Corrosion-resistant pressure reducing valve

Abstract

The corrosion-resistant pressure reducing valve comprises a valve seat, a valve element, a valve clack and a corrosion-resistant layer, the valve seat is provided with a sliding opening, a water inlet and a water outlet, the outer wall of the valve element is coaxially and fixedly connected with a sliding block, the sliding block is slidably connected to the inner wall of the sliding opening, and the water inlet and the water outlet both communicate with the sliding opening; the sliding block is arranged in the valve seat, the water inlet is arranged between the water outlet and the sliding block, the valve clack is arranged in the water outlet, the valve clack is fixedly connected to the valve element, the valve clack is used for controlling the on-off and the opening degree of the sliding opening and the water outlet, the corrosion-resistant layer comprises a first PTFE coating, and the first PTFE coating is fixedly connected to the inner wall of the valve seat, the outer wall of the valve element and the outer wall of the valve clack. PTFE has excellent corrosion resistance, prevents particles or impurities in a medium from being attached, reduces the probability of clamping stagnation of the valve element, is extremely low in friction coefficient, can reduce frictional wear between the valve element and the valve seat, prolongs the sealing life, and effectively prolongs the service life of the pressure reducing valve.

Description

Technical Field

[0001] The present application relates to the field of pressure reducing valves, and in particular to a corrosion-resistant pressure reducing valve. Background Art

[0002] A pressure reducing valve is an automatic control device used to reduce or stabilize the pressure of a fluid (gas or liquid) system. It is widely used in industrial, civil, and hydraulic systems. By sensing changes in downstream pressure, the valve automatically adjusts the valve opening to reduce high inlet pressure to a stable outlet pressure.

[0003] At present, the valve housings and valve cores of many pressure reducing valves on the market are made of copper alloy materials. Although copper has good thermal conductivity and machinability, it is prone to electrochemical corrosion or chemical erosion when exposed to corrosive media (such as acidic gases, chlorinated water or high-salinity liquids) for a long time, resulting in a decrease in the sealing performance of the valve body, reduced adjustment accuracy, and even leakage, shortening the service life of the pressure reducing valve. Summary of the Invention

[0004] In order to extend the service life of a pressure reducing valve, the present application provides a corrosion-resistant pressure reducing valve.

[0005] The present application provides a corrosion-resistant pressure reducing valve adopting the following technical solution: A corrosion-resistant pressure reducing valve comprises a valve seat, a valve core, a valve disc and a corrosion-resistant layer, the valve seat is provided with a sliding port, a water inlet and a water outlet, the outer wall of the valve core is coaxially fixedly connected with a sliding block, the sliding block is slidingly connected to the inner wall of the sliding port, the water inlet and the water outlet are both connected to the sliding port, the water inlet is arranged between the water outlet and the sliding block, the valve disc is arranged in the water outlet, the valve disc is fixedly connected to the valve core, the valve disc is used to control the on-off and opening degree of the sliding port and the water outlet, the corrosion-resistant layer comprises a first PTFE coating, the first PTFE coating is fixedly connected to the inner wall of the valve seat, the outer wall of the valve core and the outer wall of the valve disc.

[0006] By adopting the above technical solution, PTFE has excellent corrosion resistance, preventing particles or impurities in the medium from adhering, reducing the probability of valve core sticking, and an extremely low friction coefficient, which can reduce the friction and wear between the valve core and the valve seat, extend the sealing life, and effectively extend the service life of the pressure reducing valve.

[0007] Preferably, it also includes a control plate, a valve cover, an adjusting block and a pre-tightening spring, the outer wall of the valve seat is provided with a control groove, the control groove is connected to the end of the sliding port away from the water outlet, the control plate is slidably connected to the groove wall of the control groove, the control plate is fixedly connected to one end of the valve core, the valve seat is provided with a control port, the control port is connected to the water outlet and the control groove, the valve cover is connected to the outer wall of the valve seat, the valve cover is provided with an adjusting port, the adjusting block is threadedly connected to the inner wall of the adjusting port, one end of the pre-tightening spring is connected to the adjusting block, and the other end of the pre-tightening spring is connected to the control plate.

[0008] By adopting the above technical solution, the preload force of the preload spring is adjusted by rotating the adjusting block, thereby adjusting the water pressure at the water outlet, facilitating pressure reduction, and being easy to operate. The preload spring is separated from the medium, reducing the probability of corrosion of the preload spring and extending the service life of the pressure reducing valve.

