Building water supply pressure reducing valve

Abstract

The application relates to the technical field of pressure reducing valves, in particular to a pressure reducing valve for building water supply, which comprises a pressure reducing valve body, the pressure reducing valve body is used for converting high-pressure water flow into suitable service water pressure and flow, a filtering unit is installed in the water inlet direction of the pressure reducing valve body, the filtering unit is used for filtering impurities in water, preventing the impurities in water from entering the pressure reducing valve and affecting the operation of the pressure reducing valve, an exhaust unit is installed in the water inlet direction of the pressure reducing valve body, and the exhaust unit is used for releasing air bubbles generated after water flow passes through the filtering unit to the outside of the valve body. The filtering unit and the exhaust unit are installed in the water inlet direction of the water supply pressure reducing valve, so that one water supply pressure reducing valve simultaneously realizes the three functions of filtering, exhaust and pressure reduction, so as to solve the problems that multiple accessories need to be installed simultaneously when the existing building installs the water supply pressure reducing valve, the installation steps of the pressure reducing valve are complicated, and the installation cost is high.

Description

Technical Field

[0001] This invention relates to the field of pressure reducing valve technology, specifically a pressure reducing valve for building water supply. Background Technology

[0002] Existing pressure-reducing valves for building water supply are generally used to convert high-pressure water flow into suitable service water pressure and flow rate. According to the "Key Points for Design, Installation, and Maintenance of Pressure-Reducing Valves for Building Water Supply," to prevent construction dust and fine debris, such as putty and gravel, from entering the pressure-reducing valve and affecting the operation of its internal components, a pipeline filter is required before the pressure-reducing valve. According to the "Design Code for Application of Pressure-Reducing Valves in Building Water Supply," because the water flow at the pressure-reducing valve experiences changes in pressure and velocity, cavitation is prone to occur at the valve, reducing its service life. To prevent this, an venting device is generally installed at the bends in the pipeline.

[0003] Therefore, when installing water pressure reducing valves in existing buildings, it is necessary to install pipeline filters and venting devices. This means that the existing construction requires cutting the pipeline into multiple sections and requiring multiple sets of rod guide connection accessories. This installation method results in complicated installation steps and high installation costs for pressure reducing valves.

[0004] Therefore, a pressure reducing valve for building water supply is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a pressure reducing valve for building water supply. By installing a filter unit and an air venting unit on the water inlet of the water supply pressure reducing valve, a single water supply pressure reducing valve can simultaneously perform three functions: filtration, air venting, and pressure reduction, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A pressure reducing valve for building water supply, comprising:

[0008] A pressure reducing valve body, which is used to convert high-pressure water flow into a suitable service water pressure and flow rate;

[0009] Also includes:

[0010] The filter unit is installed on the pipe in the water inlet direction of the pressure reducing valve and on the valve body in the water inlet direction. The filter unit is used to filter out impurities and foreign objects in the water to prevent impurities and foreign objects in the water from entering the pressure reducing valve and affecting its operation. The filter unit is equipped with a foolproof device to prevent the filter element from being missed during installation.

[0011] An exhaust unit is installed in the water inlet direction of the pressure reducing valve body, and the exhaust unit is located between the filter unit and the pressure reducing valve body. The exhaust unit is used to release the air bubbles generated after the water flows through the filter unit to the outside of the valve body.

[0012] Most buildings are equipped with water pressure reducing valves to ensure that each water point receives appropriate service water pressure and flow. Moreover, since the leakage rate and waste of water are almost proportional to the water pressure of the water supply system, pressure reducing valves also have the function of improving operating conditions and potential water saving. According to statistics, the water saving effect is about 30%.

