JP2005147037A - Pressure control device and fuel supply device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a precise pressure control device of a simple structure and a fuel supply device using the same. <P>SOLUTION: When a ball 32 separates from a seat part 36, fuel at an in-flow part 34 passes through a gap between the ball 32 and the seat part 36 and is discharged from a discharge part 44. Since the discharge part 44 extends outward in a radial direction of the ball 32, force in radial direction or valve open direction acts on the ball even if an instrument restricting flow passage such as a nozzle of a jet pump is connected to the discharge part 44 and fuel pressure rises at the discharge part 44. Consequently, the ball 32 is not pressed in a direction to the seat part 36 by fuel, and the ball 34 separates from the seat part 36 when fuel pressure at the in-flow part reaches a predetermined pressure. Consequently, fuel pressure can be precisely controlled. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pressure control device that controls the pressure of a fluid and a fuel supply device using the same.

  For example, the pressure of fluid discharged from pressurizing means such as a pump always varies depending on the characteristics of the pump or the characteristics of equipment installed on the discharge side of the pump. For this reason, a pressure control device for adjusting the pressure of the fluid discharged from the pressurizing means is installed on the discharge side of the pump. For example, in the case of a fuel supply device, fuel discharged from a fuel pump is injected from an injector. Since the pressure of the fuel injected from the injector needs to be kept constant, a pressure control device is installed between the fuel pump and the injector.

  As such a pressure control device, for example, as disclosed in Patent Document 1 or Patent Document 2, a one-way pressure control device that closes a flow path by pressing a valve member in a direction opposite to a direction in which a fluid flows is provided. It is known. In the pressure control device disclosed in Patent Document 1 or Patent Document 2, when the fluid pressure exceeds a predetermined value, the valve member separates from the seat portion, and the fluid pressure is released by discharging the fluid and releasing the pressure. Is kept constant.

JP 2002-89727 A Japanese Patent Laid-Open No. 2001-227661

  In the case of the pressure control device disclosed in Patent Document 1, the fuel that has passed between the valve member and the seat portion flows to the outflow portion that faces the inflow portion with the valve member interposed therebetween. However, when the pressure increases on the downstream side of the outflow portion, the valve member is pressed against the seat portion by the pressure of the fuel on the outflow portion side together with the pressing force of the urging means. For example, many fuel supply devices including a pressure control device include a jet pump that injects surplus fuel that has passed through the pressure control device. The jet pump injects surplus fuel that has passed through the pressure control device toward the sub tank, and supplies the fuel in the fuel tank to the inside of the sub tank using the generated suction pressure. By using the jet pump, the sub tank can be filled with fuel even when the fuel level in the fuel tank is lowered. The jet pump has a nozzle that restricts the flow of fuel in order to inject high-speed fuel. Therefore, the pressure of the fuel is likely to increase at the outflow portion of the pressure control device connected to the nozzle of the jet pump. As a result, the valve member of the pressure control device is pressed to the seat portion side, and even when a predetermined valve opening pressure is reached, the valve member does not move away from the seat portion, and there is a problem that the accuracy of pressure control is reduced.

  On the other hand, in the case of the pressure control device disclosed in Patent Document 2, the flow path from the inflow portion to the outflow portion has a space for regulating pressure and a throttle. Thereby, even when the pressure of the fuel on the downstream side of the valve member increases, the pressure acting direction is the valve opening direction of the valve member and the acting area is small, so that the pressure control accuracy can be maintained. However, in the case of the pressure control device disclosed in Patent Document 2, since a space and a throttle portion are required, there is a problem that the number of parts is increased and the structure is complicated.

  Accordingly, an object of the present invention is to provide a pressure control device having a simple structure and high accuracy, and a fuel supply device using the same.