[0009] Preferably, a sealing member is further included, and the sealing member includes a first sealing ring and a second sealing ring. The outer wall of the control plate is coaxially provided with a first sealing groove, and the outer wall of the sliding block is coaxially provided with a second sealing groove. The first sealing ring is embedded in the first sealing groove, and the outer wall of the first sealing ring abuts the groove wall of the control groove. The second sealing ring is embedded in the second sealing groove, and the outer wall of the second sealing ring abuts the inner wall of the sliding port.

[0010] By adopting the above technical solution, the first sealing ring improves the sealing between the control plate and the control groove wall, reduces the probability of contact between the medium and the preloaded spring, and extends the service life of the pressure reducing valve. The second sealing ring improves the sealing between the sliding block and the inner wall of the sliding port, thereby improving the accuracy of the pressure reducing valve.

[0011] Preferably, the corrosion-resistant layer includes a second PTFE coating, and the second PTFE coating is fixedly connected to the outer wall of the first sealing ring and the outer wall of the second sealing ring.

[0012] By adopting the above technical solution, the PTFE coating can protect the first sealing ring and the second sealing ring, while reducing the friction between the first sealing ring and the wall of the control groove, and reducing the friction between the second sealing ring and the inner wall of the sliding port, making the first sealing ring and the second sealing ring less prone to wear, and effectively extending the service life of the pressure reducing valve.

[0013] Preferably, it also includes a water absorption expansion ring, which is arranged on the outer periphery of the preload spring, and is fixedly connected to the end of the control plate away from the bottom of the control groove, and the water absorption expansion ring abuts the groove wall of the control groove.

[0014] By adopting the above technical solution, if the control plate or the first sealing ring is corroded and damaged, the medium will penetrate from the joint between the control plate and the control groove wall to the side of the control plate away from the valve disc. The water absorption expansion ring is used to absorb water, isolating the medium from the preload spring, reducing the probability of contact between the medium and the preload spring, extending the service life of the preload spring, and extending the service life of the pressure reducing valve.

[0015] Preferably, a sealing member is further included, which includes a ring body, a plug body and an isolation liquid. The outer wall of the water absorption expansion ring is coaxially provided with an annular groove, and the annular groove extends toward one end close to the control board. The sealing member is arranged in the annular groove, and the ring body is fixedly connected to the groove wall of the annular groove facing the control board. The plug body is fixedly connected to the control board. The ring body is provided with an annular cavity, and the isolation liquid is arranged in the annular cavity. The end of the ring body facing the control board is provided with a liquid outlet, and the liquid outlet is connected to the annular cavity, and the plug body is used to seal the liquid outlet.

[0016] By adopting the above technical solution, in the initial state, the plug body blocks the liquid outlet so that the isolation liquid is set in the annular cavity, the control plate or the first sealing ring is corroded and damaged, and the medium penetrates from the joint between the control plate and the control groove wall to the side of the control plate away from the valve disc. The water absorption and expansion ring absorbs water, so that the ring body is away from the plug body, the liquid outlet is opened, and the isolation liquid seeps out and flows to the joint between the control plate and the control groove wall, filling the gap, reducing medium leakage, extending the service life of the preload spring, and extending the service life of the pressure reducing valve.

[0017] Preferably, a warning member is also included, which includes an abutment ring, an abutment rod, a warning ring and a reset spring, one end of the valve cover is provided with a connecting groove, the connecting groove is coaxially arranged with the adjusting port, the diameter of the connecting groove is larger than the diameter of the adjusting port, the groove wall of the connecting groove is threadedly connected to the outer wall of the valve seat, the groove bottom of the connecting groove is provided with a through-hole, the through-hole is arranged at the outer periphery of the adjusting port, the abutment rod is slidably connected to the inner wall of the through-hole, the abutment ring is arranged in the connecting groove, the abutment ring is fixedly connected to one end of the abutment rod, the warning ring is fixedly connected to the other end of the abutment rod, the inner wall of the through-hole is provided with an avoidance port, the outer wall of the abutment rod is fixedly connected with a push block, the push block is slidably connected to the inner wall of the avoidance port, one end of the reset spring abuts the inner wall of the avoidance port, and the other end of the reset spring abuts the push block.

[0018] By adopting the above technical solution, in the initial state, the return spring makes the abutment ring away from the bottom of the connecting groove. When the water absorption expansion ring expands after absorbing water, the water absorption expansion ring abuts against the abutment ring to make the warning ring away from the valve cover, reminding the staff that the control panel is leaking, thereby improving maintenance efficiency and extending the service life of the pressure reducing valve.

