Stop valve and fire extinguishing system

Abstract

The invention relates to the technical field of lift valves and cut-off devices with closing elements, in particular to a stop valve and a fire extinguishing system. The stop valve comprises a valve body, a medium channel is formed in the valve body, a valve seat is arranged on the medium channel, the valve seat is correspondingly provided with a valve clack in a matched mode, the valve clack is installed in the valve body and right faces a valve port of the valve seat, a sealing ring is detachably installed on the side, facing the valve seat, of the valve clack, and a sealing protrusion right faces the sealing ring is arranged on the valve seat. The width of at least one end, close to the sealing ring, of the sealing protrusion is smaller than that of the sealing ring, and the two sides, in the width direction, of the sealing ring protrude out of the sealing protrusion. According to the stop valve, it is guaranteed that no gap exists between the sealing ring and the sealing protrusion, and effective contact sealing between the valve clack and the valve seat is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of a lifting valve and a cutting device with a closing element, and in particular to a stop valve and a fire protection system. Background Art

[0002] In emergency situations such as fire, the fire protection system needs to respond quickly and effectively. The working principle of the stop valve is to rely on the valve stem pressure to make the valve disc sealing surface fit closely with the valve seat sealing surface, thereby preventing the medium from flowing. At the same time, the stop valve can be opened quickly to allow water to flow quickly in the stop valve, thereby ensuring an effective fire protection water source. Therefore, the stop valve is often used in the fire protection system. The stop valve mainly includes a valve disc, a valve body and a valve stem. The valve disc is used as the opening and closing part of the stop valve. When it is necessary to cut off or throttle the medium in the pipeline, the valve disc is driven up and down by the valve stem to achieve the purpose of opening or closing the valve. In the working process of the stop valve, its sealing structure is the key part to ensure that the stop valve can work normally. Traditional stop valves generally adopt a mechanical grinding hard sealing structure, that is, the sealing surface of the valve disc and the valve seat can fit closely to each other after high-precision grinding to achieve good sealing performance, but it is difficult to maintain. It requires a special person to carry special tools to grind the sealing surface. Improper protection can easily cause damage to the sealing surface, resulting in the inability of the valve disc sealing surface to fit closely with the valve seat sealing surface, and the seal fails.

[0003] In response to the above problems, the prior art improves the mechanically ground hard sealing structure into an elastic soft sealing structure. For example, the Chinese invention patent application with application publication number CN115574107A and application publication date 2023.01.06 discloses a stop valve sealing structure and a stop valve, the stop valve sealing structure includes a valve seat, a valve disc and an elastic sealing ring, the valve seat is provided with a cavity, the valve disc slides in the cavity of the valve seat, the end face of the valve seat relative to the valve disc is a stepped surface, the elastic sealing ring is connected to one of the valve seat and the valve disc, the sealing between the valve disc and the valve seat is achieved by the elastic sealing ring, when the elastic sealing ring is connected to the valve disc, a locking sleeve is sleeved on the valve disc, the locking sleeve is fixed to the valve disc by bolts, and an opening is formed between the locking sleeve and the valve disc. The elastic sealing ring can be slidably fitted in the annular cavity or tightly fitted in the annular cavity towards the valve seat, and the end of the elastic sealing ring extends out of the annular cavity. A boss opposite to the elastic sealing ring is arranged on the step surface. When the elastic sealing ring is slidably fitted in the annular cavity, the valve stem drives the valve disc to move in the direction close to the valve seat, and the elastic sealing ring first contacts with the boss, and then the elastic sealing ring is pushed by the boss to contact with the annular cavity and pressed tightly, thereby realizing the sealing of the valve disc and the valve seat; when the elastic sealing ring is tightly fitted with the annular cavity, the valve stem drives the valve disc to move in the direction close to the valve seat, and the elastic sealing ring contacts with the boss and presses tightly, thereby realizing the sealing of the valve disc and the valve seat.

