suction valve seat having a suction hole and a suction valve seat surface; and a suction valve element that abuts against the suction valve seat surface to open and close the suction hole. a suction valve device comprising;
A discharge valve device including a discharge valve seat having a discharge hole and a discharge valve seat surface, and a discharge valve body that abuts against the discharge valve seat surface to open and close the discharge hole is provided in each of the cylinder chambers. Correspondingly, each of the suction holes and the discharge hole is provided so as to communicate with each cylinder chamber, and a communicating suction passage located on the inlet side of each of the suction holes and communicating with each of the suction holes is provided in the cylinder head; A communicating discharge passage is provided on the outlet side of each of the discharge holes and communicates with each of the discharge holes via the discharge valve body, and the reciprocating movement of each of the plungers causes the suction valve body and the discharge valve body to be connected to each other. This invention relates to a multiple reciprocating pump configured to operate.

(Prior Art) Generally, this type of pump has a pressure control valve that controls the pressure of the liquid flowing through the discharge passage, and the pressure applied to the valve seat of the control valve is set to the maximum pressure of the liquid flowing through the discharge passage. The control valve is set higher than the pressure, and when a gate valve or the like provided near the outlet of a liquid feeding passage communicating with the discharge passage is blocked and the inside of the discharge passage becomes overloaded, the control valve is instantaneously activated. A control valve device called a so-called unloader valve is provided to reduce the liquid pressure in the discharge passage.

However, in conventional control valve devices, a valve seat, a pressure control valve, and a control valve are supported in a valve box, and the control valve is pressed against the valve seat by a control spring. In addition to installing a spring tube that accommodates the spring, there is also a throttle valve that instantaneously operates the control valve, making the structure complex and requiring a large number of parts. The scales have drawbacks such as complicated assembly, high cost, and increased size and weight.

(Problems to be Solved by the Invention) The present invention attempts to solve the problem in the prior art that the structure of the control valve device becomes complicated due to the number of cylinder chambers. One valve seat among each suction valve seat and each discharge valve seat in the valve device and the discharge valve device, a communicating discharge passage communicating with the discharge hole of each of the discharge valve devices, the pressure control valve 1, and the cylinder. By utilizing this, when the inside of the discharge passage becomes overloaded, the liquid in the discharge passage can be immediately unloaded, and the structure can be simplified.

(Means for Solving the Problems) Accordingly, the present invention provides a cylinder having a plurality of cylinder chambers arranged in parallel, in which a plunger is supported in each of the cylinder chambers so as to freely reciprocate, and which is provided at the tip of the cylinder. a suction valve seat having a suction hole and a suction valve seat surface in the head;
a suction valve device comprising a suction valve body that opens and closes the suction hole by abutting against the suction valve seat; a discharge valve seat having a discharge hole and a discharge valve seat; and the discharge valve seat. A discharge valve device including a discharge valve body that opens and closes the discharge hole in abutment with a surface is provided corresponding to each cylinder chamber so that each of the suction holes and the discharge hole communicates with each cylinder chamber. and located on the inlet side of each suction/hole in the cylinder head,
A communicating suction passage communicating with each of the suction holes and a communicating discharge passage located on the outlet side of each of the discharge holes and communicating with each of the discharge holes via the discharge valve body are provided so that each of the plungers can reciprocate. In the multiple reciprocating pump configured to operate each of the suction valve bodies and the discharge valve body by motion, one of the suction valve seats and the discharge valve seats,
providing a rising portion that rises in the same direction as the moving direction of the valve body that abuts against the valve seat surface of the valve seat and plunges into the communicating discharge passage;
A control valve seat surface is provided on an end surface of the upright portion, and a through hole is provided between the communicating discharge passage and the communicating suction passage in the cylinder head, and the through hole has a cylindrical shape,
An abutting surface that abuts with the control valve seat surface and a pressure receiving surface having a larger diameter than the outer diameter of the control valve seat surface are provided on the end surface, and the communicating suction passage is provided in the center part through the abutting surface. One pressure control valve provided with a communication passage that is always open on the low pressure side containing the pressure control valve is supported so as to be able to approach and separate from the control valve seat surface, and the pressure control valve is connected to the pressure control valve by a control spring having a pressure regulating body. pressing against a control valve seat surface to cause the abutting surface to abut against the control valve seat surface, closing the communication passage to the communication discharge passage, and moving the pressure control valve against the control spring; The abutment surface is separated from the control valve seat surface so that the communication discharge passage is communicated with the low pressure side via the communication passage, while the inner circumferential surface of the through hole on the side of the communication suction passage an inner cavity portion having a larger diameter than the through hole; and the pressure control valve is provided with a large diameter portion having a diameter larger than the outer diameter of the pressure receiving surface and in contact with an inner circumferential surface of the inner cavity portion. A pressure accumulation chamber is provided between the large-diameter portion and the inner cavity, and a check valve is interposed in the middle of the liquid feeding passage communicating with the outlet of the communication discharge passage, and the outlet of the check valve is A bypass passage is provided in the normal liquid feeding passage, and the bypass passage is communicated with the pressure accumulation chamber.