  In the first aspect of the invention, the outflow part from which the fluid that has passed between the valve member and the seat part flows out is disposed between the seat part and the guide part. Further, the fluid flows out from the outflow portion to the radially outer side of the valve member. Therefore, even if the pressure of the fluid increases on the downstream side of the outflow portion, the valve member receives force from the fluid in the radial direction and the valve opening direction. Thereby, the valve member is not pressed against the seat portion by the fluid on the side opposite to the seat portion of the valve member. Further, no space or restriction for reducing the force applied to the valve member by the pressure of the fluid is required. Therefore, the accuracy of fluid pressure control can be increased with a simple structure.

  In the invention according to claim 2, the valve member has a spherical shape. Since a slight gap is formed between the valve member and the guide portion of the body, a part of the fluid that has passed between the valve member and the seat portion flows between the valve member and the guide portion. The center of the valve member is held at a fixed position by the fluid flowing between the valve member and the guide portion. Thereby, the positional accuracy of the valve member with respect to the seat portion is improved. Therefore, the sealing degree between the valve member and the seat portion can be increased.

  In the invention according to claim 3, the end of the body opposite to the seat portion is opened across the valve member. Therefore, the fluid that has passed between the valve member and the seat portion and between the valve member and the guide portion is discharged outside the body without being stored inside the body. Thereby, the pressure rise of the fluid in the anti-seat part side of a valve member is prevented, and a valve member is not pressed against a seat part by the force added from a fluid. Accordingly, the accuracy of fluid pressure control can be increased.

  In the invention according to claim 4, the sheet member and the guide member are formed separately from the body. By forming the sheet member and the guide member separately from the body, the sheet member and the guide member can be processed separately from the body. Therefore, processing can be facilitated as compared with the case where the seat portion and the guide portion are formed on the body.

  In the invention according to claim 5, the minimum cross-sectional area of the flow path formed by the throttle means is set larger than the opening area of the gap formed between the valve member and the guide portion. Thereby, even if the pressure of the fluid increases on the throttle means side downstream of the outflow portion, the pressure on the side opposite to the seat portion of the valve member does not increase. Thereby, the valve member is not pressed against the seat portion by the fluid on the side opposite to the seat portion of the valve member. Accordingly, the accuracy of fluid pressure control can be increased.

The invention according to claim 6 includes the pressure control device according to any one of claims 1 to 4. Therefore, the fuel discharged from the fuel pump is controlled with high accuracy by the pressure control device. Therefore, the supplied fuel can be accurately controlled to a desired pressure.
The invention according to claim 7 includes a jet pump. The nozzle of the jet pump is connected to the discharge part of the pressure control device. Therefore, even when the fuel discharged from the discharge portion of the pressure control device is throttled by the nozzle and the pressure tends to increase on the downstream side of the discharge portion, the valve member is not pressed against the seat portion by the fuel. Therefore, the supplied fuel can be accurately controlled to a desired pressure.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 2 shows an example in which the pressure control device according to the first embodiment of the present invention is applied to a fuel supply device for a vehicle. The fuel supply device 10 is accommodated in a fuel tank 11 mounted on the vehicle. The fuel tank 11 has an opening (not shown), and the fuel supply device 10 is accommodated in the fuel tank 11 from the opening.

  The fuel supply device 10 includes a sub tank 12, a suction filter 13, a fuel pump 14, a fuel filter 15, a pressure control device 30, and a jet pump 16. The sub tank 12 has a bottomed cylindrical shape and is open at the top. The sub tank 12 is made of resin and has a suction port 17 on the bottom side. The sub tank 12 contains a suction filter 13, a fuel pump 14, a fuel filter 15 and a pressure control device 30. The suction filter 13 collects relatively large foreign substances contained in the fuel sucked from the inside of the sub tank 12 by the fuel pump 14.

