CN217502595U - Pressure reducing valve - Google Patents

Abstract

A pressure reducing valve comprises a valve block, wherein a valve cavity, an oil inlet channel and an oil outlet channel which are communicated with the valve cavity are arranged in the valve block, a supporting seat, a valve seat and a restrictor are arranged in the valve cavity, the valve seat is accommodated in the supporting seat and positioned at the lower end of the supporting seat, the valve seat is provided with an oil inlet which is communicated with the oil inlet channel and the inside of the supporting seat in a penetrating manner, the supporting seat is provided with an oil outlet which is communicated with the inside of the supporting seat in a penetrating manner, the restrictor is arranged below the valve seat, and the restrictor is provided with a throttling hole in a penetrating manner along the axial direction; the pressure reducing valve also comprises a moving iron arranged above the valve seat, and the moving iron can move up and down to open the oil inlet or seal the oil inlet; when the moving iron moves downwards, the oil inlet is sealed, so that the oil inlet channel is not communicated with the oil outlet channel; and when the moving iron moves upwards, the oil inlet is opened, so that the oil inlet channel is communicated with the oil outlet channel sequentially through the throttling hole, the oil inlet and the oil outlet.

Description

Pressure reducing valve

Technical Field

The utility model relates to the technical field of valves, especially, relate to a relief pressure valve.

Background

The hydraulic brake system of the passenger car is changing to the wire control direction comprehensively, and an electronic mechanical hydraulic system is the mainstream type. Currently, a brake-by-wire system mainly comprises a master cylinder, an electric cylinder, a wheel cylinder, an electromagnetic valve, a sensor and an ECU; after a driver steps on a brake pedal, an ECU of the brake-by-wire system detects a change value of a pedal displacement sensor connected with the pedal, and then determines how much brake pressure needs to be provided by an electric cylinder and requires a motor to work according to the change value, so that brake fluid is compressed, hydraulic pressure is built and is transmitted to the wheel cylinder, and the requirement of providing brake force for a vehicle is met.

Pressure reducing valves are widely used in hydraulic control systems, and are required in hydraulic brake systems of vehicles, mainly for reducing inlet pressure to a certain required outlet pressure. However, the overall structure of the conventional pressure reducing valve is still relatively complex, and the orifice is generally arranged in the support seat, so that the process difficulty of parts is relatively high, the cost is relatively high, and the application of the pressure reducing valve in the industrial field is limited, so that the conventional pressure reducing valve needs to be improved.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a pressure reducing valve with simple overall structure and low process difficulty and cost of parts.

The utility model provides a pressure reducing valve, including the valve piece, be equipped with the valve pocket in the valve piece and with the oil feed passageway and the passageway that produces oil that the valve pocket communicates, be provided with supporting seat, disk seat and flow controller in the valve pocket, the disk seat is acceptd in the supporting seat and is located the lower extreme of supporting seat, the disk seat runs through to be equipped with the oil inlet that communicates oil feed passageway and supporting seat inside, the supporting seat runs through to be equipped with the oil-out that communicates oil feed passageway and supporting seat inside, the flow controller sets up in the below of disk seat, the flow controller runs through along the axial and is equipped with the orifice; the pressure reducing valve also comprises a moving iron arranged above the valve seat, and the moving iron can move up and down to open the oil inlet or seal the oil inlet; when the moving iron moves downwards, the oil inlet is sealed, so that the oil inlet channel is not communicated with the oil outlet channel; and when the moving iron moves upwards, the oil inlet is opened, so that the oil inlet channel is communicated with the oil outlet channel sequentially through the throttling hole, the oil inlet and the oil outlet.

In one embodiment, the supporting seat is a hollow ring shape and is in a funnel shape with a wide top and a narrow bottom, the oil outlet is arranged through the side wall of the supporting seat, and a first cavity is formed inside the supporting seat.

In one embodiment, the bottom of the moving iron is fixedly connected with a valve rod, the valve rod extends into the first cavity, and the bottom end of the valve rod is used for sealing the oil inlet.

In an embodiment, the inner diameter of the upper end of the supporting seat is larger than the inner diameter of the lower end of the supporting seat, a step portion is formed between the upper end of the supporting seat and the lower end of the supporting seat, the oil outlet penetrates through the side wall of the upper end of the supporting seat and is arranged, and the oil outlet is located above the step portion.