[0004] In the above sealing structure, the elastic sealing ring contacts the boss to achieve sealing, but the width of the boss is larger than the width of the elastic sealing ring, so that a surface-to-surface contact seal is formed between the boss and the elastic sealing ring. However, when the elastic sealing ring is separated from the boss, the medium flows in the inner cavity of the valve seat and flushes the boss on the valve seat. Impurity particles in the medium are likely to remain on the boss. When the elastic sealing ring contacts the boss again, these impurity particles will cause gaps in the contact sealing surface between the elastic sealing ring and the boss, resulting in a loose seal. Impurity particles stuck on the sealing surface for a long time will also damage the sealing surface, resulting in failure of the seal between the valve disc and the valve seat, and then the stop valve cannot effectively cut off the medium. When used in a fire protection system, an effective fire water source cannot be guaranteed. Summary of the invention

[0005] The purpose of the present invention is to provide a stop valve, which aims to solve the problem that residual impurities and particles cause gaps or damage to the sealing surface, resulting in poor sealing or sealing failure between the valve disc and the valve seat. At the same time, the purpose of the present invention is also to provide a fire protection system, which solves the problem that an effective fire protection water source cannot be guaranteed when the fire protection system is used by using the stop valve.

[0006] To achieve the above purpose, the stop valve of the present invention adopts the following technical solutions: A stop valve comprises a valve body, wherein a medium channel is arranged in the valve body, a valve seat is arranged on the medium channel, a valve disc is matched with the valve seat, the valve disc is installed in the valve body and faces the valve opening of the valve seat, a sealing ring is detachably installed on the side of the valve disc facing the valve seat, a sealing protrusion facing the sealing ring is arranged on the valve seat, a width of at least one end of the sealing protrusion close to the sealing ring is smaller than a width of the sealing ring, and both sides of the sealing ring in the width direction protrude from the sealing protrusion.

[0007] Furthermore, a sealing ring pressing plate is installed on the side of the valve disc facing the valve seat, and the sealing ring pressing plate presses and fixes the sealing ring on the valve disc.

[0008] Furthermore, a sealing ring step is provided on the edge of the inner ring or the outer ring of the sealing ring on the side facing the valve seat, and the corresponding edge of the sealing ring pressure plate is embedded in the sealing ring step.

[0009] Furthermore, the sealing ring step is arranged at the inner ring of the sealing ring, and the valve disc is provided with an outer ring stop surface which cooperates with the outer peripheral surface of the sealing ring step.

[0010] Furthermore, a cross section of the sealing protrusion in the width direction gradually decreases from one end away from the valve disc to the other end.

[0011] Furthermore, the outer peripheral surface of the sealing protrusion is an inclined surface, which gradually inclines toward the center of the sealing protrusion from one end away from the valve disc to the other end.

[0012] Furthermore, an end surface of the sealing protrusion close to one end of the valve disc is an arc surface.

[0013] Furthermore, the arc surface is a polished surface.

[0014] Furthermore, the sealing ring pressure plate is detachably connected to the valve disc via countersunk screws.

[0015] Beneficial effects: The stop valve of the present invention is an improved invention. By arranging a sealing ring on the side opposite to the valve seat of the stop valve, and arranging a sealing protrusion on the valve seat corresponding to the sealing ring, the contact seal between the valve disc and the valve seat can be achieved through the compression fit of the sealing ring and the sealing protrusion, thereby cutting off the medium channel; the width of the sealing protrusion is set to be smaller than the width of the sealing ring, and when the sealing ring and the sealing protrusion are compressed and matched, both sides of the sealing ring in the width direction protrude from the sealing protrusion, so that when the sealing ring and the sealing protrusion are compressed and matched, the sealing ring can form a tight surrounding and wrapping of the sealing protrusion, ensuring that there is no gap between the sealing ring and the sealing protrusion, and ensuring effective contact sealing between the valve disc and the valve seat.

[0016] The fire fighting system of the present invention adopts the following technical solutions: A fire protection system includes a stop valve, which includes a valve body. A medium channel is provided in the valve body, a valve seat is provided on the medium channel, a valve disc is provided corresponding to the valve seat, the valve disc is installed in the valve body and is arranged opposite to the valve opening of the valve seat, a sealing ring is detachably installed on the side of the valve disc facing the valve seat, a sealing protrusion is provided on the valve seat and is opposite to the sealing ring, a width of at least one end of the sealing protrusion close to the sealing ring is smaller than a width of the sealing ring, and both sides of the sealing ring in the width direction protrude from the sealing protrusion.

