Plunger type pressure reducing valve with high pressure reducing ratio

Abstract

The utility model discloses a plunger type pressure reducing valve with a high pressure reducing ratio, and relates to the technical field of pressure reducing valves. The valve comprises a valve body and a valve sleeve arranged on a partition wall in the valve body, a through hole is formed in the center of the valve sleeve, a plunger is arranged in the through hole in a sliding fit mode, two cylindrical annular grooves are formed in the inner wall of the through hole, and an annular partition wall is arranged between every two adjacent annular grooves. The upper planes of the two annular grooves and the annular blade edge on the frustum below the plunger are respectively used as valve seats of a valve port v3, a valve port v2 and a valve port v1; three groups of horizontally parallel notches are formed in the cylinder, each group is provided with three equant groove-shaped notches, guide surfaces are reserved among the notches, the lower planes of the upper two groups of notches and the first sealing gaskets serve as valve clacks of a valve port v3, a valve port v2 and a valve port v1 respectively, and the distances between valve seats of the valve ports and the valve clacks are equal; the pressure drop on each valve port and the flow speed of a medium flowing through the valve port are reduced, the problem of concentricity of three holes is avoided, and difficulties in machining, assembling and part movement are reduced.

Description

Technical Field

[0001] The utility model relates to the field of pressure reducing valves, and more specifically, to a plunger type pressure reducing valve with a high pressure reducing ratio. Background Art

[0002] The pressure reducing valve can reduce the high pressure before the valve to the low pressure after the valve, and basically keep the output pressure unchanged. The adjustable pressure reducing valves currently available on the market are all single valve ports, and the actual pressure reduction ratio is no more than 3. When the pressure reduction ratio is larger, the high pressure difference will be concentrated on the valve port due to the small opening of the valve port. The resulting high-speed fluid will strongly scour the valve disc and valve seat that make up the valve port, thereby generating noise or vibration, and even causing cavitation, greatly shortening the life of the pressure reducing valve. Therefore, when the pressure reduction ratio is greater than 3, two or more pressure reducing valves are often connected in series to reduce the pressure drop on each pressure reducing valve, which increases the complexity of installation, brings inconvenience to daily maintenance, and increases costs.

[0003] Chinese patent announcement number CN102853155A, announcement date January 2, 2013, the name of the invention is an adjustable high pressure reduction ratio pressure reducing valve, the application discloses "an adjustable high pressure reduction ratio pressure reducing valve", the patent uses multiple valve ports to perform multi-stage throttling on the flowing medium, so that the high pressure difference is evenly distributed on each valve port, so that the pressure difference on each valve port is greatly reduced, and the flow rate of the medium through the valve port is greatly reduced, and the generation of noise, vibration and cavitation is prevented. Practice has proved that the pressure reduction ratio can reach more than 10, but the pressure reducing valve has the problem of three-hole concentricity, and the upper and lower ends of the valve stem move in the guide holes of the relevant parts, which increases the number of parts and the complexity of the structure, and will also cause internal leakage. Utility Model Content

[0004] In order to overcome the above technical deficiencies, the utility model provides a plunger-type high pressure reduction ratio pressure reducing valve, which can reduce the pressure drop on each valve port and the flow rate of the medium flowing through the valve port while avoiding the problem of multi-hole concentricity and reducing the difficulties in processing, assembly and parts movement.

[0005] In order to solve the above technical problems, the utility model adopts the following technical scheme: a plunger-type high pressure reduction ratio pressure reducing valve, comprising a valve body and a valve sleeve arranged in the valve body, a through hole in the center of the valve sleeve, a plunger is slidably installed in the through hole, a plurality of annular grooves are arranged on the inner wall of the through hole, an annular partition wall is arranged between adjacent annular grooves, the upper plane of the annular groove and the annular edge on the cone below the plunger serve as valve seats for valve port v3, valve port v2 and valve port v1 respectively, the plunger has three groups of horizontal parallel notches, each group has three equally divided groove-shaped notches, and a guide surface is left between the groove-shaped notches, the lower planes of the upper two groups of groove-shaped notches and a sealing gasket installed on the lower side of the plunger serve as valve flaps for valve ports v3, v2, and v1 respectively, and the distance between the valve seat and the valve flap of each valve port is equal.