In one embodiment, a sealing ring is arranged outside the supporting seat in the valve cavity, and the sealing ring is located below the step part and clamped between the inner wall of the valve cavity and the outer wall of the supporting seat.

In one embodiment, the restrictor is an injection molded part made of plastic, and the sealing ring is a lip-shaped ring and is made into an integral structure with the restrictor.

In one embodiment, the valve seat is in an inverted cylindrical shape, the oil inlet penetrates through the center of the top plate of the valve seat, a second cavity is formed inside the valve seat, and the throttling device extends into the second cavity.

In one embodiment, the restrictor comprises an insertion part and an end part, the diameter of the end part is larger than that of the insertion part, the insertion part is inserted into the second cavity from the bottom end of the valve seat and is fixedly connected with the valve seat, the end part is positioned outside the valve seat, and the throttling hole is axially arranged in the insertion part or the end part; when the moving iron moves upwards to open the oil inlet, the oil inlet channel is communicated with the oil outlet channel sequentially through the throttling hole, the second cavity, the oil inlet, the first cavity and the oil outlet.

In one embodiment, the oil inlet and the orifice are aligned vertically, and the oil inlet passage is located directly below the orifice.

In one embodiment, the bottom of the valve seat is provided with a flange surface protruding outwards, the bottom of the supporting seat is abutted against the flange surface, and the flange surface is located between the bottom and the end of the supporting seat.

In one embodiment, the outer wall of the valve seat and the inner wall of the lower end of the support seat are in interference fit, and the outer wall of the insert portion and the inner wall of the valve seat are in interference fit.

In one embodiment, a filter screen is further fixed on the throttling device and located between the oil inlet channel and the throttling hole.

In one embodiment, the pressure reducing valve is an electromagnetic valve, the pressure reducing valve further comprises a coil and a fixed iron, the fixed iron is arranged above the movable iron and is fixed, an elastic part is arranged between the fixed iron and the movable iron, the movable iron is driven to move upwards and compress the elastic part when the coil is powered on, and the elastic part pushes the movable iron to move downwards through elastic force when the coil is powered off.

In one embodiment, the pressure reducing valve further comprises a magnetism isolating pipe, the inside of the magnetism isolating pipe is a cavity, the fixed iron and the moving iron are contained in the magnetism isolating pipe, and the upper end of the supporting seat is fixedly connected with the lower end of the magnetism isolating pipe.

In one embodiment, the outer wall of the lower end of the magnetism isolating pipe and the inner wall of the upper end of the supporting seat are fixed through welding.

The embodiment of the utility model provides a pressure reducing valve is equipped with the valve pocket in the valve piece and with the oil feed passageway and the passageway of producing oil of valve pocket intercommunication, be provided with supporting seat, disk seat and flow controller in the valve pocket, the disk seat runs through and is equipped with the inside oil inlet of intercommunication oil feed passageway and supporting seat, the supporting seat runs through and is equipped with the intercommunication and goes out the oil-out of oil passageway and supporting seat inside, the flow controller sets up in the below of disk seat, the flow controller runs through along the axial and is equipped with the orifice. The pressure reducing valve can enable the oil inlet channel to be communicated with the oil outlet channel or to be blocked and not communicated through the up-and-down movement of the moving iron. The whole structure of the pressure reducing valve is simple, the pressure reducing valve is different from the conventional design of the throttling hole in the supporting seat, the supporting seat does not contain the throttling hole, the throttling hole is arranged on the throttling device, the throttling device can be an injection molding part, the process difficulty is low, and the cost is low.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a pressure reducing valve in an energized state according to an embodiment of the present invention.

Fig. 2 is a partial structural schematic view of the pressure reducing valve in fig. 1.

Fig. 3 is a schematic structural diagram of the pressure reducing valve in the power-off state according to the embodiment of the present invention.

Detailed Description

Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. All other embodiments obtained by a person skilled in the art without any inventive work based on the description of the present invention belong to the protection scope of the present invention.

The terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "horizontal", "vertical", and the like, refer to orientations or positional relationships based on the drawings, or the orientations or positional relationships that are conventionally found when the products of the present invention are used, and are used for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore are not to be construed as limiting the present invention.