[0019] Preferably, it also includes an extrusion plate, which is arranged on the inner circumference of the ring body. The control plate is provided with a sliding groove at one end facing the water absorption expansion ring. One end of the extrusion plate is fixedly connected to a sliding block, and the sliding block is slidably connected and embedded in the sliding groove.

[0020] By adopting the above technical solution, the extrusion plate squeezes the ring body, so that the ring body can discharge liquid, thereby reducing the situation where the ring body cannot discharge liquid due to the low height of the valve cover.

[0021] Preferably, it also includes an extrusion block, which is fixedly connected to one end of the water absorption expansion ring facing the sliding groove. The sliding block is provided with a guide surface away from the bottom of the sliding groove. The distance from the guide surface to the extrusion plate increases as it approaches the bottom of the sliding groove, and the extrusion block abuts the guide surface.

[0022] By adopting the above technical solution, when the water-absorbing expansion ring expands and abuts against the bottom of the connecting groove, the water-absorbing expansion ring is squeezed, and the squeezing block pushes the squeezing plate to move, so that the squeezing plate squeezes the ring body.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. PTFE has excellent corrosion resistance, preventing particles or impurities in the medium from adhering, reducing the probability of valve core sticking, and an extremely low friction coefficient, which can reduce the friction and wear between the valve core and the valve seat, extending the sealing life and effectively extending the service life of the pressure reducing valve; 2. In the initial state, the plug body blocks the liquid outlet so that the isolation liquid is set in the annular cavity. The control board or the first sealing ring is corroded and damaged. The medium penetrates from the joint between the control board and the control groove wall to the side of the control board away from the valve disc. The water-absorbing and expanding ring absorbs water, causing the ring body to move away from the plug body. The liquid outlet opens, and the isolation liquid seeps out and flows to the joint between the control board and the control groove wall, filling the gap, reducing medium leakage, and extending the service life of the preload spring and the pressure reducing valve. 3. In the initial state, the return spring makes the abutment ring away from the bottom of the connecting groove. When the water absorption expansion ring expands after absorbing water, the water absorption expansion ring abuts against the abutment ring, making the warning ring away from the valve cover, reminding the staff that the control panel is leaking, improving maintenance efficiency, and extending the service life of the pressure reducing valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of a corrosion-resistant pressure reducing valve.

[0025] Figure 2 It is a cross-sectional view of a corrosion-resistant pressure reducing valve.

[0026] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0027] Explanation of reference numerals: 1. valve seat; 11. sliding port; 12. water inlet; 13. water outlet; 14. control groove; 15. control port; 2. valve core; 21. sliding block; 211. second sealing groove; 3. valve disc; 4. control plate; 41. first sealing groove; 42. sliding groove; 5. control member; 51. valve cover; 511. connecting groove; 512. regulating port; 513. through-port; 514. avoidance port; 52. regulating block; 53. preload spring; 6. sealing member; 61. first sealing ring; 62. second sealing ring; 7. corrosion-resistant Layer; 71. First PTFE coating; 72. Second PTFE coating; 8. Auxiliary components; 81. Water absorption expansion ring; 811. Ring groove; 82. Sealing member; 821. Ring body; 8211. Ring cavity; 8212. Liquid outlet; 822. Plug body; 823. Isolation liquid; 83. Warning member; 831. Abutment ring; 832. Abutment rod; 8321. Push block; 833. Warning ring; 834. Return spring; 84. Extrusion member; 841. Extrusion plate; 8411. Sliding block; 8412. Guide surface; 842. Extrusion block. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-3 This application is described in further detail.

[0029] The embodiment of the present application discloses a corrosion-resistant pressure reducing valve. Figure 1 and Figure 2 The corrosion-resistant pressure reducing valve includes a valve seat 1, a valve core 2, a valve disc 3, a control plate 4, a control part 5, a sealing part 6, a corrosion-resistant layer 7 and an auxiliary component 8.

[0030] Reference Figure 2 The valve seat 1 is provided with a sliding port 11, a water inlet 12 and a water outlet 13. The valve core 2 is arranged in the sliding port 11. The outer wall of the valve core 2 is coaxially fixedly connected with a sliding block 21. The sliding block 21 is slidingly connected to the inner wall of the sliding port 11. The water inlet 12 and the water outlet 13 are both connected to the sliding port 11. The water inlet 12 is arranged between the water outlet 13 and the sliding block 21. The valve flap 3 is arranged in the water outlet 13. The valve flap 3 is fixedly connected to the valve core 2. The valve flap 3 is used to control the on-off and opening degree of the sliding port 11 and the water outlet 13.

