CN217977558U - Differential pressure control check valve for water supply treatment system - Google Patents
Differential pressure control check valve for water supply treatment system Download PDFInfo
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- CN217977558U CN217977558U CN202222008755.9U CN202222008755U CN217977558U CN 217977558 U CN217977558 U CN 217977558U CN 202222008755 U CN202222008755 U CN 202222008755U CN 217977558 U CN217977558 U CN 217977558U
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Abstract
The utility model discloses a differential pressure control check valve for a water supply treatment system, which comprises a valve body; the valve body is of a hollow tubular structure, and the embedded cylindrical barrel is concentrically arranged in the valve body; the pressure regulating and controlling assembly is arranged in the valve body and comprises a sliding rail fixing base; the sliding rail fixing base is concentrically fixed in the valve body and is arranged close to the outlet end of the valve body; the sliding rail fixing top seat is concentrically fixed in the embedded cylindrical barrel and is arranged close to the inlet end of the valve body; one end of the sliding rail is vertically fixed with the sliding rail fixing base, and the other end of the sliding rail is vertically fixed with the sliding rail fixing top seat; the flow baffle is concentrically arranged in the valve body and is sleeved on the sliding rail in a sliding manner; a liquid flow channel is arranged between the periphery of the flow baffle and the inner wall of the valve body, and the side surface of the flow baffle can be connected with the end part of the embedded cylindrical barrel in a sealing way; the utility model discloses satisfy under the condition of flow and pressure abrupt change, keep off and flow the quick closed runner of board to prevent the downstream fluid against the current, realize the guard action to upstream equipment or instrument.
Description
Technical Field
The utility model belongs to the technical field of the valve, in particular to a pressure differential control check valve for feedwater treatment system.
Background
At present, different types of check valves are commonly used in a feedwater treatment system in a thermal power plant, and the check valves are generally used as accessories of a pipeline for opening and closing, controlling flow direction, adjusting and controlling conveying fluid, and mainly used for preventing upstream equipment and instruments from being damaged due to fluid backflow or backflow caused by sudden upstream pressure reduction or downstream pressure increase.
In the actual use process, due to the corrosion product migration in the pipeline and the corrosion action of the bacteria breeding fluid on the valve body, the pollution and blockage phenomenon can occur in the long-time use process, usually, the check valve is not closed tightly, the fluid flows reversely, and the use safety and reliability of upstream equipment and instruments are seriously affected.
SUMMERY OF THE UTILITY MODEL
To the technical problem who exists among the prior art, the utility model provides a pressure differential control check valve for feedwater treatment system has avoided current check valve to close not tight, causes the technical problem of fluid countercurrent.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
the utility model provides a differential pressure control check valve for a water supply treatment system, which comprises a valve body, a pressure regulating and controlling component and an embedded cylinder; the valve body is of a hollow tubular structure, and the embedded cylindrical barrel is concentrically arranged in the valve body; one end of the embedded cylindrical barrel is flush with the inlet end of the valve body, and the other end of the embedded cylindrical barrel extends towards the middle of the valve body;
the pressure regulating and controlling assembly is arranged in the valve body and comprises a sliding rail fixing base, a flow baffle, a sliding rail and a sliding rail fixing top seat; the sliding rail fixing base, the flow baffle and the sliding rail fixing top seat are all of circular plate structures; the sliding rail fixing base is concentrically fixed in the valve body and is arranged close to the outlet end of the valve body; the sliding rail fixing top seat is concentrically fixed in the embedded cylindrical barrel and is arranged close to the inlet end of the valve body;
one end of the slide rail is vertically fixed with the slide rail fixing base, and the other end of the slide rail is vertically fixed with the slide rail fixing top seat; the flow baffle is concentrically arranged in the valve body and is sleeved on the sliding rail in a sliding manner; a liquid flow channel is arranged between the periphery of the flow baffle and the inner wall of the valve body, and the side surface of the flow baffle can be connected with the end part of the embedded cylindrical barrel in a sealing way; an upper through flow cavity is formed by a cavity between the sliding rail fixing top seat and the flow baffle plate, and a lower through flow cavity is formed by a cavity between the flow baffle plate and the sliding rail fixing base; and the liquid flow passage is used for communicating the upper through flow cavity with the lower through flow cavity.