Moreover, the terms "first," "second," "third," and the like are used solely to distinguish between similar elements and not to indicate or imply relative importance or a particular order.

Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.

An embodiment of the utility model provides a pressure reducing valve for the decompression effect reduces the inlet pressure to a certain required outlet pressure, and specifically, this pressure reducing valve can be applied to in the hydraulic braking system of passenger car, for example, be applied to in braking anti-lock brake system (ABS), automobile body electronic stability control system (ESC) or the brake-by-wire system, but not limited to this, this pressure reducing valve still can be applied to in other hydraulic control systems in addition.

Referring to fig. 1 and 2, the pressure reducing valve includes a valve block 10, and a valve cavity 11, and an oil inlet passage 14 and an oil outlet passage 13 communicated with the valve cavity 11 are disposed in the valve block 10. The valve cavity 11 is internally provided with a supporting seat 17, a valve seat 18 and a restrictor 41. The valve seat 18 is accommodated in the support seat 17 and is located at the lower end of the support seat 17. The valve seat 18 is provided with an oil inlet 23 through which the oil inlet passage 14 communicates with the inside of the support seat 17. The supporting seat 17 is provided with an oil outlet 22 through which the oil outlet channel 13 is communicated with the inside of the supporting seat 17. The orifice 41 is provided below the valve seat 18, and an orifice 42 is provided to axially penetrate the orifice 41.

Specifically, the pressure reducing valve is an electromagnetic valve, and the pressure reducing valve further comprises a moving iron 19 arranged above the valve seat 18, wherein the moving iron 19 can move up and down to open the oil inlet 23 or seal the oil inlet 23. Fig. 1 shows the power-on state of the pressure reducing valve, please refer to fig. 1, in the power-on state, the moving iron 19 is driven to move upwards, and the oil inlet 23 is opened when the moving iron 19 moves upwards, so that the oil inlet channel 14 is communicated with the oil outlet channel 13 sequentially through the throttle hole 42, the oil inlet 23 and the oil outlet 22.

Fig. 3 shows a power-off state of the pressure reducing valve, please refer to fig. 3, in the power-off state, the moving iron 19 is driven to move downwards, and when the moving iron 19 moves downwards, the oil inlet 23 is sealed, so that the oil inlet channel 14 is not communicated with the oil outlet channel 13.

The supporting seat 17 is a hollow ring shape and is in a funnel shape with a wide upper part and a narrow lower part. The oil outlet 22 is arranged through the side wall of the support seat 17. The interior of the support seat 17 forms a first cavity 51. The bottom of the moving iron 19 is fixedly connected with a valve rod 36, the valve rod 36 extends into the first cavity 51, the bottom end of the valve rod 36 is used for sealing the oil inlet 23, and when the moving iron 19 moves downwards, the valve rod 36 can be driven to move downwards to seal the oil inlet 23. Specifically, the inner diameter of the upper end of the support seat 17 is larger than the inner diameter of the lower end of the support seat 17, and a stepped portion 25 is formed between the upper end of the support seat 17 and the lower end of the support seat 17. The oil outlet 22 is arranged through the side wall of the upper end of the supporting seat 17, and the oil outlet 22 is positioned above the step part 25. A sealing ring 28 is arranged outside the supporting seat 17 in the valve cavity 11, and the sealing ring 28 is positioned below the step part 25 and is clamped between the inner wall of the valve cavity 11 and the outer wall of the supporting seat 17. By providing the seal ring 28, the oil in the oil outlet passage 13 and the oil inlet passage 14 cannot leak through the outside of the support seat 17, and can only communicate through the oil outlet 22, the first cavity 51 inside the support seat 17, the oil inlet 23, and the orifice 42.

The restrictor 41 is an injection molding made of plastic, and in the embodiment, the sealing ring 28 is a lip-shaped ring and is made into an integral structure with the restrictor 41, so that the manufacturing cost and the number of components can be reduced. In other embodiments, the seal ring 28 may also be an O-ring and be a separate two-piece component (i.e., non-integral structure) from the restrictor 41.

Specifically, the valve seat 18 is in an inverted cylindrical shape, the valve seat 18 includes an annular side wall and a top plate located at the top end of the side wall, and the oil inlet 23 is arranged at the center of the top plate of the valve seat 18 in a penetrating manner. The interior of the valve seat 18 forms a second cavity 52 and the restrictor 41 extends into the second cavity 52.