[0013] During building construction and home renovation, a large amount of sand, putty, dust, and other impurities are generated. Some of these impurities enter the pipes during installation and move with the water flow. When they enter the pressure reducing valve, they accumulate inside, causing blockage and affecting the operation of its internal components. Therefore, a pipe filter needs to be installed at the inlet of the pressure reducing valve. When water flows through the filter, air bubbles are easily released by the filter element. When these air bubbles pass through the pressure reducing valve, the significant change in pressure and flow velocity at the valve can cause cavitation, corroding the internal components and reducing the valve's lifespan. Therefore, an venting device is usually installed at pipe bends to release air bubbles from the pipe. Consequently, existing pressure reducing valves require the installation of multiple accessories and the cutting of the pipe into multiple sections for fitting, making the installation process cumbersome.

[0014] The filter unit is equipped with a foolproof device. When the operator replaces the filter element regularly, if the operator removes the old filter element but forgets to install the new one, the foolproof device will prevent the quick-switch device from closing the semi-circular notch, reminding the operator to avoid forgetting to install the filter element. This prevents water from flowing into the pressure reducing valve without being filtered, causing blockage of the pressure reducing valve and affecting the operation of the components inside the valve.

[0015] This invention enables a single water supply pressure reducing valve to simultaneously perform filtration, venting, and pressure reduction functions by installing a filter unit and an venting unit in the water inlet direction. This reduces the installation steps of existing pressure reducing valves, improving installation efficiency. Furthermore, it optimizes existing filters and venting devices, increasing the practicality and convenience of the venting and filter units. Since air bubbles in the water flow are easily released after passing through the filter element, the venting unit is installed between the filter unit and the pressure reducing valve body.

[0016] Preferably, the filtration unit includes a pipe, a filter element, and a quick-switch device for easy replacement of the filter element. The pipe has a semi-circular notch and a groove on its inner side. A magnet for fixing the filter element is installed at the bottom of the groove. One side of the semi-circular notch is flush with the inner wall of the groove near the pressure reducing valve body. The width of the semi-circular notch is greater than the width of the groove. A foolproof device is installed on the side wall of the pipe. The filter element is installed in the groove. A quick-switch device is slidably installed on the outer side wall of the pipe. The filter element is in the shape of a disc.

[0017] Compared to the Y-type filter used in existing water supply pressure reducing valves, this invention uses a disc-shaped filter element. Therefore, a semi-circular notch is made on one side of the pipe for replacing the filter element, and a groove is provided inside the pipe for positioning the filter element. For ease of replacement, the width of the semi-circular notch must be at least 10mm wider than the groove. Since only half of the filter element's sidewall contacts the groove, a magnet is installed on the inner bottom wall of the groove to help fix the filter element in place, preventing it from moving freely within the groove and affecting the filtration effect. One side of the semi-circular notch is flush with the inner wall of the groove near the pressure reducing valve body. This design ensures that when the filter element is filtering, the groove provides complete support, preventing deformation of the filter element under the impact of water flow, which would cause it to lose its filtration effect.

[0018] In a typical Y-type filter, replacing the filter element requires using a wrench to loosen the bolts on the flange cover, opening the flange cover, replacing the filter element, and finally reassembling the flange cover and bolts. This entire process is quite complex, requires specialized tools, and demands a high level of skill from the operator. This invention, however, by installing a quick-closing device above the pipe, allows for quick and convenient opening or closing of the semi-circular notch, enabling filter element replacement without the use of tools, thus significantly improving the efficiency of filter element replacement.

[0019] Preferably, the quick-switching device includes a groove formed on the outer side wall of the pipe, a bushing slidably mounted on the groove, a protrusion on the inner side wall of the bushing that mates with the groove, a sealing ring I for sealing a semi-circular notch installed in the middle of the inner side wall of the bushing, a positioning hole provided at the end of the inner side wall of the bushing near the valve body of the pressure reducing valve, a plurality of movable through holes evenly formed on the side wall of the pipe near the valve body of the pressure reducing valve, a movable groove formed inside the movable through hole, a sealing ring II installed in the movable groove, and a positioning block movably mounted in the movable through hole near the outer side wall of the pipe, the positioning block being fixedly connected to the side wall of the sealing ring II.

