Pressure protection valve for pipe network

Abstract

The utility model discloses a pressure protection valve for pipe network belongs to valve technical field, aims at solving the problem that the existing pressure protection valve is easy to produce cavitation under high pressure difference, and fluid impurity can cause the problem of valve core jam. The valve includes valve body, valve stem, first spring and the anti -air assembly of setting in the valve body, and the anti -air assembly includes the valve cage with a plurality of round holes, and the valve core is slidably fitted in the valve cage. Its core lies in, and the cleaning assembly is integrated on the valve core, and the cleaning assembly includes the scraper and second spring, and the valve core outer wall is provided with the containing groove that contains the scraper, and the scraper is slidably arranged in the containing groove, and the second spring is arranged in the containing groove. The utility model passes on the round hole of valve cage and divides the energy consumption, and effectively inhibits cavitation and noise, and simultaneously, utilizes the valve core movement to drive the cleaning assembly to carry out the on -line automatic scraping cleaning to the valve cage inner wall, prevents the jam caused by the accumulation of impurity, and improves the reliability and service life of valve operation.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a pressure protection valve for pipeline networks. Background Technology

[0002] Pressure protection valves are critical safety accessories in pipeline systems. Their main function is to automatically open when the system pressure exceeds a preset safety value, releasing the medium to reduce the pressure and thus protecting pipelines, pumps, and other equipment from overpressure damage. In many industrial applications, such as fire protection, water supply, or chemical pipeline networks, pressure protection valves need to relieve pressure under high pressure differential conditions.

[0003] When existing conventional pressure relief valves perform pressure relief, high-pressure fluid flows through the throttling region of the valve orifice, causing a sharp increase in flow velocity and a sudden drop in pressure. When the local pressure drops to the fluid's saturated vapor pressure at that temperature, a large number of tiny bubbles are generated in the fluid. These bubbles, carried by the fluid to the downstream high-pressure zone, rapidly burst, generating strong impact forces and high temperatures—a phenomenon known as cavitation. Continuous cavitation not only produces severe noise and vibration but also causes corrosive damage to the metal surfaces of critical components such as the valve core and seat, significantly shortening the valve's service life and affecting the stable operation of the pipeline system.

[0004] Furthermore, the fluids in pipelines often contain solid impurities such as silt and rust. During long-term valve operation, these impurities easily deposit and adhere in the precision-fitted gaps between the valve core and the valve body guide surfaces. The continuous accumulation of impurities increases the movement resistance of the valve core, leading to anything from slow valve opening and closing or malfunction to complete valve core jamming, causing the pressure protection valve to lose its intended safety protection function and posing a serious safety hazard. Currently, solving this problem mainly relies on periodic manual disassembly, cleaning, and maintenance, which not only increases operating costs but also fails to guarantee valve reliability between maintenance cycles.

[0005] Therefore, this utility model proposes a pressure protection valve for pipeline networks to overcome the shortcomings of the prior art. Utility Model Content

[0006] To overcome the above shortcomings, this utility model provides a pressure protection valve for pipeline networks, which aims to improve the technical problems of existing pressure protection valves for pipeline networks that are prone to cavitation and noise during high pressure differential relief, and that impurities in the fluid can easily cause valve core jamming or damage to the sealing surface.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a pressure protection valve for pipeline networks, comprising: a valve body, an anti-gas component, a valve core, a valve stem, a first spring; and a cleaning component integrated with the valve core.

[0008] The cleaning component includes a scraper and a second spring. The outer wall of the valve core has a receiving groove for accommodating the scraper. The scraper is slidably connected in the receiving groove, and the second spring is disposed inside the receiving groove.

[0009] Furthermore, the valve body, the anti-gas component, the valve core, and the cleaning component are fixed inside the valve body via the valve cage of the anti-gas component. The valve core is slidably fitted into the inner cavity of the valve cage. One end of the second spring of the cleaning component is fixed inside the valve core, and the other end is fixed to the side wall of the scraper, which is used to continuously push the edge of the scraper to press against the inner wall of the valve cage.

[0010] Preferably, the anti-gas component further includes a first sealing gasket disposed at the bottom of the valve cage, and a second sealing gasket is disposed at the bottom of the valve core. When the valve core moves to the position of blocking the flow port, the second sealing gasket and the first sealing gasket are pressed tightly together.