The restrictor 41 comprises an insertion portion 43 and an end portion 44, the diameter of the end portion 44 is larger than that of the insertion portion 43, the insertion portion 43 is inserted into the second cavity 52 from the bottom end of the valve seat 18 and is fixedly connected with the valve seat 18, the end portion 44 is located outside the valve seat 18, the orifice 42 is axially arranged in the insertion portion 43 or in the end portion 44, and in the embodiment, the orifice 42 is axially arranged in the insertion portion 43. When the moving iron 19 moves upwards to open the oil inlet 23, the oil inlet channel 14 is communicated with the oil outlet channel 13 sequentially through the throttling hole 42, the second cavity 52, the oil inlet 23, the first cavity 51 and the oil outlet 22. Specifically, the oil inlet 23 and the orifice 42 are aligned up and down. The oil outlet channel 13 is arranged along the horizontal direction, the oil inlet channel 14 is arranged along the vertical direction, and the oil inlet channel 14 is positioned right below the throttle hole 42.

In the present embodiment, the seal ring 28 is a lip ring and is integrally connected to the end 44 of the throttle 41.

The valve seat 18 is fixedly connected with the lower end of the supporting seat 17, specifically, the valve seat 18 and the lower end of the supporting seat 17 are pressed in an interference fit manner, that is, the outer wall of the valve seat 18 and the inner wall of the lower end of the supporting seat 17 are in an interference fit manner. The restrictor 41 is fixedly connected with the valve seat 18, and specifically, the restrictor 41 and the valve seat 18 are pressed in an interference fit mode, namely, the outer wall of the insertion part 43 of the restrictor 41 and the inner wall of the valve seat 18 are in an interference fit mode.

In the present embodiment, the orifice 42 has a hole diameter of 0.3mm to 0.6mm and a length of 0.3mm to 0.4 mm. If the diameter of the orifice 42 is too large, the throttling effect may be impaired, and if the length of the orifice 42 is too large, the flow rate may be too small.

The bottom of the valve seat 18 is provided with a flange surface 31 protruding outwards, the bottom of the support seat 17 abuts against the flange surface 31, and the flange surface 31 is located between the bottom of the support seat 17 and the end 44 of the restrictor 41 to prevent the valve seat 18 from being displaced relative to the support seat 17 due to long-term hydraulic pressure. For increased stability, the outer wall of the valve seat 18 and the inner wall of the support seat 17 may be further fixed by laser welding.

Furthermore, a filter screen 47 is fixed on the restrictor 41, and the filter screen 47 is located between the oil inlet passage 14 and the orifice 42. The filter screen 47 is arranged at the position of the oil inlet 23 in the valve cavity 11, so that impurities in the oil can be filtered, and the impurities are prevented from entering the valve cavity 11.

Specifically, the pressure reducing valve is an electromagnetic valve, the pressure reducing valve further comprises a coil 37 and a fixed iron 38, the fixed iron 38 is arranged above the movable iron 19, the fixed iron 38 is fixed, an elastic part 24 is arranged between the fixed iron 38 and the movable iron 19, one end of the elastic part 24 abuts against the fixed iron 38, and the other end of the elastic part 24 abuts against the movable iron 19. Specifically, the elastic member 24 may be a spring, but is not limited thereto. In the present embodiment, the movable iron 19 has a recess (not numbered) formed at an end facing the fixed iron 38, and the spring is accommodated in the recess. When the coil 37 is electrified, the moving iron 19 is driven to move upwards and compress the elastic piece 24, and when the coil 37 is powered off, the elastic piece 24 pushes the moving iron 19 to move downwards through elastic force.

Further, the pressure reducing valve further includes a magnetic isolation pipe 39, an upper end of the magnetic isolation pipe 39 is sealable, a lower end thereof is open, an interior of the magnetic isolation pipe 39 is a cavity, and the fixed iron 38 and the moving iron 19 are accommodated in the magnetic isolation pipe 39 through the opening at the lower end of the magnetic isolation pipe 39. The fixed iron 38 is fixed in the magnetism isolating pipe 39, and the moving iron 19 is movable up and down in the magnetism isolating pipe 39. The coil 37 is disposed outside the magnetism isolating pipe 39. The fixed iron 38 is fixedly connected with the upper end of the magnetism isolating pipe 39, and specifically, the outer wall of the fixed iron 38 and the inner wall of the upper end of the magnetism isolating pipe 39 are fixed through laser welding. The upper end of the supporting seat 17 is fixedly connected with the lower end of the magnetism isolating pipe 39, and specifically, the outer wall of the lower end of the magnetism isolating pipe 39 and the inner wall of the upper end of the supporting seat 17 are fixed through laser welding.