  The fuel pump 14 has a motor (not shown) inside. An impeller, which is a rotating member (not shown), is attached to the motor, and the rotating member rotates as the motor rotates. The fuel pump 14 generates a fuel suction force by the rotation of the rotating member. The fuel pump 14 sucks the fuel that has passed through the suction filter 13 from the suction port 141 provided on the suction filter 13 side. The sucked fuel is pressurized by the rotation of the rotating member and discharged from the discharge port 142. The fuel discharged from the fuel pump 14 flows into the fuel filter 15.

  The fuel filter 15 collects relatively small foreign matters contained in the fuel discharged from the fuel pump 14. A fuel supply means 20 is connected to the fuel filter 15. The fuel supply means 20 includes an injector 21, a fuel rail 22, and a fuel passage 23. The injector 21 is mounted corresponding to each cylinder of the engine (not shown), and injects fuel into the intake air taken into the combustion chamber of the engine. The injector 21 may be configured to inject fuel into the intake air flowing through the intake passage connected to the combustion chamber of the engine, or may be configured to inject fuel into the intake air drawn into the combustion chamber of the engine. The fuel rail 22 distributes the fuel supplied from the fuel pump 14 to each injector 21. The fuel passage 23 is formed by a piping member (not shown) and connects the fuel filter 15 and the fuel rail 22. The fuel discharged from the fuel pump 14 passes through the fuel filter 15, is supplied to the injector 21 through the fuel passage 23 and the fuel rail 22, and is injected from the injector 21.

  A pressure control passage 24 branches from a fuel passage 23 connected to the discharge side of the fuel pump 14. A pressure control device 30 is connected to the end of the pressure control passage 24 on the side opposite to the fuel passage. The pressure control device 30 is installed between the pressure control passage 24 and the return passage 18, and maintains the pressure of the fuel flowing through the pressure control passage 24 and the fuel passage 23 connected to the pressure control passage 24 at a predetermined pressure. To do. The return passage 18 connects the pressure control device 30 and a nozzle 19 as a throttle means.

  The jet pump 16 includes a suction port 17 and a nozzle 19. The suction port 17 is installed near the bottom of the sub tank 12. The nozzle 19 forms a throttling in which the cross-sectional area of the flow path decreases toward the suction port 17, and injects fuel flowing through the return passage 18 toward the suction port 17. The nozzle 19 is installed facing the suction port 17. When the pressure of the fuel flowing through the fuel passage 23 rises and exceeds a predetermined pressure, excess fuel is discharged from the pressure control device 30. Excess fuel discharged from the pressure control device 30 is supplied to the nozzle 19 via the return passage 18. The fuel discharged from the pressure control device 30 passes through the nozzle 19 and is injected toward the suction port 17 at a high speed. A suction pressure is generated on the suction port 17 side by the high-speed fuel flow from the nozzle 19 toward the suction port 17. Therefore, the fuel around the suction port 17 flows into the sub tank 12. Thereby, even if the fuel level in the fuel tank 11 is lowered, the fuel in the fuel tank 11 is supplied to the sub tank 12 by the jet pump 16. As a result, the interior of the sub tank 12 is filled with fuel.

Next, the pressure control device 30 will be described in detail.
As shown in FIG. 1, the pressure control device 30 includes a body 31, a ball 32 as a valve member, and a coiled spring 33 as an urging means. The body 31 is formed in a cylindrical shape and accommodates a ball 32 and a spring 33 therein. The body 31 has an inflow portion 34 connected to the pressure control passage 24 at one end portion in the axial direction. The body 31 has a lid member 35 that holds a spring 33 at the other end in the axial direction. The lid member 35 is fixed to the inner peripheral side of the body 31 by press-fitting, for example. The body 31 has a small-diameter portion 41, a medium-diameter portion 42, and a large-diameter portion 43 having different inner diameters. A step is formed at a portion where the small diameter portion 41 and the medium diameter portion 42 are connected, and this step becomes a seat portion 36 on which the ball 32 can be seated. The small diameter portion 41 has an inner diameter smaller than the outer diameter of the ball 32. Therefore, when the ball 32 is seated on the seat portion 36, the end of the small diameter portion 41 on the counter pressure control passage side is closed.