[0031] The outer wall of the valve seat 1 is provided with a control groove 14, which is connected to the end of the sliding port 11 away from the water outlet 13. The control groove 14 and the sliding port 11 are arranged coaxially. The control plate 4 is slidably connected to the groove wall of the control groove 14, and the control plate 4 is fixedly connected to the end of the valve core 2 away from the valve disc 3. The valve seat 1 is provided with a control port 15, which is connected to the water outlet 13 and the control groove 14.

[0032] Reference Figure 2The control component 5 includes a valve cover 51, an adjusting block 52, and a preload spring 53. A connecting groove 511 is coaxially provided at one end of the valve cover 51. An adjusting port 512 is coaxially provided at the valve cover 51. The adjusting port 512 passes through the valve cover 51. The diameter of the connecting groove 511 is larger than the diameter of the adjusting port 512. The groove wall of the connecting groove 511 is threadedly connected to the outer wall of the valve seat 1. The connecting groove 511 is connected to the control groove 14. The adjusting block 52 is threadedly connected to the inner wall of the adjusting port 512. One end of the preload spring 53 is connected to the adjusting block 52, and the other end of the preload spring 53 is connected to the control plate 4.

[0033] The sealing member 6 includes a first sealing ring 61 and a second sealing ring 62. The outer wall of the control panel 4 is coaxially provided with a first sealing groove 41, and the outer wall of the sliding block 21 is coaxially provided with a second sealing groove 211. The first sealing ring 61 is embedded in the first sealing groove 41, and the outer wall of the first sealing ring 61 abuts the groove wall of the control groove 14. The second sealing ring 62 is embedded in the second sealing groove 211, and the outer wall of the second sealing ring 62 abuts the inner wall of the sliding port 11.

[0034] Reference Figure 2 The corrosion-resistant layer 7 includes a first PTFE coating 71 and a second PTFE coating 72. The first PTFE coating 71 is fixedly connected to the inner wall of the valve seat 1, the outer wall of the valve core 2, the outer wall of the valve disc 3, and the outer wall of the control plate 4. The second PTFE coating 72 is fixedly connected to the outer wall of the first sealing ring 61 and the outer wall of the second sealing ring 62.

[0035] Reference Figure 2 and Figure 3 The auxiliary component 8 includes a water absorption expansion ring 81, a sealing member 82, a warning member 83 and an extrusion member 84. The sealing member 82 includes a ring body 821, a plug body 822 and an isolation liquid 823. The warning member 83 includes an abutment ring 831, an abutment rod 832, a warning ring 833 and a return spring 834. The extrusion member 84 includes an extrusion plate 841 and an extrusion block 842.

[0036] The water-absorbing expansion ring 81 is disposed on the outer periphery of the preload spring 53 and is fixedly connected to the end of the control board 4 facing away from the bottom of the control groove 14. The outer wall of the water-absorbing expansion ring 81 abuts the wall of the control groove 14. The outer wall of the water-absorbing expansion ring 81 is coaxially defined with an annular groove 811, which extends toward the end closest to the control board 4. A sealing member 82 is disposed within the annular groove 811. A ring body 821 is fixedly connected to the wall of the annular groove 811 facing the control board 4. A plug 822 is fixedly connected to the control board 4. The ring body 821 defines an annular cavity 8211, within which an isolation fluid 823 is disposed. A liquid outlet 8212 is defined on the end of the ring body 821 facing the control board 4. The liquid outlet 8212 communicates with the annular cavity 8211 and is located near the edge of the control board 4. The plug 822 is used to seal the liquid outlet 8212. There are multiple liquid outlets 8212, which are evenly spaced around the axis of the annular groove 811. There are multiple plug bodies 822, which are arranged one-to-one corresponding to the liquid outlets 8212. The isolation liquid 823 is glycerin or silicone oil.

[0037] Reference Figure 2 The bottom of the connecting groove 511 is provided with a through-hole 513, and the through-hole 513 is provided on the outer periphery of the adjusting port 512. The abutment rod 832 is slidably connected to the inner wall of the through-hole 513. The abutment ring 831 is provided in the connecting groove 511, and the abutment ring 831 is fixedly connected to one end of the abutment rod 832. The warning ring 833 is fixedly connected to the other end of the abutment rod 832. There are multiple through-holes 513, and the multiple through-holes 513 are evenly spaced around the axis of the adjusting port 512. There are multiple abutment rods 832, and the abutment rods 832 are arranged one-to-one corresponding to the through-holes 513.