[0006] The pressure reducing principle and pressure regulating method of this patent are the same as those of ordinary adjustable pressure reducing valves, which are well known to people in the industry and will not be elaborated here. This patent has three groups of valve ports (more valve ports can be added if necessary); under the condition of high pressure reducing ratio, the pressure difference can be evenly distributed to the three groups of valve ports, which can greatly reduce the speed of the medium flowing through the valve ports and prevent the generation of noise, vibration and cavitation. According to the calculation of fluid mechanics, it can be obtained that:

[0007]

[0008] In the formula, V is the flow rate of the medium when it flows through the valve port.

[0009] C-Flow coefficient of valve port

[0010] ΔP-pressure difference at both ends of the valve port From the above formula, we can know that the flow rate of the medium through the valve port is Doubled.

[0011] In addition, when the valve body is working normally, the plunger moves up and down in the inner hole of the valve sleeve, and there is only one guide hole. Therefore, there is no problem of needing three holes to be concentric, which reduces the difficulties in processing, assembly and parts movement.

[0012] Preferably, a lower pressure plate, a diaphragm and an upper pressure plate are sequentially sleeved on the small shaft at the upper end of the plunger, and the lower pressure plate, the diaphragm and the upper pressure plate are connected to the plunger as a whole through a nut 1 and a washer 2, so as to facilitate the assembly connection between the plunger and the valve sleeve and the valve body.

[0013] Preferably, a nut three and a washer three are provided on the small shaft of the plunger below the sealing seat, connecting the sealing seat and the plunger as one, and a sealing gasket one is arranged in an annular groove above the sealing seat.

[0014] The small shaft at the lower end is sleeved with a sealing pad seat, the sealing pad is arranged in the annular groove above the sealing pad seat, and a nut 2 and a washer 3 are fixed on the lower end surface of the plunger. The above structure is a further limitation on the plunger part in the pressure reducing valve.

[0015] Preferably, it also includes a pressure regulating assembly, which includes a positioning screw and an O-ring. A stepped hole with a small top and a large bottom is provided at the center of the lower valve cover. The large hole is a screw hole. An O-ring is provided in the small hole. The small shaft above the positioning screw is movably fitted in the small hole. The external thread of the positioning screw is screwed into the screw hole. The top surface of the small shaft of the positioning screw abuts against the bottom surface of the small shaft at the lower end of the plunger.

[0016] The axial position of the plunger can be adjusted by turning the positioning screw to adjust the position of each internal valve port. After the adjustment meets the requirements, tighten it with the adjusting screw.

[0017] Preferably, a pressure regulating mechanism for adjusting the outlet pressure is provided in the upper valve cover, and the pressure regulating mechanism includes a pressure regulating screw, an upper spring seat and an upper pressure plate, a spring is provided between the upper pressure plate and the spring seat, a screw hole is provided in the center of the spring seat, the screw hole is screwed with the external thread of the pressure regulating screw, and a bearing is provided between the upper part of the pressure regulating screw and the upper valve cover, which is used for pressure regulation in the valve body.

[0018] Preferably, an upper valve cover and a lower valve cover are respectively provided on the upper and lower sides of the valve body; a water inlet hole and a water outlet hole are respectively provided in the horizontal direction of the valve body, a partition wall with a vertical through hole is provided between the two holes, and the valve sleeve is provided in the vertical through hole of the partition wall. The upper valve cover and the lower valve cover are respectively fixed to the upper plane and the lower plane of the valve body with a plurality of screws and gaskets.

[0019] Preferably, the valve body is provided with an upper end hole and a lower end hole in the vertical direction, and the center lines of the upper and lower end holes and the vertical through holes on the partition wall are consistent and intersect perpendicularly with the center lines of the water inlet hole and the water outlet hole. The above structure further limits the position of the water inlet hole and the water outlet hole relative to the valve body.