[0020] The bushing, which slides on the outer wall of the pipe, is used to open and seal the semicircular notch of the pipe when replacing the filter element. Therefore, a sealing ring is installed on the inner wall of the bushing to enhance its sealing effect. With the cooperation of the protrusion and the slide groove, the bushing can only slide on the pipe and cannot rotate, ensuring that when closed, the positioning hole and positioning block are aligned when the protrusion is at the extreme position of the slide groove near the pressure reducing valve body.

[0021] When the pressure reducing valve is working normally, the water in pipe one will enter the movable groove through the movable through hole under the action of water pressure. The sealing ring two will expand and bend under the action of water pressure. At this time, the sealing ring two will push the positioning block installed in the movable through hole to move away from the axis of pipe one, and finally engage with the positioning hole to achieve the positioning of the bushing. At this time, the bushing cannot slide above the pipe, ensuring the sealing effect of the bushing on the semi-circular notch when the pressure reducing valve is working.

[0022] When the filter needs to be replaced, the valve on the inlet side of the pressure reducing valve is usually closed to cut off the water flow in the pipeline, causing the pressure reducing valve to stop working. At this time, since there is no water pressure in pipeline one, the sealing ring two returns to its initial state and no longer expands or bends. The positioning pin will move towards the axis of pipeline one under the action of the sealing ring two and eventually separate from the positioning hole. At this time, the operator can push the bushing to open it, replace the filter, and then push the bushing to the limit position near the valve body of the pressure reducing valve to seal the semi-circular notch. The valve can then be reopened, and the pressure reducing valve can resume operation.

[0023] Preferably, the foolproof device includes a T-shaped pipe formed on one side wall of the pipe, the horizontal part of the T-shaped pipe communicating with the inner side wall of the groove, a diaphragm installed between the T-shaped pipe and the groove, a trigger rod elastically installed on the horizontal part of the T-shaped pipe, a wedge-shaped notch provided on the trigger rod, and a locking post movably installed on the vertical part of the T-shaped pipe, the end of the locking post near the trigger rod having an inclined surface that cooperates with the wedge-shaped notch.

[0024] When the operator pushes the bushing to its limit position away from the pressure reducing valve body and removes the filter element, the trigger rod will move towards the groove under the action of the spring because there is no horizontal restriction at the groove. It will eventually lift the diaphragm. The diaphragm is used to prevent water in pipe 1 from leaking through the T-shaped pipe. The horizontally moving trigger rod will push the locking pin away from the axis of pipe 1 through the wedge notch and extend a section to the outside of the outer wall of pipe 1. If a new filter element is not installed in the groove at this time, the locking pin will block the bushing when the operator pushes it, making it impossible to push the bushing to the limit position near the pressure reducing valve body.

[0025] After the operator installs the new filter element into the groove, the filter element will push the trigger rod to move closer to the spring. At this time, without the action of the trigger rod, the locking pin will re-enter the T-shaped pipe, and the operator can push the bushing to the limit position close to the pressure reducing valve body.

[0026] Preferably, the exhaust unit includes a second pipe, an exhaust pipe, a float block, a third sealing ring, a guide rod, and a partition. The exhaust pipe consists of an exhaust pipe first and an exhaust pipe second. The second pipe is installed between the first pipe and the pressure reducing valve body. The first exhaust pipe is installed on the outer wall of the second pipe, and the exhaust pipe first is perpendicular to the outer wall of the second pipe. A guide rod is fixedly installed at the end of the second exhaust pipe connected to the first exhaust pipe, and the guide rod is coaxial with the exhaust pipe. A float block is movably installed on the guide rod. The end of the float block away from the partition is conical. A partition is fixedly installed at the end of the first exhaust pipe near the second exhaust pipe. A through hole is opened on the partition. A third sealing ring is installed on the side of the partition near the float block.

