An overflow valve

Abstract

The application provides an overflow valve. The first sealing ring can be sealed in a high-temperature environment and a low-temperature environment through the first sealing and the second sealing, the influence of the first sealing ring on the resistance of the valve rod in the high-temperature environment can be effectively avoided, the high-temperature performance of the overflow valve is effectively ensured, the safety and stability of a gas pressure or hydraulic system pipeline are ensured, the first sealing ring can be prevented from contacting the valve rod during switching of the overflow valve from an open state to a closed state, the valve rod can be prevented from impacting the first sealing ring during movement, the impact on the first sealing ring is effectively avoided, and the service life of the first sealing ring is ensured.

Description

Technical Field

[0001] This invention relates to the field of pressure regulating devices, specifically an overflow valve. Background Technology

[0002] Relief valves are key components ensuring the stable, efficient, and safe operation of pneumatic or hydraulic pipelines. Most existing domestic relief valves employ either a metal-to-metal conical hard seal or a soft seal involving metal, a sealing ring, and another metal component. Hard-seal relief valves have high requirements for the roughness of the inner conical surface of the valve seat and the surface of the valve core, as well as the cleanliness of the medium. All three conditions must be met simultaneously. Scratches, damage, or roughness on the inner conical surface of the valve seat or the surface of the valve core, or the presence of impurities such as iron filings in the medium, will cause the seal between the valve core and the valve seat to fail. The pressure in the fluid pipeline system will overflow and release pressure before reaching the relief valve's set value, causing the supplementary pump to continuously operate and replenish pressure. In severe cases, this can lead to the shutdown of the pneumatic or hydraulic fluid system. Furthermore, hard-seal relief valves are unsuitable for gaseous media, especially at low pressures of 0 to 3000 PSI, as the valve core cannot seal properly. Soft-seal relief valves offer superior sealing performance, exhibiting no leakage in gaseous media at low pressures from 0 to 3000 PSI. Their sealing performance is far superior to that of hard-seal relief valves. They are suitable for both gaseous and liquid media and have significantly lower requirements for the cleanliness of the medium compared to hard-seal valves.

[0003] However, the performance of the sealing ring is greatly affected by temperature and pressure. When the temperature is below -50°C, the conventional sealing ring will completely harden and lose its elasticity, failing to fill the gap between the valve stem and the valve seat to form a seal. When the temperature is high, the conventional sealing ring will soften and expand. When the valve stem is closed, the sealing ring is firmly inserted into the valve stem gap and holds the valve stem firmly, resulting in increased frictional resistance between the valve stem and the sealing ring. Consequently, a higher fluid force is required to open the valve stem and release pressure. This leads to a situation where, under the same spring force, the overflow pressure of the relief valve at high temperatures is higher than that at normal temperatures. Furthermore, the interaction between the fluid force and the spring force causes the valve stem to reciprocate axially continuously. When the valve stem opens at high temperatures, the sealing ring is easily squeezed out of the sealing ring groove due to pressure. When the valve stem returns to its original position and closes the valve, the sealing ring is repeatedly impacted and deformed by large impact forces, leading to wear or damage to the sealing ring and thus a short lifespan for the relief valve. Summary of the Invention

[0004] In view of this, the present invention provides an overflow valve to solve the problem that in existing soft-seal overflow valves, the sealing ring is easily squeezed out of the sealing ring groove, and when the valve stem resets and closes the valve, the sealing ring is repeatedly impacted and squeezed by large impact force, resulting in wear or damage to the sealing ring, which in turn leads to a short life of the overflow valve.

[0005] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] An overflow valve includes: a valve body, a valve seat, a first sealing ring, a gasket, a gland, a valve stem, a valve cap, an elastic element, and a valve end cap;

[0007] The valve body has a first channel and a second channel, wherein the second channel is perpendicularly connected to the middle of the first channel;

[0008] The end of the second channel furthest from the first channel is the overflow outlet;

[0009] One end of the first channel is the entrance;

[0010] Along the direction away from the first channel, it is divided into the first sub-channel, the second sub-channel, the third sub-channel, the fourth sub-channel and the fifth sub-channel in sequence. The diameter of the first sub-channel is smaller than that of the second sub-channel, the diameter of the second sub-channel is smaller than that of the third sub-channel, the diameter of the third sub-channel is smaller than that of the fourth sub-channel, and the fourth sub-channel is connected to the second channel.

[0011] The valve seat is located in the second sub-channel, and the valve seat has an axial third channel. On the side of the valve seat near the inlet, there are multiple connecting grooves that communicate with the third channel in the radial direction.

[0012] The pressure cap is located in the third sub-channel;

[0013] The gasket is located in the third sub-channel and between the valve seat and the gland, forming a gap between the gasket and the valve seat;

[0014] The first sealing ring is disposed between the gasket and the valve seat, wherein the first sealing ring is used to seal the gap;

[0015] The gasket also has a storage compartment on the side near the first sealing ring to accommodate the deformation of the first sealing ring.