[0017] Furthermore, a sealing ring pressing plate is installed on the side of the valve disc facing the valve seat, and the sealing ring pressing plate presses and fixes the sealing ring on the valve disc.

[0018] Furthermore, a sealing ring step is provided on the edge of the inner ring or the outer ring of the sealing ring on the side facing the valve seat, and the corresponding edge of the sealing ring pressure plate is embedded in the sealing ring step.

[0019] Furthermore, the sealing ring step is arranged at the inner ring of the sealing ring, and the valve disc is provided with an outer ring stop surface which cooperates with the outer peripheral surface of the sealing ring step.

[0020] Furthermore, a cross section of the sealing protrusion in the width direction gradually decreases from one end away from the valve disc to the other end.

[0021] Furthermore, the outer peripheral surface of the sealing protrusion is an inclined surface, which gradually inclines toward the center of the sealing protrusion from one end away from the valve disc to the other end.

[0022] Furthermore, an end surface of the sealing protrusion close to one end of the valve disc is an arc surface.

[0023] Furthermore, the arc surface is a polished surface.

[0024] Furthermore, the sealing ring pressure plate is detachably connected to the valve disc via countersunk screws.

[0025] Beneficial effects: The fire protection system of the present invention is an improved invention. By arranging a sealing ring on the side opposite to the valve seat of the stop valve, and arranging a sealing protrusion on the valve seat corresponding to the sealing ring, the contact seal between the valve disc and the valve seat can be achieved through the compression fit of the sealing ring and the sealing protrusion, thereby cutting off the medium channel; the width of the sealing protrusion is set to be smaller than the width of the sealing ring, and when the sealing ring and the sealing protrusion are compressed and matched, both sides of the sealing ring in the width direction protrude from the sealing protrusion, so that when the sealing ring and the sealing protrusion are compressed and matched, the sealing ring can form a tight surround and wrap around the sealing protrusion, ensuring that there is no gap between the sealing ring and the sealing protrusion, ensuring effective contact sealing between the valve disc and the valve seat, and realizing the effective cutting off of the medium in the medium channel by the stop valve, thereby ensuring that the stop valve can provide an effective fire-fighting water source when used in the fire protection system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the connection structure between the sealing ring on the valve disc and the sealing protrusion on the valve seat in a contact sealing state in one embodiment of the stop valve of the present invention; Figure 2 It is a structural schematic diagram of an embodiment of the stop valve of the present invention; Figure 3 It is a structural schematic diagram of a stop valve in a cut-off state in an embodiment of a fire protection system of the present invention; Figure 4 It is a structural schematic diagram of a stop valve in a flow state in an embodiment of a fire protection system of the present invention; Figure 5 It is a left-side structural schematic diagram of an embodiment of the fire protection system of the present invention.

[0027] In the figure: 1. valve body; 2. medium channel; 3. valve seat; 4. valve disc; 5. sealing ring; 6. sealing protrusion; 7. sealing ring pressure plate; 8. sealing ring step; 9. countersunk screw; 10. elastic gasket; 11. valve stem; 12. center hole; 13. driving mechanism; 14. water inlet chamber; 15. water outlet chamber; 16. pressure plate; 17. sealing gasket; 18. pressure plate matching plate; 19. buffer pad. DETAILED DESCRIPTION

[0028] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0029] As the opening and closing control valve of the main pipeline of the fire protection system, the stop valve needs to be opened quickly when a fire accident occurs, and the high-pressure water flow is delivered to the main pipeline and sprayed out to extinguish the fire accident. When the stop valve is in a locked state, in order to avoid the pressure relief or leakage of the high-pressure water flow, the sealing performance of the stop valve needs to be guaranteed. At present, a contact seal is often achieved by setting an elastic soft sealing structure between the valve disc and the valve seat of the stop valve. The elastic soft sealing structure in the prior art is achieved by an elastic sealing ring and a protrusion set for the elastic sealing ring. However, this structure forms a surface-to-surface contact, and the contact sealing surface is easily damaged by impurity particles in the medium. In order to avoid the impurity particles from damaging the sealing surface, the surface-to-surface contact form can be improved to a point-to-surface contact form, which can further improve the sealing effect. Based on the above invention concept, the present invention proposes a stop valve and a fire protection system. By setting the sealing ring to have a width greater than the width of the protrusion, the sealing ring can surround and tightly wrap the protrusion, ensuring that no gap is generated between the sealing ring and the protrusion, and achieving effective contact sealing between the sealing ring and the protrusion.