[0011] Preferably, the first sealing gasket and the second sealing gasket are made of a combination of rigid and soft materials.

[0012] Preferably, the valve core is further provided with a slag-collecting groove, which is located below the scraper and is used to collect the impurities scraped off by the scraper.

[0013] Preferably, the slag-containing groove is an annular groove formed along the outer periphery of the valve core.

[0014] Preferably, the edge of the scraper that is in close contact with the inner wall of the valve cage is blade-shaped.

[0015] Preferably, the second spring is a compression spring, and the direction of its elastic force is perpendicular to the sliding axis of the valve core.

[0016] Preferably, the inner cavity of the valve cage defines the axial sliding path of the valve core, and the circular holes on the side wall of the valve cage are evenly distributed circumferentially along the sliding path of the valve core.

[0017] This utility model has the following beneficial effects: 1. This utility model solves the problem in the prior art where, when a pressure protection valve releases pressure under high pressure differential, the fluid directly impacts the valve core, easily causing severe cavitation, vibration, and noise. This is achieved by setting a valve cage with several round holes in the valve body and allowing the valve core to slide within the valve cage. The technical effects of this invention are stable pressure release, dissipation of fluid energy, and protection of the valve and pipeline system.

[0018] 2. This utility model integrates a scraper with radial thrust provided by a spring on the valve core. The reciprocating motion of the valve core drives the scraper to scrape the inner wall of the valve cage. This solves the problem in the prior art that fluid impurities easily adhere to and accumulate on the mating surface between the valve core and the valve body, causing the valve core to jam or the sealing surface to be damaged, thus affecting the reliability of the operation. It realizes online automatic cleaning of key internal components of the valve. Attached Figure Description

[0019] Figure 1 This is a perspective view of a pressure protection valve for pipeline networks proposed in this utility model. Figure 2 This is a schematic diagram of the valve body of a pressure protection valve for pipeline networks proposed in this utility model; Figure 3 This is a schematic diagram of the scraper of a pressure protection valve for pipeline networks proposed in this utility model. Figure 4 This is a schematic diagram of the valve cage of a pressure protection valve for pipeline networks proposed in this utility model. Figure 5 This is a schematic diagram of the valve core of a pressure protection valve for pipeline networks proposed in this utility model.

[0020] Legend: 1. Valve body; 2. Valve stem; 3. Flow port; 4. First spring; 5. Anti-gas component; 501. Valve cage; 502. Circular hole; 503. First sealing gasket; 504. Second sealing gasket; 6. Valve core; 7. Cleaning component; 701. Scraper; 702. Receiving groove; 703. Second spring; 704. Slag container. Detailed Implementation

[0021] 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.

