CN213145495U

CN213145495U - Filtering pressure reducing valve

Info

Publication number: CN213145495U
Application number: CN202021409874.XU
Authority: CN
Inventors: 卢国强
Original assignee: Yuhuan Xinshan Precision Machinery Co ltd
Current assignee: Yuhuan Xinshan Precision Machinery Co ltd
Priority date: 2020-07-16
Filing date: 2020-07-16
Publication date: 2021-05-07
Anticipated expiration: 2030-07-16

Abstract

The utility model discloses a filter relief pressure valve relates to valve technical field, and its technical scheme main points are: the valve body is provided with an inlet flow passage and an outlet flow passage, and a decompression core for controlling the communication between the inlet flow passage and the outlet flow passage is arranged in the valve body; the filtering piece is fixed between the inlet flow passage and the pressure reducing core, the side wall of the inlet flow passage is provided with a sewage discharge hole close to the filtering piece, and the sewage discharge piece is connected with the valve body and communicated with the sewage discharge hole. The medium in the inlet flow way flows through outlet flow way after filtering through filtering the piece, the great impurity of volume then is filtered in the inlet flow way by filtering the piece in the medium, during impurity in the clearance this relief pressure valve, close the valve of outlet flow way direction earlier, open blowdown piece again, make blowdown hole UNICOM external, medium in the inlet flow way discharges to the external world from the blowdown hole together with impurity, this blowdown in-process need not dismantle filtering piece or valve body, can realize the clearance of impurity, with this purpose that the realization convenient to use person cleared up the maintenance.

Description

Filtering pressure reducing valve

Technical Field

The utility model relates to the technical field of valves, in particular to filter relief pressure valve.

Background

The pressure reducing valve is a valve which reduces the inlet pressure to a certain required outlet pressure through regulation and leads the outlet pressure to be automatically kept stable by relying on the energy of the medium.

Currently, chinese patent publication No. CN204312804U discloses a brass filter type pressure reducing valve. Including the valve body, the valve gap, the valve clack subassembly, the valve rod, the diaphragm, diaphragm spring, adjusting bolt and shield etc, it mainly is the upper junction plate that is equipped with the disjunctor in the intake antrum of valve body and extends and seal the intake antrum, well connecting plate and lower connecting plate, and be equipped with the intercommunicating pore on well connecting plate, be equipped with the cartridge filter of location installation below the intercommunicating pore, make the medium of intake intracavity after getting into the intercommunicating pore through above-mentioned structure, can realize filtration from inside to outside by the cartridge filter, impurity in the medium all can be blockked in the cartridge filter, and only need dismantle the chock plug of cartridge filter bottom during the clearance and can take out the cartridge filter, prevent that the cartridge filter from causing impurity to scatter when the.

The technical scheme has the following defects: the applicant finds that the medium in the water inlet cavity enters the water outlet cavity after being filtered by the filter cartridge, impurities with larger diameters in the medium are intercepted in the filter cartridge by the filter cartridge, and in order to guarantee the service life of the pressure reduction system, the impurities in the filter cartridge need to be cleaned after the filter cartridge is disassembled, and the cleaning mode is not convenient for a user to clean and maintain.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide a filter relief pressure valve, it has the advantage that convenient to use person cleared up the maintenance.

The above technical purpose of the present invention can be achieved by the following technical solutions: a filter relief valve, characterized by: the filter comprises a valve body, a filter element and a pollution discharge element, wherein the valve body is provided with an inlet flow passage and an outlet flow passage, and a pressure reducing core for controlling the communication between the inlet flow passage and the outlet flow passage is arranged in the valve body; the filter piece is fixed between the inlet flow channel and the pressure reducing core, the side wall of the inlet flow channel is provided with a sewage discharge hole close to the filter piece, the sewage discharge piece is connected with the valve body and communicated with the sewage discharge hole, and the sewage discharge piece can be communicated with the sewage discharge hole after being opened.