[0016] One end of the valve cap is located within the fifth sub-channel;

[0017] The valve end cap is located at the other end of the valve cap and forms a movable cavity;

[0018] The elastic element is located in the movable cavity;

[0019] One end of the valve stem passes through the gland and gasket in sequence to engage with the third channel, while the other end extends into the valve cap and connects with the elastic element. The elastic element is used to provide elastic restoring force to the valve stem so that the end of the valve stem blocks the third channel.

[0020] Preferably, the outer diameter of the valve seat decreases in a stepped manner along the inlet direction away from the first channel;

[0021] The first sealing ring is fitted onto the valve seat.

[0022] Preferably, the gasket has an annular groove at one end near the valve seat and an outwardly protruding conical structure to form a storage position;

[0023] A gap is formed between the tapered structure and the valve seat.

[0024] Preferably, the valve stem is divided into a first section, a second section, a third section, and a fourth section along the direction away from the valve seat, wherein the diameter of the third section is larger than the diameter of the second section, the diameter of the second section is larger than the diameter of the first section, and the diameter of the fourth section is smaller than the diameter of the third section.

[0025] The diameter of the second segment is the same as that of the third channel;

[0026] The gland is fitted onto the third section of the valve stem;

[0027] A fourth, fifth, and sixth channel are sequentially provided along the axial direction of the valve cap. The inner diameter of the fourth channel is larger than that of the fifth channel, and the inner diameter of the fifth channel is smaller than that of the third section of the valve stem.

[0028] The valve end cap is located at one end of the sixth channel, forming a movable cavity;

[0029] The fourth section of the valve stem passes through the elastic element of the fifth and sixth channels and is connected to it. The diameter of the third section is larger than the inner diameter of the fifth channel.

[0030] Preferably, the gland is provided with external threads;

[0031] The third sub-channel has an internal thread that mates with the external thread.

[0032] Preferably, it also includes: a lock nut;

[0033] The lock nut is fitted onto the valve cap to restrict the movement of the valve end cover relative to the valve cap.

[0034] Preferably, it further includes: a first snap-fit ​​component and a second snap-fit ​​component;

[0035] The first snap-fit ​​assembly is located at the inlet and is used to connect to the pressure relief pipe;

[0036] The second snap-fit ​​component is located at the overflow port and is used to connect to an external collection pipeline.

[0037] Preferably, the first snap-fit ​​assembly and the second snap-fit ​​assembly are the same, and the first snap-fit ​​assembly includes: a rear ferrule, a front ferrule, and a ferrule nut;

[0038] The front ferrule is located at the inlet;

[0039] The outer wall of the inlet is threaded.

[0040] The ferrule nut is threaded into the external thread of the inlet.

[0041] The rear ferrule is located inside the ferrule nut and between the ferrule nut and the front ferrule.

[0042] Preferably, the valve body includes: a horizontal portion and a vertical portion;

[0043] One end of the longitudinal section is connected to the middle of the transverse section, and the transverse section has a first channel.

[0044] A second passage is provided in the longitudinal section;

[0045] Reinforcing ribs are provided at the connection between the horizontal and vertical parts.

[0046] Preferably, both the horizontal and vertical sections are hexagonal prisms.

[0047] Based on the above, the present invention provides an overflow valve, which comprises a first channel and a second channel in the valve body, with the second channel perpendicularly connected to the middle of the first channel. The end of the second channel away from the first channel is the overflow port, and the end of the first channel is the inlet. Along the direction away from the inlet of the first channel, it is sequentially divided into a first sub-channel, a second sub-channel, a third sub-channel, a fourth sub-channel, and a fifth sub-channel. The diameter of the first sub-channel is smaller than the diameter of the second sub-channel, the diameter of the second sub-channel is smaller than the diameter of the third sub-channel, and the diameter of the third sub-channel is smaller than the diameter of the fourth sub-channel. The fourth sub-channel is connected to the second channel. A valve seat is disposed in the second sub-channel, and the valve seat has an axially formed third channel. The valve seat, near the inlet side, radially... Multiple connecting slots communicating with the third channel are provided. A pressure cap is set in the third sub-channel, and a gasket is set in the third sub-channel, located between the valve seat and the pressure cap. A gap is formed between the gasket and the valve seat. A first sealing ring is set between the gasket and the valve seat. The first sealing ring is used to seal the gap. The side of the gasket near the first sealing ring is also provided with a storage position for accommodating the deformation of the first sealing ring. One end of the valve cap is set in the fifth sub-channel, and the valve end cap is set at the other end of the valve cap, forming a movable cavity. An elastic element is set in the movable cavity. One end of the valve stem passes through the pressure cap and the gasket in sequence to cooperate with the third channel, and the other end extends into the valve cap and connects with the elastic element. The elastic element is used to provide elastic restoring force to the valve stem so that the end of the valve stem seals the third channel. The aforementioned relief valve uses a first and second seal to achieve sealing, enabling the first sealing ring to seal not only in high-temperature environments but also in low-temperature environments. Furthermore, it effectively prevents the first sealing ring from affecting the valve stem resistance in high-temperature environments, ensuring the high-temperature performance of the relief valve and thus guaranteeing the safety and stability of pneumatic or hydraulic system pipelines. Additionally, it prevents the first sealing ring from contacting the valve stem during the valve's transition from open to closed states, ensuring that the valve stem does not impact the first sealing ring during its movement and effectively preventing impacts, thereby extending the service life of the first sealing ring. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0049] Figure 1 This is a schematic diagram of the structure of an overflow valve provided in an embodiment of the present invention;