[0030] Embodiments of the stop valve of the present invention: See also Figure 1 to Figure 2 As a basic embodiment of the present invention, the stop valve includes a valve body 1, a medium channel 2 is provided in the valve body 1, a valve seat 3 is provided on the medium channel 2, a valve flap 4 is provided corresponding to the valve seat 3, the valve flap 4 is installed in the valve body 1 and is arranged opposite to the valve port of the valve seat 3, a sealing ring 5 is detachably installed on the side of the valve flap 4 facing the valve seat 3, a sealing protrusion 6 opposite to the sealing ring 5 is provided on the valve seat 3, and when the sealing ring 5 is pressed and matched with the sealing protrusion 6, a contact seal between the valve flap 4 and the valve seat 3 can be achieved, thereby The channel 2 is cut off, and the width of at least one end of the sealing protrusion 6 close to the sealing ring 5 is smaller than the width of the sealing ring 5. Both sides of the sealing ring 5 in the width direction protrude from the sealing protrusion 6. Then, when the sealing ring 5 and the sealing protrusion 6 are pressed together, the sealing ring 5 will undergo elastic deformation consistent with the shape of the sealing protrusion 6. The sealing ring 5 can form a tight surround and wrap around the sealing protrusion 6, ensuring that there is no gap between the sealing ring 5 and the sealing protrusion 6, thereby ensuring effective contact sealing between the valve disc 4 and the valve seat 3.

[0031] As a preferred embodiment of the present invention, a sealing ring pressing plate 7 is installed on the side of the valve disc 4 facing the valve seat 3, and the sealing ring 5 is pressed and fixed on the valve disc 4 by the sealing ring pressing plate 7. When the sealing ring pressing plate 7 and the sealing ring 5 are pressed together, the sealing ring 5 is subjected to the pressing force of the sealing ring pressing plate 7 in the axial direction, so that no gap is generated between the sealing ring 5 and the valve disc 4, thereby effectively preventing the sealing ring 5 from falling off the valve disc 4, and ensuring the effective contact seal between the valve disc 4 and the valve seat 3.

[0032] As a preferred embodiment of the present invention, the inner ring or outer ring edge of the sealing ring 5 is provided with a sealing ring step 8 on the side facing the valve seat 3, and the corresponding edge of the sealing ring pressing plate 7 is embedded in the sealing ring step 8. At this time, the side of the sealing ring pressing plate 7 facing the valve seat 3 is flush with the side of the valve disc 4 facing the valve seat 3. Such a setting can increase the contact area between the sealing ring pressing plate 7 and the sealing ring 5, reduce the contact area between the sealing ring pressing plate 7 and the medium in the valve body 1, and thus delay the corrosion of the sealing ring pressing plate 7 by the medium, so that the sealing ring pressing plate 7 and the sealing ring 5 are in contact with each other. The sealing effect of the contact part of the sealing ring 5 can be maintained for a long time; in addition, when the valve disc 4 moves in the direction away from the valve seat 3, the side of the sealing ring pressing plate 7 facing the valve seat 3 is set to be flush with the side of the valve disc 4 facing the valve seat 3, which can ensure that the medium flows through the medium channel 2 as soon as the valve disc 4 is separated from the valve seat 3, avoiding the sealing ring pressing plate 7 from blocking the flow of the medium; in addition, when the sealing ring step 8 and the sealing ring pressing plate 7 are not provided, the sealing ring 5 contacts and seals with the sealing protrusion 6, and the distance for the sealing ring 5 to deform is Figure 1 In L1, after the sealing ring step 8 is set and the sealing ring pressing plate 7 is installed into the sealing ring step 8, the sealing ring 5 contacts and seals with the sealing protrusion 6, and the distance that the sealing ring 5 is deformed is Figure 1 In comparison, setting a sealing ring step 8 matched with the sealing ring pressure plate 7 can reduce the size of the deformed portion of the sealing ring 5. The larger the size of the deformed portion, the lower the rigidity of the sealing ring 5, and the more likely it is that the sealing surface formed by the sealing ring 5 and the sealing protrusion 6 will leak, which is not conducive to maintaining the sealing effect for a long time under high pressure conditions. Therefore, the setting of the sealing ring step 8 can reduce the elastic deformation of the sealing ring 5 and increase the rigidity of the sealing ring 5, which is conducive to the sealing surface formed by the sealing ring 5 and the sealing protrusion 6 under high pressure conditions to maintain a good sealing effect for a long time.