When the coil 37 is electrified, the fixed iron 38 and the moving iron 19 are magnetized to generate suction force, because the fixed iron 38 and the magnetism isolating pipe 39 are fixed by welding and cannot move, the moving iron 19 moves upwards towards the fixed iron 38 due to the attraction of electromagnetic force, overcomes spring force to compress a spring, finally the moving iron 19 drives the valve rod 36 to move upwards to be separated from the valve seat 18, the oil inlet 23 is opened, as shown in fig. 1, at the moment, the oil inlet channel 14 is communicated with the oil outlet channel 13 sequentially through the throttling hole 42, the second cavity 52, the oil inlet 23, the first cavity 51 and the oil outlet 22, and brake fluid flows upwards to realize a pressure reduction function.

When the coil 37 is powered off, the spring pushes the moving iron 19 downwards by using elastic force, and finally the moving iron 19 drives the valve rod 36 to move downwards to be attached to the top plate of the valve seat 18 and seal the oil inlet 23, as shown in fig. 3, at this time, the oil inlet channel 14 and the oil outlet channel 13 are blocked and not communicated.

In this embodiment, the valve block 10 may be made of aluminum, the moving iron 19 and the fixed iron 38 may be made of mild steel, and the support seat 17, the valve seat 18 and the magnetism isolating pipe 39 may be made of free-cutting stainless steel. The valve stem 36 and the restrictor 41 may be injection molded parts made of plastic.

The throttling hole 42 is arranged in the throttling device 41, the throttling device 41 is an injection molding part, and the throttling hole 42 of the throttling device 41 is less in process difficulty and lower in cost; meanwhile, the support seat 17 is not provided with a throttling hole, so that the shape is simple, the process difficulty is reduced, and the cost is also reduced.

The embodiment of the utility model provides a pressure reducing valve is equipped with valve pocket 11 in the valve piece 10 and with the oil feed passageway 14 and the passageway 13 that produces oil of 11 intercommunications of valve pocket, be provided with supporting seat 17, disk seat 18 and flow controller 41 in the valve pocket 11, disk seat 18 runs through and is equipped with the inside oil inlet 23 of intercommunication oil feed passageway 14 and supporting seat 17, supporting seat 17 runs through and is equipped with the intercommunication and produces oil passageway 13 and the inside oil-out 22 of supporting seat 17, flow controller 41 sets up in disk seat 18's below, flow controller 41 runs through along the axial and is equipped with orifice 42. The pressure reducing valve can make the oil inlet channel 14 communicated with the oil outlet channel 13 or be blocked and not communicated through the up-and-down movement of the movable iron 19. The whole structure of the pressure reducing valve is simple, the pressure reducing valve is different from the conventional design of the throttling hole in the supporting seat, the supporting seat does not contain the throttling hole, the throttling hole is arranged on the throttling device, the throttling device can be an injection molding part, the process difficulty is low, and the cost is low.

In this embodiment, the pressure reducing valve is a solenoid valve, and when the stroke is set, the restrictor 41 may not be installed first, so that the stroke setting of the solenoid valve is not hindered.

The pressure reducing valve provided by the embodiment adopts the design of oil inlet from the bottom and matching with the elastic force of the spring, and can also realize the function of line control pressure reduction, namely the opening degree of the oil inlet 23 can be changed between full opening and full closing, and the flow control is realized by utilizing the opening degree change of the oil inlet 23. When the online control pressure reduction is carried out, the flow field problem is considered, the movable iron 19 is adopted to match with the valve rod 36, the movable iron 19 drives the valve rod 36 to move up and down, and the oil inlet 23 is opened or sealed.

