One-way pneumatic unloading valve

Abstract

The utility model relates to unloading valve technical field discloses a one -way pneumatic unloading valve, include: first valve body, second valve body and third valve body, first valve body and second valve body are detachably connected through the connector, and the second valve body is opened in and is equipped with the adjusting cavity, is provided with valve rod and valve seat in the adjusting cavity, and one end of valve rod connects first valve body, and the other end is embedded in valve seat, and the other end of valve seat is fixedly connected with first spring, and first spring sets up in third valve body, and the other end of first spring is fixedly connected third valve body, be provided with water inlet hole, water outlet hole and overflow hole on second valve body, and water inlet hole, water outlet hole and overflow hole all communicate with adjusting cavity, through first spring and adjusting cavity cavity division accurate control overflow, stabilize system pressure, and the structure of pressure -bearing block, second spring and star type sealing strip blocks reverse water flow, and the impact is prevented, and the pressure is preserved, function integration greatly simplifies the pipeline layout of high pressure water system, reduces equipment quantity and installation space, and the overall cost is low.

Description

Technical Field

[0001] This utility model relates to the field of unloading valve technology, specifically to a one-way pneumatic unloading valve. Background Technology

[0002] In high-pressure water systems in industrial applications, high-pressure water pumps, acting as pressure sources, need to continuously output water at specific pressures to meet operational requirements. However, conditions such as downstream spray gun shutdown or pipeline blockage can easily lead to a sudden increase in system pressure, damaging critical components such as pumps, pipelines, and terminal equipment, causing safety accidents, increasing maintenance costs, and affecting operational accuracy. Early industry-used manual pressure relief valves were slow to respond and required dedicated personnel. Ordinary spring-loaded relief valves, relying on manual operation, also had slow response times and could not handle instantaneous overpressure. Furthermore, ordinary spring-loaded relief valves lack precise chamber and seat fitting structures, making them prone to overflow pressure drift due to spring misalignment and seal failure. This makes it impossible to stably control the pressure within safe thresholds and cope with water hammer impacts and system pressure maintenance requirements. Utility Model Content

[0003] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a one-way pneumatic unloading valve with dual functions of pressure limiting and releasing and one-way pressure holding. Through optimized structure, it can sense pressure changes and respond instantly to release pressure, while preventing water flow in reverse. Installed between the water pump outlet and the main pipeline, it can directly capture pressure signals, simplifying the maintenance process, improving wear resistance, and ensuring the pressure stability and equipment safety of the high-pressure water system.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A one-way pneumatic unloading valve includes: a first valve body, a second valve body, and a third valve body. The first valve body and the second valve body are detachably connected via a connector. The second valve body has an adjustment chamber, and a valve stem and a valve seat are disposed within the adjustment chamber. One end of the valve stem is connected to the first valve body, and the other end is embedded in the valve seat. The other end of the valve seat is fixedly connected to a first spring, which is disposed within the third valve body, and the other end of the first spring is fixedly connected to the third valve body. The second valve body has an inlet hole, an outlet hole, and an overflow hole, all of which communicate with the adjustment chamber.

[0005] In this utility model, preferably, the first valve body includes a detachably connected upper cover and a lower cover, the lower cover is provided with a pressure-bearing block, and one end of the pressure-bearing block is connected to an embedded rod.

[0006] In this utility model, preferably, the outer ring of the pressure block is provided with two annular grooves, and the two annular grooves are respectively placed with a star-shaped sealing strip and a guide ring.

[0007] In this utility model, preferably, the pressure block is provided with an annular groove on the side facing the embedded rod, and a second spring is fixedly connected to the annular groove, with the other end of the second spring fixed to the first valve body.

[0008] In this utility model, preferably, an inner and outer threaded connector is fixedly provided on the inner side of the end of the lower cover, one end of the connector is embedded in the inner and outer threaded connector, and the other end is embedded in the second valve body.

