CN216044691U - Water-based proportional pressure-reducing overflow valve - Google Patents

Abstract

The utility model discloses a water-based proportional pressure-reducing overflow valve, which comprises a valve body, a valve sleeve, a pressure-reducing valve core, an overflow valve core, an elastic part and an electric-mechanical conversion element, wherein the valve body is provided with a liquid supply channel, a pressure-reducing channel and an unloading channel, the valve sleeve is arranged in the valve body and is provided with a liquid supply cavity, a pressure-reducing cavity and an unloading cavity, the pressure-reducing valve core is connected with the valve body in a sliding way, the unloading cavity is divided into a first cavity and a second cavity, the first cavity is communicated with the pressure-reducing cavity, the second cavity is communicated with the unloading channel, the overflow valve core is positioned in the first cavity and is connected with the pressure-reducing valve core, the pressure-reducing valve core can drive the overflow valve core to move so as to open an overflow valve port, the elastic part presses the overflow valve core towards the direction of closing the overflow valve port, and the electric-mechanical conversion element is connected with the pressure-reducing valve core in a driving way. The water-based proportional pressure-reducing overflow valve provided by the utility model has the advantages of low processing and assembling difficulty and stable output pressure of the pressure-reducing valve port.

Description

Water-based proportional pressure-reducing overflow valve

Technical Field

The utility model relates to the technical field of proportional pressure reducing valves, in particular to a water-based proportional pressure reducing overflow valve.

Background

In the prior art, the proportional pressure reducing valve is generally an oil-based proportional pressure reducing valve. And in the oil base technique, the proportional pressure reducing valve mainly uses the slide valve structure, mostly is case integral type, and valve pocket notch cuttype structure is through carrying out rational design to relief pressure valve exit side area, carries out direct drive to the pressure reducing valve case through proportion electro-magnet, step motor etc. and control the opening of pressure reducing valve port, realizes the export decompression function. However, the slide valve structure is not suitable for water-based media, because the viscosity of water is low, the lubricating performance is poor, the slide valve is sensitive to the fit clearance, and the leakage is serious if the clearance is too large; the clearance is too small and easy to be blocked; and the processing and assembling difficulty is higher.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.

Therefore, the embodiment of the utility model provides the water-based proportional pressure-reducing overflow valve which has the advantages of low processing and assembling difficulty and stable output pressure of the pressure-reducing valve port.

The water-based proportional pressure-reducing overflow valve comprises a valve body, a valve sleeve, a pressure-reducing valve core, an overflow valve core, an elastic piece and an electro-mechanical conversion element, wherein the valve body is provided with a liquid supply channel, a pressure-reducing channel and an unloading channel; the valve sleeve is arranged in the valve body and is provided with a liquid supply cavity, a pressure reducing cavity and an unloading cavity which are sequentially arranged, the liquid supply cavity is communicated with the liquid supply channel, and the pressure reducing cavity is communicated with the pressure reducing channel; the pressure reducing valve core is connected with the valve body in a sliding way and is at least partially positioned in the liquid supply cavity and the pressure reducing cavity, and a pressure reducing valve port with adjustable opening degree is formed between the inner surface of the pressure reducing cavity and the outer surface of the pressure reducing valve core; the overflow valve core is connected with the valve body in a sliding way, an overflow valve port with adjustable opening degree is formed between the outer surface of the overflow valve core and the inner surface of the unloading cavity, the overflow valve port divides the unloading cavity into a first cavity and a second cavity, the first cavity is communicated with the decompression cavity, the second cavity is communicated with the unloading channel, the overflow valve core is positioned in the first cavity and is connected with the decompression valve core, and the decompression valve core can drive the overflow valve core to move so as to open the overflow valve port; the elastic element is positioned in the first cavity, is connected with the overflow valve core and the valve body and presses the overflow valve core towards the direction of closing the overflow valve port; the electro-mechanical conversion element is in driving connection with the pressure reducing valve core so as to balance the pressure difference between the liquid supply channel and the pressure reducing channel.