[0050] Figure 2 This is a schematic diagram of the valve body provided in an embodiment of the present invention;

[0051] Figure 3 A cross-sectional view of the valve body provided in an embodiment of the present invention;

[0052] Figure 4 This is a schematic diagram of the valve seat provided in an embodiment of the present invention;

[0053] Figure 5 A cross-sectional view of the valve seat provided in an embodiment of the present invention;

[0054] Figure 6 This is a schematic diagram of the structure of the gasket provided in an embodiment of the present invention;

[0055] Figure 7 A cross-sectional view of the gasket provided in an embodiment of the present invention;

[0056] Figure 8 This is a schematic diagram of the structure of the pressure cap provided in an embodiment of the present invention;

[0057] Figure 9 A cross-sectional view of the pressure cap provided in an embodiment of the present invention;

[0058] Figure 10 This is a schematic diagram of the valve stem structure provided in an embodiment of the present invention;

[0059] Figure 11 This is a schematic diagram of the valve cap provided in an embodiment of the present invention;

[0060] Figure 12 A cross-sectional view of the valve cap provided in an embodiment of the present invention;

[0061] Figure 13 This is a schematic diagram of the valve end cap provided in an embodiment of the present invention;

[0062] Figure 14 This is a cross-sectional view of the valve end cap provided in an embodiment of the present invention;

[0063] Figure 15 This is a schematic diagram of the internal structure of the overflow valve when it is in the closed state, provided in an embodiment of the present invention.

[0064] Figure 16 This is a schematic diagram of the internal structure of the overflow valve when it is in the open state, provided in an embodiment of the present invention.

[0065] Figure 17 This is a schematic diagram showing the internal valve seat, first sealing ring, gasket, and valve stem assembly of the overflow valve in the open state, as provided in an embodiment of the present invention.

[0066] The valve body comprises: 1. First channel 1-1, first sub-channel 1-11, second sub-channel 1-12, third sub-channel 1-13, fourth sub-channel 1-14, fifth sub-channel 1-15, second channel 1-2, horizontal section 1-3, vertical section 1-4, and reinforcing rib 1-5; 2. Valve seat 2. Third channel 2-1 and connecting groove 2-2; 3. First sealing ring; 4. Gasket 4. Arc groove 4-1 and conical structure 4-2; 5. Pressure cap; 6. Valve stem. Section 1 6-1, Section 2 6-2, Section 3 6-3, Section 4 6-4; Valve cap 7, Fourth channel 7-1, Fifth channel 7-2, Sixth channel 7-3; Elastic element 8; Valve end cap 9, Vent hole 9-1; Locking nut 10; First snap-fit ​​assembly 11, Rear ferrule 11-1, Front ferrule 11-2, Ferrule nut 11-3; Second snap-fit ​​assembly 12; Spring support 13; Second sealing ring 14; Third sealing ring 15. Detailed Implementation

[0067] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0068] In this application, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0069] This invention provides an overflow valve, see [link to relevant documentation]. Figure 1 and combined Figures 2 to 6 , Figure 1 The diagram shows the structure of an overflow valve, which includes: valve body 1, valve seat 2, first sealing ring 3, gasket 4, gland 5, valve stem 6, valve cap 7, elastic element 8, and valve end cover 9.

[0070] The valve body 1 has a first channel 1-1 and a second channel 1-2, wherein the second channel 1-2 is perpendicularly connected to the middle part of the first channel 1-1;

[0071] The end of the second channel 1-2 furthest from the first channel 1-1 is the overflow outlet;

[0072] One end of the first channel 1-1 is the inlet;

[0073] Along the inlet direction away from the first channel 1-1, it is divided into a first sub-channel 1-11, a second sub-channel 1-12, a third sub-channel 1-13, a fourth sub-channel 1-14, and a fifth sub-channel 1-15. The diameter of the first sub-channel 1-11 is smaller than the diameter of the second sub-channel 1-12, the diameter of the second sub-channel 1-12 is smaller than the diameter of the third sub-channel 1-13, the diameter of the third sub-channel 1-13 is smaller than the diameter of the fourth sub-channel 1-14, and the fourth sub-channel 1-14 is connected to the second channel 1-2.