[0027] Because air bubbles move in the opposite direction of gravity in water, when air bubbles are generated in pipe two, they enter exhaust pipe one from pipe two, then pass through the baffle into exhaust pipe two, and finally exit to the outside through exhaust pipe two. However, when the pressure reducing valve is in use, pipe two and exhaust pipe one are filled with water, and air bubbles are only generated occasionally. When exhaust pipe one is filled with water, the float will move towards the baffle along the guide rod under the action of the water, and eventually fit tightly with sealing ring three to prevent water in the pipe from leaking out of the exhaust pipe. However, air bubbles in pipe two will still enter exhaust pipe one and accumulate on the side of the baffle where sealing ring three is installed. At the same time, they will squeeze the water in exhaust pipe one towards pipe two. When the accumulated gas pressure is greater than the water pressure, the gas pressure will push the float away from the baffle. At this time, a gap is created between the baffle and the float, and the gas can enter exhaust pipe two through the through hole of the baffle. When the gas pressure decreases, the water pressure is greater than the gas pressure, and the float moves back towards the baffle, forming a seal.

[0028] To prevent air bubbles from being blocked by the bottom of the float block and accumulating at the bottom of the float block instead of on the side of the partition where the sealing ring is installed, thus preventing air bubbles from escaping from the exhaust pipe, the bottom of the float block is made into a cone shape to prevent air bubbles from accumulating.

[0029] The floating block of the present invention is made of a material with a density less than that of water and corrosion resistant, such as rubber, polyolefin and elastomer.

[0030] Preferably, a mechanical seal is used between the second pipe and the first pipe and the pressure reducing valve body. A fixing device is installed on the outer wall of the second pipe to keep the first exhaust pipe always vertical. A level is installed on the outer wall of the second pipe that is perpendicular to the axes of the second pipe and the first exhaust pipe.

[0031] To ensure even stress distribution on the internal components of the pressure-reducing valve, it is typically installed on a horizontal pipe. The valve can be installed 360° along the pipe axis, and the filter unit can also be installed in any direction. However, the venting unit cannot be installed in any direction. Since air bubbles in water always move against gravity, the vent pipe must be installed in the opposite direction to gravity; otherwise, air cannot enter the vent pipe, and the venting unit cannot vent. Therefore, pipe two is rotatably installed between pipe one and the pressure-reducing valve body. After installation, the operator can manually adjust pipe two using a level installed on it to ensure it is vertical. The level has a protective shell on its outer wall. Simultaneously, a mechanical seal is used between pipe two, pipe one, and the pressure-reducing valve body to ensure a tight seal.

[0032] Preferably, the fixing device includes at least one of bolt fixing, wedge block embedding fixing, or unidirectional self-locking fixing using a worm gear.

[0033] After the operator uses a level to rotate exhaust pipe one to a vertically upward direction, pipe two needs to be secured to prevent the pressure reducing valve from rotating on its own during subsequent use, which could lead to exhaust failure. Since the fixing position is arbitrary, it can be secured using the friction between bolts and the pressure reducing valve body. Alternatively, a turbine can be installed on pipe two, and a worm gear can be installed on the pressure reducing valve body. Rotating the worm gear drives the turbine to adjust the direction of exhaust pipe one. Due to the unidirectional self-locking property of the worm gear, pipe two cannot rotate on its own. This method is more expensive and more complex to install than bolt-based friction fixing, but it provides a more secure fixation.

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0035] 1. Install a filter unit and an air venting unit on the water inlet direction of the pressure reducing valve body. The air venting unit is located between the filter unit and the pressure reducing valve body, so that a single pressure reducing valve can simultaneously perform the functions of filtering, air venting and pressure reducing. This avoids the need to install multiple components such as filters and air venting valves simultaneously during the installation of existing pressure reducing valves, reduces the construction difficulty of installing pressure reducing valves, and improves the installation efficiency of pressure reducing valves.

