Piston combination pressure reducing valve with back flushing function

Abstract

The utility model provides a piston combination formula pressure reducing valve with back flush function relates to pressure reducing valve technical field, including valve seat, valve rod and blowdown passageway, the left part of valve seat is provided with the import, and the right part of valve seat is provided with the export, and the inside middle part of valve seat is provided with the valve port, the lower part of valve seat middle part is provided with the blowdown pipe mouth, and the blowdown pipe mouth lower assembly has the blowdown passageway, the right side of blowdown passageway is provided with the side pass pipe, and is linked together and is provided with between blowdown passageway and side pass pipe, the upper part of valve seat is provided with the valve cover, and the middle part of valve cover is installed with valve rod, the upper part of blowdown passageway is provided with the outer connecting hoop, and the outer connecting hoop is through the thread twist and is combined in the blowdown pipe mouth outside, is provided with the first connecting hole in the blowdown pipe mouth. The utility model is convenient when back flush, and the back flush waste liquid is discharged alone, and the combination installation or split is convenient, and the structure is safe and compact and reliable, avoids the leakage, and is safer, more efficient and practical.

Description

Technical Field

[0001] This utility model relates to the field of pressure reducing valve technology, specifically to a piston combination pressure reducing valve with backflushing function. Background Technology

[0002] A pressure reducing valve is a valve that reduces the inlet pressure to a desired outlet pressure by adjusting the pressure, and automatically maintains a stable outlet pressure by relying on the energy of the medium itself. From a fluid mechanics perspective, a pressure reducing valve is a throttling element with variable local resistance. That is, by changing the throttling area, the flow velocity and kinetic energy of the fluid are altered, resulting in different pressure losses, thereby achieving pressure reduction. Then, through the regulation of the control and adjustment system, the fluctuations in the downstream pressure are balanced with the spring force, keeping the downstream pressure constant within a certain error range. Pressure reducing valves often have filter components attached to remove impurities from the internal fluid. However, while these filter components can filter impurities, these filtered impurities are not easily removed. Furthermore, over prolonged use, the filter components are prone to clogging by impurities, affecting the filtration effect and service life. A pressure reducing valve is a specialized device that automatically reduces the working pressure of a pipeline. It can reduce the high water pressure upstream of the valve to the required level downstream. Pressure reducing valves are widely used in high-rise buildings, areas with excessively high water pressure in urban water supply networks, mines, and other applications to ensure that each water point in the water supply system receives appropriate service water pressure and flow. Given that the leakage rate and waste of water are almost directly proportional to the water pressure of the water supply system, pressure reducing valves can improve system operating conditions and have potential water-saving effects. According to statistics, their water-saving effect is about 30%.

[0003] In the specification of a filter pressure reducing valve with backwashing function in the prior art (publication number CN213479199U), it is mentioned that "a pressure plate is provided above the adjusting spring and slidably connected to the valve body, and a threaded rod is provided above the pressure plate and threadedly connected to the valve body; a diaphragm is fixedly connected to the valve body below the adjusting spring, a connecting block is slidably connected to the valve body below the diaphragm, and a piston is fixedly connected below the connecting block; a transition chamber is provided below the valve body cavity corresponding to the position of the piston, an annular filter screen is provided in the transition chamber, a push rod is provided below the transition chamber and slidably connected to the valve body, and reset rods are provided on both sides of the push rod and slidably connected to the valve body." However, the push block and the drain port in the prior art are not tightly connected, which easily leads to leakage when backwashing is not performed, making it unsafe and unreliable to use. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, a piston combination pressure reducing valve with backflushing function is provided to solve the problem that the push block and the drain port are not tightly connected in existing technologies, which easily leads to leakage when backflushing is not performed, and the use is not safe, tight and reliable.