[0074] Valve seat 2 is located in the second sub-channel 1-12. Valve seat 2 has a third channel 2-1 axially. On the side of valve seat 2 near the inlet, multiple connecting grooves 2-2 that communicate with the third channel 2-1 are radially provided.

[0075] Pressure cap 5 is located in the third sub-channel 1-13;

[0076] Gasket 4 is disposed in the third sub-channel 1-13 and is located between valve seat 2 and gland 5, forming a gap between gasket 4 and valve seat 2;

[0077] The first sealing ring 3 is disposed between the gasket 4 and the valve seat 2, wherein the first sealing ring 3 is used to seal the gap;

[0078] The gasket 4 is also provided with a storage position on the side near the first sealing ring 3 for accommodating the deformation of the first sealing ring 3;

[0079] One end of the valve cap 7 is located within the fifth sub-channel 1-15;

[0080] The valve end cap 9 is located at the other end of the valve cap 7 and forms a movable cavity;

[0081] Elastic element 8 is disposed in the movable cavity;

[0082] One end of the valve stem 6 passes through the gland 5 and the gasket 4 in sequence to engage with the third channel 2-1, while the other end extends into the valve cap 7 and connects with the elastic element 8. The elastic element 8 is used to provide elastic restoring force to the valve stem 6 so that the end of the valve stem 6 blocks the third channel 2-1.

[0083] It should be noted that, since the valve seat 2 is located in the second sub-channel 1-12, the valve seat 2 has an axially opened third channel 2-1. On the side of the valve seat 2 near the inlet, there are multiple radially opened connecting grooves 2-2 that communicate with the third channel 2-1. Therefore, the fluid entering from the inlet of the first channel 1-1 can enter the cavity formed by the valve seat 2, the gasket 4 and the first sealing ring 3 along the connecting grooves 2-2. The fluid force generated by this fluid can make the first sealing ring 3 seal the gap formed between the valve seat 2 and the gasket 4.

[0084] When the overflow valve is closed, that is, when the fluid force entering the first channel 1-1 is less than the elastic restoring force provided by the elastic element 8, the end of the valve stem 6 is sealed with the valve seat 2 (first seal) to cut off the fluid entering the first channel 1-1. Part of the fluid enters the cavity formed by the valve seat 2, the gasket 4 and the first sealing ring 3 through the connecting groove 2-2. The fluid force generated by the fluid can make the first sealing ring 3 seal the gap formed between the valve seat 2 and the gasket 4 (second seal).

[0085] When the relief valve is in a low-temperature environment (e.g., an ambient temperature of -50℃), the first sealing ring 3 hardens. At this time, the deformation of the first sealing ring 3 is extremely small, but the first sealing ring 3 can still seal the gap formed between the valve seat 2 and the gasket 4 through fluid force. When the relief valve is in a high-temperature environment (e.g., an ambient temperature of 80℃), the first sealing ring 3 softens and expands. Since the gasket 4 has a receiving position on the side near the first sealing ring 3 to receive the deformation of the first sealing ring 3, the amount of deformation of the first sealing ring 3 can fill the receiving position, effectively preventing the first sealing ring 3 from filling the gap formed between the valve seat 2 and the gasket 4 under the action of fluid force, thereby preventing the first sealing ring 3 from affecting the resistance when the valve stem 6 moves.

[0086] It is worth noting that the elastic restoring force of the elastic element 8 can be adjusted by rotating the valve end cover 9 to ensure that the relief valve meets different pressure requirements.

[0087] When the relief valve is in the open state, the fluid force overcomes the elastic restoring force provided by the elastic element 8 and pushes the valve stem 6 away from the inlet. The valve stem 6 slowly separates from the valve seat 2. The fluid enters the fourth sub-channel 1-14 of the first channel 1-1 through the gasket 4 and the gland 5 in sequence, and then quickly depressurizes through the second channel 1-2. When the fluid force generated by the fluid is insufficient to completely push open the valve stem 6, the valve stem 6 moves towards the valve seat 2 until the valve stem 6 gently fits into the third channel 2-1. During the process of the valve stem 6 fitting into the third channel 2-1, because the fit between the valve stem 6 and the third channel 2-1 is relatively gentle, and because there is a certain gap between the first sealing ring 3 and the valve stem 6, this application can effectively eliminate the impact of the valve stem 6 on the valve seat 2 caused by the sudden change in fluid force, thereby avoiding the first sealing ring 3 being impacted by the valve stem 6 and effectively improving the service life of the first sealing ring 3.

[0088] It should also be noted that some fluid enters the cavity formed by valve seat 2, gasket 4 and first sealing ring 3 through connecting groove 2-2. The fluid force generated by the fluid is small. Therefore, the fluid force here can only seal the gap formed by valve seat 2 and gasket 4 with first sealing ring 3, and will not squeeze first sealing ring 3 too much into the gap formed by valve seat 2 and gasket 4.