According to the water-based proportional pressure-reducing overflow valve disclosed by the embodiment of the utility model, the output quantity of the electromechanical conversion element is applied to the pressure-reducing valve core so as to control the opening degree of the pressure-reducing valve port, thereby controlling the output pressure. By connecting the overflow valve core in series with the pressure reducing valve core, when the output pressure of the pressure reducing channel is overlarge, the pressure reducing valve core drives the overflow valve core to move so as to open the overflow valve port, so that the water base flows out from the unloading channel, the pressure of the pressure reducing valve port is recovered to a set value, the pressure reducing valve core can return to a balance position again, and the output pressure of the pressure reducing valve port is ensured to be stable. And moreover, the pressure reducing function is realized by setting the pressure reducing valve port for throttling, the defects of processing difficulty and easy blockage of the damping hole caused by pressure reduction through the slender damping hole are avoided, and the processing and assembling difficulty of the water-based proportional pressure reducing overflow valve is low.

In some embodiments, the water-based proportional pressure reducing overflow valve further comprises a limiting pin connected with the pressure reducing valve core, a first end surface of the pressure reducing valve core is provided with a matching groove, at least part of the limiting pin is located in the matching groove and is spaced from the bottom surface of the matching groove, a first end of the overflow valve core is provided with a limiting flange, the limiting flange is matched in the matching groove, and the limiting flange is located between the limiting pin and the bottom surface of the matching groove.

In some embodiments, the check flange is spaced apart from the check pin when the relief valve port is in the closed state.

In some embodiments, the limit flange is provided with a spiral groove for the limit pin to be screwed in.

In some embodiments, an outer surface of the pressure relief valve spool includes a flow guiding cone surface.

In some embodiments, the outer surface of the pressure relief spool includes a stepped surface that opposes the flow direction of the water base.

In some embodiments, the electromechanical conversion element includes a proportional electromagnet and a push rod connected to a driving end of the proportional electromagnet, the water-based proportional pressure-reducing overflow valve further includes a lever, a first end of the lever is pivotally connected to the valve body, the push rod abuts against a second end of the lever, a second end of the pressure-reducing valve element abuts against a middle portion of the lever, and a second end face of the pressure-reducing valve element is a spherical surface.

In some embodiments, the valve barrel includes the confession liquid valve barrel, decompression valve barrel and the off-load valve barrel that arrange in proper order, supply the liquid chamber shaping in supply the liquid valve barrel, the decompression chamber with first cavity shaping in the decompression valve barrel, the second cavity shaping in the off-load valve barrel, supply the liquid valve barrel with decompression valve barrel interference fit, supply the liquid valve barrel with it is equipped with the decompression valve seat to press from both sides between the decompression valve barrel, the decompression valve barrel with off-load valve barrel interference fit links to each other through the screw thread spare, the decompression valve barrel with press from both sides between the off-load valve barrel and be equipped with the overflow valve seat, the on-load valve barrel is equipped with the intercommunication the decompression chamber with the drainage inclined hole of first cavity, the off-load valve barrel with valve body screw-thread fit.

In some embodiments, the pressure reducing valve sleeve includes a first valve sleeve and a second valve sleeve, the first valve sleeve and the second valve sleeve are in interference fit, the pressure reducing cavity is formed in the first valve sleeve, the first chamber is formed in the second valve sleeve, the pressure reducing valve core is provided with a first drainage hole, the overflow valve core is provided with a second drainage hole, and the pressure reducing cavity is communicated with the first chamber through the first drainage hole and the second drainage hole.

In some embodiments, the number of the valve sleeves, the pressure reducing valve core and the overflow valve core is two and corresponds to one another, the two valve sleeves are installed in the valve body, and the electro-mechanical conversion element is a double-head proportional electromagnet.

Drawings

FIG. 1 is a schematic diagram of a water-based proportional pressure relief and relief valve according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of the junction of a relief valve core and a relief valve core in a water-based proportional relief valve according to an embodiment of the utility model, wherein the relief valve port is in a closed state.

FIG. 3 is a schematic diagram of the junction of a relief valve core and a relief valve core in a water-based proportional relief valve according to an embodiment of the utility model, with the relief valve port in an open state.

Fig. 4 is another schematic diagram of a water-based proportional pressure relief and relief valve according to an embodiment of the utility model.

FIG. 5 is another schematic view of the junction of the relief valve spool and the relief valve spool in a water-based proportional relief valve according to an embodiment of the utility model, with the relief valve port in a closed state.