(Function) The reciprocating motion of the plunger operates the suction valve body of each suction valve device and the discharge valve body of each discharge valve device to discharge pressurized liquid into the communicating discharge passage, and reduce the liquid pressure in this discharge passage. While controlling with one pressure control valve, if the inside of the discharge passage becomes overloaded, a push-up blade larger than the push-up blade applied to the pressure-receiving surface is applied to the large diameter portion of the control valve, and the pressure control valve is controlled. is opened, the pressurized liquid in the discharge passage is released to the low pressure side through the communication passage, and the pressure in the discharge passage is made low.

(Example) Examples of the pump of the present invention will be described below based on the drawings.

Although the pump shown in FIGS. 1 and 2 is a three-barreled reciprocating pump, other reciprocating pumps of two-barrel type, four-barrel type or more may also be used. In FIGS. 1 and 2, 1 is a housing, 2 is an output shaft rotatably supported in the housing 1 via bearings 3, 3, and the output shaft 2 has a cylindrical cam having an eccentric shaft hole 4a. A body 4 is attached.

Further, 5 is a cylinder having three parallel cylinder chambers 5a, which is attached to the housing 1.

Further, in each cylinder chamber 5a of this cylinder 5, three plungers 7 which are attached to the cam body 4 via rods 6 are supported in a freely reciprocating manner.
A sealing member 5 is provided between the outer periphery of the cylinder chamber 5a and each cylinder chamber 5a.
1, a seal receiver 52 that supports the seal member 51, and a spring 53 that presses the seal member 51 against the seal receiver 52. Further, a cylinder head 8 is provided at the tip of the cylinder 5, and the cylinder head 8 includes a suction valve seat 21 having a suction hole 21a and a suction valve seat surface 21b, and a suction valve seat 21 having an impact on the suction valve seat surface 21b. A suction valve device 20 including a suction valve body 22 that opens and closes the suction hole 21a, a discharge valve seat 31 having a discharge hole 21a and a discharge valve seat surface 31b, and the discharge valve seat surface 31b. A discharge valve device 30 is provided with a discharge valve body 32 that opens and closes the discharge hole 31a in abutment with the cylinder chamber 5a. 5a, and in the cylinder head 8, a communicating suction passage 81 located on the inlet side of each of the suction holes 21a and communicating with each of the suction holes 21a, and a communicating suction passage 81 located on the outlet side of each of the discharge holes 31a. A communicating discharge passage 82 is provided which communicates with each of the discharge holes 31a via the discharge valve body 32. The cylinder 5 is clamped between the housing 1 and the cylinder head 8 by attaching a mounting bolt (not shown) to the housing 1.
The suction valve device 20 also includes the suction valve seat 21 having a suction hole 21a in the center, the discharge valve body 22, and the discharge valve body 22 connected to the suction valve seat surface 21b of the suction valve seat 21. The discharge valve device 30 includes the discharge valve seat 31 having a discharge hole 31a consisting of a large number of through holes, the discharge valve body 32, and the discharge valve device 30. a second spring 33 for pressing the body 32 against the discharge valve seat surface 31b of the discharge valve seat 31; The outer peripheral portion of the discharge valve seat 31 is interposed between the distal end surface of the cylinder 5 and the cylinder head 8, and the cylinder 5
At the same time, the suction valve seat surface 21b and the suction valve body 22 are positioned in the cylinder chamber 5a, and the discharge valve seat surface 31b and the discharge valve body 32 are positioned in the discharge passageway 82. Then, the suction valve body 22 is pressed against the suction valve seat surface 21b by the first spring 23, and the discharge valve body 3 is pressed against the suction valve seat surface 21b.
2 is pressed against the discharge valve seat surface 31b by the second spring 33.