[0033] As a preferred embodiment of the present invention, the sealing ring step 8 is arranged at the inner ring of the sealing ring 5, and the valve disc 4 is provided with an outer ring stop surface that stops and cooperates with the outer peripheral surface of the sealing ring step 8. At this time, the outer ring of the sealing ring 5 also contacts and cooperates with the outer ring stop surface of the valve disc 4, thereby increasing the contact area and contact friction between the sealing ring 5 and the valve disc 4. In other embodiments, the sealing ring step 8 can also be arranged at the outer ring of the sealing ring 5, and the sealing ring pressure plate 7 is also located at the outer ring of the sealing ring 5, forming a tight fit with the sealing ring step 8. In other embodiments, the sealing ring step 8 can also be arranged at both the inner ring and the outer ring of the sealing ring 5, thereby further increasing the contact and tightness effect of the sealing ring pressure plate 7 on the sealing ring 5.

[0034] As a preferred embodiment of the present invention, the cross-section of the sealing protrusion 6 in the width direction gradually decreases from one end away from the valve disc 4 to the other end, that is, the cross-sectional area of ​​the end of the sealing protrusion 6 close to the valve disc 4 is smaller than the cross-sectional area of ​​the end of the sealing protrusion 6 away from the valve disc 4. Such a configuration can make the contact form between the sealing protrusion 6 and the sealing ring 5 point-to-face contact, so that when the sealing ring 5 is pressed against the sealing protrusion 6, the sealing ring 5 surrounds and tightly wraps the sealing protrusion 6.

[0035] As a preferred embodiment of the present invention, the outer peripheral surface of the sealing protrusion 6 is an inclined surface, which gradually inclines toward the center of the sealing protrusion 6 from one end away from the valve disc 4 to the other end. In this embodiment, the outer peripheral surface of the sealing protrusion 6 is set to a draft angle of 30°, which can effectively improve the structural strength and bearing capacity of the sealing part. In other embodiments, the outer peripheral surface of the sealing protrusion 6 can also be set to other inclined angles, as long as the sealing effect between the sealing protrusion 6 and the sealing ring 5 can be guaranteed.

[0036] As a preferred embodiment of the present invention, the end face of the sealing protrusion 6 close to the valve disc 4 is an arc surface. Such a configuration can prevent the sealing ring 5 from being squeezed and damaged or acting on the sealing ring 5 for a long time so as to cut off the sealing ring 5 when the end of the sealing protrusion 6 close to the valve disc 4 is pressed together with the sealing ring 5. At the same time, the contact area and contact friction between the sealing protrusion 6 and the sealing ring 5 can be increased, which makes it easier for the sealing ring 5 to surround and wrap the sealing protrusion 6 and improve the sealing effect.

[0037] As a preferred embodiment of the present invention, the arc surface is a polished surface, that is, the end surface of the sealing protrusion 6 close to the valve disc 4 is relatively smooth, and will not cause extrusion damage to the sealing ring 5 when in contact with the sealing ring 5 for a long time, and the contact sealing and wrapping tightness with the sealing ring 5 are good.