  The medium diameter portion 42 has an inner diameter slightly larger than the outer diameter of the ball 32. Therefore, the ball 32 forms a sliding portion between the inner wall of the medium diameter portion 42. An inner wall of the medium diameter portion 42 that slides with the ball 32 serves as a guide portion 37. When the ball 32 and the medium diameter portion 42 slide in the guide portion 37, the ball 32 is guided so as to reciprocate in the axial direction of the body 31. The area of the gap formed between the ball 32 and the guide portion 37 is set sufficiently smaller than the minimum cross-sectional area of the fuel passage 191 formed in the nozzle 19 shown in FIG.

  As shown in FIG. 1, a hole portion that connects the inner wall and the outer wall is formed in the middle diameter portion 42, and this hole portion becomes the discharge portion 44. The discharge unit 44 is disposed between the sheet unit 36 and the guide unit 37. Since the discharge portion 44 is formed by a hole portion connecting the inner wall and the outer wall of the medium diameter portion 42, the discharge portion 44 extends outward in the radial direction of the ball 32. In addition, the discharge unit 44 is disposed between the sheet unit 36 and the guide unit 37. Therefore, when the ball 32 is separated from the seat portion 36, the end of the discharge portion 44 on the side opposite to the nozzle opens toward the seat portion 36 rather than the portion where the diameter of the ball 32 is maximum. Furthermore, an expansion chamber 38 is formed between the body 31 and the ball 32 by forming the seat portion 36 at the step between the small diameter portion 41 and the medium diameter portion 42. The expansion chamber 38 is formed closer to the discharge portion 44 than the sheet portion 36. The expansion chamber 38 has a larger cross-sectional area than the opening formed between the ball 32 and the seat portion 36 when the ball 32 is separated from the seat portion 36.

  The large diameter portion 43 has an inner diameter larger than the inner diameter of the medium diameter portion 42 and the outer diameter of the ball 32. An inner circumferential side of the large diameter portion 43 forms a spring chamber 45 that houses the spring 33 and the plate member 39. The plate member 39 is installed between the ball 32 and the spring 33, and transmits the pressing force of the spring 33 to the ball 32. One end of the spring 33 in the axial direction is in contact with the plate member 39, and the other end is in contact with the lid member 35. Since the lid member 35 is fixed to the body 31, the spring 33 presses the ball 32 toward the seat portion 36 via the plate member 39. The lid member 35 has a hole 351 that connects the spring chamber 45 and the sub tank 12, that is, the outside of the body 31. By installing the hole 351 in the lid member 35, the spring chamber 45 is opened to the outside of the body 31, and the fuel pressure is approximately the same between the spring chamber 45 and the inside of the sub tank 12.

  When the fuel pump 14 is activated, the fuel stored in the sub tank 12 is sucked into the fuel pump 14 via the suction filter 13. The sucked fuel is pressurized by the fuel pump 14 and discharged from the fuel pump 14. The fuel discharged from the fuel pump 14 is supplied to the injector 21 via the fuel filter 15 and the fuel passage 23, and the pressure control device 30 via the pressure control passage 24 partially branched from the fuel passage 23. Flows into the inflow portion 34 of. The ball 32 is pressed in the direction opposite to the pressing direction of the spring 33 by the fuel flowing into the inflow portion 34. That is, the ball 32 is pressed by the fuel in a direction away from the seat portion 36. When the fuel pressure in the fuel passage 23 and the pressure control passage 24 is smaller than a predetermined value, the force that the fuel in the inflow portion 34 presses the ball 32 toward the anti-seat portion is the force that the spring 33 presses the ball 32 toward the seat portion 36. Smaller than. Therefore, the ball 32 is kept seated on the seat portion 36.