Furthermore, the device also comprises a pressure limiting spring; the pressure limiting spring is arranged between the flow baffle and the sliding rail fixing top seat; one end of the pressure limiting spring is fixedly connected with the flow baffle, and the other end of the pressure limiting spring is fixedly connected with the sliding rail fixing top seat.
Furthermore, the diameter of the slide rail fixing base is matched with the inner diameter of the valve body; the periphery of the sliding rail fixing base is fixed with the inner wall of the valve body in a sealing manner; the sliding rail fixing base is characterized in that a plurality of base side through holes are uniformly formed in the circumference of the sliding rail fixing base, and a base center through hole is formed in the center of the sliding rail fixing base.
Furthermore, the diameter of the sliding rail fixing top seat is matched with the inner diameter of the embedded cylindrical barrel; the periphery of the sliding rail fixing top seat is fixed with the inner wall of the embedded cylindrical barrel in a sealing manner; and the circumference of the sliding rail fixing top seat is uniformly provided with top seat side through-flow holes.
Further, the device also comprises an inlet valve seat and an outlet valve seat; the inlet valve seat is arranged at the end part of the inlet end of the valve body, the center of the inlet valve seat is provided with a valve inlet, and the valve inlet is communicated with the inlet end of the valve body; the outlet valve seat is arranged at the end part of the outlet end of the valve body, a valve outlet is arranged in the center of the outlet valve seat, and the valve outlet is communicated with the outlet end of the valve body.
Furthermore, the inlet valve seat is in threaded connection with the inlet end of the valve body, and the outlet valve seat is in threaded connection with the valve body.
Furthermore, the slide rail is of a cylindrical slide rail structure, and two slide rails are symmetrically arranged along the axis of the valve body.
Furthermore, the side face of the flow blocking plate is provided with a sealing plug, one end of the sealing plug is fixed with the side face of the flow blocking plate in a sealing mode, and the other end of the sealing plug is connected with the inner wall of the end face of the embedded cylindrical tube in a sealing mode.
Further, a sealing element is arranged between the flow baffle and the sliding rail; the sealing element is a circular sealing structure, the inner ring of the sealing element is connected with the outer side of the sliding rail in a sealing and sliding mode, and the outer ring of the sealing element is fixed with the flow baffle in a sealing mode.
Furthermore, the sliding rail fixing base and the inner wall of the valve body are fixed by welding, and the sliding rail fixing top seat and the inner wall of the embedded cylindrical barrel are fixed by welding.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a pressure difference control check valve for a water supply treatment system, which is characterized in that an embedded cylinder is arranged at one end of a valve body, a pressure regulation and control component is arranged in the valve body, and the check valve is opened and closed by sliding of a flow baffle on a slide rail; the flow blocking plate can rapidly close the flow channel under the condition of rapid change of flow and pressure so as to prevent the downstream fluid from flowing reversely and realize the protection effect on upstream equipment or instruments; the device has simple structure, convenient use and high stability and safety.
Furthermore, a pressure limiting spring is arranged between the flow baffle plate and the sliding rail fixing top seat, the flow or pressure entering the inlet of the valve body changes, the pressure limiting spring deforms, and the flow baffle plate moves forwards or backwards to open or close the flow channel.
Furthermore, an inlet valve seat and an outlet valve seat are respectively arranged at two ends of the valve body, so that a fixed condition is provided for installation of the check valve, and the check valve is convenient to be connected into equipment.
Furthermore, the slide rails are symmetrically arranged along the axis of the valve body, so that the stability of the flow baffle in the moving process is improved.
Furthermore, the sealing plug is arranged on the side face of the flow baffle plate, so that the sealing performance of the flow baffle plate and the embedded cylindrical barrel is effectively improved, the check valve can be tightly closed, and liquid backflow is avoided.
Drawings
Fig. 1 is a cross-sectional view of a differential pressure control check valve for a feedwater treatment system according to the present invention.
The valve comprises an inlet valve seat 1, a valve inlet 2, a valve body 3, an outlet valve seat 4, a valve outlet 5, a base side through flow hole 6, a sliding rail fixing base 7, a base center through flow hole 8, a flow baffle 9, a sliding rail 10, a pressure limiting spring 11, a sliding rail fixing top seat 12, a sealing plug 13, an upper through flow cavity 14, a valve cavity 15, a lower through flow cavity 16, a sealing element 17, an upper base side through flow hole 18 and an embedded cylindrical barrel 19.
