CN111577939B

CN111577939B - Pressure-regulating non-return unloading combined overflow valve

Info

Publication number: CN111577939B
Application number: CN202010398802.8A
Authority: CN
Inventors: 苟娥
Original assignee: Chengdu Haishen Technology Co ltd
Current assignee: Chengdu Haishen Technology Co ltd
Priority date: 2020-05-12
Filing date: 2020-05-12
Publication date: 2021-09-14
Anticipated expiration: 2040-05-12
Also published as: CN111577939A

Abstract

The invention discloses a pressure-regulating, non-return and unloading combined overflow valve which comprises a valve body, an overflow port connector and an unloading port connector, wherein the valve body is provided with a water inlet connector and a water outlet connector, a step flow passage is processed in the valve body and comprises a large-diameter end and a small-diameter end, a pressure regulating mechanism for regulating the water outlet pressure of the water outlet connector is arranged in the large-diameter end, a one-way valve is arranged at the water inlet end of the water outlet connector, a hole expanding for installing the one-way valve is processed at the water inlet end of the water outlet connector, at least one water outlet is processed on the side wall of the water outlet connector at the hole expanding position, an unloading flow passage is processed in the valve body outside the hole expanding and communicated with the unloading port connector, and an unloading mechanism is arranged on the valve body at the unloading port connector. The step flow channel is processed in the valve body, and the water inlet joint, the water outlet joint, the unloading port joint, the pressure regulating mechanism and the unloading mechanism are connected to the step flow channel, so that the pressure regulating, non-return and unloading functions of the overflow valve are added, and the overflow valve is suitable for the complex environment in the field of high-pressure experiments.

Description

Pressure-regulating non-return unloading combined overflow valve

Technical Field

The invention relates to the field of pressure testing, in particular to a pressure-regulating, non-return and unloading combined overflow valve.

Background

The overflow valve is used in a pressure conveying pipeline and used for discharging redundant pressure in the conveying pipeline so as to ensure that the pressure in the pipeline is stable. Because the overflow valve has the effect of stabilizing pipeline pressure, consequently can be used to the high-pressure experiment field, but current overflow valve can not control outlet pressure in the high-pressure experiment field, still does not have the function of non return and off-load simultaneously, causes the overflow valve to use inconveniently in the high-pressure experiment.

Disclosure of Invention

The invention aims to provide a pressure-regulating check unloading combined overflow valve which has the functions of pressure regulation, check and unloading, so that the operation of a high-pressure experiment is more convenient.

The purpose of the invention is realized by the following technical scheme:

a pressure-regulating check unloading combined overflow valve comprises a valve body, an overflow port connector and an unloading port connector, wherein the valve body is provided with a water inlet connector and a water outlet connector;

the pressure regulating mechanism comprises an overflow valve seat, a pressure regulating locking nut, a pressure regulating valve core and a pressure regulating adjusting bolt, wherein the overflow valve seat, the pressure regulating valve seat and the pressure regulating locking nut are sequentially sleeved in a large-diameter end of a step flow channel along the direction from a small-diameter end to a large-diameter end;

the water inlet end of the water outlet joint is provided with a one-way valve for preventing water flow from flowing back to the small-diameter end, the water inlet end of the water outlet joint is provided with a hole expansion for mounting the one-way valve, the side wall of the water outlet joint at the hole expansion position is provided with at least one water outlet, an unloading flow passage is arranged in the valve body outside the hole expansion and communicated with an unloading port joint, and the valve body at the unloading port joint is provided with an unloading mechanism for controlling the valve body to be opened and closed;

the unloading mechanism comprises an unloading valve seat, an unloading valve core, an unloading locking nut and an unloading adjusting bolt, the unloading locking nut and the inlet end of the unloading port joint are coaxially arranged, the unloading valve seat is installed at the inlet of the unloading port joint, the unloading valve core capable of plugging the unloading port joint is arranged between the unloading valve seat and the unloading locking nut, and the unloading adjusting bolt driving the unloading valve core to move is sleeved in the unloading locking nut.