Furthermore, among the three suction valve seats 21, three suction valve seats 2
1, from around the suction hole 21a to the suction valve seat surface 21.
A cylindrical portion 21c protruding in the direction opposite to b is provided. Further, through holes 83, 84, 85 are provided between the communicating suction passage 81 and the communicating discharge passage 82 of the cylinder head 8, and two of the through holes 873, 84 are provided with the two suction valve seats. Insert the free end of the cylindrical part 21c provided in 21,
The suction holes 21a of the two suction valve seats 21 are communicated with the communication suction passage 81.

Therefore, from among the three suction valve seats 21, the remaining one suction valve seat 21 is placed on the end surface opposite to the suction valve seat surface 21b and from around the suction hole 21a in the moving direction of the suction valve body 22. A rising part 24 is provided that rises in the same direction as the rising part 24, and this rising part 24 projects into the discharge passage 82, and a control valve seat surface 25 is provided on the end face of the rising part 24, while the three through holes 83, 84 , 85, the remaining one through hole 85 has a cylindrical shape, and an abutment surface 41 that abuts the control valve seat surface 25 on the end surface, and a contact surface 41 having a larger diameter than the outer diameter of the control valve seat surface 25, A pressure receiving surface 42 that receives the liquid pressure of the discharge passage 82 is provided, and a communication passage 43 that penetrates the abutment surface 41 and is always open to the low pressure side including the suction passage 81 is provided in the center. The valve 40 is supported so as to be movable toward and away from the control valve seat surface 25, and the pressure control valve 40 is pressed against the control valve seat surface 25 by the control spring 9, and the abutment surface 41
is brought into contact with the control valve seat surface 25 to close the communication passage 43 to the communication discharge passage 82, and the pressure control valve 4
0 by the movement of said control spring 9 against said abutment surface 4
1 away from the control valve seat surface 25 to connect the communication discharge passage 82 to the suction passage 81 via the communication passage 43.
At the same time, a bore portion 86 having a larger diameter than the through hole 85 is provided on the inner circumferential surface of the through hole 85 on the side of the communicating suction passage 81, and the pressure control valve 40 has A large-diameter portion 44 having a diameter larger than the outer diameter of the lumen portion 86 and in contact with the inner circumferential surface of the lumen portion 86 is provided, and a pressure accumulation chamber 87 is provided between the large-diameter portion 44 and the lumen portion 86; In addition, a check valve 11 is installed in the middle of the liquid feeding passage 10 that communicates with the outlet of the communication discharge passage 82. A bypass passage 12 is provided in the liquid feeding passage 10 on the outlet side of the check valve 11 to prevent the pressurized liquid from flowing back into the discharge passage 82. 87.

The control valve 40 is formed into a cylindrical shape with a bottom that is larger than the outer diameter of the control valve seat surface 25 of the suction valve seat 21, and the abutment surface 41 and the pressure receiving surface 42 are formed on the outer circumference of the bottom surface. At the same time, a through hole is provided in the center of the bottom surface, and the through hole is used as the communication path T43, and the annular large diameter portion 44 extending radially outward is provided in the middle of the cylindrical portion. It is.

Further, a pressure regulating body 13 is movably attached to the cylinder head 8, and a spring retainer 14 having a liquid introduction hole 14a is interposed between the regulating body 13 and the control spring 9. By operating the body 13, the control spring 9 is elastically deformed to adjust the pressing force of the control valve 40 against the control valve seat surface 25, and to control the liquid pressure applied to the pressure receiving surface 42 of the pressure control valve 40. The liquid pressure in the discharge passage 82 is set.

When the plunger 77 reciprocates due to the rotation of the output shaft 2, the discharge valve body 32 closes and the suction valve body 22 opens during the reciprocating movement, and the liquid stored in the tank or the like is transferred to the communication suction passage 81. from the inlet of the suction passage 81. Liquid introduction hole 14a, center passage of control spring 9, communication passage 43
and is sucked into the cylinder chamber 5a through the suction hole 21)a,
Further, when the plunger 7 moves forward, the suction valve body 22 closes and the discharge valve body 32 opens, so that the liquid in the cylinder chamber 5a is pressurized and discharged into the communication discharge passage 82.