Detailed Description
In order to make the technical problem solved by the present invention, technical solution and beneficial effect are more clearly understood, and the following specific embodiments are right for the present invention to proceed further detailed description. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
As shown in the attached figure 1, the utility model provides a differential pressure control check valve for a water supply treatment system, which comprises an inlet valve seat 1, a valve body 3, an outlet valve seat 4, a pressure regulation and control assembly and an embedded cylinder 19.
The valve body 3 is of a hollow tubular structure, one end of the valve body 3 is an inlet end, and the other end of the valve body is an outlet end; the inlet valve seat 1 is arranged at the end part of the inlet end of the valve body 3, and the center of the inlet valve seat 1 is provided with a valve inlet 2; wherein the valve inlet 2 communicates with the inlet end of the valve body 3; the outlet valve seat 4 is arranged at the end part of the outlet end of the valve body 3, and a valve outlet 5 is arranged in the center of the outlet valve seat 4; wherein the valve outlet 5 is communicated with the outlet end of the valve body 3; preferably, the inlet valve seat 1 is in threaded connection with the inlet end of the valve body 3, and the outlet valve seat 4 is in threaded connection with the outlet end of the valve body 3.
The inlet valve seat 1, the outlet valve seat 4 and the cavity of the valve body 3 form a valve cavity 15, and the pressure regulating and controlling assembly is arranged in the valve cavity 15; the embedded cylindrical barrel 19 is of a hollow cylindrical barrel structure with openings at two ends, and the outer diameter of the embedded cylindrical barrel 19 is matched with the inner diameter of the valve body 3; the embedded cylindrical barrel 19 is concentrically arranged in the valve body 3; one end of the embedded cylindrical tube 19 is flush with the inlet end of the valve body 3, and the other end of the embedded cylindrical tube 19 extends towards the middle of the valve body 3.
The pressure regulating and controlling assembly comprises a sliding rail fixing base 7, a flow baffle 9, a sliding rail 10, a pressure limiting spring 11 and a sliding rail fixing top seat 12; the slide rail fixing base 7, the flow baffle plate 9 and the slide rail fixing top seat 12 are all in a circular plate-shaped structure; the diameter of the slide rail fixing base 7 is matched with the inner diameter of the valve body 3; the diameter of the flow baffle plate 9 is larger than the inner diameter of the embedded cylindrical barrel 19 and smaller than the inner diameter of the valve body 3; the diameter of the sliding rail fixing top seat 12 is matched with the inner diameter of the embedded cylindrical barrel 19.
The sliding rail fixing base 7 is concentrically fixed in the valve body 3, is arranged between the extending end of the embedded cylindrical barrel 19 and the outlet end of the valve body 3, and is close to the outlet end of the valve body 3; the periphery of the sliding rail fixing base 7 is fixed with the inner wall of the valve body 3 in a sealing way; a plurality of base side through flow holes 6 are uniformly formed in the circumference of the sliding rail fixing base 7, and a base center through flow hole 8 is formed in the center of the sliding rail fixing base 7; preferably, the sliding rail fixing base 7 and the inner wall of the valve body 3 are fixed by welding.
The sliding rail fixed top seat 12 is concentrically fixed in the embedded cylindrical barrel 19 and is arranged close to the inlet end of the valve body 3; the periphery of the sliding rail fixing top seat 12 is fixed with the inner wall of the embedded cylindrical barrel 19 in a sealing manner; the circumference of the sliding rail fixed top seat 12 is uniformly provided with top seat side through-flow holes 18; preferably, the sliding rail fixing top seat 12 and the inner wall of the embedded cylindrical barrel 19 are fixed by welding.
The sliding rail 10 is arranged between the sliding rail fixing base 7 and the sliding rail fixing top seat 12, and the axis of the sliding rail 10 is parallel to the axis of the valve body 3; one end of the slide rail 10 is vertically fixed with the slide rail fixing base 7, and the other end of the slide rail 10 is vertically fixed with the slide rail fixing top seat 12; preferably, the slide rail 10 is a cylindrical slide rail structure, and two slide rails are symmetrically arranged along the axis of the valve body 3.