[0009] In this utility model, preferably, the embedded rod passes sequentially through the lower cover, the internal and external threaded joints, and the connector from the end connected to the pressure block and then connects to the valve stem.

[0010] In this utility model, preferably, the end of the embedding rod is provided with an embedding groove, and the end of the valve rod connected to the embedding rod is disposed in the embedding groove.

[0011] In this utility model, preferably, the valve seat has a hollow structure with a second groove at its end. One end of the first spring is fixed in the second groove, and the other end is fixed on the inner side wall of the third valve body cavity.

[0012] In this utility model, preferably, the regulating chamber includes a positive pressure chamber and an overflow chamber. The positive pressure chamber includes a first chamber and a second chamber. One end of the valve seat connected to the valve stem is disposed in the second chamber. Its outer diameter is equal to the inner diameter of the first chamber and smaller than the inner diameter of the second chamber. The outer diameter of the middle part of the valve seat is equal to the inner diameter of the second chamber.

[0013] In this invention, preferably, the outer diameter of the end of the valve seat connected to the third valve body is equal to the inner diameter of the overflow cavity.

[0014] Compared with the prior art, the beneficial effects of this utility model are: This utility model's unloading valve eliminates the need for additional check valves or pressure regulating valves. It achieves pressure limiting and release as well as one-way pressure holding through the same valve body structure. The overflow is precisely controlled by the first spring and the regulating chamber, stabilizing the system pressure. The structure of the pressure-bearing block, the second spring, and the star-shaped sealing strip blocks reverse water flow, preventing impact and maintaining pressure. The integrated functions greatly simplify the pipeline layout of the high-pressure water system, reduce the number of equipment and installation space, and result in low overall cost. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a one-way pneumatic unloading valve according to the present invention.

[0016] Figure 2 This is a first-view sectional view of a one-way pneumatic unloading valve according to the present invention.

[0017] Figure 3 This is a second-view sectional view of a one-way pneumatic unloading valve according to the present invention.

[0018] In the attached diagram: 1-First valve body, 2-Second valve body, 3-Third valve body, 4-Connector, 5-Valve stem, 6-Valve seat, 7-First spring, 8-Inlet hole, 9-Outlet hole, 10-Overflow hole, 11-Upper cover, 12-Lower cover, 13-Pressure block, 14-Embedded rod, 15-Star-shaped sealing strip, 16-Guide ring, 17-Second spring, 18-Internal and external threaded connector, 19-First cavity, 20-Second cavity, 21-Overflow cavity. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] Please also see Figures 1 to 3A preferred embodiment of this utility model provides a one-way pneumatic unloading valve, which enables water to flow out from the outlet under normal water pressure. When the input water pressure exceeds a set value, water is discharged from the drain valve and flows back to the water tank or drain, thereby ensuring that the output water pressure is below a safe value and preventing damage to subsequent pumps, pipelines, and seals due to overpressure. The unloading valve specifically includes: a first valve body 1, a second valve body 2, and a third valve body 3. The first valve body 1 and the second valve body 2 are detachably connected via a connector 4, and the second valve body 2 and the third valve body 3 are detachably and seamlessly connected by bolts. The second valve body 2 has an adjustment chamber, within which a valve stem 5 and a valve seat 6 are installed. One end of the valve stem 5 is connected to the first valve body 1, and the other end is embedded in the valve seat 6. The other end of the valve seat 6 is fixedly connected to a first spring 7, which is located within the third valve body 3, with its other end also fixedly connected to the third valve body 3. The second valve body 2 has an inlet hole 8, an outlet hole 9, and an overflow hole 10, all of which communicate with the adjustment chamber. The inlet hole 8 and outlet hole 9 are used to connect the inlet and outlet pipes, respectively, while the overflow hole 10 is used to connect the overflow pipe. Both the valve stem 5 and the valve seat 6 are located in the regulating chamber. Under the action of water pressure, the valve seat 6 moves towards the end of the third valve body 3. When the water pressure is within the normal range, the distance that the valve seat 6 moves with the valve stem 5 is such that water flows out from the outlet hole 9. When the water pressure increases, the water pressure causes the valve seat 6 to continue moving towards the end of the third valve body 3. When the water pressure exceeds the limit value, the distance that the valve seat 6 moves increases, the overflow hole 10 opens, and part of the water in the regulating chamber flows out from the overflow port, so that the outflowing water pressure is not too high.