FIG. 6 is another schematic view of the junction of the relief valve spool and the relief valve spool in a water-based proportional relief valve according to an embodiment of the utility model, with the relief valve port in an open state.

FIG. 7 is yet another schematic diagram of a water-based proportional pressure relief and relief valve according to an embodiment of the present invention.

Reference numerals:

the pressure reducing valve comprises a valve body 1, a liquid supply channel 11, a pressure reducing channel 12, an unloading channel 13, a valve sleeve 2, a liquid supply valve sleeve 21, a liquid supply cavity 211, a pressure reducing valve sleeve 22, a first valve sleeve 221, a pressure reducing cavity 2211, a second valve sleeve 222, a first chamber 2221, a drainage inclined hole 223, an unloading valve sleeve 23, a second chamber 231, a pressure reducing valve port 24, an overflow valve port 25, a pressure reducing valve core 3, a flow guide conical surface 31, a stepped surface 32, a first drainage hole 33, a limiting pin 34, an overflow valve core 4, a second drainage hole 41, a limiting flange 42, a spiral groove 421, an elastic part 5, a spring 51, a proportional electromagnet 6, a mandril 61, a lever 7, a pressure reducing valve seat 8 and an overflow valve seat 9.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

A water-based proportional pressure relief and overflow valve according to an embodiment of the present invention is described below with reference to fig. 1 to 7.

As shown in fig. 1 to 7, the water-based proportional pressure reducing relief valve according to the embodiment of the present invention includes a valve body 1, a valve sleeve 2, a pressure reducing valve core 3, a relief valve core 4, an elastic member 5, and an electromechanical conversion element. The valve body 1 has a liquid supply passage 11, a pressure reducing passage 12, and an unloading passage 13.

The valve sleeve 2 is arranged in the valve body 1 and is provided with a liquid supply cavity 211, a pressure reduction cavity 2211 and an unloading cavity which are sequentially arranged, the liquid supply cavity 211 is communicated with the liquid supply channel 11, and the pressure reduction cavity 2211 is communicated with the pressure reduction channel 12. The pressure reducing valve core 3 is connected with the valve body 1 in a sliding way and is at least partially positioned in the liquid supply cavity 211 and the pressure reducing cavity 2211, and a pressure reducing valve port 24 with adjustable opening degree is formed between the inner surface of the pressure reducing cavity 2211 and the outer surface of the pressure reducing valve core 3.

The overflow valve core 4 is slidably connected with the valve body 1, an overflow valve port 25 with adjustable opening degree is formed between the outer surface of the overflow valve core 4 and the inner surface of the unloading cavity, the unloading cavity is divided into a first cavity 2221 and a second cavity 231 by the overflow valve port 25, the first cavity 2221 is communicated with the decompression cavity 2211, the second cavity 231 is communicated with the unloading channel 13, the overflow valve core 4 is positioned in the first cavity 2221 and is connected with the decompression valve core 3, and the decompression valve core 3 can drive the overflow valve core 4 to move so as to open the overflow valve port 25.

The elastic member 5 connects the relief valve element 4 and the valve body 1 and presses the relief valve element 4 in a direction to close the relief valve port 25. The elastic element 5 is a spring 51 and is located in the first chamber 2221, a stopper is disposed at one end of the relief valve element 4 away from the pressure reduction valve element 3, and the spring 51 is sleeved on the relief valve element 4 and clamped between the stopper and the valve sleeve 2. An electro-mechanical switching element is drivingly connected to the pressure relief valve cartridge 3 for equalizing the pressure differential between the supply passage 11 and the pressure relief passage 12.

According to the water-based proportional pressure-reducing relief valve of the embodiment of the utility model, the output pressure is controlled by applying the output quantity of the electromechanical conversion element to the pressure-reducing valve core 3 to control the opening degree of the pressure-reducing valve port 24. By connecting the overflow valve core 4 in series with the pressure reducing valve core 3, when the output pressure of the pressure reducing channel 12 is too high, the pressure reducing valve core 3 drives the overflow valve core 4 to move to open the overflow valve port 25, so that the water base flows out from the unloading channel 13, the pressure of the pressure reducing valve port 24 is restored to the set value, the pressure reducing valve core 3 can return to the balance position again, and the output pressure of the pressure reducing valve port 24 is ensured to be stable. Moreover, the pressure reducing function is realized by setting the pressure reducing valve port 24 for throttling, the defects of processing difficulty and easy blockage of a damping hole caused by pressure reduction through a slender damping hole are avoided, and the processing and assembling difficulty of the water-based proportional pressure reducing overflow valve is low.