[0089] The valve body 1 of this embodiment has a first channel 1-1 and a second channel 1-2, with the second channel 1-2 perpendicularly connected to the middle of the first channel 1-1. The end of the second channel 1-2 away from the first channel 1-1 is an overflow port, and the end of the first channel 1-1 is an inlet. Along the direction away from the inlet of the first channel 1-1, it is sequentially divided into a first sub-channel 1-11, a second sub-channel 1-12, a third sub-channel 1-13, a fourth sub-channel 1-14, and a fifth sub-channel 1-15. The diameter of the first sub-channel 1-11 is smaller than the diameter of the second sub-channel 1-12, the diameter of the second sub-channel 1-12 is smaller than the diameter of the third sub-channel 1-13, the diameter of the third sub-channel 1-13 is smaller than the diameter of the fourth sub-channel 1-14, and the fourth sub-channel 1-14 is connected to the second channel 1-2. A valve seat 2 is disposed in the second sub-channel 1-12, and the valve seat 2 has an axially formed third channel 2-1. On the side of the valve seat 2 near the inlet, there are multiple connecting grooves 2-2 radially opened, which communicate with the third channel 2-1. The pressure cap 5 is set in the third sub-channel 1-13. The gasket 4 is set in the third sub-channel 1-13 and is located between the valve seat 2 and the pressure cap 5. A gap is formed between the gasket 4 and the valve seat 2. The first sealing ring 3 is set between the gasket 4 and the valve seat 2. The first sealing ring 3 is used to seal the gap. The side of the gasket 4 near the first sealing ring 3 is also provided with a storage position for storing the first sealing ring 3 when it is deformed. One end of the valve cap 7 is set in the fifth sub-channel 1-15. The valve end cap 9 is set in the other end of the valve cap 7 and forms a movable cavity. The elastic element 8 is set in the movable cavity. One end of the valve stem 6 passes through the pressure cap 5 and the gasket 4 in sequence and cooperates with the third channel 2-1. The other end extends into the valve cap 7 and is connected to the elastic element 8. The elastic element 8 is used to provide elastic restoring force to the valve stem 6 so that the end of the valve stem 6 seals the third channel 2-1. The relief valve disclosed above uses a first seal and a second seal to achieve sealing, enabling the first sealing ring 3 to seal not only in high-temperature environments but also in low-temperature environments. Furthermore, it effectively prevents the first sealing ring 3 from affecting the resistance of the valve stem 6 in high-temperature environments, ensuring the high-temperature performance of the relief valve and thus guaranteeing the safety and stability of the pneumatic or hydraulic system pipeline. Additionally, it prevents the first sealing ring 3 from contacting the valve stem 6 during the switching process from the open to the closed state, ensuring that the valve stem 6 does not impact the first sealing ring 3 during its movement, effectively avoiding impacts and thus guaranteeing the service life of the first sealing ring 3.

[0090] Specifically, the outer diameter of valve seat 2 decreases in a stepped manner along the inlet direction away from the first channel 1-1;

[0091] The first sealing ring 3 is fitted onto the valve seat 2.

[0092] It should be noted that the outer diameter of the valve seat 2 is set to decrease in a stepped manner along the inlet direction away from the first channel 1-1, and the first sealing ring 3 is fitted on the end of the valve seat 2 near the gasket 4. At this time, the end of the valve seat 2 near the gasket 4 forms a gap with the gasket 4, and the first sealing ring 3 seals the gap between the valve seat 2 and the gasket 4 under the action of fluid force.

[0093] Preferably, the edges of the valve seat 2 that contact the first sealing ring 3 are rounded.

[0094] It should be noted that setting the edge of the valve seat 2 that contacts the first sealing ring 3 to be rounded not only avoids scratching the first sealing ring 3 during installation, but also effectively prevents the valve seat 2 from scratching the deformed first sealing ring 3.

[0095] Specifically, the gasket 4 has an annular arc groove 4-1 at one end near the valve seat 2, and an outwardly protruding conical structure 4-2 to form a storage position;

[0096] A gap is formed between the conical structure 4-2 and the valve seat 2.

[0097] It should be noted that by providing an annular arc groove 4-1 at one end of the gasket 4 near the valve seat 2, and providing an outwardly protruding conical structure 4-2 to form a receiving position, a gap is formed between the conical structure 4-2 and the valve seat 2. Thus, under high temperature conditions, the first sealing ring 3 can effectively ensure that the first sealing ring 3 deforms towards the conical structure 4-2 and the arc groove 4-1, effectively preventing the first sealing ring 3 from filling the gap formed between the valve seat 2 and the gasket 4 under the action of fluid force, thereby preventing the first sealing ring 3 from affecting the resistance when the valve stem 6 moves.

[0098] Specifically, the valve stem 6 is divided into a first section 6-1, a second section 6-2, a third section 6-3, and a fourth section 6-4 along the direction away from the valve seat 2. The diameter of the third section 6-3 is larger than the diameter of the second section 6-2, the diameter of the second section 6-2 is larger than the diameter of the first section 6-1, and the diameter of the fourth section 6-4 is smaller than the diameter of the third section 6-3.