[0023] In this embodiment, the first valve body 1 includes a detachably connected upper cover 11 and a lower cover 12. A pressure-bearing block 13 is provided inside the lower cover 12, and an embedded rod 14 is connected to one end of the pressure-bearing block 13. The upper cover 11 has a circular structure with several through holes on its surface. The lower cover 12 has a trumpet-shaped structure with a consistent through hole at the bottom of the side connected to the upper cover 11. The upper cover 11 and the lower cover 12 are connected by placing bolts in the through holes. A sealing groove is also provided on the inner side of the bottom of the lower cover 12, and a sealing ring is placed in the sealing groove to enhance the sealing between the upper cover 11 and the lower cover 12. A T-type one-way valve 21 is fixedly connected to the outside of the upper cover 11. A pressure-bearing block 13 is provided inside the lower cover 12, with its bottom sealed to one side of the bottom of the lower cover 12, and its end connected to the embedded rod 14.

[0024] In this embodiment, the outer ring of the pressure block 13 is provided with two annular grooves, each holding a star-shaped sealing strip 15 and a guide ring 16. The star-shaped sealing strip 15 enhances the sealing between the pressure block 13 and the lower cover 12, preventing it from shifting or falling off during the movement of the pressure block 13. When the pressure block 13 contacts the inner wall of the lower cover 12, the star-shaped sealing strip 15 is subjected to the squeezing force between them, causing its star-shaped cross-section structure to undergo elastic deformation, tightly filling the tiny gap between the pressure block 13 and the inner wall of the lower cover 12. Under system pressure, the pressure further pushes the sealing strip to adhere to the contact surface; the higher the pressure, the tighter the adhesion, thereby preventing high-pressure water from leaking from the gap between the pressure block 13 and the lower cover 12, ensuring stable internal valve pressure, and avoiding pressure loss or system failure due to seal failure. The guide ring 16 is installed in another annular groove on the outer ring of the pressure block 13, and its material typically has good wear resistance and rigidity. When system pressure changes cause the pressure block 13 to move axially, the guide ring 16 maintains sliding contact with the inner wall of the lower cover 12. The annular groove limits the guide ring 16, preventing it from tilting or misaligning during sliding. Simultaneously, the guide ring 16 restricts the radial displacement of the pressure block 13, ensuring that the pressure block 13 always moves along the axial direction of the lower cover 12. This prevents misalignment between the valve stem 5 and the valve seat 6 due to pressure block 13 offset, thus ensuring normal valve switching and maintaining the stability of the unidirectional pressure-holding function.

[0025] In this embodiment, the pressure block 13 has an annular groove on the side facing the embedded rod 14. A second spring 17 is fixedly connected to the annular groove, and the other end of the second spring 17 is fixed inside the first valve body 1. The reverse flow of water will generate reverse pressure on the pressure block 13, pushing the pressure block 13 to move away from the embedded rod 14, that is, to move towards the inside of the first valve body 1. The annular groove on one side of the pressure block 13 provides a fixed fulcrum for the second spring 17, so that the second spring 17 can undergo elastic deformation synchronously with the movement of the pressure block 13. When the pressure block 13 moves in the reverse direction, the second spring 17 is compressed, generating an elastic force opposite to the reverse pressure of the water flow. This elastic force will push the pressure block 13 in the reverse direction, helping the pressure block 13 to fit tightly against the inner wall of the lower cover 12, further enhancing the sealing effect, blocking the flow path of reverse water flow, ensuring the stable realization of the one-way pressure holding function, and avoiding water hammer impact damage to components such as the water pump impeller and check valve.