Through the technical scheme, one side of the inlet flow passage and one side of the outlet flow passage are connected to the pipeline system through independent valves; the medium in the pipeline flows out from the outlet flow channel after being filtered by the filtering element from the inlet flow channel, and impurities with larger volume in the medium are intercepted in the inlet flow channel by the filtering element, so that the influence of the impurities in the medium on the normal work of the pressure reducing core is avoided, and the service life of the pressure reducing system is ensured; when the impurities in the pressure reducing valve need to be cleaned, the valve in the outlet flow passage direction is closed, then the pollution discharge piece is opened, so that the pollution discharge hole is communicated with the outside, and the medium in the inlet flow passage and the impurities are discharged to the outside from the pollution discharge hole, so that the pollution discharge of the pressure reducing valve is realized; the cleaning of impurity can be realized without disassembling the filtering piece or the valve body in the sewage discharge process, thereby realizing the purpose of cleaning and maintaining convenience for users.

Preferably, a positioning groove is formed in one side, close to the decompression core, of the inlet flow channel, the filter piece is provided with a fixing portion and a filtering portion, and the fixing portion is fixed in the positioning groove.

Through above-mentioned technical scheme, the constant head tank is close to decompression core one side, and filters in being fixed in the constant head tank through the fixed part for the medium homoenergetic that gets into exit flow from entry flow way is filtered by the filter house, thereby guarantees that this relief pressure valve normally works the in-process and avoids the influence of impurity in the medium.

Preferably, the diameter of the fixing part is larger than that of the inlet flow channel, and a plurality of notches are uniformly formed in the fixing part in the circumferential direction.

Through the technical scheme, the notch is arranged, so that the fixing part can be conveniently arranged in the positioning groove from the inlet flow channel after being deformed, and after the fixing part is reset in the positioning groove, the positioning groove can limit the fixing part, and the filtering piece is ensured to be difficult to separate from the positioning groove; the diameter of the fixing part is larger than that of the inlet flow passage, so that even if the filter piece falls off, the filter piece still stays in the positioning groove and can still work.

Preferably, the length between two opposite notches has a value smaller than the diameter of the inlet channel.

Through above-mentioned technical scheme, the distance between the two relative breachs is less than the diameter of entry runner for the deformation of fixed part is comparatively easy, is convenient for pack into the fixed slot with filtering piece.

Preferably, the filtering part protrudes towards one side of the inlet flow channel, the filtering part is in a truncated cone shape, and the sewage discharge hole is positioned below the filtering part.

Through above-mentioned technical scheme, the filter house is protruding to the entry runner direction for easily drop from the filter house after the impurity in the medium filters, and impurity can fall into the blowoff hole of filter house below under self action of gravity.

Preferably, the valve body is provided with an installation hole communicated with the sewage discharge hole, the valve body is also provided with a control hole communicated with the installation hole, and the central axis of the control hole is perpendicular to the central axis of the installation hole; blowdown spare includes blowdown ball core, blowdown valve rod, blowdown handle and blowdown valve cap, the blowdown ball core rotate set up in the mounting hole, the blowdown valve rod rotate set up in the control hole, just the inner of blowdown valve rod is connected with the blowdown ball core, the outer end of blowdown valve rod with the blowdown handle is connected, the upper end of blowdown valve cap with the connection can be dismantled to the valve body, just the blowdown valve cap will the blowdown ball core seals up to deposit in the mounting hole.

Through above-mentioned technical scheme, the blowdown ball core is packed into in the mounting hole, the blowdown valve rod rotates to be connected in the control hole, and the inner and the blowdown ball core of blowdown valve rod are connected, the outer end and the blowdown handle of blowdown valve rod are connected, the blowdown valve cap can be dismantled on connection and the valve body, and deposit the blowdown ball core seal in the mounting hole, make the blowdown handle can control the blowdown valve rod and the rotation of blowdown ball core, realize opening and close of blowdown spare, the back is opened to the blowdown spare, the blowdown hole communicates with the external world, the impurity that collects in the blowdown alright discharge to the external world.

Preferably, the lower end of the sewage valve cap is provided with a sewage joint.

Through above-mentioned technical scheme, the setting of blowdown joint, the blowdown connect alright external pipeline for the blowdown, impurity in the valve body alright directly discharge to the target area through pipeline for the blowdown, and further person of facilitating the use uses.