In some embodiments, as shown in fig. 2, 3, 5 and 6, the water-based proportional pressure reducing relief valve further comprises two limiting pins 34 connected to the pressure reducing valve core 3, and the two limiting pins 34 are coaxially arranged. The first end face of the pressure reducing valve core 3 is provided with a matching groove which is a cylindrical groove. At least part of the limiting pin 34 is positioned in the matching groove and is spaced from the bottom surface of the matching groove, the first end of the overflow valve core 4 is provided with a limiting flange 42, the limiting flange 42 is matched in the matching groove, and the limiting flange 42 is positioned between the limiting pin 34 and the bottom surface of the matching groove.

Therefore, when the pressure output from the pressure reducing passage 12 is too high and the pressure reducing valve core 3 moves toward the electro-mechanical conversion element relative to the valve body 1, the limit pin 34 can stop against the limit flange 42 to drive the overflow valve core 4 to move simultaneously, so that the overflow valve port 25 is opened to realize the overflow unloading function.

In some embodiments, as shown in fig. 1, 2, 4, and 5, the stop flange 42 is spaced from the stop pin 34 when the overflow valve port 25 is in the closed state.

That is, the pressure reducing valve core 3 and the overflow valve core 4 are not rigidly connected, but the pressure reducing valve core 3 can drive the overflow valve core 4 to move after a certain stroke, so as to avoid opening the overflow valve port 25 and damaging the pressure adjustability of the pressure reducing valve port 24 when the pressure reducing valve core 3 initially moves.

In some embodiments, as shown in fig. 2 and 3, the retainer flange 42 is provided with a spiral groove 421 into which the retainer pin 34 is screwed.

That is, the non-rigid connection of the relief valve spool 3 and the relief valve spool 4 is achieved by screwing the stopper pin 34 into the spiral groove 421 to pass through the stopper flange 42, thereby fitting in the annular groove below the stopper flange 42, while the stopper pin 34 has been mounted on the first end of the relief valve spool 3.

In some embodiments, as shown in fig. 1 and 4, the outer surface of the pressure relief spool 3 includes a flow guiding cone surface 31. The water-based pressure impact can be reduced by guiding the flow through the flow guiding conical surface 31, and the steady-state characteristic of the pressure reducing valve core 3 is improved.

In some embodiments, the outer surface of pressure relief spool 3 includes a stepped surface 32, stepped surface 32 being opposite the direction of flow of the water base. The pressure reducing valve core 3 adopts a spring-free structure, realizes the balance adjustment of water-based pressure through the stepped surface 32, and adjusts the opening of the pressure reducing valve port 24 in proportion through an electric-mechanical conversion element. Therefore, the water-based proportional pressure-reducing overflow valve is simple in structure and low in processing and assembling difficulty.

In some embodiments, as shown in fig. 1, 4 and 7, the electro-mechanical conversion element includes a proportional electromagnet 6 and a push rod 61 connected to a driving end of the proportional electromagnet 6. The water-based proportional pressure-reducing overflow valve further comprises a lever 7, wherein the first end of the lever 7 is pivotally connected with the valve body 1, the ejector rod 61 stops against the second end of the lever 7, the second end of the pressure-reducing valve core 3 stops against the middle part of the lever 7, and the second end surface of the pressure-reducing valve core 3 is a spherical surface.

By arranging the lever 7, the pressure reducing valve core 3 is driven by the lever 7, and the output requirement of the proportional electromagnet 6 can be reduced. By arranging the second end surface of the pressure reducing valve core 3 as a spherical surface, the lateral force generated in the process of pushing the pressure reducing valve core 3 by the lever 7 can be reduced.