[0038] The inner wall of the through opening 513 is provided with an avoidance opening 514, and the outer wall of the abutting rod 832 is fixedly connected with a push block 8321, and the push block 8321 is slidably connected to the inner wall of the avoidance opening 514. One end of the return spring 834 abuts the avoidance opening 514 toward the inner wall of the control panel 4, and the other end of the return spring 834 abuts the push block 8321.

[0039] Reference Figure 2 and Figure 3 The extrusion plate 841 is disposed on the inner circumference of the ring body 821. The end of the control plate 4 facing the water-expandable ring 81 is provided with a sliding groove 42. There are multiple sliding grooves 42, evenly spaced around the axis of the connecting groove 511. A sliding block 8411 is fixedly connected to one end of the extrusion plate 841, which slides into and fits within the sliding groove 42. The extrusion block 842 is fixedly connected to the end of the water-expandable ring 81 facing the sliding groove 42. A guide surface 8412 is provided on the sliding block 8411, facing away from the bottom of the sliding groove 42. The distance between the guide surface 8412 and the extrusion plate 841 increases as it approaches the bottom of the sliding groove 42, and the extrusion block 842 abuts the guide surface 8412.

[0040] The implementation principle of a corrosion-resistant pressure reducing valve in an embodiment of the present application is as follows: PTFE has excellent corrosion resistance, prevents particles or impurities in the medium from adhering, and extends the sealing life. If the control panel 4 or the first 71 sealing ring 61 is corroded and damaged, the medium penetrates from the joint between the control panel 4 and the wall of the control groove 14 to the side of the control panel 4 away from the valve disc 3. The water absorption expansion ring 81 is used to absorb water, so that the ring body 821 is away from the plug body 822. The liquid outlet is opened, and the isolation liquid 823 seeps out and flows to the joint between the control panel 4 and the wall of the control groove 14 to fill the gap. When the water absorption expansion ring 81 abuts the abutting ring 831, the warning ring 833 is away from the valve cover 51, reminding the staff that the control panel 4 is leaking. The water absorption expansion ring 81 is squeezed, and the squeezing block 842 pushes the squeezing plate 841 to move, so that the squeezing plate 841 squeezes the ring body 821 to assist in liquid discharge.

[0041] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A corrosion-resistant pressure reducing valve, characterized in that: The invention comprises a valve seat (1), a valve core (2), a valve disc (3) and a corrosion-resistant layer (7), wherein the valve seat (1) is provided with a sliding port (11), a water inlet (12) and a water outlet (13), the outer wall of the valve core (2) is coaxially fixedly connected with a sliding block (21), the sliding block (21) is slidably connected to the inner wall of the sliding port (11), the water inlet (12) and the water outlet (13) are both connected to the sliding port (11), the water inlet (12) is provided at the water outlet (13) and the sliding block (21), the valve flap (3) is arranged in the water outlet (13), the valve flap (3) is fixedly connected to the valve core (2), the valve flap (3) is used to control the on-off and opening degree of the sliding port (11) and the water outlet (13), the corrosion-resistant layer (7) includes a first PTFE coating (71), and the first PTFE coating (71) is fixedly connected to the inner wall of the valve seat (1), the outer wall of the valve core (2) and the outer wall of the valve flap (3).

2. The corrosion-resistant pressure reducing valve according to claim 1, characterized in that: The valve seat (1) further comprises a control plate (4), a valve cover (51), an adjusting block (52) and a preload spring (53); the outer wall of the valve seat (1) is provided with a control groove (14); the control groove (14) is connected to one end of the sliding port (11) away from the water outlet (13); the control plate (4) is slidably connected to the groove wall of the control groove (14); the control plate (4) is fixedly connected to one end of the valve core (2); the valve seat (1) is provided with a control port (15); the control port (15) is connected to the water outlet (13) and the control groove (14); the valve cover (51) is connected to the outer wall of the valve seat (1); the valve cover (51) is provided with an adjusting port (512); the adjusting block (52) is threadedly connected to the inner wall of the adjusting port (512); one end of the preload spring (53) is connected to the adjusting block (52); and the other end of the preload spring (53) is connected to the control plate (4).