[0099] The diameter of the second segment 6-2 is the same as that of the third channel 2-1;

[0100] The gland 5 is fitted onto the third section 6-3 of the valve stem 6;

[0101] A fourth channel 7-1, a fifth channel 7-2, and a sixth channel 7-3 are sequentially opened along the axial direction of the valve cap 7. The inner diameter of the fourth channel 7-1 is larger than the inner diameter of the fifth channel 7-2, and the inner diameter of the fifth channel 7-2 is smaller than the diameter of the third section 6-3 of the valve stem 6.

[0102] The valve end cap 9 is located at one end of the sixth channel 7-3, forming a movable cavity;

[0103] The fourth segment 6-4 of the valve stem 6 passes through the fifth channel 7-2 and is connected to the elastic element 8 of the sixth channel 7-3. The diameter of the third segment 6-3 is larger than the inner diameter of the fifth channel 7-2.

[0104] It should be noted that the valve stem 6 is divided into a first segment 6-1, a second segment 6-2, a third segment 6-3, and a fourth segment 6-4 along the direction away from the valve seat 2. The diameter of the third segment 6-3 is larger than that of the second segment 6-2, the diameter of the second segment 6-2 is larger than that of the first segment 6-1, and the diameter of the fourth segment 6-4 is smaller than that of the third segment 6-3. The diameter of the second segment 6-2 is the same as that of the third channel 2-1. The gland 5 is fitted onto the third segment 6-3 of the valve stem 6. A fourth channel 7-1, a fifth channel 7-2, and a sixth channel 7-3 are sequentially opened along the axial direction of the valve cap 7. The fourth channel 7-1 is larger than that of the fifth channel 7-2, and the inner diameter of the fifth channel 7-2 is smaller than that of the third segment 6-3 of the valve stem 6. The valve end cap 9 is located at one end of the sixth channel 7-3, forming a movable cavity. The fourth segment of the valve stem 6... Section 6-4 passes through the fifth channel 7-2 and connects to the elastic element 8 of the sixth channel 7-3. The diameter of the third section 6-3 is larger than the inner diameter of the fifth channel 7-2. Thus, when the relief valve is closed, the first section 6-1 can effectively limit the flow of the third channel 2-1, while the second section 6-2 cooperates with the third channel 2-1 to seal the third channel 2-1. When the relief valve is open, the first section 6-1 of the valve stem 6 does not limit the flow of the third channel 2-1. When the fluid force is less than the elastic restoring force of the elastic element 8, as the valve stem 6 moves toward the valve seat 2, the first section 6-1 limits the flow of the third channel 2-1. The greater the movement distance, the more obvious the flow restriction, until the second end of the valve stem 6 cooperates with the third channel 2-1 to cut off the fluid flow.

[0105] By setting the inner diameter of the fourth channel 7-1 to be larger than that of the fifth channel 7-2, and the inner diameter of the fifth channel 7-2 to be smaller than that of the third segment 6-3 of the valve stem 6, the step formed between the fourth channel 7-1 and the fifth channel 7-2 restricts the third segment 6-3 of the valve stem 6 from entering the fifth channel 7-2, which can effectively limit the opening of the valve stem 6.

[0106] Preferably, the valve cap 7 is threadedly connected to the valve body 1;

[0107] A second sealing ring 14 is also provided between the valve cap 7 and the valve body 1, wherein the second sealing ring 14 is sleeved on the valve cap 7.

[0108] It should be noted that the valve cap 7 is threaded to the valve body 1, and a second sealing ring 14 is provided between the valve cap 7 and the valve body 1. This not only ensures the connection strength between the valve cap 7 and the valve body 1, but also ensures the sealing performance between the valve cap 7 and the valve body 1.

[0109] Specifically, the pressure cap 5 is provided with external threads;

[0110] The third sub-channel 1-13 is provided with an internal thread that mates with the external thread.

[0111] It should be noted that by setting external threads on the outside of the gland 5 and internal threads that mate with the external threads in the third sub-channels 1-13, the size of the gap between the gasket 4 and the base can be effectively guaranteed. This avoids the gap from being too large, which would cause the first sealing ring 3 to fill the gap too much under the action of fluid force. Furthermore, it avoids the problem of increased movement resistance of the valve stem 6 due to contact between the first sealing ring 3 and the valve stem 6.

[0112] Preferably, there is a tapered transition section between the fourth segment 6-4 and the third segment 6-3.

[0113] It should be noted that a tapered transition section is provided between the fourth segment 6-4 and the third segment 6-3 of the valve stem 6. The tapered transition section, through the step formed between the fourth channel 7-1 and the fifth channel 7-2, can reduce the impact between the valve stem 6 and the step formed between the fourth channel 7-1 and the fifth channel 7-2, thereby improving the overall rigidity of the valve stem 6.