Preferably, the sewage draining handle is provided with a connecting section and a rotating section, and the connecting section and the sewage draining valve rod are fixed through screws.

Through the technical scheme, after the installation of blowdown ball core, blowdown valve cap, the linkage segment passes through the screw and is connected with the blowdown valve rod, under the prerequisite that does not influence the rotation section rotation, can install the blowdown handle into the angle that the user is convenient for to open and close, the blowdown handle can be perpendicular or be on a parallel with the ground installation promptly, under the unsatisfactory condition of service environment, if this relief pressure valve is close to the wall, the orientation of blowdown handle can be changed to the user to the rotation of the blowdown handle of being convenient for.

Preferably, a guide hole is formed in the valve body, the decompression core is arranged in the guide hole in a sliding manner, and a sealing baffle is arranged at the lower end of the decompression core; the valve body is internally provided with a reset hole which is coaxial with the guide hole, the reset hole is communicated with the outlet flow channel, a reset assembly is arranged in the reset hole, the reset assembly comprises a plug and a reset spring, the plug is detachably connected in the reset hole, one end of the reset spring abuts against the inner end face of the plug, and the other end of the reset spring abuts against the lower end face of the sealing baffle; the reset spring is used for applying acting force pointing to the direction of the guide hole to the sealing baffle plate, and the upper end face of the sealing baffle plate abuts against the lower side of the guide hole so as to separate the guide hole from the reset hole.

Through the technical scheme, the return spring applies acting force pointing to the direction of the guide hole to the sealing baffle plate, so that the decompression core and the sealing baffle plate slide upwards, and the inlet flow channel and the outlet flow channel are separated after the guide hole is blocked by the sealing baffle plate; the medium flows to the outlet direction after being filtered by the filtering part from the inlet flow passage, and pushes the pressure reducing core and the sealing baffle plate downwards, so that the inlet flow passage is communicated with the outlet flow passage, the filtered medium can flow out from the outlet flow passage, and the pressure of the medium is consumed through the matching of the sealing baffle plate and the return spring, so that the pressure reduction of the medium is realized.

Preferably, an avoiding hole communicated with the guide hole is formed in the outer side of the valve body, and an adjusting hole communicated with the avoiding hole is formed in the outlet runner; still be provided with adjusting part on the valve body, adjusting part includes adjusting spring, diaphragm and valve gap, adjusting spring's lower extreme is fixed with fixed block one, adjusting spring's upper end is fixed with fixed block two, the diaphragm will dodge the hole and cover, the valve gap with the valve body can be dismantled fixedly and will the diaphragm is fixed in on the valve body, the valve gap has the regulation chamber, adjusting spring coaxial set up in adjust the intracavity, the upper end of decompression core runs through the diaphragm and with fixed block one is connected.

Through the technical scheme, when the pressure in the outlet flow channel is greater than the pressure in the inlet flow channel, the pressure in the outlet flow channel acts on the diaphragm through the adjusting hole and the avoidance hole, so that the diaphragm moves upwards, meanwhile, the diaphragm drives the decompression core and the sealing baffle to move upwards, the distance between the sealing baffle and the lower end opening of the guide hole is reduced, and the flow of a medium entering the outlet flow channel through the guide hole is reduced; when the pressure in the outlet flow channel is lower than the pressure in the inlet flow channel, the diaphragm does not drive the pressure reducing core and the sealing baffle plate to move upwards any more, and the medium in the inlet flow channel impacts the sealing baffle plate to enable the sealing baffle plate and the pressure reducing core to slide downwards, the distance between the sealing baffle plate and the lower end opening of the guide hole is increased, the flow of the medium entering the outlet flow channel is increased, and therefore the flow pressure of the medium entering the outlet flow channel is in a required state; after the pressure in the outlet flow passage is balanced with the pressure in the inlet flow passage, the distance between the sealing baffle and the lower end opening of the guide hole is returned to the normal position.