The flow baffle plate 9 is concentrically arranged in the valve body 3 and is sleeved on the slide rail 10 in a sliding manner; the flow baffle 9 can slide along the axis of the slide rail 10; a liquid flow channel is arranged between the periphery of the flow baffle 9 and the inner wall of the valve body 3; the side surface of the flow baffle plate 9 can be connected with the end part of the embedded cylinder 19 in a sealing way; an upper through cavity 14 is formed by a cavity between the slide rail fixing top seat 12 and the flow baffle plate 9, and a lower through cavity 16 is formed by a cavity between the flow baffle plate 9 and the slide rail fixing base 7; the liquid flow passage is used for communicating the upper through-flow cavity 14 with the lower through-flow cavity 16.
The pressure limiting spring 11 is concentrically arranged in the valve body 3 and is arranged between the flow baffle 9 and the sliding rail fixing top seat 12; one end of the pressure limiting spring 11 is fixedly connected with the flow baffle 9, and the other end of the pressure limiting spring 11 is fixedly connected with the sliding rail fixing top seat 12; a sealing plug 13 is arranged on the side surface of the flow baffle plate 9, and one end of the sealing plug 13 is fixed with the side surface of the flow baffle plate 9 in a sealing manner; a sealing groove is formed in the inner wall of the extending end of the embedded cylindrical barrel 19, and the other end of the sealing plug 13 is arranged in the sealing groove in a sealing mode; the flow baffle 9 is provided with a slide rail through hole, and the slide rail 10 is slidably arranged in the slide rail through hole in a penetrating manner; a sealing element 17 is arranged between the flow baffle 9 and the slide rail 10; the sealing element 17 is a circular sealing structure, the inner ring of the sealing element 17 is connected with the outer side of the sliding rail 10 in a sealing and sliding manner, and the outer ring of the sealing element 17 is fixed with the sliding rail through hole of the flow baffle plate 9 in a sealing manner.
The working principle is as follows:
when the fluid pressure at the valve inlet 2 exceeds the deformation pressure of the pressure limiting spring 11, the flow baffle plate 9 moves along the extension direction of the pressure limiting spring 11, the sealing plug 13 fixed on the flow baffle plate 9 is separated from the end surface of the embedded cylindrical barrel, and the flow channel is opened; when the fluid pressure at the valve inlet 2 is lower than the deformation pressure of the pressure limiting spring 11, the flow baffle plate 9 moves along the compression direction of the pressure limiting spring 11, the sealing plug 13 fixed on the flow baffle plate 9 is combined with the end face of the embedded cylindrical barrel in a sealing mode, and the flow channel is closed.
Specifically, firstly, water flows from the valve inlet 2 into the upper through-flow cavity 14 through the top seat side through-flow hole 18, then the flow baffle plate 9 is pushed to move towards the extension direction of the pressure limiting spring 11, the sealing plug 13 fixed on the flow baffle plate 9 is separated from the end face of the embedded cylindrical barrel, the flow channel is opened, the water flows into the lower through-flow cavity 16, flows out through the valve outlet 5 through the base side through-flow hole 6 and the base center through-flow hole 8, and enters the downstream; when water flow is reduced or cut off, the pressure limiting spring 11 pulls the flow baffle plate 9 to move along the compression direction of the spring, the sealing plug 13 fixed on the flow baffle plate 9 is combined with the end face of the embedded cylindrical barrel in a sealing mode, the flow channel is closed, and downstream fluid is blocked outside the flow baffle plate 9.