[0036] 2. By using the bushing, sealing ring one, positioning block, sealing ring two, and semi-circular notch, when replacing the filter element, simply push the bushing open manually, remove the old filter element, install the new filter element into pipe one, and then manually close the bushing. This achieves quick opening and closing of the semi-circular notch, allowing operators to replace the filter element without using tools, thus improving the efficiency of filter element replacement.

[0037] 3. The exhaust unit is rotatably installed between the filter unit and the pressure reducing valve body using a mechanical seal. This allows the operator to manually adjust the filter unit using a level after the pressure reducing valve is installed, ensuring the exhaust pipe is vertically upward. The unit is then secured with a fixing device to prevent the exhaust unit from rotating during subsequent use, ensuring it remains operational. Furthermore, because the exhaust unit is adjustable, the pressure reducing valve can be installed in any direction, increasing its versatility. Attached Figure Description

[0038] Figure 1 This is an overall schematic diagram of the bushing in the closed state of the present invention;

[0039] Figure 2 This is an overall schematic diagram of the bushing in the open state of the present invention;

[0040] Figure 3 This is the main view of the off state of the present invention;

[0041] Figure 4 for Figure 3 Enlarged view of a portion of point A in the middle;

[0042] Figure 5 for Figure 3 Enlarged view of a section at point B in the middle;

[0043] Figure 6 This is a top view of the present invention;

[0044] Figure 7 for Figure 6 Enlarged view of a section at point C;

[0045] Figure 8 This is a partial sectional view of the bushing in the open state of the present invention;

[0046] Figure 9 for Figure 8 Enlarged view of a section at point D.

[0047] In the diagram: 1. Pressure reducing valve body; 201. Pipe 1; 2011. Semicircular notch; 202. Pipe 2; 3. Magnet; 4. Filter element; 5. Bushing; 601. Sealing ring 1; 602. Sealing ring 2; 603. Sealing ring 3; 7. Positioning hole; 8. Movable through hole; 9. Movable groove; 10. Positioning block; 11. T-shaped pipe; 12. Diaphragm; 13. Trigger rod; 14. Locking pin; 1501. Exhaust pipe 1; 1502. Exhaust pipe 2; 16. Guide rod; 17. Float block; 18. Baffle plate; 19. Level; 20. Bolt. Detailed Implementation

[0048] The following will be combined with the appendix of the present invention. Figures 1 to 9The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the embodiments of the present invention include, but are not limited to, the embodiments described below. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] Example 1: When pipe 202 is fixed by bolt 20.

[0050] Before using the pressure reducing valve, install the pressure reducing valve on the water supply pipe. After connecting the flanges at both ends of the pressure reducing valve, the operator manually rotates pipe 202. According to the level 19, rotate the exhaust pipe 1501 to a vertically upward position, and then screw in the bolt 20. The friction between the bolt 20 and the valve body 1 of the pressure reducing valve will fix pipe 202.

[0051] When the pressure reducing valve is in use, the water flow first enters pipe 201 and is filtered by the filter element 4 inside pipe 201, blocking impurities and foreign objects in the water. At the same time, the water flow in pipe 201 will enter the movable groove 9 through the movable through hole 8 under the action of water pressure. The sealing ring 602 will expand and bend under the action of water pressure. At this time, the sealing ring 602 will push the positioning block 10, which is movably installed in the movable through hole 8, to move away from the axis of pipe 201 and finally engage with the positioning hole 7 to achieve the positioning of the bushing 5. At this time, the bushing 5 cannot slide above the pipe, ensuring the sealing effect of the bushing 5 on the semi-circular notch 2011 when the pressure reducing valve is working. Then the water will flow into pipe 202, and pipe 202 and exhaust pipe 1501 will be filled with water. When exhaust pipe 1501 is filled with water, the float block 17 will move along the guide rod 16 towards the partition 18 under the action of the water, and finally fit tightly with the sealing ring 3 603 to prevent water in the pipe from leaking from the exhaust pipe. Water flowing through pipe 1 201 easily generates bubbles after passing through filter 4. These bubbles will follow the water flow into pipe 2 202. Since the density of bubbles is less than that of water, bubbles will move in the opposite direction of gravity in water. Therefore, the bubbles in pipe 2 202 will enter exhaust pipe 1 1501 and accumulate on the side of partition 18 where sealing ring 3 603 is installed. When the pressure of the accumulated gas is greater than the water pressure, the gas pressure will push the float 17 away from partition 18 and squeeze the water in exhaust pipe 1 1501 towards pipe 2 202. At this time, a gap is created between partition 18 and float 17, and gas can enter exhaust pipe 2 1502 through the through hole of partition 18 and then be discharged into the outside air from exhaust pipe 2 1502. When the gas pressure decreases, the water pressure is greater than the gas pressure. At this time, float 17 moves back towards partition 18 to form a seal.