To sum up, the utility model discloses the beneficial effect who contrasts in prior art does:

1. the pressure reducing valve does not need to disassemble the filter piece or the valve body in the pollution discharge process, and can be flushed without being disassembled on site;

2. the sewage draining hole is positioned below the filtering part, impurities intercepted by the filtering part can be collected into the sewage draining hole, and the impurities in the sewage draining hole can be discharged to the outside in time by opening the sewage draining piece;

3. spacing to the fixed part through the constant head tank, guarantee to filter and be difficult to break away from in the constant head tank to this filter's filter effect has been guaranteed.

Drawings

FIG. 1 is a schematic view of the embodiment in full section (with the waste discharge member omitted);

FIG. 2 is a schematic view of the full-section structure of the valve body in the embodiment;

FIG. 3 is a schematic view of the full-section structure of the embodiment;

FIG. 4 is an enlarged view of FIG. 3 at A;

FIG. 5 is a schematic external view of a filter element according to an embodiment;

FIG. 6 is a schematic diagram of a full-section structure of the embodiment, which is mainly used for showing the structures of the resetting component and the adjusting component;

fig. 7 is an external structural view of the embodiment.

Reference numerals: 100. a valve body; 110. an inlet flow passage; 111. a sewage draining hole; 112. positioning a groove; 113. a first connecting interface; 120. an outlet flow passage; 121. an adjustment hole; 122. a second connecting interface; 130. mounting holes; 131. a first gasket; 140. a control hole; 150. a guide hole; 160. a reset hole; 170. avoiding holes; 200. a filter member; 210. a fixed part; 211. a notch; 220. a filtering part; 300. a blowdown member; 310. a pollution discharge ball core; 320. a blowdown valve rod; 330. a sewage disposal handle; 331. a connecting section; 332. a rotating section; 340. a blowdown valve cap; 341. a blowdown joint; 342. a second gasket; 400. a decompression core; 410. sealing the baffle; 411. a rubber gasket; 500. a reset assembly; 510. a plug; 520. a return spring; 600. an adjustment assembly; 610. adjusting the spring; 611. a first fixed block; 612. a second fixed block; 6121. a central bore; 620. a membrane; 630. a valve cover; 631. an adjustment chamber; 632. an air pressure balancing hole; 633. adjusting the bolt; 6331. and (5) positioning the blocks.

Detailed Description

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element 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.

The present invention will be described in further detail with reference to the accompanying drawings.

A filtering and pressure reducing valve is shown in figures 1 to 7 and comprises a valve body 100, a filtering piece 200 and a pollution discharge piece 300, wherein the valve body 100 is provided with an inlet flow channel 110 and an outlet flow channel 120, a pressure reducing core 400 for controlling the communication between the inlet flow channel 110 and the outlet flow channel 120 is arranged in the valve body 100, the inlet flow channel 110 is provided with a first connecting interface 113, and the outlet flow channel 120 is provided with a second connecting interface 122; the filter member 200 is fixed between the inlet flow passage 110 and the pressure reducing core 400, the side wall of the inlet flow passage 110 is provided with a sewage discharge hole 111 close to the filter member 200, the sewage discharge member 300 is connected with the valve body 100 and communicated with the sewage discharge hole 111, and the sewage discharge member 300 can communicate the sewage discharge hole 111 with the outside after being opened.

The inlet flow channel 110 has a positioning groove 112 formed at a side thereof adjacent to the pressure reducing core 400, and the filter 200 has a fixing portion 210 and a filter portion 220, wherein the fixing portion 210 is fixed in the positioning groove 112 by welding or punching. Preferably, the diameter of the fixing portion 210 is greater than the diameter of the inlet flow channel 110, a plurality of notches 211 are uniformly formed in the fixing portion 210 along the circumferential direction, and the length between two opposite notches 211 is smaller than the diameter of the inlet flow channel 110.

More preferably, the filter part 220 protrudes toward the inlet flow channel 110, the filter part 220 has a truncated cone shape, the filter part 220 has a plurality of filter holes, and the drain hole 111 is located below the filter part 220. Alternatively, the filter part 220 may have another shape such that the filter part 220 protrudes toward the inlet flow path 110.