  On the other hand, when the fuel pressure in the fuel passage 23 and the pressure control passage 24 becomes larger than a predetermined value, the force that the fuel in the inflow portion 34 presses the ball 32 toward the anti-seat portion causes the spring 33 to push the ball 32 toward the seat portion 36. It becomes larger than the pressing force. Therefore, the ball 32 is separated from the seat portion 36. When the ball 32 is separated from the seat portion 36, the fuel that has flowed into the inflow portion 34 passes between the ball 32 and the seat portion 36. The fuel that has passed between the ball 32 and the seat portion 36 is discharged to the return passage 18 via the discharge portion 44 that is disposed between the seat portion 36 and the guide portion 37. The fuel discharged to the return passage 18 is injected from the nozzle 19 toward the suction port 17 and is supplied again into the sub tank 12 together with the fuel present around the suction port 17. When the fuel pressure in the fuel passage 23 and the pressure control passage 24 exceeds a predetermined value, the ball 32 of the pressure control device 30 is separated from the seat portion 36, and surplus fuel is discharged from the fuel passage 23 and the pressure control passage 24 to the nozzle. 19 is discharged. As a result, the fuel pressure in the fuel passage 23 and the pressure control passage 24 decreases, and the fuel in the fuel passage 23 and the pressure control passage 24 is maintained at a predetermined pressure.

  In the first embodiment, the discharge portion 44 is disposed between the seat portion 36 and the guide portion 37 in the fuel flow direction. Therefore, by installing the nozzle 19 at the end of the discharge part 44, even when the fuel pressure in the return passage 18 and the discharge part 44 rises, radial and valve-opening forces are applied from the fuel to the ball 32. . In addition, the area of the gap formed between the ball 32 and the guide portion 37 is sufficiently smaller than the minimum cross-sectional area of the fuel passage 191 formed in the nozzle 19. Further, the spring chamber 45 is opened to the sub tank 12 outside the body 31. Therefore, even if the fuel passes between the ball 32 and the guide portion 37, the fuel pressure in the spring chamber 45 does not increase. As a result, the fuel does not press the ball 32 toward the seat portion 36, and the fuel pressure when the ball 32 is separated from the seat portion 36 is stabilized. Further, it is not necessary to form a space or form a throttle in order to reduce the influence on the ball 32 due to the fuel pressure in the return passage 18 and the discharge portion 44. Therefore, the accuracy of pressure control of the fuel supplied from the fuel pump 14 to the injector 21 can be improved with a simple structure.

  In the first embodiment, the flow of fuel between the inflow portion 34 and the discharge portion 44 is interrupted by the spherical ball 32. The movement of the ball 32 is guided by the guide portion 37 while forming a slight gap between the ball 32 and the guide portion 37. Therefore, part of the fuel that has passed between the ball 32 and the seat portion 36 flows into the spring chamber 45 via the space between the ball 32 and the guide portion 37. As a result, the center of the ball 32 is always held at a fixed position by the pressure balance of the fuel flowing around the ball 32. That is, the ball 32 is aligned by the fuel flow around the ball 32. Therefore, the concentricity between the ball 32 and the seat portion 36 is improved, and the sealing degree between the ball 32 and the seat portion 36 can be increased.

  In the first embodiment, the guide portion 37 that slides with the ball 32 is formed at a predetermined distance in the axial direction. As a result, the fuel that has passed between the ball 32 and the guide portion 37 flows into the spring chamber 45 along the guide portion 37. Therefore, the turbulence generated in the fuel flow on the side opposite to the seat portion of the ball 32 is reduced, and the irregular behavior of the ball 32 is reduced. As a result, when the ball 32 is separated from the seat portion 36, variation in the flow rate of the passing fuel is reduced. Therefore, the accuracy of pressure control of the fuel supplied from the fuel pump 14 to the injector 21 can be improved.