3. The corrosion-resistant pressure reducing valve according to claim 2, characterized in that: The invention also includes a sealing member (6), wherein the sealing member (6) includes a first sealing ring (61) and a second sealing ring (62); the outer wall of the control plate (4) is coaxially provided with a first sealing groove (41); the outer wall of the sliding block (21) is coaxially provided with a second sealing groove (211); the first sealing ring (61) is embedded in the first sealing groove (41); the outer wall of the first sealing ring (61) abuts against the groove wall of the control groove (14); the second sealing ring (62) is embedded in the second sealing groove (211); the outer wall of the second sealing ring (62) abuts against the inner wall of the sliding opening (11).

4. The corrosion-resistant pressure reducing valve according to claim 3, characterized in that: The corrosion-resistant layer (7) includes a second PTFE coating (72), and the second PTFE coating (72) is fixedly connected to the outer wall of the first sealing ring (61) and the outer wall of the second sealing ring (62).

5. The corrosion-resistant pressure reducing valve according to claim 3, characterized in that: It also includes a water absorption expansion ring (81), which is arranged on the outer periphery of the preload spring (53), and is fixedly connected to an end of the control plate (4) away from the bottom of the control groove (14), and the water absorption expansion ring (81) abuts against the groove wall of the control groove (14).

6. The corrosion-resistant pressure reducing valve according to claim 5, characterized in that: The device further comprises a blocking member (82), the blocking member (82) comprising a ring body (821), a plug body (822) and an isolation liquid (823); an outer wall of the water absorption expansion ring (81) is coaxially provided with an annular groove (811); the annular groove (811) extends toward one end close to the control board (4); the blocking member (82) is disposed in the annular groove (811); the ring body (821) is fixedly connected to the groove wall of the annular groove (811) facing the control board (4); the plug body (822) is fixedly connected to the control board (4); the ring body (821) is provided with an annular cavity (8211); the isolation liquid (823) is disposed in the annular cavity (8211); an end of the ring body (821) facing the control board (4) is provided with a liquid outlet (8212); the liquid outlet (8212) is connected to the annular cavity (8211); and the plug body (822) is used to block the liquid outlet (8212).

7. The corrosion-resistant pressure reducing valve according to claim 6, characterized in that: The valve cover (51) further comprises a warning member (83), wherein the warning member (83) comprises an abutting ring (831), an abutting rod (832), a warning ring (833) and a return spring (834); a connecting groove (511) is provided at one end of the valve cover (51); the connecting groove (511) is coaxially arranged with the regulating port (512); the diameter of the connecting groove (511) is larger than the diameter of the regulating port (512); the groove wall of the connecting groove (511) is threadedly connected to the outer wall of the valve seat (1); the groove bottom of the connecting groove (511) is provided with a through-hole (513); the through-hole (513) is arranged on the outer periphery of the regulating port (512); the abutting rod (832) is slidably connected to the regulating port (512); On the inner wall of the through-hole (513), the abutting ring (831) is arranged in the connecting groove (511), the abutting ring (831) is fixedly connected to one end of the abutting rod (832), the warning ring (833) is fixedly connected to the other end of the abutting rod (832), the inner wall of the through-hole (513) is provided with an avoidance opening (514), the outer wall of the abutting rod (832) is fixedly connected to a push block (8321), the push block (8321) is slidably connected to the inner wall of the avoidance opening (514), one end of the return spring (834) abuts the inner wall of the avoidance opening (514), and the other end of the return spring (834) abuts the push block (8321).

8. The corrosion-resistant pressure reducing valve according to claim 7, characterized in that: The invention also includes an extrusion plate (841), the extrusion plate (841) being arranged on the inner periphery of the ring body (821), the control plate (4) being provided with a sliding groove (42) at one end facing the water absorption expansion ring (81), and a sliding block (8411) being fixedly connected to one end of the extrusion plate (841), and the sliding block (8411) being slidably connected and embedded in the sliding groove (42).

9. The corrosion-resistant pressure reducing valve according to claim 8, characterized in that: The extrusion plate (841) further comprises an extrusion block (842), wherein the extrusion block (842) is fixedly connected to one end of the water absorption expansion ring (81) facing the sliding groove (42), and the sliding block (8411) is provided with a guide surface (8412) away from the bottom of the sliding groove (42), and the distance between the guide surface (8412) and the extrusion plate (841) increases as it approaches the bottom of the sliding groove (42), and the extrusion block (842) abuts against the guide surface (8412).

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