The valve body 100 is provided with a mounting hole 130 and a control hole 140, the mounting hole 130 and the sewage discharge hole 111 are coaxially arranged and communicated with the sewage discharge hole 111, and the central axis of the control hole 140 is perpendicular to the central axis of the mounting hole 130; the blowdown piece 300 includes blowdown ball core 310, blowdown valve stem 320, blowdown handle 330 and blowdown valve cap 340, the blowdown ball core 310 rotates and sets up in mounting hole 130, the blowdown valve stem 320 rotates and sets up in control hole 140, and the inner of blowdown valve stem 320 is pegged graft with blowdown ball core 310, the outer end and the blowdown handle 330 of blowdown valve stem 320 can be dismantled and be connected, the upper end and the valve body 100 of blowdown valve cap 340 can be dismantled and be connected, and blowdown valve cap 340 seals blowdown ball core 310 in mounting hole 130, the lower extreme of blowdown valve cap 340 has blowdown joint 341, blowdown joint 341 can be pagoda joint.

Preferably, the drain handle 330 has a connection section 331 and a rotation section 332, and the connection section 331 and the drain valve stem 320 are fixed by a screw. The first gasket 131 is arranged in the mounting hole 130, the second gasket 342 is arranged in the blowdown bonnet 340, and inner rings of the first gasket 131 and the second gasket 342 are tightly abutted against the outer wall of the blowdown ball core 310.

As another scheme, the drainage member 300 may also adopt a common valve in the prior art, so that the drainage hole 111 can be communicated with the outside after the valve is opened.

A guide hole 150 is formed in the valve body 100, the pressure reducing core 400 is slidably arranged in the guide hole 150, a sealing baffle plate 410 is arranged at the lower end of the pressure reducing core 400, and a rubber gasket 411 is arranged on the sealing baffle plate 410 to ensure the sealing performance of the sealing baffle plate 410; the valve body 100 is further provided with a reset hole 160 coaxial with the guide hole 150, the reset hole 160 is communicated with the outlet flow passage 120, and the reset hole 160 is internally provided with a reset assembly 500.

The reset assembly 500 comprises a plug 510 and a reset spring 520, the plug 510 is screwed or fixed in the reset hole 160, one end of the reset spring 520 abuts against the inner end face of the plug 510, and the other end of the reset spring 520 abuts against the lower end face of the sealing baffle 410; the return spring 520 is used to apply a force to the sealing baffle 410 in a direction toward the guide hole 150, and the upper end surface of the sealing baffle 410 abuts against the lower side of the guide hole 150, thereby isolating the guide hole 150 from the return hole 160.

An avoiding hole 170 communicated with the guide hole 150 is formed in the outer side of the valve body 100, and an adjusting hole 121 communicated with the avoiding hole 170 is formed in the outlet flow passage 120; the valve body 100 is further provided with an adjusting assembly 600, the adjusting assembly 600 comprises an adjusting spring 610, a diaphragm 620 and a valve cover 630, a first fixing block 611 is fixed at the lower end of the adjusting spring 610, a second fixing block 612 is fixed at the upper end of the adjusting spring 610, the valve cover 630 and the valve body 100 are detachably fixed through bolts and fix the diaphragm 620 on the valve body 100, the diaphragm 620 covers the avoidance hole 170, the valve cover 630 is provided with an adjusting cavity 631, the adjusting spring 610 is coaxially arranged in the adjusting cavity 631, and the upper end of the decompression core 400 penetrates through the diaphragm 620 and is connected with the first fixing block 611.

The valve cover 630 is further provided with an air pressure balancing hole 632 communicated with the adjusting cavity 631, so that the first fixing block 611 and the second fixing block 612 can be ensured to move up and down normally in the adjusting cavity 631.

An adjusting bolt 633 is arranged at one end, away from the valve body 100, of the valve cover 630, a positioning block 6331 is arranged at a rod portion of the adjusting bolt 633, a central hole 6121 is formed in the second fixing block 612, the positioning block 6331 extends into the central hole 6121 to position the second fixing block 612, the second fixing block 612 is pushed downwards in the process that the adjusting bolt 633 is screwed downwards, namely, the adjusting bolt 633 is used for adjusting the horizontal height of the second fixing block 612 in the adjusting cavity 631, and therefore the pressure of a medium in the outlet flow channel 120 is adjusted from the outside.