In some embodiments, as shown in fig. 1, the valve housing 2 includes a liquid supply valve housing 21, a pressure relief valve housing 22, and an unloader valve housing 23 arranged in series. The liquid supply chamber 211 is formed in the liquid supply valve housing 21, the pressure reducing chamber 2211 and the first chamber 2221 are formed in the pressure reducing valve housing 22, and the second chamber 231 is formed in the unloading valve housing 23. The liquid supply valve sleeve 21 is in interference fit with the pressure reducing valve sleeve 22, the pressure reducing valve seat 8 is arranged between the liquid supply valve sleeve 21 and the pressure reducing valve sleeve 22 in an intervening mode, the pressure reducing valve sleeve 22 is in interference fit with the unloading valve sleeve 23 and is connected with the unloading valve sleeve 23 through a threaded piece, and the overflow valve seat 9 is arranged between the pressure reducing valve sleeve 22 and the unloading valve sleeve 23 in an intervening mode. The pressure reducing valve sleeve 22 is provided with a drainage inclined hole 223 communicating the pressure reducing cavity 2211 and the first chamber 2221, and the unloading valve sleeve 23 is in threaded fit with the valve body 1.

By adopting the seat valve structure, the problem of large internal leakage or large friction due to the fit clearance can be reduced as compared with the slide valve structure. Meanwhile, the liquid supply valve sleeve 21, the pressure reducing valve sleeve 22 and the unloading valve sleeve 23 are in split insertion and thread fit, and the liquid supply valve sleeve 21, the pressure reducing valve sleeve 22, the unloading valve sleeve 23, the pressure reducing valve core 3 and the overflow valve core 4 are convenient to disassemble and assemble.

Specifically, a seal ring is assembled between each of the liquid supply valve sleeve 21, the pressure reducing valve sleeve 22 and the unloading valve sleeve 23 and the valve body 1, a seal ring is assembled between each of the liquid supply valve sleeve 21 and the pressure reducing valve sleeve 22 and the pressure reducing valve core 3, and a seal ring is assembled between the pressure reducing valve sleeve 22 and the relief valve core 4. Thereby, the sealability between the liquid supply chamber 211 and the reduced pressure chamber 2211, and the sealability between the reduced pressure chamber 2211 and the first chamber 2221 are effectively achieved.

In some embodiments, as shown in fig. 4-6, the pressure relief valve sleeve 22 includes a first valve sleeve 221 and a second valve sleeve 222. The first valve housing 221 is interference fit with the second valve housing 222, the decompression chamber 2211 is formed in the first valve housing 221, and the first chamber 2221 is formed in the second valve housing 222. The pressure reducing valve core 3 is provided with a first drainage hole 33, the overflow valve core 4 is provided with a second drainage hole 41, and the pressure reducing cavity 2211 is communicated with the first cavity 2221 through the first drainage hole 33 and the second drainage hole 41.

This eliminates the need to provide the oblique drainage holes 223 in the pressure-reducing valve sleeve 22 for drainage. In addition, by adopting the four-stage split type valve sleeve structure, compared with the three-stage split type structure in the scheme, the four-stage split type valve sleeve structure is more convenient for the connection of the pressure reducing valve core 3 and the overflow valve core 4, namely the pressure reducing valve core 3 and the overflow valve core 4 are conveniently connected by the limiting pin 34.

In some embodiments, the number of the valve sleeves 2, the pressure reducing valve core 3 and the overflow valve core 4 is two and corresponds to one another, the two valve sleeves 2 are both installed in the valve body 1, and the electro-mechanical conversion element is a double-head proportional electromagnet.

The two proportional pressure-reducing overflow valves are integrated in one valve body 1, and the double-end proportional electromagnet is adopted for driving, so that the structure is more compact, and the proportional pressure-reducing overflow valve is more suitable for narrow spaces such as coal mines.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (10)