[0020] As a preferred embodiment, the through hole on the horizontal partition wall is stepped, with a larger diameter at the top and a smaller diameter at the bottom, a cylindrical hole at the top and a threaded hole at the bottom; the outer thread with a slightly smaller outer diameter below the outer circle of the valve sleeve is screwed with the inner thread below the through hole on the partition wall. The outer circle is assembled with the cylindrical hole above the through hole, and there is a frustum at the lower end.

[0021] Compared with the prior art, the utility model has the beneficial effects of reducing the pressure drop on each valve port to reduce the flow rate of the medium flowing through the valve port, preventing the generation of noise, vibration and cavitation, and at the same time avoiding the problem of three-hole concentricity, reducing the difficulties in processing, assembly and part movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a plunger-type high pressure reduction ratio pressure reducing valve of the utility model.

[0023] Figure 2 It is a cross-sectional view of the utility model at "AA".

[0024] In the figure: valve body 1; screw 2; gasket 3; upper pressure plate 4; outer cover 5; pressure regulating screw 6; bearing 7; upper spring seat 8; upper valve cover 9; spring 10; nut one 11; gasket two 12; diaphragm 13; lower pressure plate 14; plunger 15; valve sleeve 16; sealing gasket one 17; sealing gasket seat 18; nut two 19; gasket three 20; O-ring sealing gasket 21; positioning screw 22; tightening screw 23; sealing gasket two 24; lower valve cover 25. DETAILED DESCRIPTION

[0025] The technical solution of the utility model is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0026] Example 1: See attached Figure 1 To Attachment Figure 2 The plunger type high pressure reduction ratio pressure reducing valve is composed of a valve body 1, an upper valve cover 9, a pressure regulating mechanism, a plunger 15, a valve sleeve 16, a sealing gasket 17, a sealing gasket seat 18, a sealing gasket 24 and a lower valve cover 25. The upper valve cover 9 and the lower valve cover 25 are respectively fixed on the upper plane and the lower plane of the valve body 1 by a number of screws 2 and gaskets 3, and the outer edge of the diaphragm 13 is pressed tightly on the corresponding planes of the upper valve cover 9 and the valve body 1. A sealing gasket 24 is arranged between the lower valve cover 25 and the corresponding plane of the lower end of the valve body 1. The inner cavity of the upper valve cover 9 is provided with a pressure regulating mechanism composed of a pressure regulating screw 6, a bearing 7, an upper spring seat 8, a spring 10, a diaphragm 13, an upper pressure plate 4, and a lower pressure plate 14.

[0027] The holes at both ends of the valve body 1 in the horizontal direction are respectively the water inlet hole and the water outlet hole, and the center lines of the two holes are consistent; the through holes at both ends in the vertical direction are consistent with the center lines of the through holes on the middle horizontal partition wall W, and intersect with the horizontal center line vertically; the through holes on the horizontal partition wall W are stepped, with a larger diameter at the top and a smaller diameter at the bottom, a cylindrical hole at the top, and an internal threaded hole at the bottom.

[0028] The outer thread with a slightly smaller outer diameter below the outer circle of the valve sleeve 16 is screwed with the inner thread below the through hole on the partition wall W, and the outer circle is assembled with the cylindrical hole above the through hole, and there is a frustum at the lower end; there is a through hole in the center of the valve sleeve 16, and there are two annular grooves in the inner cavity. The two annular grooves have an annular partition wall, and the upper planes of the two annular convex grooves and the annular edges on the lower frustum serve as valve seats for valve ports v3, v2, and v1 respectively; there are a number of notches a on the outer edge of the top end of the valve sleeve 16 for tightening the valve sleeve 16 during assembly.