As other schemes, the pressure reducing valve can also adopt a common pressure reducing valve in the prior art.

The working principle of the filtering pressure reducing valve is as follows:

the pressure reducing valve is connected into a pipeline system through a first connecting interface 113 and a second connecting interface 122, and an inlet flow passage 110 and an outlet flow passage 120 are controlled by separate valves respectively; the medium in the pipeline enters the guiding hole 150 after being filtered by the filtering element 200 from the inlet flow channel 110, and then the medium pushes the rubber gasket 411 to move downwards, so that the guiding hole 150 is communicated with the resetting hole 160, and the medium enters the resetting hole 160 and finally flows out through the outlet flow channel 120;

when the pressure in the outlet flow channel 120 is greater than the pressure in the inlet flow channel 110, the pressure in the outlet flow channel 120 acts on the diaphragm 620 through the adjusting hole 121 and the avoiding hole 170, so that the diaphragm 620 moves upward, and meanwhile, the diaphragm 620 drives the decompression core 400, the sealing baffle 410 and the rubber gasket 411 to move upward, so that the distance between the rubber gasket 411 and the lower end opening of the guide hole 150 is reduced, and the flow rate of a medium entering the outlet flow channel 120 through the guide hole 150 is reduced;

when the pressure in the outlet flow channel 120 is lower than the pressure in the inlet flow channel 110, the diaphragm 620 no longer drives the decompression core 400 and the sealing baffle 410 to move upward, and the medium in the inlet flow channel 110 impacts the rubber gasket 411, so that the rubber gasket 411 and the decompression core 400 slide downward, the distance between the rubber gasket 411 and the opening at the lower end of the guide hole 150 is increased, the flow rate of the medium entering the outlet flow channel 120 is increased, and thus the flow rate pressure of the medium entering the outlet flow channel 120 is in a required state; after the pressure in the outlet flow passage 120 is balanced with the pressure in the inlet flow passage 110, the distance between the sealing baffle 410 and the lower opening of the guide hole 150 returns to the normal position; the second fixing block 612 can be pushed downwards through the adjusting bolt 633, so that the second fixing block 612, the adjusting spring 610 and the first fixing block 611 move downwards integrally, resistance to be overcome when the diaphragm 620 and the pressure reducing core 400 move upwards is changed, and the pressure of a medium in the outlet flow channel 120 is changed;

in the process, impurities with large volume in the medium are intercepted in the inlet flow passage 110 by the filter piece 200, and because the sewage discharge hole 111 is positioned below the filter piece 200 and one side of the filter part 220 opposite to the inlet flow passage 110 is convex, the impurities intercepted by the filter piece 200 fall into the sewage discharge hole 111 under the action of self gravity;

when impurities in the pressure reducing valve need to be cleaned, the valve of the pipe section of the outlet flow channel 120 is closed, then the pollution discharge piece 300 is opened, so that the pollution discharge hole 111 is communicated with the outside, the medium in the inlet flow channel 110 flows to the outside from the pollution discharge hole 111, and meanwhile, the impurities in the pollution discharge hole 111 are discharged to the outside from the pollution discharge piece 300 along with the medium, so that the pollution discharge of the pressure reducing valve is realized;

this blowdown process need not dismantle with filtering piece 200 or valve body 100, can realize the clearance of impurity, really realizes exempting from in the use to tear impurity in alright the clearance this relief pressure valve open to increase the working life of this relief pressure valve, realize the purpose that the convenient to use person cleared up the maintenance with this.

The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention, which is defined by the appended claims.

Claims

1. A filter relief valve, characterized by: the filter comprises a valve body (100), a filter element (200) and a pollution discharge element (300), wherein the valve body (100) is provided with an inlet flow channel (110) and an outlet flow channel (120), and a pressure reducing core (400) for controlling the communication between the inlet flow channel (110) and the outlet flow channel (120) is arranged in the valve body (100); filter piece (200) and be fixed in between entrance flow channel (110) and decompression core (400), the lateral wall of entrance flow channel (110) is seted up and is close to drain hole (111) of filter piece (200), drain piece (300) with valve body (100) are connected and are linked together drain hole (111), just after drain piece (300) are opened can with drain hole (111) communicate external.