[0114] Preferably, the overflow valve further includes: a third sealing ring 15;

[0115] The third sealing ring 15 is located inside the valve cap 7 and is fitted onto the valve stem 6.

[0116] It should be noted that by setting a third sealing ring 15 and fitting it onto the valve stem 6, the sealing performance between the valve stem 6 and the valve cap 7 can be improved, preventing fluid leakage through the gap between the valve cap 7 and the valve stem 6.

[0117] Furthermore, the overflow valve also includes: a lock nut 10;

[0118] The locking nut 10 is fitted onto the valve cap 7 to restrict the movement of the valve end cover 9 relative to the valve cap 7.

[0119] It should be noted that by setting a locking nut 10 on the valve cap 7, the locking nut 10 can effectively prevent the valve end cover 9 from separating from the valve cap 7 through its cooperation with the valve cap 7 end cover, that is, effectively prevent the valve cap 7 end cover from loosening, and further ensure the stability and safety of the relief valve.

[0120] Furthermore, the overflow valve also includes: a first snap-fit ​​assembly 11 and / or a second snap-fit ​​assembly 12;

[0121] The first snap-fit ​​assembly 11 is located at the inlet and is used to connect to the pressure relief pipe;

[0122] The second snap-fit ​​component 12 is located at the overflow port and is used to connect to an external collection pipeline.

[0123] It should be noted that placing the first snap-fit ​​component 11 at the inlet facilitates the installation of the overflow valve on the pressure relief pipe, while placing the second snap-fit ​​component 12 at the overflow port facilitates the connection of the overflow valve to the external collection pipeline, effectively improving the connection convenience of the pneumatic or hydraulic system pipeline.

[0124] Specifically, the first snap-fit ​​assembly 11 and the second snap-fit ​​assembly 12 are the same. The first snap-fit ​​assembly 11 includes: a rear snap-fit ​​sleeve 11-1, a front snap-fit ​​sleeve 11-2 and a snap-fit ​​nut 11-3.

[0125] The front ferrule 11-2 is located at the inlet;

[0126] The outer wall of the inlet is threaded.

[0127] The ferrule nut 11-3 is threaded into the inlet external thread;

[0128] The rear ferrule 11-1 is located inside the ferrule nut 11-3 and between the ferrule nut 11-3 and the front ferrule 11-2.

[0129] It should be noted that the front ferrule 11-2 is located at the inlet, and the outer wall of the inlet is provided with external threads. The ferrule nut 11-3 is threadedly connected to the external threads of the inlet. The rear ferrule 11-1 is located inside the ferrule nut 11-3 and between the ferrule nut 11-3 and the front ferrule 11-2, which can effectively ensure the connection strength and sealing of the overflow valve and the pressure relief pipe.

[0130] Specifically, valve body 1 includes: horizontal part 1-3 and vertical part 1-4;

[0131] One end of the vertical part 1-4 is connected to the middle of the horizontal part 1-3, and the horizontal part 1-3 has a first channel 1-1.

[0132] The longitudinal section 1-4 has a second channel 1-2;

[0133] A reinforcing rib 1-5 is provided at the connection between the horizontal part 1-3 and the vertical part 1-4.

[0134] It should be noted that the valve body 1 is configured as a horizontal part 1-3 and a vertical part 1-4, and one end of the vertical part 1-4 is connected to the middle of the horizontal part 1-3. The horizontal part 1-3 has a first channel 1-1, the vertical part 1-4 has a second channel 1-2, and a reinforcing rib 1-5 is provided at the connection between the horizontal part 1-3 and the vertical part 1-4, which can effectively ensure the rigidity of the valve body 1.

[0135] Specifically, both the horizontal section 1-3 and the vertical section 1-4 are hexagonal prisms.

[0136] It should be noted that by setting the horizontal part 1-3 and the vertical part 1-4 as hexagonal prisms, the valve body 1 can be fixed with a wrench.

[0137] Preferably, the reinforcing ribs 1-5 have through holes for the steel rope to pass through.

[0138] It should be noted that by opening through holes in the reinforcing ribs 1-5 for the steel rope to pass through, and then setting the force of the elastic element 8 of the overflow valve, the nameplate of the overflow valve can be fixed or the overflow valve can be sealed with lead by the steel rope.

[0139] Preferably, the overflow valve further includes: a spring support 13;

[0140] Elastic element 8 is a spring;

[0141] The spring support 13 is disposed in the movable cavity and is located between the valve stem 6 and the spring;

[0142] The valve end cover 9 has a vent hole 9-1.

[0143] It should be noted that by opening a vent hole 9-1 in the valve end cover 9, it is possible to prevent the valve end cover 9 from having difficulty adjusting the spring pressure after the sealed movable cavity formed by the valve end cover 9 and the valve cap 7 has been blocked by air and pressure.