The above embodiments are only specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (15)

1. A pressure reducing valve comprises a valve block, wherein a valve cavity, an oil inlet channel and an oil outlet channel are arranged in the valve block, the oil inlet channel and the oil outlet channel are communicated with the valve cavity, and the pressure reducing valve is characterized in that a supporting seat, a valve seat and a throttler are arranged in the valve cavity; the pressure reducing valve also comprises a moving iron arranged above the valve seat, and the moving iron can move up and down to open the oil inlet or seal the oil inlet; when the moving iron moves downwards, the oil inlet is sealed, so that the oil inlet channel is not communicated with the oil outlet channel; when the moving iron moves upwards, the oil inlet is opened, so that the oil inlet channel is communicated with the oil outlet channel sequentially through the throttling hole, the oil inlet and the oil outlet.

2. The pressure reducing valve as claimed in claim 1, wherein the support seat is hollow and annular, and has a funnel shape with a wide top and a narrow bottom, the oil outlet is disposed through a side wall of the support seat, and a first cavity is formed inside the support seat.

3. The pressure reducing valve according to claim 2, wherein a valve rod is fixedly connected to the bottom of the moving iron, the valve rod extends into the first cavity, and the bottom end of the valve rod is used for sealing the oil inlet.

4. The pressure reducing valve according to claim 2, wherein an inner diameter of an upper end of the support seat is larger than an inner diameter of a lower end of the support seat, a stepped portion is formed between the upper end of the support seat and the lower end of the support seat, the oil outlet is provided through a side wall of the upper end of the support seat, and the oil outlet is located above the stepped portion.

5. The pressure reducing valve according to claim 4, wherein a sealing ring is disposed in the valve chamber outside the support seat, and the sealing ring is located below the step portion and sandwiched between an inner wall of the valve chamber and an outer wall of the support seat.

6. The pressure relief valve of claim 5, wherein the restrictor is an injection molded piece of plastic, and the sealing ring is a lip ring and is formed as a unitary structure with the restrictor.

7. The pressure reducing valve according to claim 2, wherein the valve seat is formed in an inverted cylindrical shape, the oil inlet is disposed through a center of a top plate of the valve seat, a second cavity is formed inside the valve seat, and the restrictor extends into the second cavity.

8. The pressure reducing valve of claim 7, wherein the restrictor includes an insert portion and an end portion, the end portion having a diameter greater than a diameter of the insert portion, the insert portion being inserted into the second cavity from a bottom end of the valve seat and fixedly connected to the valve seat, the end portion being located outside the valve seat, the orifice being axially disposed in the insert portion or in the end portion; when the moving iron moves upwards to open the oil inlet, the oil inlet channel is communicated with the oil outlet channel sequentially through the throttling hole, the second cavity, the oil inlet, the first cavity and the oil outlet.

9. The pressure reducing valve of claim 8, wherein the oil inlet and the orifice are aligned one above the other, and the oil inlet passage is located directly below the orifice.

10. The pressure relief valve of claim 8, wherein the bottom of the seat is outwardly convexly provided with a flange surface against which the bottom of the seat abuts, the flange surface being located between the bottom of the seat and the end.

11. The pressure relief valve of claim 8, wherein the outer wall of the valve seat and the inner wall of the lower end of the support seat are in an interference fit, and the outer wall of the insert and the inner wall of the valve seat are in an interference fit.

12. The pressure reducing valve of claim 8, wherein a filter screen is further secured to the restrictor, the filter screen being positioned between the oil inlet passage and the orifice.

13. The pressure reducing valve according to any one of claims 1 to 12, wherein the pressure reducing valve is a solenoid valve, the pressure reducing valve further comprises a coil and a fixed iron, the fixed iron is disposed above the movable iron, the fixed iron is fixed, an elastic member is disposed between the fixed iron and the movable iron, the coil drives the movable iron to move upward and compress the elastic member when the coil is powered on, and the elastic member pushes the movable iron to move downward by an elastic force when the coil is powered off.

14. The pressure reducing valve according to claim 13, further comprising a magnetism isolating pipe, wherein the magnetism isolating pipe has a hollow interior, the fixed iron and the movable iron are accommodated in the magnetism isolating pipe, and an upper end of the support base is fixedly connected to a lower end of the magnetism isolating pipe.

15. The pressure reducing valve as claimed in claim 14, wherein the outer wall of the lower end of the magnetism isolating pipe and the inner wall of the upper end of the support seat are fixed by welding.

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