In the utility model, an inlet valve seat 1 and an outlet valve seat 4 are respectively arranged at two ends of a valve body 3, and a pressure regulating component is arranged in the valve body 3; the space between the inlet valve seat 1, the outlet valve seat 4 and the valve body 3 forms a valve cavity 15, and an upper through flow cavity 14 and a lower through flow cavity 16 are divided in the valve cavity 15; wherein, the space between the slide rail fixing top seat 12 and the flow baffle plate 9 forms an upper through flow cavity 14, and the space between the flow baffle plate 9 and the slide rail fixing base 7 forms a lower through flow cavity 16; two ends of the slide rail 10 are respectively connected with the slide rail fixing top seat 12 and the slide rail fixing base 7, and the flow baffle plate 9 is hermetically and slidably arranged on the slide rail 10; a liquid flow channel is formed in a gap between the flow baffle plate 9 and the valve body 3 and is communicated with the lower through cavity 16; one end of the pressure limiting spring 11 is connected with the sliding rail fixing top seat 12, and the other end of the pressure limiting spring is connected with the flow baffle plate 9; the sliding rail 10 is cylindrical, 2 sliding rails are symmetrically arranged along the axis of the valve body 3, and the sliding rail 10 is connected with the sliding rail fixing top seat 12 and the sliding rail fixing base 7 in a welding mode respectively; the flow baffle 9 is provided with a sealing plug 13, and the flow baffle 9 is connected with the slide rail 10 through a sealing element 17; preferably, the sliding rail fixing top seat 12 is cylindrical and is provided with 2 top seat side through holes 18 symmetrically distributed along the circumference center; the sliding rail fixing base 7 is cylindrical, and is provided with a fixing base center through hole 8 which takes the center of the sliding rail fixing base 7 as the center of a circle and has the same hole diameter as the distance between the 2 sliding rails 10; 2 base side through flow holes 6 symmetrically distributed along the circumferential center of the sliding rail fixing base 7; preferably, the sealing plug 13 is a cuboid cubic column, and is matched with the embedded structure of the valve body 3, and the sealing plug 13 and the valve body 3 can form a complete plane.
The pressure difference control check valve for the water supply treatment system has simple structure, can realize that the flow baffle can quickly seal a flow channel and prevent the downstream fluid from flowing reversely under the condition of rapid change of inlet flow and pressure, thereby protecting upstream equipment and instruments; by arranging the pressure regulating and controlling assembly, the flow or pressure entering the valve inlet changes to cause the pressure limiting spring to deform, the flow baffle plate moves forwards or reversely, the inlet and the outlet of the sealing plug in the embedded structure of the valve body are changed, and the flow channel is opened or closed; the quick response is met, namely the reverse flow of the downstream liquid medium is quickly prevented under the condition that the outlet pressure and the inlet pressure of the valve are suddenly changed, so that the safety and the reliability of upstream equipment and meters are guaranteed.
The above embodiment is only one of the embodiments that can realize the technical solution of the present invention, and the scope of the present invention is not limited by the embodiment, and includes any changes, substitutions and other embodiments that can be easily conceived by those skilled in the art within the technical scope of the present invention.
Claims (10)
1. A differential pressure control check valve for a feed water treatment system is characterized by comprising a valve body (3), a pressure regulation and control component and an embedded cylinder (19); the valve body (3) is of a hollow tubular structure, and the embedded cylindrical barrel (19) is concentrically arranged in the valve body (3); one end of the embedded cylindrical barrel (19) is flush with the inlet end of the valve body (3), and the other end of the embedded cylindrical barrel (19) extends towards the middle of the valve body (3);
the pressure regulating and controlling component is arranged in the valve body (3) and comprises a sliding rail fixing base (7), a flow baffle plate (9), a sliding rail (10) and a sliding rail fixing top seat (12); the sliding rail fixing base (7), the flow baffle plate (9) and the sliding rail fixing top seat (12) are all of circular plate-shaped structures; the sliding rail fixing base (7) is concentrically fixed in the valve body (3) and is arranged close to the outlet end of the valve body (3); the sliding rail fixing top seat (12) is concentrically fixed in the embedded cylindrical barrel (19) and is arranged close to the inlet end of the valve body (3);
one end of the slide rail (10) is vertically fixed with the slide rail fixing base (7), and the other end of the slide rail (10) is vertically fixed with the slide rail fixing top seat (12); the flow baffle plate (9) is concentrically arranged in the valve body (3) and is sleeved on the sliding rail (10) in a sliding manner; a liquid flow channel is arranged between the periphery of the flow baffle plate (9) and the inner wall of the valve body (3), and the side surface of the flow baffle plate (9) can be connected with the end part of the embedded cylindrical barrel (19) in a sealing way; a cavity between the slide rail fixing top seat (12) and the flow baffle plate (9) forms an upper through flow cavity (14), and a cavity between the flow baffle plate (9) and the slide rail fixing base (7) forms a lower through flow cavity (16); the liquid flow passage is used for communicating the upper through-flow cavity (14) with the lower through-flow cavity (16).