The overflow valve seat and the relative annular end face of pressure regulating valve seat are all formed with a water inlet ring, the water inlet ring is provided with a water inlet, the inner diameter of the water inlet ring is larger than the inner diameters of the overflow valve seat and the pressure regulating valve seat, the inner diameter of the pressure regulating valve seat is larger than the inner diameter of the overflow valve seat, and the inner walls of the overflow valve seat and the relative end face of the pressure regulating valve seat are all provided with conical oblique angles.

And a flow expansion groove aligned with the water inlet joint is processed on the large-diameter end outside the water inlet ring.

The end face, close to the pressure regulating valve seat, of the pressure regulating locking nut is provided with a drainage ring with the thickness smaller than that of the pressure regulating valve seat, the drainage ring is aligned with the overflow port connector, and at least one water outlet hole is formed in the drainage ring in a processing mode.

Pressure regulating case one end processing has the spacing breach of being connected with pressure regulating adjusting bolt, and the other end is equipped with arranges the bumping post between overflow disk seat and the pressure regulating disk seat in, and bumping post and pressure regulating case integrated into one piece, the diameter of bumping post is greater than the internal diameter of pressure regulating disk seat and is less than the internal diameter of circle of intaking, and the top and the bottom of bumping post are processed respectively the oblique angle with the oblique angle adaptation of pressure regulating disk seat and overflow disk seat.

The check valve comprises a check valve seat, a check valve core and a check valve spring which are sequentially arranged along the water flow direction, the check valve seat is communicated with the small-diameter end, the check valve seat is annular, an opening-shaped oblique angle is processed at the outlet end of the check valve seat, the check valve core is movably installed in the expanding hole through the check valve spring, and a conical surface matched with the oblique angle of the check valve seat is processed on the side wall, close to the check valve seat, of the check valve core.

The one end of the one-way valve core close to the water outlet joint is processed with a blind hole, the side wall of the one-way valve core outside the blind hole is processed with an avoiding groove, an opening communicated with the blind hole is processed in the avoiding groove, a water outlet is processed on the water outlet joint outside the avoiding groove, and a flow increasing groove communicated with an unloading flow passage is processed in the valve body outside the water outlet.

And a cavity communicated with the unloading channel is reserved between the unloading valve seat and the unloading locking nut.

The outer wall of one end of the unloading valve core is provided with a limiting groove connected with an unloading adjusting bolt, the other end of the unloading valve core is provided with an oblique angle, and the opening of the unloading valve seat close to the unloading valve core is provided with an oblique angle matched with the profile of the end face of the unloading valve core.

And sealing rings for improving the sealing performance of the step runner and the unloading runner are arranged between the water outlet joint, the water inlet joint, the overflow port joint, the pressure regulating mechanism and the valve body as well as between the unloading mechanism and the valve body.

The pressure-regulating check unloading combined overflow valve provided by the invention has the beneficial effects that:

(1) the overflow valve is provided with the functions of pressure regulation, non-return and unloading by processing the step flow channel in the valve body and connecting the water inlet joint, the water outlet joint, the unloading port joint, the pressure regulating mechanism and the unloading mechanism on the step flow channel, so that the overflow valve has more functions to adapt to the complex environment in the field of high-pressure experiments;

(2) the pressure of the water flow flowing out of the water outlet joint can be adjusted by arranging the pressure adjusting device, so that the overflow valve has the functions of pressure maintaining and pressure adjusting;

(3) through setting up the unloading device, can release the pressure behind the overflow valve pressurize, removed from and increased the relief valve cost in the pressure experiment field, make the hardware equipment among the pressure experiment reduce simultaneously to make the installation of pressurize experimental facilities simpler.

Drawings

Fig. 1 is a schematic structural diagram provided in an embodiment of the present invention.

Fig. 2 is a cross-sectional view taken along line a-a of fig. 1.

Fig. 3 is a cross-sectional view taken along line B-B of fig. 1.