[0029] The middle section of the plunger 15 is slidably matched with the through hole of the valve sleeve 16 and serves as a guide hole for the plunger 15 to move up and down. The cylinder has three groups of horizontal parallel notches, each group has three equally divided groove-shaped notches. The height of the notches can ensure smooth flow of the medium, and a guide surface is left between the notches (refer to the attached Figure 2), the lower planes of the two groups of notches and the sealing gasket 17 serve as valve flaps of valve ports v3, v2, and v1 respectively, and the distances between the valve seats and valve flaps of each valve port are equal.

[0030] The pressure reducing principle and pressure regulating method of this patent are the same as those of ordinary adjustable pressure reducing valves, which are well known to people in the industry and will not be elaborated here. This patent has three groups of valve ports (more valve ports can be added if necessary); under the condition of high pressure reducing ratio, the pressure difference can be evenly distributed to the three groups of valve ports, which can greatly reduce the speed of the medium flowing through the valve ports, preventing the generation of noise, vibration and cavitation. According to the calculation of fluid mechanics, it can be obtained that:

[0031]

[0032] In the formula, V is the flow rate of the medium when it flows through the valve port.

[0033] C-Flow coefficient of valve port

[0034] ΔP-pressure difference at both ends of the valve port From the above formula, we can know that the flow rate of the medium through the valve port is It is increased by times. After calculation, for three valve ports, the flow rate of the medium flowing through the valve port is 57.79 of the flow rate of the single valve port.

[0035] When the valve body is working normally, the plunger 15 moves up and down in the inner hole of the valve sleeve 16, and there is only one guide hole. Therefore, the present invention can reduce the pressure drop of each valve port and the flow rate of the medium flowing through the valve port, prevent the generation of noise, vibration and cavitation, and avoid the problem of three holes being concentric, thereby reducing the difficulties in processing, assembly and movement of parts; thirdly, the upper and lower ends of the plunger 15 do not need to be guided, thereby simplifying the overall structure and reducing parts.

[0036] The design concept of this patent is also applicable to other valves with high pressure difference, high throttling and three-hole concentric requirements, and the number of valve ports can be increased as needed.

[0037] Embodiment 2:

[0038] See attached Figure 1 To Attachment Figure 2 The plunger type high pressure reduction ratio pressure reducing valve is composed of a valve body 1, an upper valve cover 9, a pressure regulating mechanism, a plunger 15, a valve sleeve 16, a sealing gasket 17, a sealing gasket seat 18, a sealing gasket 24 and a lower valve cover 25. The upper valve cover 9 and the lower valve cover 25 are respectively fixed on the upper plane and the lower plane of the valve body 1 by a number of screws 2 and gaskets 3, and the outer edge of the diaphragm 13 is pressed tightly on the corresponding planes of the upper valve cover 9 and the valve body 1. A sealing gasket 24 is arranged between the lower valve cover 25 and the corresponding plane of the lower end of the valve body 1. The inner cavity of the upper valve cover 9 is provided with a pressure regulating mechanism composed of a pressure regulating screw 6, a bearing 7, an upper spring seat 8, a spring 10, a diaphragm 13, an upper pressure plate 4, and a lower pressure plate 14.

[0039] The holes at both ends of the valve body 1 in the horizontal direction are respectively the water inlet hole and the water outlet hole, and the center lines of the two holes are consistent; the through holes at both ends in the vertical direction are consistent with the center lines of the through holes on the middle horizontal partition wall W, and intersect with the horizontal center line vertically; the through holes on the horizontal partition wall W are stepped, with a larger diameter at the top and a smaller diameter at the bottom, a cylindrical hole at the top, and an internal threaded hole at the bottom.

[0040] The outer thread with a slightly smaller outer diameter below the outer circle of the valve sleeve 16 is screwed with the inner thread below the through hole on the partition wall W, and the outer circle is assembled with the cylindrical hole above the through hole, and there is a frustum at the lower end; there is a through hole in the center of the valve sleeve 16, and there are two annular grooves in the inner cavity. The two annular grooves have an annular partition wall, and the upper planes of the two annular convex grooves and the annular edges on the lower frustum serve as valve seats for valve ports v3, v2, and v1 respectively; there are a number of notches a on the outer edge of the top end of the valve sleeve 16 for tightening the valve sleeve 16 during assembly.