(Second Embodiment)
A pressure control device according to a second embodiment of the present invention is shown in FIG. The pressure control device according to the second embodiment is applied to the fuel supply device 10 as in the first embodiment. In addition, the same code | symbol is attached | subjected to the component substantially the same as 1st Embodiment, and description is abbreviate | omitted.

  As shown in FIG. 3, the pressure control device 50 according to the second embodiment includes a substantially cylindrical valve member 52 that moves in the axial direction inside a substantially cylindrical body 51. The valve member 52 is accommodated on the inner peripheral side of the body 51 together with a spring 53 as urging means. The body 51 has a small diameter portion 61 and a large diameter portion 62 having different inner diameters, and a tapered portion 63 that connects the small diameter portion 61 and the large diameter portion 62. The tapered portion 63 has a seat portion 56 on which the valve member 52 can be seated. The body 51 has a hole for connecting the inner wall and the outer wall to the large diameter portion 62. This hole is a discharge part 64. The small diameter portion 61 forms an inflow portion 54 through which fuel flows from the fuel passage 23 via the pressure control passage 24. The large diameter portion 62 of the body 51 forms a spring chamber 65 that houses the valve member 52 and the spring 53.

  The valve member 52 has a small diameter portion 521 and a large diameter portion 522 having different outer diameters. The small-diameter portion 521 has a seal portion 523 that can be seated on the seat portion 56 at the end on the side opposite to the large-diameter portion. When the seal portion 523 is seated on the seat portion 56, the space between the inflow portion 54 and the discharge portion 64 is closed. The large diameter portion 522 has an outer diameter slightly smaller than the inner diameter of the large diameter portion 62 of the body 51. Therefore, the valve member 52 forms a sliding part between the inner wall of the large diameter part 62 of the body 51. An inner wall of the large diameter portion 62 that slides with the valve member 52 serves as a guide portion 57. As a result, the valve member 52 can be seated on the seat portion 56 of the seal portion 523, and the large-diameter portion 522 is guided to move in the axial direction by sliding with the inner wall of the large-diameter portion 62 of the body 51. The

  The valve member 52 has a bottom portion 524 at an end portion on the seat portion 56 side. One end of the spring 53 housed in the spring chamber 65 is in contact with the lid member 55 installed at the end of the body 51 on the side opposite to the seat portion, and the other end is inside the valve member 52. At the bottom 524. Since the lid member 55 is fixed to the body 51 by, for example, press fitting, the spring 53 presses the valve member 52 toward the seat portion 56. When the force by which the fuel in the inflow portion 54 pushes the valve member 52 toward the anti-seat portion becomes larger than the force by which the spring 53 pushes the valve member 52 toward the seat portion 56, the valve member 52 separates from the seat portion 56, The inflow portion 54 and the discharge portion 64 are connected.

  In the second embodiment, as in the first embodiment, the pressure in the radial direction and the valve opening direction is applied to the valve member 52 by the pressure of the fuel in the discharge portion 64 and the return passage 18. Therefore, the valve member 52 is not pressed toward the seat portion 56 by the fuel pressure. Therefore, the accuracy of pressure control of the fuel supplied from the fuel pump 14 to the injector 21 can be improved with a simple structure.

(Third embodiment)
FIG. 4 shows a pressure control device according to a third embodiment of the present invention. The pressure control device according to the third embodiment is applied to the fuel supply device 10 as in the first embodiment. In addition, the same code | symbol is attached | subjected to the component substantially the same as 1st Embodiment, and description is abbreviate | omitted.

  As shown in FIG. 4, the pressure control device 70 according to the third embodiment includes a body 71 and a ball 72. The pressure control device 70 includes a sheet member 73 having a sheet portion and a guide member 74 having a guide portion. The sheet member 73 and the guide member 74 are formed separately from the body 71, and are fixed to the body 71, for example, by press fitting. By forming the sheet member 73 and the guide member 74 separately from the body 71, the sheet member 73 and the guide member 74 can be processed separately from the body 71, respectively. Therefore, compared to the case where the seat portion and the guide portion are formed on the body 71, the processing can be facilitated.