Fig. 4 is an internal structural view of a valve body according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a pressure regulating mechanism according to an embodiment of the present invention.

Fig. 6 is an exploded view of a pressure regulating mechanism according to an embodiment of the present invention.

Fig. 7 is a schematic structural diagram of a water outlet joint and a check valve provided in the embodiment of the present invention.

Fig. 8 is an exploded view of a water outlet joint and a check valve provided in an embodiment of the present invention.

Fig. 9 is a schematic diagram of a positional relationship between an unloading mechanism and an unloading port joint according to an embodiment of the present invention.

Fig. 10 is an exploded view of a relief mechanism provided in accordance with an embodiment of the present invention.

Reference numerals: 1. a valve body; 11. a step flow channel; 12. a large diameter end; 13. a small diameter end; 14. a flow expansion groove; 15. an unloading channel; 16. a flow increasing groove; 2. a water inlet joint; 3. a water outlet joint; 31. reaming; 32. a water outlet; 4. an overflow port joint; 5. an unloading port joint; 6. a pressure regulating mechanism; 61. an overflow valve seat; 62. a pressure regulating valve seat; 63. a water inlet ring; 64. a water inlet; 65. a pressure regulating lock nut; 66. a drainage ring; 67. a water outlet hole; 68. a pressure regulating valve core; 69. a limiting notch; 610. a bumping post; 611. a pressure regulating adjusting bolt; 612. a pressure regulating hand wheel; 7. a one-way valve; 71. a one-way valve seat; 72. a one-way valve core; 73. a check valve spring; 74. blind holes; 75. an avoidance groove; 76. a port; 8. an unloading mechanism; 81. an unloading valve seat; 82. an unloading valve core; 83. a limiting groove; 84. unloading the lock nut; 85. an unloading adjusting bolt; 86. a cavity; 87. an unloading hand wheel; 9. and (5) sealing rings.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

The terms "substantially", "essentially", and the like are intended to indicate that the relative terms are not required to be absolutely exact, but may have some deviation. For example, "substantially parallel" does not merely mean absolute parallelism, and there is generally a certain deviation because absolute parallelism is difficult to achieve in actual production and operation. Therefore, "substantially parallel" includes the case where there is a certain deviation as described above, in addition to the absolute parallel.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be connected internally or indirectly. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Examples

As shown in fig. 1 to 10, the pressure-regulating, non-return and unloading combined overflow valve provided in this embodiment includes a valve body 1, a water inlet joint 2, a water outlet joint 3, an overflow port joint 4 and an unloading port joint 5, wherein a step flow passage 11 is vertically processed in the middle of the valve body 1, a large diameter end 12 of the step flow passage 11 is disposed above a small diameter end 13, the large diameter end 12 is communicated with the water inlet joint 2 and the overflow port joint 4, the small proximal end is communicated with the water outlet joint 3, a pressure regulating mechanism 6 for controlling the pressure in the small diameter end 13 is connected in the large diameter end 12, a check valve for placing water backflow is disposed between the water outlet joint 3 and the small diameter end 13, an unloading passage 15 is further processed in the valve body 1 between the check valve and the water outlet joint 3, the unloading passage 15 is communicated with the unloading joint, an unloading mechanism 8 for controlling the opening and closing of the unloading joint is disposed on the valve body 1 at the unloading joint, and the unloading mechanism 6, the check valve and the unloading mechanism 8 are passed through the pressure regulating mechanism 6, the overflow valve has the functions of pressure regulation, non-return pressure maintaining and unloading, and can be conveniently used in the field of high-pressure experiments.