The liquid discharged into the discharge passage 82 is controlled to a pressure set by the pressure of the control valve 40 against the control valve seat surface 25, and is discharged from the outlet of the communication discharge passage 82 into the liquid feeding passage 10. It is. Further, when the gate valve 15 provided near the outlet of the liquid feeding passage 10 is closed, the communication discharge passage 82, the liquid feeding passage 10, and the pressure accumulation chamber 87 become high pressure, and the diameter of the pressure control valve 40 increases. A push-up blade larger than the push-up blade acting on the pressure-receiving surface 42 acts on the portion 44, and the control valve 40 is momentarily opened by the push-up blade acting on the large diameter portion 44, so that the communicating discharge passage 82 becomes a communicating passage. 43 and a communicating suction passage 81, and the pressurized liquid in the discharge passage 82 is at a low pressure. Further, the liquid in the pressure accumulating chamber 87 is accumulated and has a high pressure due to the check valve 11 and the closure of the gate valve 15, etc., and the control valve 40 is maintained in the open state. While the control valve 40 is open, the liquid in the discharge passage 82 is at a low pressure. Next, when the gate valve 15 and the like are opened, the liquid pressure in the pressure accumulation chamber 87 decreases, the control valve 40 is pressed by the control spring 9 and closed, and the liquid is discharged from the cylinder chamber 5a to the communication discharge passage 82. The liquid becomes high pressure and is forced into the liquid sending passage 10. In addition, in the above embodiment, each discharge valve seat 31 in the discharge valve device 30 is replaced with the suction valve seat 2 in the suction valve device 20.
1, and among these suction valve seats 21, one of the suction valve seats 21 has a control valve seat surface 2 that abuts against the control valve 40.
In addition, each suction valve seat 21 and each discharge valve seat 31 may be formed separately, and one of the suction valve seats 21 and each discharge valve seat 31 may be . The valve seat 21 may be provided with a control valve seat surface 25 that abuts the control valve 40, or one discharge valve seat 31 may be provided with the control valve seat surface 25 that abuts the control valve 40. It may be provided. When the control valve seat surface 25 is provided on one of the suction valve seats 21 in the suction valve device 20 that receives only the suction valve body 22, for example, as shown in FIG.
1, the discharge passage 82, and the one through hole 85, a suction valve device 20 and a discharge valve device 30 are provided in parallel in a direction perpendicular to the center of the plunger 7. , the suction valve device 20 is arranged in front of the plunger 7 in the reciprocating direction, and the discharge valve device 3 is disposed in front of the plunger 7 in the reciprocating direction.
0 is disposed at a position displaced radially outward with respect to the center of the plunger 7, and a bypass is provided in the cylinder 5 that opens from the cylinder chamber 5a to the inlet side of the discharge hole 31a in the discharge valve device 30. one suction valve seat 2 in the suction valve device 20;
1, it enters the discharge passage 82 and has a control valve seat surface 2 on the end surface.
5, and the control valve 40 having the abutting surface 41, the pressure receiving surface 42, and the communication passage 43 is provided in the one through hole 85 in close proximity to the control valve seat surface 25. The control valve 40 is supported so as to be releasable, and the control valve 40 is pressed against the control valve seat surface 25 by the control spring 9 to open the communication path 4.
3 is closed to the discharge passage 82, and the control valve 40 is closed to the discharge passage 82.
The said control of said discharge passage 8 by movement against the spring 9
2 is configured to communicate with the suction passage 81 via the communication passage 43, and the through hole 85 is provided with the inner cavity 8.
6, and the control valve 40 is provided with the large diameter portion 44,
The pressure accumulation chamber 87 is located between the large diameter portion 44 and the inner cavity 86.
We will set up the following.