[0052] When the water supply valve is closed and filter element 4 is replaced, the sealing ring 602 returns to its initial state due to the lack of water pressure in pipe 201, no longer expanding or bending. The positioning pin moves towards the axis of pipe 201 under the action of the sealing ring 602, eventually separating from the positioning hole 7. At this point, the operator can push the bushing 5 to its limit position away from the pressure reducing valve body 1, exposing the semi-circular notch 2011, and remove the old filter element 4. After the filter element 4 is removed, the trigger rod 13 moves towards the groove under the action of the spring, eventually lifting the diaphragm 12. The horizontally moving trigger rod 13 pushes the locking pin 14 away from the axis of pipe 201 through the wedge-shaped notch, extending a section to the outer wall of pipe 201. At this point, the bushing 5 is blocked by the locking pin 14 and cannot be pushed. When the operator installs the new filter element 4 into pipe 201, the filter element 4 will push the trigger rod 13 to move closer to the spring. At this time, the trigger rod 13 no longer has a function, and the locking pin 14 will re-enter the T-shaped pipe. Then the operator can push the bushing 5 to the limit position close to the valve body 1 of the pressure reducing valve and reopen the valve. The pressure reducing valve can then work again.

[0053] In Example 2, when pipe 202 is fixed using a worm gear, the difference between Example 2 and Example 1 lies in the positioning method of pipe 202. The rest of the operation process is the same as in Example 1, and will not be described in detail here.

[0054] After the pressure reducing valve is installed, the operator manually rotates the worm gear installed on the valve body 1 of the pressure reducing valve. The worm gear drives the turbine fixed on the pipe 202 to rotate. The turbine drives the pipe 202 to rotate synchronously. The operator rotates the exhaust pipe 1501 to a vertically upward position according to the level 19 and then stops rotating the worm gear. At this time, due to the one-way self-locking property of the worm gear, the pipe 202 cannot rotate on its own.

[0055] The fixing method of Embodiment 2 is more expensive and more complicated to install than the fixing method of Embodiment 1, but the fixing method of Embodiment 2 is more stable and can be selected according to the actual situation.