As shown in fig. 5 and 6, in order to make the relief valve have the function of adjusting pressure, the pressure adjusting mechanism 6 includes a relief valve seat 61, a pressure adjusting valve seat 62, a pressure adjusting lock nut 65, a pressure adjusting valve core 68 and a pressure adjusting bolt 611, and the relief valve seat 61, the pressure adjusting valve seat 62 and the pressure adjusting lock nut 65 are sequentially sleeved in the large-diameter end 12 of the stepped flow channel 11 along the direction from the small-diameter end 13 to the large-diameter end 12; the sections of the overflow valve seat 61 opposite to the pressure regulating valve seat 62 are respectively provided with a water inlet ring 63, the two water inlet rings 63 are respectively integrated with the overflow valve seat 61 and the pressure regulating valve seat 62, the inner wall of the step runner 11 at the outer side of the water inlet ring 63 is provided with a flow expansion groove 14 communicated with the water inlet joint 2 for increasing a passage for expanding high-pressure water, so as to increase the water flow speed and ensure that the water inlet pressure cannot be changed due to the pressure regulating mechanism 6, the water inlet ring 63 is provided with a water inlet 64 for water to flow into, the overflow valve seat 61 and the pressure regulating valve seat 62 are both annular, the overflow valve seat 61 is communicated with the small-diameter end 13 of the step runner 11, so that water can flow to the water outlet joint 3, the pressure regulating locking nut 65 extends to the water discharging ring 66 on the end surface close to the pressure regulating valve seat 62, the outer diameter size of the water discharging ring 66 is smaller than the large-diameter end 12, and the inner diameter of the water discharging ring 66 is larger than the inner diameter of the pressure regulating valve seat 62, at least one water outlet hole 67 is processed on the drainage ring 66, a step through hole on the outer side of the drainage ring 66 is communicated with the overflow port joint 4, a movable pressure regulating valve core 68 is sleeved in the overflow valve seat 61, the pressure regulating valve seat 62 and the pressure regulating locking nut 65, the diameter of the pressure regulating valve core 68 is smaller than the inner diameter of the pressure regulating valve seat 62 to ensure that water can flow to the overflow valve joint, the bottom end of the pressure regulating valve core 68 is arranged between the overflow valve seat 61 and the pressure regulating valve seat 62, a retaining column 610 is integrally formed at the bottom of the pressure regulating valve core 68, the retaining column 610 is annular and is coaxially arranged with the pressure regulating valve core 68, conical chamfers are processed on the top end side wall and the bottom end side wall of the retaining column 610, conical chamfers matched with the retaining column 610 are processed on the inner walls of the opposite end surfaces of the overflow valve seat 61 and the pressure regulating valve seat 62, the chamfer surfaces are planes and are used for improving the sealing performance of the overflow valve, a pressure regulating bolt 611 for driving the pressure regulating valve core 68 to move up and down is sleeved in the pressure regulating locking nut 65, the pressure regulating adjusting bolt 611 is in threaded connection with the pressure regulating locking nut 65, the upper end of the pressure regulating adjusting bolt 611 is provided with a pressure regulating hand wheel 612, the pressure regulating hand wheel 612 is fixed on the pressure regulating adjusting bolt 611 through the pressure regulating hand wheel 612, the stop column 610 on the pressure regulating valve core 68 can be driven to move between the overflow valve seat 61 and the pressure regulating valve seat 62 through the pressure regulating adjusting bolt 611, for adjusting the water flow pressure in the small diameter end 13, the pressure in the overflow valve can be controlled by controlling the position of the pressure regulating valve core 68, in order to improve the tightness between the pressure regulating mechanism 6 and the large diameter end 12, the outer walls of the overflow valve seat 61, the pressure regulating valve seat 62 and the pressure regulating locking nut 65 are all provided with a sealing ring 9 which is matched with the large-diameter end 12 of the step runner 11, meanwhile, a sealing ring 9 matched with the pressure regulating valve core 68 is arranged on the inner side of the pressure regulating locking nut 65, by the sealing ring 9, the high-pressure water flow can only flow through the water inlet 64 on the water inlet ring 63 and the water discharge hole on the water discharge ring 66.