[0026] In this embodiment, an internal and external threaded connector 18 is fixedly provided on the inner side of the end of the lower cover 12. One end of the connector 4 is embedded in the internal and external threaded connector 18, and the other end is embedded in the second valve body 2. The internal and external threaded connector 18 is fixed on the inner side of the end of the lower cover 12 by threaded connection or interference fit. The internal thread structure of the internal and external threaded connector 18 provides a standardized interface for the connector 4 to be embedded and fixed, avoiding assembly deviation caused by the connector 4 directly mating with the non-standard inner wall of the lower cover 12. At the same time, the length and radial dimensions of the internal and external threaded connector 18 are adapted to compensate for the assembly gap between the lower cover 12 and the second valve body 2, ensuring that the axes of the first valve body 1 and the second valve body 2 are completely coincident, laying the foundation for the subsequent precise connection of the embedded rod 14 and the valve stem 5. One end of the connector 4 is embedded in the internal and external threaded connector 18, and radial positioning is achieved by limiting the internal and external threaded connector 18; the other end is embedded in the second valve body 2, forming a tight fit with the interface of the second valve body 2. Finally, the first valve body 1 and the second valve body 2 are detachably connected into a whole by the connector 4. This not only avoids the interface loosening caused by vibration due to the direct rigid connection between the two valve bodies, but also limits the relative displacement of the two valve bodies through the embedded structure, ensuring the stability of the overall valve structure under high pressure conditions.

[0027] In this embodiment, the embedded rod 14 passes sequentially through the lower cover 12, the internal and external threaded joint 18, and the connector 4 from one end connected to the pressure-bearing block 13, and then connects to the valve stem 5. One end of the embedded rod 14 is connected to the pressure-bearing block 13, and the other end passes sequentially through the lower cover 12, the internal and external threaded joint 18, and the connector 4, and then connects to the valve stem 5. Its path is entirely along the axial direction of the valve body. When the system pressure changes, the displacement of the pressure-bearing block 13 is directly transmitted to the valve stem 5 through the embedded rod 14, causing the valve stem 5 to push the valve seat 6 along the axial direction. Conversely, when the system pressure decreases and the first spring 7 pushes the valve seat 6 to reset, the displacement of the valve stem 5 is also transmitted in the opposite direction to the pressure-bearing block 13 through the embedded rod 14, thus resetting the pressure-bearing block 13. This through-path structure ensures that the linkage chain of the pressure-bearing block 13, the embedded rod 14, the valve stem 5, and the valve seat 6 has no radial offset, and the force and displacement transmission is lossless.

[0028] In this embodiment, an embedding groove is provided at the end of the embedding rod 14, and the end of the valve stem 5 connected to the embedding rod 14 is disposed in the embedding groove. The embedding groove at the end of the embedding rod 14 provides a recessed connection space for the valve stem 5. After one end of the valve stem 5 is embedded in the groove, the inner wall of the embedding groove can restrict the radial displacement of the valve stem 5, preventing misalignment or shaking after the valve stem 5 is connected to the embedding rod 14. Under high pressure conditions, even if there is vibration inside the valve, the tight fit between the embedding groove and the valve stem 5 can ensure that the two always move synchronously, preventing linkage delay caused by loose connection.