Incidentally, in the case of this embodiment, the basic structure and operation are the same as those of the embodiment shown in FIG. 1, so the details will be omitted. The control valve seat surface 25 is connected to the discharge valve body 32.
Discharge valve seat 31 in discharge valve device 30 that receives only
For example, as shown in FIG.
0 and a discharge valve device 30 are provided in parallel in a direction perpendicular to the center of the plunger 7, and the discharge valve device 30 is arranged in front of the plunger 7 in the reciprocating direction, and the suction valve device 20 is disposed at a position displaced radially outward with respect to the center of the plunger 7, and the suction valve device 20 is inserted into the cylinder 5 from the cylinder chamber 5a.
A bypass passage 5 that opens on the outlet side of the suction hole 21a in
5, and one discharge valve seat 31 in the discharge valve device 30 is provided with the rising portion 24 that protrudes into the discharge passage 82 and has a control valve seat surface 25 on the end surface,
The one through hole 85 has the abutting surface 41 and the pressure receiving surface 42.
The control valve 40 having a communication passage 43 is supported so as to be movable toward and away from the control valve seat surface 25, and the control valve 40 is pressed against the control valve seat surface 25 by the control spring 9 to close and separate the control valve 40 from the control valve seat surface 25. the passage 43 is closed to the discharge passage 82, and movement of the control valve 40 against the control spring 9 causes the discharge passage 82 to communicate with the suction passage 81 via the communication passage 43; The through hole 85 is provided with the inner cavity 86 and the control valve 40 is provided with the large diameter portion 44.
The pressure accumulating chamber 87 is provided between the large diameter portion 44 and the inner cavity portion 86.

Incidentally, in the case of this embodiment, the basic structure and operation are the same as those of the embodiment shown in FIG. 1, so the details will be omitted. Also, in the figure, 16 is a spring holder, 17 is a kite tube, and 18 is a lock nut.

As described above, the present invention includes a cylinder having a plurality of parallel cylinder chambers, in which a plunger is freely supported in the cylinder chambers, and a cylinder head provided at seven ends of the cylinder has a suction hole and a suction valve seat. A suction valve device includes a suction valve seat having a surface, a suction valve body that abuts against the suction valve seat surface to open and close the suction hole, and a discharge hole and a discharge valve seat surface. A discharge valve device including a discharge valve seat and a discharge valve body that abuts against the discharge valve seat surface and opens and closes the discharge hole is provided in correspondence with each of the cylinder chambers, respectively, and A hole is provided so as to communicate with each cylinder chamber, and a hole is located in the cylinder head on the inlet side of each suction hole,
A communicating suction passage communicating with each of the suction holes and a communicating discharge passage located on the outlet side of each of the discharge holes and communicating with each of the discharge holes via the discharge valve body are provided so that each of the plungers can reciprocate. In the multiple reciprocating pump configured to operate each of the suction valve bodies and the discharge valve body by motion, one of the suction valve seats and the discharge valve seats,
providing a rising portion that rises in the same direction as the moving direction of the valve body that abuts against the valve seat surface of the valve seat and plunges into the communicating discharge passage;
A control valve seat surface is provided on an end surface of the upright portion, and a through hole is provided between the communicating discharge passage and the communicating suction passage in the cylinder head, and the through hole has a cylindrical shape,
An abutting surface that abuts with the control valve seat surface and a pressure receiving surface having a larger diameter than the outer diameter of the control valve seat surface are provided on the end surface, and the communicating suction passage is provided in the center part through the abutting surface. One pressure control valve provided with a communication passage that is always open on the low pressure side containing the pressure control valve is supported so as to be able to approach and separate from the control valve seat surface, and the pressure control valve is connected to the pressure control valve by a control spring having a pressure regulating body. Pressing against the control valve seat surface causes the abutting surface to abut against the control valve seat surface, closing the continuous passageway to the communicating discharge passageway, and moving the pressure control valve against the control spring causes the The abutment surface is separated from the control valve seat surface so that the communicating discharge passage is communicated with the low pressure law via the communicating passage, while the inner circumferential surface of the through hole on the side of the communicating suction passage , an inner cavity portion having a larger diameter than the through hole is provided, and the pressure control valve is provided with a large diameter portion that has a diameter larger than the outer diameter of the pressure receiving surface and is in contact with an inner circumferential surface of the inner cavity portion. A pressure accumulation chamber is provided between the large-diameter portion and the inner cavity, and a check valve is interposed in the middle of a liquid feeding passage communicating with the outlet of the three communicating discharge passages, and the outlet of the check valve is Since a bypass passage is provided in the side liquid feeding passage and the bypass passage is communicated with the pressure accumulation chamber, when the inside of the discharge passage becomes overloaded, the pressure control valve is opened by the liquid pressure in the pressure accumulation chamber, and the pressure control valve is opened in the discharge passage. Not only can the liquid in the cylinder chamber be unloaded immediately, but also the valve seat dedicated to the pressure control valve and the valve box that supports this valve seat can be eliminated. It has a very simple structure with just two pressure control valves and one control spring, and can be unloaded in the event of overload.
The number of parts can be significantly reduced compared to existing ones, and the structure can be significantly simplified.