[0022] Reference Figures 1-5 The present invention provides an embodiment of a pressure protection valve for pipeline networks, comprising a valve body 1, which serves as the mounting housing for the entire device. The valve body 1 has a flow port 3 for fluid to pass through inside. An anti-gas component 5 is also fixedly installed inside the valve body 1. The anti-gas component 5 includes a hollow valve cage 501, which is fixed inside the valve body 1 and surrounds the flow port 3. Several circular holes 502 are opened on the side wall of the valve cage 501. These circular holes 502 are evenly distributed along the circumference of the valve cage 501. The inner cavity of the valve cage 501 defines a sliding path for the valve core 6 to move up and down. The valve core 6 is slidably fitted into the inner cavity of the valve cage 501. The valve core 6 is used to selectively block the flow port 3 at different axial positions. The upper end of the valve core 6 is connected to the lower end of the valve stem 2 by a fixed connection. The upper end of the valve stem 2 is connected to a first spring 4. The first spring 4 is sleeved on the outer periphery of the valve stem 2. The two ends of the first spring 4 abut against the upper flange of the valve stem 2 and the inner wall of the valve body 1, respectively, to provide a continuous downward restoring force for the valve core 6. A cleaning component 7 is integrated on the valve core 6. The cleaning component 7 works in conjunction with the reciprocating motion of the valve core 6 to achieve online automatic cleaning of the inner wall of the valve cage 501. The cleaning component 7 includes a scraper 701 and a second spring 703. A receiving groove 702 for accommodating the scraper 701 is provided on the outer wall of the valve core 6. The scraper 701 is installed in the receiving groove 702 by a sliding connection. The second spring 703 is located inside the receiving groove 702. One end of the second spring 703 is fixed inside the valve core 6, and the other end is fixed to the side wall of the scraper 701. The second spring 703 is a compression spring. The direction of the elastic force of the second spring 703 is perpendicular to the sliding axis of the valve core 6, thereby continuously pushing the scraper 701 outward from the radial direction, so that the edge of the scraper 701 can always be closely attached to the inner wall of the valve cage 501. With each up and down movement of the valve core 6, the scraper 701 will scrape the inner wall of the valve cage 501 and the edge of the round hole 502. The anti-gas component 5 also includes a first sealing gasket 503 disposed at the bottom of the valve cage 501. The first sealing gasket 503 is disposed around the flow port 3, and a second sealing gasket 504 is disposed at the bottom of the valve core 6. In the assembled state, when the valve core 6 moves to the closed position blocking the flow port 3 under the action of the first spring 4, the second sealing gasket 504 at the bottom of the valve core 6 will press and adhere to the first sealing gasket 503 at the bottom of the valve cage 501 to form a reliable sealing interface. To achieve a higher level of sealing effect, the first sealing gasket 503 and the second sealing gasket 504 are made of a combination of hard and soft materials. For example, the first sealing gasket 503 is made of hard alloy material to provide support and wear resistance, while the second sealing gasket 504 is made of elastic sealing material to compensate for minor unevenness of the contact surface. This dual sealing structure of hard and soft materials ensures high airtightness and zero leakage capability of the valve in the closed state. Meanwhile, in order to effectively manage the impurities scraped off by the cleaning component 7, a slag-collecting groove 704 is also provided on the valve core 6. The slag-collecting groove 704 is located below the scraper 701. Specifically, the slag-collecting groove 704 is an annular groove opened along the outer periphery of the valve core 6. When the scraper 701 moves upward to scrape off the impurities, the scraped impurities will fall into the slag-collecting groove 704 below, which avoids the accumulation of impurities between the sliding mating surfaces of the valve core 6 and the valve cage 501, thereby preventing the occurrence of jamming. When the valve is opened to release pressure later, the impurities in the slag-collecting groove 704 will be carried away by the high-speed fluid and discharged from the valve body 1. As a preferred embodiment, in order to improve the scraping efficiency of the cleaning component 7, the working edge of the scraper 701 that is used to closely adhere to the inner wall of the valve cage 501 is blade-shaped. This blade-shaped structure can more effectively cut and scrape off the hard scale or deposits attached to the inner wall of the valve cage 501 and the edge of the round hole 502, ensuring the cleaning effect. As another preferred embodiment, in order to ensure that the scraper 701 can obtain a continuous and stable radial thrust, the second spring 703 is preferably a compression spring, and the installation direction of the second spring 703 is such that the direction of its elastic force is perpendicular to the sliding axis of the valve core 6. This arrangement ensures that the energy of the second spring 703 is converted into radial positive pressure on the scraper 701 in the most efficient way, so that it always reliably fits against the inner wall of the valve cage 501. As another preferred embodiment, in order to optimize the energy dissipation effect of the fluid during the pressure relief process, the circular holes 502 on the valve cage 501 are evenly distributed circumferentially along the sliding path of the valve core 6. When the high-pressure fluid enters the valve cage 501, it will be evenly distributed to each circular hole 502 to form multiple fine jets. These jets collide and counteract each other in the central area of ​​the valve cage 501, thereby drastically consuming the fluid energy at the microscale, effectively avoiding the formation of macroscopic cavitation, and significantly reducing cavitation, vibration and noise.

[0023] Working principle: Under normal working conditions, when the pipeline pressure is lower than the set value, the valve core 6, under the downward pressure provided by the first spring 4, has its second sealing gasket 504 at the bottom of the valve core 6 tightly fitted with the first sealing gasket 503 at the bottom of the valve cage 501, and the flow port 3 is in the closed state, keeping the valve sealed.