Claims

1. A pressure reducing valve for building water supply, comprising: Pressure reducing valve body (1), the pressure reducing valve body (1) is used to convert high pressure water flow into suitable service water pressure and flow rate; Its characteristic is that it further includes: The filter unit is installed in the water inlet direction of the pressure reducing valve body (1). The filter unit is used to filter out impurities and foreign objects in the water to prevent impurities and foreign objects in the water from entering the pressure reducing valve body (1) and affecting the operation of the pressure reducing valve body (1). The filter unit is equipped with a foolproof device to prevent the filter components from being omitted from installation. The exhaust unit is installed in the water inlet direction of the pressure reducing valve body (1), and the exhaust unit is located between the filter unit and the pressure reducing valve body (1). The exhaust unit is used to release the air bubbles generated after the water flows through the filter unit to the outside of the valve body. The foolproof device includes a T-shaped pipe (11) opened on the side wall of pipe one (201), the horizontal part of the T-shaped pipe (11) is connected to the inner side wall of the groove, a diaphragm (12) is installed between the T-shaped pipe (11) and the groove, a trigger rod (13) is elastically installed on the horizontal part of the T-shaped pipe (11), a wedge-shaped notch is opened on the trigger rod (13), and a locking post (14) is movably installed on the vertical part of the T-shaped pipe (11), and the end of the locking post (14) near the trigger rod (13) is provided with an inclined surface that cooperates with the wedge-shaped notch; The exhaust unit includes a second pipe (202), an exhaust pipe, a float block (17), a third sealing ring (603), a guide rod (16), and a partition plate (18). The exhaust pipe consists of an exhaust pipe first (1501) and an exhaust pipe second (1502). The second pipe (202) is installed between the first pipe (201) and the pressure reducing valve body (1). The exhaust pipe first (1501) is installed on the outer wall of the second pipe (202) and communicates with it internally. The exhaust pipe first (1501) and the outer wall of the second pipe (202) are connected. Vertically, a guide rod (16) is fixedly installed at one end of the exhaust pipe 2 (1502) connected to the exhaust pipe 1 (1501), and the guide rod (16) is coaxial with the exhaust pipe 1 (1501). A floating block (17) is movably installed on the guide rod (16). A partition plate (18) is fixedly installed at one end of the exhaust pipe 1 (1501) near the exhaust pipe 2 (1502). A through hole is opened on the partition plate (18). A sealing ring 3 (603) is installed on the side of the partition plate (18) near the floating block (17). A mechanical seal is used between the second pipe (202) and the first pipe (201) and the pressure reducing valve body (1). A fixing device is installed on the outer wall of the second pipe (202) to keep the first exhaust pipe (1501) always vertical. A level (19) perpendicular to the axis of the second pipe (202) and the first exhaust pipe (1501) is installed on the outer wall of the second pipe (202). The floating block (17) is conical at one end away from the partition (18).

2. A pressure reducing valve for building water supply according to claim 1, characterized in that: The filter unit includes a pipe (201), a filter element (4), and a quick-switch device for easy replacement of the filter element (4). A semi-circular notch (2011) is provided on the pipe (201), and a groove is provided on the inner side of the pipe (201). A magnet (3) for auxiliary fixing of the filter element (4) is installed at the bottom of the groove. The width of the semi-circular notch (2011) is greater than the width of the groove. A foolproof device is installed on the side wall of the pipe (201). The filter element (4) is installed in the groove. A quick-switch device is slidably installed on the outer side wall of the pipe (201).

3. A pressure reducing valve for building water supply according to claim 2, characterized in that: One side of the semi-circular notch (2011) is flush with the inner wall of the groove near the pressure reducing valve body (1).

4. A pressure reducing valve for building water supply according to claim 2, characterized in that: The quick-switching device includes a groove on the outer wall of the first pipe (201), a bushing (5) is slidably installed on the groove, a protrusion that mates with the groove is provided on the inner wall of the bushing (5), a sealing ring (601) for sealing the semi-circular notch (2011) is installed in the middle of the inner wall of the bushing (5), a positioning hole (7) is provided at the end of the inner wall of the bushing (5) near the valve body (1) of the pressure reducing valve, a plurality of movable through holes (8) are evenly opened on the side wall of the first pipe (201) near the valve body (1), a movable groove (9) is opened inside the movable through hole (8), a sealing ring (602) is installed in the movable groove (9), and a positioning block (10) is movably installed in the movable through hole (8) near the outer wall of the first pipe (201).

5. A pressure reducing valve for building water supply according to claim 2, characterized in that: The filter element (4) is in the shape of a disc.

6. A pressure reducing valve for building water supply according to claim 1, characterized in that: The fixing device includes at least one of bolt (20) fixing, wedge block embedding fixing, or unidirectional self-locking fixing using a worm gear.

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