[0041] The middle section of the plunger 15 is a cylinder. The small shaft at the upper end is sleeved with a lower pressure plate 14, a diaphragm 13 and an upper pressure plate 4, and a nut 11. The second washer 12 is connected to the plunger 15 as a whole; the small shaft at the lower end is sleeved with a sealing pad seat 18, a sealing pad 17 is arranged in the annular groove above it, and a nut 19 and a third washer 20 are fixed on the lower end surface of the plunger 15; the middle section of the plunger 15 is slidably matched with the through hole of the valve sleeve 16, and serves as a guide hole for the plunger 15 to move up and down. There are three groups of horizontal parallel notches on the cylinder, each group has three equally divided groove-shaped notches, the height of the notches can ensure the smooth flow of the medium, and a guide surface is left between the notches (refer to the attached Figure 2 ), the lower planes of the two groups of notches and the sealing gasket 17 serve as valve flaps of valve ports v3, v2, and v1 respectively, and the distances between the valve seats and valve flaps of each valve port are equal.

[0042] The pressure reducing principle and pressure regulating method of this patent are the same as those of ordinary adjustable pressure reducing valves, which are well known to people in the industry and will not be elaborated here. This patent has three groups of valve ports (more valve ports can be added if necessary); under the condition of high pressure reducing ratio, the pressure difference can be evenly distributed to the three groups of valve ports, which can greatly reduce the speed of the medium flowing through the valve ports, preventing the generation of noise, vibration and cavitation. According to the calculation of fluid mechanics, it can be obtained that:

[0043]

[0044] In the formula, V is the flow rate of the medium when it flows through the valve port.

[0045] C-Flow coefficient of valve port

[0046] ΔP-pressure difference at both ends of the valve port From the above formula, we can know that the flow rate of the medium through the valve port is It is increased by times. After calculation, for three valve ports, the flow rate of the medium flowing through the valve port is 57.79 of the flow rate of the single valve port.

[0047] When the valve body is working normally, the plunger 15 moves up and down in the inner hole of the valve sleeve 16, and there is only one guide hole. Therefore, the present invention can reduce the pressure drop of each valve port and the flow rate of the medium flowing through the valve port, prevent the generation of noise, vibration and cavitation, and avoid the problem of three holes being concentric, thereby reducing the difficulties in processing, assembly and movement of parts; thirdly, the upper and lower ends of the plunger 15 do not need to be guided, thereby simplifying the overall structure and reducing parts.

[0048] The design concept of this patent is also applicable to other valves with high pressure difference, high throttling and three-hole concentric requirements, and the number of valve ports can be increased as needed.

[0049] Embodiment 3:

[0050] See attached Figure 1 To Attachment Figure 2 The plunger type high pressure reduction ratio pressure reducing valve is composed of a valve body 1, an upper valve cover 9, a pressure regulating mechanism, a plunger 15, a valve sleeve 16, a sealing gasket 17, a sealing gasket seat 18, a sealing gasket 24 and a lower valve cover 25. The upper valve cover 9 and the lower valve cover 25 are respectively fixed on the upper plane and the lower plane of the valve body 1 by a number of screws 2 and gaskets 3, and the outer edge of the diaphragm 13 is pressed tightly on the corresponding planes of the upper valve cover 9 and the valve body 1. A sealing gasket 24 is arranged between the lower valve cover 25 and the corresponding plane of the lower end of the valve body 1. The inner cavity of the upper valve cover 9 is provided with a pressure regulating mechanism composed of a pressure regulating screw 6, a bearing 7, an upper spring seat 8, a spring 10, a diaphragm 13, an upper pressure plate 4, and a lower pressure plate 14. The holes at both ends of the valve body 1 in the horizontal direction are respectively the water inlet hole and the water outlet hole, and the center lines of the two holes are consistent; the through holes at both ends in the vertical direction are consistent with the center lines of the through holes on the middle horizontal partition wall W, and intersect with the horizontal center line vertically; the through holes on the horizontal partition wall W are stepped, with a larger diameter at the top and a smaller diameter at the bottom, a cylindrical hole at the top, and an internal threaded hole at the bottom.