[0029] In this embodiment, the valve seat 6 has a hollow structure with a second groove at its end. One end of the first spring 7 is fixed in the second groove, and the other end is fixed to the inner side wall of the cavity of the third valve body 3. When the system pressure increases, high-pressure water enters the regulating chamber through the inlet hole 8, generating a thrust on the side of the valve seat 6 facing the third valve body 3. This thrust needs to overcome the preload of the first spring 7. The second groove fixes one end of the first spring 7 at a fixed point, so that the spring force can be evenly applied to the end of the valve seat 6, avoiding uneven force caused by spring deviation. When the thrust is greater than the spring preload, the first spring 7 is compressed, and the valve seat 6 moves towards the third valve body 3 until the overflow hole 10 communicates with the regulating chamber, thereby releasing pressure. Pressure drop and reset seal: When the system pressure decreases, the thrust on the valve seat 6 decreases, and the reset force of the first spring 7 pushes the valve seat 6 in the opposite direction through the second groove, causing the valve seat 6 to move towards the water inlet 8 until the sealing surface of the valve seat 6 re-fits the inner wall of the regulating cavity, blocking the overflow channel and restoring the normal water supply state; throughout the process, the limiting effect of the second groove on the first spring 7 ensures that the spring always extends and retracts along the axis of the valve seat 6, avoiding the valve seat 6 from getting stuck due to spring twisting, and ensuring the timeliness of state switching.

[0030] In this embodiment, the regulating chamber includes a positive pressure chamber and an overflow chamber 21, which are separated by a valve seat 6. The positive pressure chamber includes a first chamber 19 and a second chamber 20. One end of the valve seat 6 connected to the valve stem 5 is located in the second chamber 20, and its outer diameter is equal to the inner diameter of the first chamber 19 but smaller than the inner diameter of the second chamber 20. The outer diameter of the middle part of the valve seat 6 is equal to the inner diameter of the second chamber 20. The outer diameter of the end of the valve seat 6 connected to the third valve body 3 is equal to the inner diameter of the overflow chamber 21. The positive pressure chamber serves as the primary flow area for high-pressure water after entering through the inlet hole 8. The stepwise design of the first chamber 19 and the second chamber 20 provides a basis for pressure transmission and sealing of the valve seat 6. The inlet hole 8 is directly connected to the first chamber 19. After the high-pressure water enters, it first fills the first chamber 19, forming a uniform thrust on the valve seat 6, and then fills the second chamber 20. The outlet hole 9 is connected to the second chamber 20, and water is discharged from the outlet hole 9. The overflow chamber 21 is independent of the positive pressure chamber and is controlled to open and close the positive pressure chamber only by the movement of the valve seat 6. Its core function is to provide a pressure relief channel when there is overpressure. When the input water pressure is greater than the set pressure, the water pressure push overcomes the preload of the first spring 7 and pushes the valve seat 6 to move towards the third valve body 3. The end of the valve seat 6 connected to the third valve body 3 moves into the overflow chamber 21 with the valve seat 6. The positive pressure chamber, which was originally sealed in the middle of the valve seat 6, forms a communication channel with the overflow chamber 21. High-pressure water flows from the positive pressure chamber into the overflow chamber 21 and is finally discharged through the overflow hole 10 to reduce the system pressure. When the pressure drops below the set value, the first spring 7 pushes the valve seat 6 to reset, and the middle of the valve seat 6 reseals the second chamber 20, cutting off the connection between the positive pressure chamber and the overflow chamber 21 and restoring normal water supply.

[0031] The matching dimensions of valve seat 6 ensure a surface contact seal between its middle section and the inner wall of the second cavity 20. Compared to a line contact seal, this more effectively blocks crossflow between the positive pressure chamber and the overflow chamber 21, preventing pressure loss caused by high-pressure water leakage into the overflow chamber 21 under normal operating conditions, or incomplete pressure relief under overpressure conditions. The outer diameter of the connection end between valve seat 6 and the third valve body 3 is equal to the inner diameter of the overflow chamber 21. When valve seat 6 moves to the overflow position, this part fits against the inner wall of the overflow chamber 21, preventing high-pressure water from leaking into the third valve body 3 through the gap between valve seat 6 and overflow chamber 21, and guiding the high-pressure water to flow directionally towards the overflow hole 10, ensuring pressure relief efficiency. The physical isolation between the positive pressure chamber and the overflow chamber 21 makes the normal water supply and overpressure relief processes completely independent, preventing pressure transmission distortion caused by crossflow between chambers. This ensures that valve seat 6 only triggers overflow when the system pressure reaches the set value, resulting in smaller pressure control errors.