2. The differential pressure control check valve for the feedwater treatment system of claim 1, further comprising a pressure limiting spring (11); the pressure limiting spring (11) is arranged between the flow baffle plate (9) and the sliding rail fixing top seat (12); one end of the pressure limiting spring (11) is fixedly connected with the flow baffle plate (9), and the other end of the pressure limiting spring (11) is fixedly connected with the sliding rail fixing top seat (12).
3. The differential pressure control check valve for the feedwater treatment system of claim 1, wherein the slide rail fixing base (7) has a diameter matching with the inner diameter of the valve body (3); the periphery of the sliding rail fixing base (7) is fixed with the inner wall of the valve body (3) in a sealing way; the sliding rail fixing base is characterized in that a plurality of base side through flow holes (6) are uniformly formed in the circumference of the sliding rail fixing base (7), and a base center through flow hole (8) is formed in the center of the sliding rail fixing base (7).
4. The differential pressure control check valve for the feedwater treatment system of claim 1, wherein the slide rail fixing top seat (12) has a diameter matching the inner diameter of the embedded cylinder (19); the periphery of the sliding rail fixing top seat (12) is fixed with the inner wall of the embedded cylindrical barrel (19) in a sealing way; wherein, the circumference of the sliding rail fixed top seat (12) is uniformly provided with top seat side through flow holes (18).
5. A differential pressure control check valve for a feedwater treatment system according to claim 1, further comprising an inlet valve seat (1) and an outlet valve seat (4); the inlet valve seat (1) is arranged at the inlet end of the valve body (3), a valve inlet (2) is arranged in the center of the inlet valve seat (1), and the valve inlet (2) is communicated with the inlet end of the valve body (3); the outlet valve seat (4) is arranged at the end part of the outlet end of the valve body (3), a valve outlet (5) is arranged at the center of the outlet valve seat (4), and the valve outlet (5) is communicated with the outlet end of the valve body (3).
6. The differential pressure control check valve for the feedwater treatment system of claim 5, wherein the inlet valve seat (1) is in threaded connection with the inlet end of the valve body (3), and the outlet valve seat (4) is in threaded connection with the valve body (3).
7. The differential pressure control check valve for the feedwater treatment system of claim 1, wherein the slide rail (10) is a cylindrical slide rail structure, and two slide rails are symmetrically arranged along the axis of the valve body (3).
8. The differential pressure control check valve for the water supply treatment system according to claim 1, characterized in that a sealing plug (13) is arranged on the side surface of the flow baffle plate (9), one end of the sealing plug (13) is fixed to the side surface of the flow baffle plate (9) in a sealing manner, and the other end of the sealing plug (13) is connected to the inner wall of the end surface of the embedded cylindrical barrel (19) in a sealing manner.
9. The differential pressure control check valve for a feedwater treatment system of claim 1 wherein a seal (17) is disposed between the baffle plate (9) and the slide rail (10); the sealing element (17) is of a circular sealing structure, the inner ring of the sealing element (17) is connected with the outer side of the sliding rail (10) in a sealing and sliding mode, and the outer ring of the sealing element (17) is fixed with the flow baffle plate (9) in a sealing mode.
10. The differential pressure control check valve for the feedwater treatment system of claim 1, wherein the slide rail fixing base (7) is fixed with the inner wall of the valve body (3) by welding, and the slide rail fixing top seat (12) is fixed with the inner wall of the embedded cylinder (19) by welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222008755.9U CN217977558U (en) | 2022-08-01 | 2022-08-01 | Differential pressure control check valve for water supply treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222008755.9U CN217977558U (en) | 2022-08-01 | 2022-08-01 | Differential pressure control check valve for water supply treatment system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217977558U true CN217977558U (en) | 2022-12-06 |
Family
ID=84255371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222008755.9U Active CN217977558U (en) | 2022-08-01 | 2022-08-01 | Differential pressure control check valve for water supply treatment system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217977558U (en) |
-
2022
- 2022-08-01 CN CN202222008755.9U patent/CN217977558U/en active Active
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