[0005] To achieve the above objectives, a piston-type pressure reducing valve with backflushing function is provided, comprising a valve seat, a valve stem, and a drain channel. The valve seat has an inlet on the left and an outlet on the right. A valve port is located in the center of the valve seat. A drain pipe port is located in the center of the lower part of the valve seat, and a drain channel is assembled below the drain pipe port. A side pipe is located on the right side of the drain channel, and the drain channel and the side pipe are connected. A valve cover is located on the upper part of the valve seat, and a valve stem is installed in the center of the valve cover.

[0006] Furthermore, the upper side of the valve seat is provided with a pressure port, and a cylinder liner is installed inside the pressure port. A sealing gasket is placed inside the cylinder liner, and the sealing gasket is made of rubber.

[0007] Furthermore, an adjusting handle is fixed to the upper end of the valve stem, and an upper pressure plate is fixed to the upper part of the valve stem. A spring is pressed under the upper pressure plate, and the spring is sleeved outside the middle part of the valve stem. A fixing block is fixed to the lower end of the valve stem.

[0008] Furthermore, a middle pressure block is fixed to the lower end of the fixed block, a piston is fixed to the lower end of the middle pressure block, and a central through hole is provided on the lower side of the piston. Side openings are provided on both the left and right sides of the central through hole, and a lower plug is provided in the middle of the central through hole.

[0009] Furthermore, the upper part of the sewage discharge channel is provided with an outer connecting clamp, which is screwed onto the outside of the sewage discharge pipe opening by threads. The sewage discharge pipe opening is provided with a first connecting hole, and the outer side of the sewage discharge pipe opening is provided with a lower sleeve. The lower part of the sewage discharge channel is provided with a lower sleeve plate, and a threaded rod is movably connected to the middle of the lower sleeve plate.

[0010] Furthermore, a turntable is provided at the lower end of the threaded rod, and the upper end of the threaded rod is fixed inside the lower plug head. The lower plug head is made of silicone rubber, and the lower plug head and the threaded rod are arranged to move up and down in the sewage channel.

[0011] The beneficial effects of this utility model are as follows:

[0012] 1. The sealing gasket and cylinder liner in this utility model are designed to ensure a tight seal between the valve seat and the valve cover, making it safer and more reliable to use.

[0013] 2. The upper pressure plate and spring in this utility model provide a straight buffering effect, preventing damage to the valve port due to excessive pressure. Furthermore, the lower part of the central through hole on the lower side of the piston is embedded in the drain pipe. When the valve port is closed for backwashing, the flushing water enters the lower space inside the valve seat through the outlet and enters the lower plug through the side opening, making it convenient for the backwashing waste liquid to be transported to the drain channel for discharge, which is more convenient and time-saving.

[0014] 3. In this utility model, when the turntable and threaded rod are rotated clockwise, the threaded rod moves downwards while rotating until the lower plug head moves from the lower part of the drain pipe opening to the lower part of the drain channel, facilitating the backwash waste liquid to be transported out through the drain channel and side pipe. After backwashing is completed, the threaded rod is rotated clockwise, causing the threaded rod and lower plug head to move straight upwards until the lower plug head blocks the lower part of the drain pipe opening, achieving a tight seal, making it more convenient and practical. Attached Figure Description

[0015] Figure 1 This is a cross-sectional schematic diagram of an embodiment of the present utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of the valve seat according to an embodiment of the present utility model;

[0017] Figure 3 This is a schematic diagram of the valve stem structure according to an embodiment of the present utility model;

[0018] Figure 4 This is a schematic diagram of the internal structure of the sewage channel in an embodiment of this utility model.