As a result, assembly is easy and
The cost can be significantly reduced, and it can be made more compact and lightweight.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIGS. 2 and 3 are cross-sectional views of only essential parts showing other embodiments. 5... Cylinder, 5a... Cylinder chamber, 7... Plunger, 20... Suction valve device, 21... Suction valve seat, 21a. ...Suction hole, 21b...Suction valve seat surface, 22...
Suction valve body, 24... Standing part, 25... Control valve seat surface, 30... Discharge valve device, 31... Discharge valve seat, 31a...・Discharge hole, 31b...
・Discharge valve seat surface, 32...Discharge valve body, 40...
...Pressure control valve, 41...Abutting surface, 42...
...Pressure receiving surface, 43...Communication path, 44...
...Large diameter part, 8...Cylinder head, 81...
...Communication suction passage, 82...Communication discharge passage, 85...Through hole, 86...Inner cavity, 87
... Pressure accumulation chamber, 10 ... Liquid feeding passage, 11
・・・・・・Check valve, 12...●●●Bypass passage.

Claims (1)

[Claims] 1. A suction valve in which a plunger is supported in each of the cylinder chambers of a cylinder having a plurality of cylinder chambers arranged in parallel, and the cylinder head provided at the tip of the cylinder has a suction hole and a suction valve seat surface. a suction valve device comprising a suction valve seat and a suction valve body that abuts against the suction valve seat surface to open and close the suction hole; a discharge valve seat having a discharge hole and a discharge valve seat surface; A discharge valve device comprising a discharge valve body that opens and closes the discharge hole by abutting against a valve seat surface, and each of the suction holes and the discharge hole communicates with each cylinder chamber in correspondence with each of the cylinder chambers. In addition, the cylinder head is provided with:
a communicating suction passage located on the inlet side of each of the suction holes and communicating with each of the suction holes; and a communicating suction passage located on the outlet side of each of the discharge holes,
A multiple reciprocating motion comprising a communicating discharge passage communicating with each of the discharge holes via the discharge valve body, and each of the suction valve bodies and the discharge valve body being actuated by the reciprocating motion of each of the plungers. In the pump, one valve seat of each of the suction valve seats and each of the discharge valve seats is provided with a valve that rises in the same direction as the moving direction of the valve body that abuts against the valve seat surface of the valve seat and connects to the communicating discharge passage. A protruding rising part is provided, a control valve seat surface is provided on the end face of the rising part, and a through hole is provided between the communicating discharge passage and the communicating suction passage in the cylinder head, and a cylinder is inserted into the through hole. a pressure-receiving surface having a larger diameter than the outer diameter of the control valve seat surface, and a pressure receiving surface having a diameter larger than the outer diameter of the control valve seat surface, and a pressure receiving surface that penetrates through the abutment surface in the center and has an abutment surface that abuts with the control valve seat surface on the end surface. One pressure control valve provided with a communication passage that is always open on the low pressure side including a communication suction passage is supported so as to be able to approach and separate from the control valve seat surface, and the pressure control valve is controlled with a pressure regulating body. A spring presses against the control valve seat surface to cause the abutment surface to abut against the control valve seat surface, thereby closing the communication passage to the communication discharge passage, and the control spring of the pressure control valve The opposing movement moves the abutment surface away from the control valve seat surface so that the communicating discharge passage communicates with the low pressure side via the communicating passage, while the communicating suction passage side of the through hole A lumen portion having a larger diameter than the through hole is provided on the inner circumferential surface, and a large diameter lumen portion is provided in the pressure control valve that has a larger diameter than the outer diameter of the pressure receiving surface and is in contact with the inner circumferential surface of the lumen portion. A pressure accumulation chamber is provided between the large-diameter portion and the inner cavity, and a check valve is interposed in the middle of the liquid feeding passage communicating with the outlet of the communication discharge passage. A multiple reciprocating pump characterized in that a bypass passage is provided in the liquid feeding passage on the outlet side of the valve, and the bypass passage is communicated with the pressure accumulation chamber.