As shown in fig. 7 and 8, a check valve 7 for preventing water from flowing back to the small diameter end 13 is disposed at the water inlet end of the water outlet connector 3, the check valve 7 includes a check valve seat 71, a check valve core 72 and a check valve spring 73, which are sequentially disposed along the water flow direction, a counterbore 31 for installing the check valve spring 73 and the check valve core 72 is formed at the water inlet end of the water outlet connector 3, the check valve seat 71 is communicated with the small diameter end 13, the check valve seat 71 is annular, an opening of the check valve seat 71 facing the check valve core 72 is processed with an open oblique angle, a tapered surface matched with the oblique angle of the check valve seat 71 is processed on the side wall of the check valve core 72 close to the check valve seat 71, the check valve core 72 contacts with the check valve seat 71 under the action of the check valve spring 73 to prevent the water in the water outlet connector 3 from flowing back into the step flow passage 11 to maintain the pressure of the water outlet connector 3, a blind hole 74 is processed at one end of the check valve core 72 close to the water outlet connector 3, the side wall of the one-way valve core 72 outside the blind hole 74 is provided with a plurality of avoiding grooves 75, each avoiding groove 75 is internally provided with a through hole 76 communicated with the blind hole 74, the water outlet connector 3 outside the avoiding groove 75 is provided with at least one water outlet 32, the valve body 1 outside the water outlet 32 is internally provided with a flow increasing groove 16, a sealing ring 9 is arranged between the one-way valve seat 71 and the step flow channel 11 to improve the sealing property of the one-way valve 7, the sealing ring 9 is arranged between the water outlet connector 3 and the valve body 1 to ensure the sealing property of the flow increasing groove 16 so as to ensure the pressure maintaining performance of the water outlet connector 3, an unloading flow channel connecting the flow increasing groove 16 and the unloading port connector 5 is arranged in the valve body 1, the water outlet connector is communicated with the unloading port connector 5 through the unloading flow channel, and the unloading mechanism 8 for controlling and releasing the pressure in the water outlet connector 3 is arranged on the valve body 1 at the unloading port connector 5.

As shown in fig. 9 and 10, the unloading mechanism 8 includes an unloading valve seat 81, an unloading valve core 82, an unloading lock nut 84 and an unloading adjusting bolt 85, the unloading lock nut 84 is coaxially disposed with the inlet end of the unloading port joint 5, the unloading valve seat 81 is installed at the inlet of the unloading port joint 5, the unloading valve core 82 capable of blocking the unloading port joint 5 is disposed between the unloading valve seat 81 and the unloading lock nut 84, and a tapered oblique angle is processed on the side wall of the unloading valve seat 81 opposite to the unloading valve core 82 for improving the sealing property; an unloading adjusting bolt 85 is sleeved in the unloading locking nut 84, the unloading adjusting bolt 85 is in threaded connection with the unloading locking nut 84 and is used for driving the unloading valve core 82 to move, a limiting groove 83 connected with the unloading adjusting bolt 85 is machined in one end, close to the unloading locking nut 84, of the unloading valve core 82, an unloading hand wheel 87 used for driving the unloading adjusting bolt 85 is installed in one end, far away from the unloading valve core 82, of the unloading adjusting bolt 85, the unloading hand wheel 87 is installed on the unloading adjusting bolt 85 through the unloading hand wheel 87 nut, in order to guarantee pressure in an unloading flow channel, sealing rings 9 are sleeved on the outer walls of the unloading valve seat 81 and the unloading locking nut 84, and meanwhile, a sealing ring 9 in contact with the unloading valve core 82 is further sleeved on the inner wall of the unloading locking nut 84.

The using method of the invention is as follows:

the pressure test process comprises the following steps: the invention aims to provide an overflow valve which has the functions of pressure regulation, non-return pressure maintaining and unloading and is suitable for the field of pressure testing. The internal structure of the overflow valve works as follows:

during pressure regulation: the pressure testing device is connected to the water outlet connector, the unloading valve core 82 is made to block the unloading valve seat 81 by rotating the unloading adjusting hand wheel, then the high-pressure water jet is connected from the water inlet connector 2, the high-pressure water enters the pressure adjusting device from the water inlet 64 of the water inlet ring 63, and then the pressure adjusting hand wheel 612 is used for controlling the pressure adjusting valve core 68 to move. When the pressure regulating hand wheel 612 is rotated to enable the pressure regulating valve core 68 to gradually move to the pressure regulating valve seat 62, the speed of the water flowing out of the overflow port connector 4 is gradually reduced, meanwhile, the water pressure at the water outlet connector 3 is gradually increased until the stop column 610 on the pressure regulating valve core 68 is tightly contacted with the pressure regulating valve seat 62, no water is drained in the overflow port connector 4, and the water pressure at the water outlet connector 3 is equal to the water pressure at the water inlet connector 2; when the pressure regulating hand wheel 612 is rotated to enable the pressure regulating valve core 68 to gradually move to the overflow valve seat 61, water in the overflow valve seat 61 and the pressure regulating valve seat 62 passes through the pressure regulating valve seat 62 and the water outlet on the water discharging ring 66 and is discharged from the overflow port joint 4, at the moment, the water flow at the overflow port joint 4 is gradually increased, the water pressure at the water outlet joint 3 is gradually reduced, and until the stop pillar 610 on the pressure regulating valve core 68 is tightly abutted to the overflow valve seat 61, the water flow at the water inlet joint 2 is equal to the water flow at the overflow port joint 4. The pressure change at the water outlet joint 3 can be controlled by controlling the pressure regulating valve core 68, so that the pressure change in the high-pressure experimental environment is met.

At dwell (no-return): the unloading valve core 82 and the unloading valve group are sealed by rotating the unloading hand wheel 87, then high-pressure water is sent into the pressure regulating device from the water inlet 64 of the water inlet ring 63, then the stop column 610 on the pressure regulating valve core 68 is controlled to move between the overflow valve seat 61 and the pressure regulating valve seat 62 by the pressure regulating hand wheel 612, when the pressure testing device reaches the specified pressure, the stop column 610 on the pressure regulating valve core 68 is in close contact with the overflow valve seat 61 by the pressure regulating hand wheel 612, at the moment, because the water outlet of the water outlet joint 3 is blocked, the pressure in the testing device generates a reaction force, the check valve core 72 is in close contact with the check valve seat 71, the pressure in the testing device can be prevented from returning, and at the moment, the high-pressure water passes through the gap between the pressure regulating valve seat 62 and the pressure regulating valve core 68 and the water outlet 67 on the water discharge ring 66 and then is discharged from the overflow port joint 4, so as to prevent the testing device from being pressurized again.

When unloading is carried out after pressure preservation: and (3) rotating the unloading hand wheel 87 to enable the unloading valve core 82 to leave the unloading valve seat 81, wherein at the moment, high-pressure water in the testing device passes through the blind hole 74 of the one-way valve core 72, the through hole 76 of the one-way valve core 72 and the water outlet 32 on the water outlet port to enter the flow increasing groove 16, flows to the unloading channel 15 from the flow increasing groove 16 and is finally discharged from the unloading port joint 5 to finish unloading operation.

The pressure-regulating, non-return and unloading combined overflow valve provided by the embodiment of the invention can meet the pressure-regulating experiment, the non-return experiment and the unloading experiment in a high-pressure experiment, so that the overflow valve has multiple purposes, the complex operation is reduced, the installation of redundant valves is reduced, and the high-pressure experiment device is more convenient. The invention can be used for pipeline pressure test, pressure vessel pressure test and pressure test of natural gas wells and oil wells of oil fields, and can be realized by only changing the water medium flowing into the water inlet connector 2 into the gas medium during the pressure test of the gas medium, and the other operation steps are the same as the use method.

The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any modification and replacement based on the technical solution and inventive concept provided by the present invention should be covered within the scope of the present invention. It should be noted that structures or components illustrated in the drawings are not necessarily drawn to scale, and descriptions of well-known components and processing techniques and procedures are omitted to avoid unnecessarily limiting the invention.