[0019] In the diagram: 1. Valve seat; 10. Lower pressure port; 11. Sealing gasket; 12. Cylinder liner; 13. Valve cover; 14. Inlet; 15. Valve port; 16. Outlet; 17. Drain pipe port; 18. Lower sleeve port; 19. First connecting hole; 2. Valve stem; 20. Adjusting handle; 21. Upper pressure plate; 22. Lower plug; 23. Spring; 24. Fixing block; 25. Middle pressure block; 26. Piston; 27. Side opening; 28. Central through hole; 3. Drain channel; 30. External connecting clamp; 31. Lower plug; 32. Side through pipe; 33. Lower sleeve plate; 34. Threaded rod; 35. Turntable. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. The specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Specific details, such as particular system structures and technologies, are provided to facilitate a more thorough understanding of the embodiments of the present utility model. The described embodiments are some, but not all, of the embodiments disclosed herein. However, those skilled in the art should understand that the present utility model can also be implemented in other embodiments without these specific details. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0021] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0022] Figure 1 This is a cross-sectional schematic diagram of an embodiment of the present utility model. Figure 2 This is a schematic diagram of the internal structure of the valve seat according to an embodiment of the present utility model. Figure 3 This is a schematic diagram of the valve stem structure according to an embodiment of the present utility model. Figure 4 This is a schematic diagram of the internal structure of the sewage channel in an embodiment of this utility model.

[0023] Reference Figures 1 to 4 As shown, this utility model provides a piston combination pressure reducing valve with backflushing function, including valve seat 1, valve stem 2 and drain channel 3. The valve seat 1 has an inlet 14 on the left and an outlet 16 on the right. The valve seat 1 has a valve port 15 in the middle. The valve seat 1 has a drain pipe port 17 in the middle of the lower part. The drain channel 3 is assembled below the drain pipe port 17. The drain channel 3 has a side pipe 32 on the right side. The drain channel 3 and the side pipe 32 are connected. The valve seat 1 has a valve cover 13 on the upper part. The valve stem 2 is installed in the middle of the valve cover 13.

[0024] In this embodiment, a pressure port 10 is provided on the upper side of the valve seat 1, and a cylinder liner 12 is installed inside the pressure port 10. A sealing gasket 11 is fitted inside the cylinder liner 12, and the sealing gasket 11 is made of rubber.

[0025] As a preferred embodiment, the sealing gasket 11 and cylinder liner 12 in this utility model are designed to ensure a tight seal between the valve seat 1 and the valve cover 13, making the use safer and more reliable.

[0026] In this embodiment, an adjusting handle 20 is fixed to the upper end of the valve stem 2, and an upper pressure plate 21 is fixed to the upper part of the valve stem 2. A spring 23 is pressed down by the upper pressure plate 21. The spring 23 is sleeved outside the middle part of the valve stem 2, and a fixing block 24 is fixed to the lower end of the valve stem 2. A middle pressure block 25 is fixed to the lower end of the fixing block 24, and a piston 26 is fixed to the lower end of the middle pressure block 25. A central through hole 28 is provided on the lower side of the piston 26. Side openings 27 are provided on both the left and right sides of the central through hole 28, and a lower plug 22 is provided in the middle of the central through hole 28.

[0027] As a preferred embodiment, the upper pressure plate 21 and spring 23 in this utility model provide a straight buffering effect, preventing damage to the valve port due to excessive pressure. Furthermore, the lower part of the central through hole 28 provided on the lower side of the piston 26 is embedded in the drain pipe port 17. When the valve port is closed for backwashing, the flushing water enters the lower space inside the valve seat 1 through the outlet 16, and enters the lower plug head 22 through the side opening 27. This facilitates the backwashing waste liquid to be transported through the lower plug head 22 to the drain channel 3 for discharge, making it more convenient and labor-saving.

[0028] In this embodiment, an outer connecting clamp 30 is provided at the upper part of the sewage channel 3, and the outer connecting clamp 30 is screwed onto the outside of the sewage pipe opening 17. A first connecting hole 19 is provided inside the sewage pipe opening 17, and a lower sleeve opening 18 is provided on the outer side of the sewage pipe opening 17. A lower sleeve plate 33 is provided at the lower part of the sewage channel 3, and a threaded rod 34 is movably connected to the middle of the lower sleeve plate 33. A turntable 35 is provided at the lower end of the threaded rod 34, and the upper end of the threaded rod 34 is fixed inside the lower plug head 31. The lower plug head 31 is made of silicone rubber, and the lower plug head 31 and the threaded rod 34 are arranged to move up and down inside the sewage channel 3.