(Other embodiments)
In the plurality of embodiments described above, the example in which the pressure control device is applied to the fuel supply device has been described. However, the fluid is not limited to fuel, and liquid or gaseous fluid can be applied. The pressure control device of the present invention can be applied not only to the fuel supply device but also to a device that needs to adjust the pressure of the fluid flowing through the flow path.

  Further, the throttle means connected to the discharge section is not limited to the nozzle of the jet pump as long as the cross-sectional area of the flow path is reduced on the downstream side of the discharge section. Furthermore, although a coiled spring is illustrated as the biasing means, the biasing means is not limited to a coiled spring such as a plate spring, and various biasing can be used as long as it can apply a biasing force to the valve member. Means can be applied.

  Furthermore, in the above-described third embodiment, the example in which the sheet member and the guide member are formed separately from the body has been described. However, the sheet member and the guide member may be integrally formed, and the integral sheet member and the guide member may be installed on the body. By forming the sheet member and the guide member integrally, the coaxiality between the sheet portion and the guide portion can be easily and accurately ensured.

It is sectional drawing which shows the outline of the pressure control apparatus by 1st Embodiment of this invention. It is a schematic diagram which shows the fuel supply apparatus to which the pressure control apparatus shown in FIG. 1 is applied. It is sectional drawing which shows the outline of the pressure control apparatus by 2nd Embodiment of this invention. It is sectional drawing which shows the outline of the pressure control apparatus by 3rd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Fuel supply apparatus, 11 Fuel tank, 12 Sub tank, 14 Fuel pump, 16 Jet pump, 17 Inlet, 19 Nozzle (throttle means), 30, 50, 70 Pressure control apparatus, 31, 51, 71 Body, 32, 72 Ball (valve member), 33, 53 Spring (biasing means), 34, 54 Inflow portion, 36, 56 Seat portion, 37, 57 Guide portion, 44, 64 Discharge portion, 52 Valve member, 73 Seat member, 74 Guide Element

Claims (7)

A valve member;
A seat portion on which the valve member can be seated, a guide portion that forms a slight gap between the valve member and guides the axial movement of the valve member, an inflow portion into which fluid flows, and the seat portion and the A cylindrical body having an outflow portion that is disposed between the guide portion and the fluid flowing in from the inflow portion flows out radially outward of the valve member when the valve member is separated from the seat portion;
A biasing means that is accommodated in the body and presses the valve member toward the seat portion against a flow of fluid from the inflow portion toward the discharge portion;
A pressure control device comprising:   The pressure control device according to claim 1, wherein the valve member has a spherical shape.   3. The pressure control device according to claim 1, wherein an end portion of the body opposite to the seat portion is opened to the outside of the body with the valve member interposed therebetween.   The sheet member having the sheet portion and the guide member having the guide portion, wherein the sheet member and the guide member are formed separately from the body. The pressure control apparatus as described. The throttle means is connected to the discharge portion, and the fluid discharged from the discharge portion flows.
5. The minimum cross-sectional area of the flow path formed by the throttle means is larger than an opening area of a gap formed between the valve member and the guide portion. The pressure control apparatus as described. A fuel supply device installed inside the fuel tank,
A fuel pump that pressurizes fuel inside the fuel tank and discharges the fuel outside;
A sub tank installed inside the fuel tank and containing the fuel pump;
The pressure control device according to any one of claims 1 to 5, wherein the pressure of the fuel pressurized by the fuel pump is adjusted.
A fuel supply device comprising: A jet pump having a nozzle for injecting fuel discharged from the fuel pump, and supplying fuel from the fuel tank to the inside of the sub tank by injecting fuel from the nozzle to an inlet formed in the sub tank Further comprising
The fuel supply device according to claim 6, wherein the nozzle is connected to the outflow portion of the pressure control device.

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