Claims

1. The utility model provides a pressure regulating non return off-load combination overflow valve which characterized in that: the pressure regulating valve comprises a valve body with a water inlet joint and a water outlet joint, an overflow port joint and an unloading port joint, wherein a step flow channel for connecting the water inlet joint and the water outlet joint is processed on the valve body, the step flow channel comprises a large-diameter end communicated with the water inlet joint and a small-diameter end connected with the water outlet joint, and a pressure regulating mechanism for regulating the water outlet pressure at the water outlet joint is arranged in the large-diameter end;

2. The pressure-regulating check unloading combined overflow valve according to claim 1, characterized in that: the overflow valve seat and the relative annular end face of pressure regulating valve seat are all formed with a water inlet ring, the water inlet ring is provided with a water inlet, the inner diameter of the water inlet ring is larger than the inner diameters of the overflow valve seat and the pressure regulating valve seat, the inner diameter of the pressure regulating valve seat is larger than the inner diameter of the overflow valve seat, and the inner walls of the overflow valve seat and the relative end face of the pressure regulating valve seat are all provided with conical oblique angles.

3. The pressure-regulating check unloading combined overflow valve according to claim 2, characterized in that: and a flow expansion groove aligned with the water inlet joint is processed on the large-diameter end outside the water inlet ring.

4. The pressure-regulating check unloading combined overflow valve according to claim 2, characterized in that: the end face, close to the pressure regulating valve seat, of the pressure regulating locking nut is provided with a drainage ring with the thickness smaller than that of the pressure regulating valve seat, the drainage ring is aligned with the overflow port connector, and at least one water outlet hole is formed in the drainage ring in a processing mode.

5. The pressure-regulating check unloading combined overflow valve according to claim 1, characterized in that: pressure regulating case one end processing has the spacing breach of being connected with pressure regulating adjusting bolt, and the other end is equipped with arranges the bumping post between overflow disk seat and the pressure regulating disk seat in, and bumping post and pressure regulating case integrated into one piece, the diameter of bumping post is greater than the internal diameter of pressure regulating disk seat and is less than the internal diameter of circle of intaking, and the top and the bottom of bumping post are processed respectively the oblique angle with the oblique angle adaptation of pressure regulating disk seat and overflow disk seat.

6. The pressure-regulating check unloading combined overflow valve according to claim 1, characterized in that: the check valve comprises a check valve seat, a check valve core and a check valve spring which are sequentially arranged along the water flow direction, the check valve seat is communicated with the small-diameter end, the check valve seat is annular, an opening-shaped oblique angle is processed at the outlet end of the check valve seat, the check valve core is movably installed in the expanding hole through the check valve spring, and a conical surface matched with the oblique angle of the check valve seat is processed on the side wall, close to the check valve seat, of the check valve core.

7. The pressure-regulating check unloading combined overflow valve according to claim 6, characterized in that: the one end of the one-way valve core close to the water outlet joint is processed with a blind hole, the side wall of the one-way valve core outside the blind hole is processed with an avoiding groove, an opening communicated with the blind hole is processed in the avoiding groove, a water outlet is processed on the water outlet joint outside the avoiding groove, and a flow increasing groove communicated with an unloading flow passage is processed in the valve body outside the water outlet.

8. The pressure-regulating check unloading combined overflow valve according to claim 1, characterized in that: and a cavity communicated with the unloading channel is reserved between the unloading valve seat and the unloading locking nut.

9. The pressure-regulating check unloading combined overflow valve according to claim 1, characterized in that: the outer wall of one end of the unloading valve core is provided with a limiting groove connected with an unloading adjusting bolt, the other end of the unloading valve core is provided with an oblique angle, and the opening of the unloading valve seat close to the unloading valve core is provided with an oblique angle matched with the profile of the end face of the unloading valve core.

10. The pressure-regulating check unloading combined overflow valve according to claim 1, characterized in that: and sealing rings for improving the sealing performance of the step runner and the unloading runner are arranged between the water outlet joint, the water inlet joint, the overflow port joint, the pressure regulating mechanism and the valve body as well as between the unloading mechanism and the valve body.