2. A filter and pressure relief valve as defined in claim 1, wherein: the inlet flow channel (110) is close to one side of the pressure reducing core (400) and is provided with a positioning groove (112), the filter element (200) is provided with a fixing part (210) and a filtering part (220), and the fixing part (210) is fixed in the positioning groove (112).

3. A filter and pressure relief valve as defined in claim 2, wherein: the diameter of the fixing part (210) is larger than that of the inlet flow channel (110), and a plurality of notches (211) are uniformly formed in the circumferential direction of the fixing part (210).

4. A filter and pressure relief valve as claimed in claim 3, wherein: the length between the two opposite notches (211) is smaller than the diameter of the inlet flow channel (110).

5. A filter and pressure relief valve as defined in claim 2, wherein: the filter part (220) protrudes towards one side of the inlet flow channel (110), the filter part (220) is in a truncated cone shape, and the sewage discharge hole (111) is positioned below the filter part (220).

6. A filter-pressure reducing valve according to claim 4 or 5, wherein: the valve body (100) is provided with an installation hole (130) communicated with the sewage discharge hole (111), the valve body (100) is also provided with a control hole (140) communicated with the installation hole (130), and the central axis of the control hole (140) is vertical to the central axis of the installation hole (130); blowdown spare (300) include blowdown ball core (310), blowdown valve rod (320), blowdown handle (330) and blowdown valve cap (340), blowdown ball core (310) rotate set up in mounting hole (130), blowdown valve rod (320) rotate set up in control hole (140), just the inner of blowdown valve rod (320) is connected with blowdown ball core (310), the outer end of blowdown valve rod (320) with blowdown handle (330) is connected, the upper end of blowdown valve cap (340) with the connection can be dismantled to valve body (100), just blowdown valve cap (340) will blowdown ball core (310) seal up in mounting hole (130).

7. A filter and pressure relief valve as defined in claim 6, wherein: the lower end of the sewage draining valve cap (340) is provided with a sewage draining joint (341).

8. A filter and pressure relief valve as defined in claim 7, wherein: the sewage handle (330) is provided with a connecting section (331) and a rotating section (332), and the connecting section (331) and the sewage valve rod (320) are fixed through screws.

9. A filter and pressure relief valve as defined in claim 8, wherein: a guide hole (150) is formed in the valve body (100), the pressure reducing core (400) is arranged in the guide hole (150) in a sliding mode, and a sealing baffle plate (410) is arranged at the lower end of the pressure reducing core (400); a reset hole (160) coaxial with the guide hole (150) is further formed in the valve body (100), the reset hole (160) is communicated with the outlet flow channel (120), a reset assembly (500) is arranged in the reset hole (160), the reset assembly (500) comprises a plug (510) and a reset spring (520), the plug (510) is detachably connected in the reset hole (160), one end of the reset spring (520) abuts against the inner end face of the plug (510), and the other end of the reset spring (520) abuts against the lower end face of the sealing baffle plate (410); the return spring (520) is used for applying an acting force to the sealing baffle plate (410) to point to the direction of the guide hole (150), and the upper end face of the sealing baffle plate (410) abuts against the lower side of the guide hole (150), so that the guide hole (150) is isolated from the return hole (160).

10. A filter and pressure relief valve as defined in claim 9, wherein: an avoiding hole (170) communicated with the guide hole (150) is formed in the outer side of the valve body (100), and an adjusting hole (121) communicated with the avoiding hole (170) is formed in the outlet flow channel (120); still be provided with adjusting part (600) on valve body (100), adjusting part (600) is including adjusting spring (610), diaphragm (620) and valve gap (630), the lower extreme of adjusting spring (610) is fixed with fixed block one (611), the upper end of adjusting spring (610) is fixed with fixed block two (612), diaphragm (620) will dodge hole (170) and cover, valve gap (630) with valve body (100) can be dismantled fixed and will diaphragm (620) are fixed in on valve body (100), valve gap (630) have and adjust chamber (631), adjusting spring (610) coaxial set up in adjust chamber (631), the upper end of decompression core (400) is run through diaphragm (620) and with fixed block (611) are connected.