[0032] The above description is a detailed description of the preferred embodiments of the present utility model. However, the embodiments are not intended to limit the scope of the patent application of the present utility model. All equivalent changes or modifications made under the technical spirit of the present utility model should fall within the patent scope covered by the present utility model.

Claims

1. A one-way pneumatic unloading valve, characterized in that, include: The valve body consists of a first valve body (1), a second valve body (2), and a third valve body (3). The first valve body (1) and the second valve body (2) are detachably connected by a connector (4). The second valve body (2) has an adjustment chamber. A valve stem (5) and a valve seat (6) are provided in the adjustment chamber. One end of the valve stem (5) is connected to the first valve body (1), and the other end is embedded in the valve seat (6). The other end of the valve seat (6) is fixedly connected to a first spring (7). The first spring (7) is provided in the third valve body (3), and the other end of the first spring (7) is fixedly connected to the third valve body (3). The second valve body (2) is provided with an inlet hole (8), an outlet hole (9) and an overflow hole (10), and the inlet hole (8), the outlet hole (9) and the overflow hole (10) are all connected to the regulating cavity.

2. The one-way pneumatic unloading valve according to claim 1, characterized in that, The first valve body (1) includes a detachably connected upper cover (11) and a lower cover (12). The lower cover (12) is provided with a pressure block (13), and one end of the pressure block (13) is connected to an embedded rod (14).

3. A one-way pneumatic unloading valve according to claim 2, characterized in that The outer ring of the pressure block (13) is provided with two annular grooves, and the two annular grooves are respectively placed with a star-shaped sealing strip (15) and a guide ring (16).

4. A one-way pneumatic unloading valve according to claim 2, characterized in that, The pressure block (13) has an annular groove on the side opposite to the embedded rod (14), and a second spring (17) is fixedly connected to the annular groove. The other end of the second spring (17) is fixed inside the first valve body (1).

5. A one-way pneumatic unloading valve according to claim 4, characterized in that, The inner side of the end of the lower cover (12) is fixedly provided with an inner and outer threaded connector (18), one end of the connector (4) is embedded in the inner and outer threaded connector (18), and the other end is embedded in the second valve body (2).

6. A one-way pneumatic unloading valve according to claim 2, characterized in that, The embedded rod (14) passes sequentially through the lower cover (12), the internal and external threaded joint (18), and the connector (4) from one end connected to the pressure block (13) and then connects to the valve stem (5).

7. A one-way pneumatic unloading valve according to claim 2, characterized in that, The end of the embedded rod (14) is provided with an embedded groove, and the end of the valve rod (5) connected to the embedded rod (14) is set in the embedded groove.

8. A one-way pneumatic unloading valve according to claim 7, characterized in that, The valve seat (6) has a hollow structure and a second groove is provided at its end. One end of the first spring (7) is fixed in the second groove and the other end is fixed on the inner side wall of the cavity of the third valve body (3).

9. A one-way pneumatic unloading valve according to claim 8, characterized in that, The regulating chamber includes a positive pressure chamber and an overflow chamber (21). The positive pressure chamber includes a first chamber (19) and a second chamber (20). One end of the valve seat (6) connected to the valve stem (5) is located in the second chamber (20). Its outer diameter is equal to the inner diameter of the first chamber (19) and smaller than the inner diameter of the second chamber (20). The outer diameter of the middle part of the valve seat (6) is equal to the inner diameter of the second chamber (20).

10. A one-way pneumatic unloading valve according to claim 9, characterized in that The outer diameter of the end of the valve seat (6) connected to the third valve body (3) is equal to the inner diameter of the overflow chamber (21).

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