[0038] As a preferred embodiment of the present invention, the sealing ring pressure plate 7 is detachably connected to the valve disc 4 by a countersunk screw 9, and an elastic gasket 10 is also provided between the sealing ring pressure plate 7 and the countersunk screw 9, and the sealing ring pressure plate 7 and the elastic gasket 10 are both sleeved on the outer circumferential surface of the countersunk screw 9, and the countersunk screw 9 is threadedly connected to the valve disc 4. When the countersunk screw 9 is fully screwed into the valve disc 4, the sealing ring pressure plate 7 is pressed and matched with the sealing ring 5, and the elastic gasket 10 can isolate the sealing ring pressure plate 7 from the countersunk screw 9. In the process of the countersunk screw 9 being screwed into the valve disc 4, the countersunk screw 9 can be prevented from directly pressing on the sealing ring pressure plate 7 and causing wear to the sealing ring pressure plate 7. At the same time, as the countersunk screw 9 is gradually screwed in, the sealing ring pressure plate 7 will gradually move to contact with the sealing ring 5 and apply axial pressing force to the sealing ring 5, thereby realizing the contact, pressing and positioning of the sealing ring pressure plate 7 on the sealing ring 5, and effectively preventing the sealing ring 5 from falling off.

[0039] As a preferred embodiment of the present invention, the sealing protrusion 6 and the valve seat 3 are integrally formed and processed, and such a configuration can improve the integrity of the sealing protrusion 6 and the valve seat 3, and there is no need to separately process and install the sealing protrusion 6. In other embodiments, the sealing protrusion 6 can also be separately processed and fixedly connected to the valve seat 3 by welding or other connecting structures, as long as the sealing protrusion 6 and the valve seat 3 can be firmly connected.

[0040] As a preferred embodiment of the present invention, the stop valve also includes a valve stem 11, a center hole 12 is provided on the valve disc 4, one end of the valve stem 11 is fitted in the center hole 12, and the other end of the valve stem 11 is used to connect with the driving mechanism 13. The valve stem 11 is used to receive the locking force of the driving mechanism 13 and to press the sealing ring 5 on the valve disc 4 onto the sealing protrusion 6 on the valve seat 3, thereby ensuring effective contact sealing between the valve disc 4 and the valve seat 3, and realizing the effective cutting off or flow of the medium by the stop valve.

[0041] The use process of the stop valve of the present invention is as follows: the stop valves are all three-way structures, both sides of which are flange structures, and can be connected and positioned with other devices through the flange structure. The medium channel 2 of the stop valve includes an inlet chamber 14 and an outlet chamber 15, and the inlet chamber 14 and the outlet chamber 15 are located on both sides of the valve seat 3. The inlet chamber 14 is used to be connected with a water source or other medium source. When the stop valve is in a locked state, the valve disc 4 contacts and seals with the valve seat 3, and the water source or other medium source in the inlet chamber 14 cannot reach the outlet chamber 15, thereby ensuring the cutting off of the water source or other medium source. When the stop valve is in use, the driving mechanism 13 is first energized, and the water source or other medium source will lift the valve disc 4 to separate from the valve seat 3. At this time, the water source or other medium source in the inlet chamber 14 can flow into the outlet chamber 15, thereby realizing the circulation of the water source or other medium source in the medium channel 2. After use, the valve stem 11 and the valve disc 4 move downward under the action of their own gravity until the valve disc 4 contacts and seals with the valve seat 3, and the stop valve returns to the locked state again.

[0042] Embodiments of the fire fighting system of the present invention: See also Figures 3 to 5 , a fire protection system includes a driving mechanism 13 and the above-mentioned stop valve, the driving mechanism 13 is fixedly connected to the valve body 1 of the stop valve by threaded fasteners and a pressure plate 16 is clamped between the two, the pressure plate 16 is sealed with the valve body 1, and the valve stem 11 of the stop valve passes through the pressure plate 16 and is connected to the driving mechanism 13, the valve stem 11 is used to receive the locking force of the driving mechanism 13 and press the sealing ring 5 on the valve disc 4 onto the sealing protrusion 6 on the valve seat 3, so as to realize the effective cutting off or circulation of the medium by the stop valve, thereby ensuring that the stop valve can provide an effective fire protection water source when used in the fire protection system.