[0051] The outer thread with a slightly smaller outer diameter below the outer circle of the valve sleeve 16 is screwed with the inner thread below the through hole on the partition wall W, and the outer circle is assembled with the cylindrical hole above the through hole, and there is a frustum at the lower end; there is a through hole in the center of the valve sleeve 16, and there are two annular grooves in the inner cavity. The two annular grooves have an annular partition wall, and the upper planes of the two annular convex grooves and the annular edges on the lower frustum serve as valve seats for valve ports v3, v2, and v1 respectively; there are a number of notches a on the outer edge of the top end of the valve sleeve 16 for tightening the valve sleeve 16 during assembly. The middle section of the plunger 15 is a cylinder. The small shaft at the upper end is sleeved with a lower pressure plate 14, a diaphragm 13 and an upper pressure plate 4, and a nut 11. The second washer 12 is connected to the plunger 15 as a whole; the small shaft at the lower end is sleeved with a sealing pad seat 18, a sealing pad 17 is arranged in the annular groove above it, and a nut 19 and a third washer 20 are fixed on the lower end surface of the plunger 15; the middle section of the plunger 15 is slidably matched with the through hole of the valve sleeve 16, and serves as a guide hole for the plunger 15 to move up and down. There are three groups of horizontal parallel notches on the cylinder, each group has three equally divided groove-shaped notches, the height of the notches can ensure the smooth flow of the medium, and a guide surface is left between the notches (refer to the attached Figure 2 ), the lower planes of the two groups of notches and the sealing gasket 17 serve as valve flaps of valve ports v3, v2, and v1 respectively, and the distances between the valve seats and valve flaps of each valve port are equal.

[0052] The pressure regulating assembly includes a positioning screw 22 and an O-ring 21. The center of the lower valve cover 25 has a stepped hole that is small at the top and large at the bottom. The large hole is a screw hole, and an O-ring 21 is provided in the small hole. The positioning screw 22 is screwed into the screw hole, and the small shaft above it is dynamically matched with the small hole. The top surface of the small shaft contacts the bottom surface of the small shaft at the lower end of the plunger 15. The axial position of the plunger 15 can be adjusted by rotating the positioning screw 22 to adjust the position of each valve port inside. After the adjustment meets the requirements, it is tightened with the tightening screw 23. The center line of each assembled part is consistent with the vertical center line of the valve body 1.

[0053] The pressure reducing principle and pressure regulating method of this patent are the same as those of ordinary adjustable pressure reducing valves, which are well known to people in the industry and will not be elaborated here. This patent has three groups of valve ports (more valve ports can be added if necessary); under the condition of high pressure reducing ratio, the pressure difference can be evenly distributed to the three groups of valve ports, which can greatly reduce the speed of the medium flowing through the valve ports, preventing the generation of noise, vibration and cavitation. According to the calculation of fluid mechanics, it can be obtained that:

[0054]

[0055] In the formula, V is the flow rate of the medium when it flows through the valve port.

[0056] C-Flow coefficient of valve port

[0057] ΔP-pressure difference across the valve port

[0058] From the above formula, we can know that the flow rate of the medium through the valve port is It is increased by times. After calculation, for three valve ports, the flow rate of the medium flowing through the valve port is 57.79 of the flow rate of the single valve port.

[0059] When the valve body is working normally, the plunger 15 moves up and down in the inner hole of the valve sleeve 16, and there is only one guide hole. Therefore, the present invention can reduce the pressure drop of each valve port and the flow rate of the medium flowing through the valve port, prevent the generation of noise, vibration and cavitation, and avoid the problem of three holes being concentric, thereby reducing the difficulties in processing, assembly and movement of parts; thirdly, the upper and lower ends of the plunger 15 do not need to be guided, thereby simplifying the overall structure and reducing parts.