[0029] In a preferred embodiment, when the turntable 35 and threaded rod 34 are rotated clockwise, the threaded rod 34 moves downwards while rotating until the lower plug 31 moves from the lower part of the drain pipe 17 to the lower part of the drain channel 3, facilitating the backwash waste liquid to be transported out through the drain channel 3 and the side pipe 32. After the backwash is completed, the threaded rod 34 is rotated clockwise, causing the threaded rod 34 and the lower plug 31 to move straight upwards until the lower plug 31 blocks the lower part of the drain pipe 17, achieving a tight blockage, which is more convenient and practical.

[0030] This invention effectively solves the problem that the push block and the drain outlet are not tightly connected in the prior art, which easily leads to leakage when backwashing is not performed, and is not safe and reliable in use. This invention is convenient and easy to use during backwashing, allows for separate discharge of backwash waste liquid, facilitates assembly or disassembly, and has a safe, tight and reliable structure to prevent leakage, making it safer, more efficient and practical.

[0031] The above embodiments are used to explain and illustrate the present utility model, and not to limit the utility model. Any modifications and changes made to the present utility model within the spirit and scope of the claims should be included within the protection scope of the present utility model.

Claims

1. A piston-type pressure reducing valve with backflushing function, characterized in that: The valve includes a valve seat (1), a valve stem (2), and a drain channel (3). The valve seat (1) has an inlet (14) on the left and an outlet (16) on the right. The valve seat (1) has a valve port (15) in the middle. The valve seat (1) has a drain pipe port (17) in the middle of the lower part. The drain channel (3) is assembled below the drain pipe port (17). The drain channel (3) has a side pipe (32) on the right side. The drain channel (3) and the side pipe (32) are connected. The valve seat (1) has a valve cover (13) on the upper part. The valve stem (2) is installed in the middle of the valve cover (13).

2. The piston-combination pressure reducing valve with backflushing function according to claim 1, characterized in that, The valve seat (1) is provided with a pressure port (10) on its upper side, and a cylinder liner (12) is installed inside the pressure port (10), and a sealing gasket (11) is placed inside the cylinder liner (12), and the sealing gasket (11) is made of rubber.

3. A piston-type pressure reducing valve with backflushing function according to claim 1, characterized in that, An adjusting handle (20) is fixed to the upper end of the valve stem (2), and an upper pressure plate (21) is fixed to the upper part of the valve stem (2). A spring (23) is pressed down by the upper pressure plate (21). The spring (23) is sleeved outside the middle part of the valve stem (2), and a fixing block (24) is fixed to the lower end of the valve stem (2).

4. A piston-combination pressure reducing valve with backflushing function according to claim 3, characterized in that, The lower end of the fixed block (24) is fixed with a middle pressure block (25), the lower end of the middle pressure block (25) is fixed with a piston (26), and the lower side of the piston (26) is provided with a central through hole (28). The left and right sides of the central through hole (28) are provided with side openings (27), and the middle part of the central through hole (28) is provided with a lower plug (22).

5. A piston-combination pressure reducing valve with backflushing function according to claim 1, characterized in that, The upper part of the sewage channel (3) is provided with an outer connecting hoop (30), and the outer connecting hoop (30) is screwed onto the outside of the sewage pipe opening (17) by threads. The sewage pipe opening (17) is provided with a first connecting hole (19), the outside of the sewage pipe opening (17) is provided with a lower sleeve opening (18), and the lower part of the sewage channel (3) is provided with a lower sleeve plate (33), and a threaded rod (34) is movably connected to the middle of the lower sleeve plate (33).

6. A piston-combination pressure reducing valve with backflushing function according to claim 5, characterized in that, The lower end of the threaded rod (34) is provided with a turntable (35), and the upper end of the threaded rod (34) is fixed in the lower plug head (31). The lower plug head (31) is made of silicone rubber, and the lower plug head (31) and the threaded rod (34) are arranged to move up and down in the sewage channel (3).

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