[0043] The working process of the stop valve driven by the driving mechanism 13 is specifically as follows: the driving mechanism 13 is equipped with a built-in pressure regulating and locking mechanism. When the valve disc 4 contacts the valve seat 3, the pressure regulating and locking mechanism can press the sealing ring 5 against the sealing protrusion 6 through the valve stem 11, thereby realizing effective contact sealing between the valve disc 4 and the valve seat 3; in addition, the pressure plate 16 and the valve body 1 are sealed and connected by a sealing gasket 17 to ensure good sealing between the valve body 1 and the driving mechanism 13. At this time, a pressure plate matching plate 18 is arranged on the outer peripheral surface of the valve stem 11, and a buffer pad 19 is installed on the pressure plate matching plate 18. When the valve stem 11 and the valve disc 4 move in a direction away from the valve seat 3, the pressure plate matching plate 18 will approach the pressure plate 16 until it contacts the pressure plate 16. During this process, the buffer pad 19 is located between the pressure plate 16 and the pressure plate matching plate 18 and can reduce the impact force between the valve stem 11 and the pressure plate 16, thereby providing protection for both the valve stem 11 and the pressure plate 16.

[0044] The use process of the fire fighting system of the present invention is as follows: the water inlet chamber 14 of the stop valve is connected to the fire fighting main pipeline, and the water outlet chamber 15 is connected to the fire fighting pipe network. When the fire fighting system is in the daily duty state, the fire fighting main pipeline will continuously provide a high-pressure fire fighting water source to the water inlet chamber 14, the driving mechanism 13 is in the power-off state and the valve stem 11 is locked by the pressure regulating locking mechanism, the valve disc 4 connected to the valve stem 11 is always in contact and sealed with the valve seat 3, and the stop valve is in the cut-off state, so the water outlet chamber 15 is always in a water-free state; when a fire accident occurs .... Mechanism 13 is energized, the pressure-adjusting locking mechanism releases the lock on the valve stem 11, and the valve flap 4 moves upward under the pressure of the high-pressure fire water source. The high-pressure fire water source flows from the water inlet chamber 14 to the water outlet chamber 15, and the fire-fighting pipe network implements fire extinguishing. After the fire-fighting is completed, the supply of high-pressure fire water source in the fire main pipeline is closed, and the valve stem 11 and the valve flap 4 move downward under the action of their own gravity until the valve flap 4 contacts the valve seat 3. At this time, the sealing ring 5 is pressed against the sealing protrusion 6 by the pressure-adjusting locking mechanism again to maintain the sealing state.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A stop valve, comprising a valve body, a medium channel is provided in the valve body, a valve seat is provided on the medium channel, a valve disc is provided corresponding to the valve seat, the valve disc is installed in the valve body and is arranged opposite to the valve port of the valve seat, a sealing ring is detachably installed on the side of the valve disc facing the valve seat, a sealing protrusion opposite to the sealing ring is provided on the valve seat, and the characteristics are: The width of at least one end of the sealing protrusion close to the sealing ring is smaller than the width of the sealing ring, and both sides of the sealing ring in the width direction protrude from the sealing protrusion.

2. The stop valve according to claim 1, characterized in that: A sealing ring pressing plate is installed on the side of the valve disc facing the valve seat, and the sealing ring pressing plate presses and fixes the sealing ring on the valve disc.

3. The stop valve according to claim 2, characterized in that: The inner ring or outer ring edge of the sealing ring is provided with a sealing ring step on the side facing the valve seat, and the corresponding edge of the sealing ring pressure plate is embedded in the sealing ring step.

4. The stop valve according to claim 3, characterized in that: The sealing ring step is arranged at the inner ring of the sealing ring, and the valve disc is provided with an outer ring stop surface which is matched with the outer peripheral surface of the sealing ring step.

5. The stop valve according to any one of claims 1 to 4, characterized in that: The cross section of the sealing protrusion in the width direction gradually decreases from one end away from the valve disc to the other end.

6. The stop valve according to claim 5, characterized in that: The outer peripheral surface of the sealing protrusion is an inclined surface, which gradually inclines toward the center of the sealing protrusion from one end away from the valve disc to the other end.

7. The stop valve according to claim 1 or 6, characterized in that: The end surface of the sealing protrusion close to the valve disc is an arc surface.

8. The stop valve according to claim 7, characterized in that: The arc surface is a polished surface.

9. The stop valve according to any one of claims 2 to 4, characterized in that: The sealing ring pressing plate is detachably connected to the valve disc via countersunk screws.

10. Fire fighting system, characterized in that: The invention comprises the stop valve according to any one of claims 1 to 9.

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