[0060] The design concept of this patent is also applicable to other valves with high pressure difference, high throttling and three-hole concentric requirements, and the number of valve ports can be increased as needed.

Claims

1. A plunger-type high pressure reduction ratio pressure reducing valve comprises a valve body and a valve sleeve arranged in the valve body, wherein the valve sleeve has a through hole in the center, a plunger is slidably mounted in the through hole, a plurality of annular grooves are arranged on the inner wall of the through hole, and an annular partition wall is arranged between adjacent annular grooves ... plurality of annular grooves are slidably mounted in the through hole, a plurality of annular grooves are slidably mounted in the through hole, a plurality of annular grooves are slidably mounted in the through hole, a plurality of annular grooves are slidably mounted in the through hole, a plurality of annular grooves There are three groups of horizontal parallel notches on the plunger, each group has three equally divided groove-shaped notches, and guide surfaces are left between the groove-shaped notches. The lower planes of the upper two groups of groove-shaped notches and the sealing gaskets installed on the lower side of the plunger serve as valve discs of valve ports v3, v2 and v1 respectively, and the distances between the valve seats and the valve discs of each valve port are equal.

2. The plunger type high pressure reduction ratio pressure reducing valve according to claim 1 is characterized in that: A lower pressing plate, a diaphragm and an upper pressing plate are sleeved on the small shaft at the upper end of the plunger in sequence, and the lower pressing plate, the diaphragm and the upper pressing plate are connected as a whole with the plunger through a nut one and a washer two.

3. The plunger type high pressure reduction ratio pressure reducing valve according to claim 1 is characterized in that: A nut three and a washer three are arranged on the small shaft of the plunger below the sealing pad seat, connecting the sealing pad seat and the plunger into one body, and a sealing pad one is arranged in an annular groove above the sealing seat.

4. The plunger-type high pressure reduction ratio pressure reducing valve according to any one of claims 1 to 3, characterized in that: It also includes a pressure regulating assembly, which includes a positioning screw and an O-ring. A stepped hole with a small top and a large bottom is provided at the center of the lower valve cover. The large hole is a screw hole. An O-ring is provided in the small hole. The small shaft above the positioning screw is movably fitted in the small hole. The positioning screw is screwed into the screw hole. The top surface of the small shaft of the positioning screw abuts against the bottom surface of the small shaft at the lower end of the plunger.

5. The plunger type high pressure reduction ratio pressure reducing valve according to claim 1, characterized in that: A pressure regulating assembly for adjusting the outlet pressure is provided in the upper valve cover. The pressure regulating assembly includes a pressure regulating screw, an upper spring seat and an upper pressure plate. A spring is provided between the upper pressure plate and the spring seat. A screw hole is provided in the center of the spring seat. The screw hole is screwed into the external thread of the pressure regulating screw. A bearing is provided between the top of the pressure regulating screw and the upper valve cover.

6. The plunger type high pressure reduction ratio pressure reducing valve according to claim 1, characterized in that: An upper valve cover and a lower valve cover are respectively arranged on the upper and lower sides of the valve body; a water inlet hole and a water outlet hole are respectively arranged in the horizontal direction of the valve body, a partition wall with a vertical through hole is arranged between the two holes, and the valve sleeve is arranged in the vertical through hole of the partition wall.

7. The plunger type high pressure reduction ratio pressure reducing valve according to claim 1 is characterized in that: An upper end hole and a lower end hole are arranged in the vertical direction of the valve body. The center lines of the upper and lower end holes and the vertical through holes on the partition wall are consistent and intersect vertically with the center lines of the water inlet hole and the water outlet hole.

8. The plunger type high pressure reducing ratio pressure reducing valve according to claim 7, characterized in that: The through hole on the horizontal partition wall is stepped, with a larger diameter at the top and a smaller diameter at the bottom, a cylindrical hole at the top and a threaded hole at the bottom; the external thread with a slightly smaller outer diameter below the outer circle of the valve sleeve is screwed into the internal thread below the through hole on the partition wall.

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