1. A water-based proportional pressure relief and overflow valve, comprising:

the valve body is provided with a liquid supply channel, a pressure reducing channel and an unloading channel;

the valve sleeve is arranged in the valve body and is provided with a liquid supply cavity, a decompression cavity and an unloading cavity which are sequentially arranged, the liquid supply cavity is communicated with the liquid supply channel, and the decompression cavity is communicated with the decompression channel;

the pressure reducing valve core is connected with the valve body in a sliding mode and is at least partially positioned in the liquid supply cavity and the pressure reducing cavity, and a pressure reducing valve port with adjustable opening degree is formed between the inner surface of the pressure reducing cavity and the outer surface of the pressure reducing valve core;

the overflow valve core is connected with the valve body in a sliding manner, an overflow valve port with adjustable opening degree is formed between the outer surface of the overflow valve core and the inner surface of the unloading cavity, the overflow valve port divides the unloading cavity into a first cavity and a second cavity, the first cavity is communicated with the decompression cavity, the second cavity is communicated with the unloading channel, the overflow valve core is positioned in the first cavity and connected with the decompression valve core, and the decompression valve core can drive the overflow valve core to move so as to open the overflow valve port;

the elastic element is positioned in the first cavity, is connected with the overflow valve core and the valve body and presses the overflow valve core towards the direction of closing the overflow valve port; and

an electro-mechanical transducer in driving communication with the pressure relief valve cartridge to facilitate balancing a pressure differential between the supply passage and the pressure relief passage.

2. The water-based proportional pressure reducing overflow valve according to claim 1, further comprising a limit pin connected to the pressure reducing valve core, wherein a first end surface of the pressure reducing valve core is provided with a fitting groove, at least a portion of the limit pin is located in the fitting groove and is spaced apart from a bottom surface of the fitting groove, the first end of the overflow valve core is provided with a limit flange, the limit flange is fitted in the fitting groove, and the limit flange is located between the limit pin and the bottom surface of the fitting groove.

3. The water-based proportional pressure relief valve of claim 2, wherein the stop flange is spaced apart from the stop pin when the relief valve port is in the closed state.

4. The water-based proportional pressure-reducing overflow valve of claim 2, wherein the limiting flange is provided with a spiral groove for screwing the limiting pin in.

5. The water-based proportional pressure relief valve of claim 1, wherein an outer surface of the pressure relief valve core comprises a flow guiding conical surface.

6. The water-based proportional pressure relief valve of claim 1, wherein an outer surface of the pressure relief spool includes a stepped surface that is opposite to a flow direction of the water base.

7. The water-based proportional pressure-reducing overflow valve according to claim 1, wherein the electromechanical conversion element comprises a proportional electromagnet and a push rod connected with a driving end of the proportional electromagnet, the water-based proportional pressure-reducing overflow valve further comprises a lever, a first end of the lever is pivotally connected with the valve body, the push rod abuts against a second end of the lever, a second end of the pressure-reducing valve core abuts against the middle of the lever, and a second end face of the pressure-reducing valve core is a spherical surface.

8. The water-based proportional pressure-reducing overflow valve of claim 1, wherein the valve housing includes a liquid supply valve housing, a pressure-reducing valve housing, and an unloading valve housing, which are sequentially arranged, the liquid supply cavity is formed in the liquid supply valve housing, the pressure-reducing cavity and the first chamber are formed in the pressure-reducing valve housing, the second chamber is formed in the unloading valve housing, the liquid supply valve housing and the pressure-reducing valve housing are in interference fit, a pressure-reducing valve seat is sandwiched between the liquid supply valve housing and the pressure-reducing valve housing, the pressure-reducing valve housing and the unloading valve housing are in interference fit and connected through a screw, an overflow valve seat is sandwiched between the pressure-reducing valve housing and the unloading valve housing, a drainage inclined hole communicating the pressure-reducing cavity and the first chamber is formed in the pressure-reducing valve housing, and the unloading valve housing and the valve housing are in threaded fit.

9. The water-based proportional pressure-reducing overflow valve of claim 8, wherein the pressure-reducing valve sleeve comprises a first valve sleeve and a second valve sleeve, the first valve sleeve is in interference fit with the second valve sleeve, the pressure-reducing cavity is formed in the first valve sleeve, the first chamber is formed in the second valve sleeve, the pressure-reducing valve core is provided with a first drainage hole, the overflow valve core is provided with a second drainage hole, and the pressure-reducing cavity is communicated with the first chamber through the first drainage hole and the second drainage hole.

10. The water-based proportional pressure-reducing overflow valve of claim 1, wherein the number of the valve sleeves, the pressure-reducing valve core and the overflow valve core is two and one for one, the two valve sleeves are all installed in the valve body, and the electro-mechanical conversion element is a double-headed proportional electromagnet.

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