[0024] When the pipeline pressure exceeds the set value, the fluid thrust acting on the bottom of the valve core 6 overcomes the preload of the first spring 4, pushing the valve core 6 and valve stem 2 upward together. The valve core 6 leaves the bottom sealing surface of the valve cage 501, the flow port 3 is opened, and the high-pressure fluid begins to be released. The fluid first enters the inner cavity of the valve cage 501, and then is divided into multiple fine jets by several round holes 502 on the side wall of the valve cage 501. These jets impact each other and consume energy in the central area of ​​the valve cage 501, thereby effectively suppressing the occurrence of cavitation and reducing noise and vibration.

[0025] As the valve core 6 moves upward, the cleaning component 7, which is integrated with the valve core 6, also moves. Under the radial thrust of the second spring 703, the scraper 701 scrapes upward against the inner wall of the valve cage 501 with its blade-shaped edge, removing impurities, scale, etc. attached to the inner wall and the edge of the round hole 502. The scraped-off impurities fall into the slag-holding groove 704 below the scraper 701.

[0026] Once the pipeline pressure drops to a safe level, the elastic force of the first spring 4 takes over again, pushing the valve core 6 and valve stem 2 downwards until the second sealing gasket 504 and the first sealing gasket 503 are in contact again, closing the flow port 3. During the downward reset of the valve core 6, the scraper 701 scrapes the inner wall of the valve cage 501 again in reverse, further ensuring the cleaning effect. The impurities collected in the slag container 704 will be carried away by the high-speed fluid and discharged from the valve body 1 when the valve is opened to release pressure next time. This achieves the online self-cleaning function of the key mating surfaces inside the valve, ensuring the reliability of the valve's long-term operation.

Claims

1. A pressure protection valve for pipeline networks, comprising: Valve body (1), the valve body (1) is provided with a flow port (3); Gas-resistant assembly (5), the gas-resistant assembly (5) includes a valve cage (501) fixed inside the valve body (1) and surrounding the flow port (3), and a plurality of round holes (502) are provided on the side wall of the valve cage (501). Valve core (6), which is slidably fitted into the inner cavity of the valve cage (501), is used to selectively block the flow port (3) at different axial positions. Valve stem (2), the lower end of which is fixedly connected to the valve core (6); The first spring (4) is sleeved on the outer periphery of the valve stem (2), and its two ends abut against the upper flange of the valve stem (2) and the inner wall of the valve body (1), respectively. The feature is that it also includes a cleaning component (7) integrated with the valve core (6); The cleaning component (7) includes a scraper (701) and a second spring (703). The outer wall of the valve core (6) is provided with a receiving groove (702) for the scraper (701) to be received. The scraper (701) is slidably connected in the receiving groove (702). The second spring (703) is disposed inside the receiving groove (702). One end of the second spring (703) is fixed inside the valve core (6), and the other end is fixed to the side wall of the scraper (701) for continuously pushing the edge of the scraper (701) to press against the inner wall of the valve cage (501).

2. The pressure protection valve for pipeline networks according to claim 1, characterized in that, The anti-gas component (5) also includes a first sealing gasket (503) disposed at the bottom of the valve cage (501), and a second sealing gasket (504) is disposed at the bottom of the valve core (6). When the valve core (6) moves to the position of blocking the flow port (3), the second sealing gasket (504) and the first sealing gasket (503) press against each other.

3. The pressure protection valve for pipelines according to claim 2, characterized in that, The first sealing gasket (503) and the second sealing gasket (504) are made of a combination of hard and soft materials.

4. The pressure protection valve for pipeline networks according to claim 1, characterized in that, The valve core (6) is also provided with a slag-collecting groove (704), which is located below the scraper (701) and is used to collect the impurities scraped off by the scraper (701).

5. The pressure protection valve for pipelines according to claim 4, characterized in that, The slag-holding groove (704) is an annular groove formed along the outer periphery of the valve core (6).

6. The pressure protection valve for pipeline networks according to claim 1, characterized in that, The edge of the scraper (701) that is close to the inner wall of the valve cage (501) is blade-shaped.

7. The pressure protection valve for pipeline networks according to claim 1, characterized in that, The second spring (703) is a compression spring, and the direction of its elastic force is perpendicular to the sliding axis of the valve core (6).

8. The pressure protection valve for pipeline networks according to claim 1, characterized in that, The inner cavity of the valve cage (501) defines the axial sliding path of the valve core (6), and the circular holes (502) are evenly distributed circumferentially along the sliding path of the valve core (6).

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