[0144] To facilitate understanding of the above scheme, the following will be combined with... Figures 1 to 6 Further explanation is needed.

[0145] The valve body 1 is a forged structure consisting of two solid hexagonal bars (i.e., the horizontal part 1-3 and the vertical part 1-4 of the aforementioned hexagonal prism) perpendicular to each other. This design facilitates installation and adjustment in all directions using a wrench, while also saving on weight and cost. Furthermore, the valve body 1 has isosceles triangular reinforcing ribs 1-5 on the intersecting edges of the two hexagonal bars. A small through hole is located at the center of each reinforcing rib 1-5 for suspending the overflow valve label or fixing one end of a steel rope to seal the overflow valve with a calibrated spring-set pressure. The inlet and outlet of the valve body 1 are connected by a compression fitting seal (i.e., the first compression fitting assembly 11 and the second compression fitting assembly 12). Externally, it has external threads that engage with the compression fitting nut 11-3 to fix the steel pipe. Internally, it has a sealing conical surface, a straight hole, and a limiting conical hole. The sealing cone surface and the front ferrule 11-2 are mutually fitted, the straight hole and the outer diameter of the steel pipe are clearance fitted, and the bottom hole diameter of the limiting cone hole is smaller than the outer diameter of the steel pipe. This not only limits the distance the steel pipe can extend into the valve body 1, but also enhances the wall thickness from the limiting cone hole to the external thread relief groove, ensuring the safety of the pressure-bearing wall thickness at the inlet and outlet of the overflow valve. When the ferrule nut 11-3 is tightened, the ferrule nut 11-3 applies an axial force to the rear ferrule 11-1 and the front ferrule 11-2, causing the rear ferrule 11-1 and the front ferrule 11-2 to push the steel pipe forward and finally fit tightly against the limiting cone hole. When the ferrule nut 11-3 is further tightened, since the steel pipe is now limited and cannot move, the front ferrule 11-2 is filled with the gap between the sealing cone surface and the steel pipe by the axial force of the rear ferrule 11-1, thus firmly holding and fixing the steel pipe, and finally fitting with the sealing cone surface to form an excellent seal. In addition, a flask-shaped relief groove with a cylindrical top and a frustum-shaped bottom is formed at the bottom of the external threads of the valve body 1 at the inlet and outlet. The outer diameter of the cylindrical part of the relief groove is smaller than the size of the external threads of the inlet and outlet, so that the ferrule nut 11-3 can be tightened to the bottom; the bottom surface of the frustum-shaped part is much larger than the outer diameter of the thread, so as to strengthen the wall thickness of the relief groove and prevent the inlet and outlet of the valve body 1 from being broken during the tightening of the ferrule nut 11-3.

[0146] A stepped "axis"-shaped hole is formed inside the valve body 1 in the horizontal direction. From left to right, the holes are: the smallest flow channel hole at the top of the axis (i.e., the first sub-channel 1-11 mentioned above), the larger valve seat mounting hole (i.e., the second sub-channel 1-12 mentioned above), the larger gland mounting hole (i.e., the third sub-channel 1-13 mentioned above), the largest flow channel hole (i.e., the fourth sub-channel 1-14 mentioned above), the valve seat mounting hole and the valve cap mounting hole (i.e., the fifth sub-channel 1-15 mentioned above) are coaxial, and there is an O-ring groove of the same size as the flow channel hole (located at the end of the fifth sub-channel 1-15 away from the fourth sub-channel 1-14). Among them, a 45° chamfer is formed at the intersection of the valve seat mounting hole and the flow channel hole. The purpose is to remove the right-angle intersection edge of the bottom surface of the straight hole that cannot be machined by the drill bit or milling cutter when machining the inner hole of the valve body 1, so that the valve seat 2 can fit well with the bottom surface of the valve seat mounting hole and be installed to the bottom. Two rounded corners are provided at the intersection of the valve seat mounting hole and the gland mounting hole. These serve two purposes: first, to remove parts that cannot be machined by the drill or milling cutter; and second, to act as leads for installing O-rings, and the rounded corners prevent scratching the O-rings. Internal threads of the same specification and size are provided on both the gland mounting hole and the valve cap mounting hole, with the threads chamfered at a 45° angle to the root diameter of the first thread to ensure a smooth fit between the internal and external threads. Because the force on the valve cap 7 is much greater than that on the gland 5, the thread depth on the valve cap 7 mounting hole is much greater than that on the gland mounting hole. The flow channel hole has the largest diameter, serving two purposes: first, to quickly discharge any remaining fluid from the overflow valve; and second, to act as a relief groove for machining the threads in the gland mounting hole and valve cap mounting hole, facilitating the chamfering of the end face threads and ensuring a smooth fit between the internal and external threads. The diameter of the O-ring groove is the same as that of the flow channel hole. It serves two purposes: first, as a relief groove to facilitate the machining of the chamfer on the threaded end face of the valve cap 7 mounting hole; and second, as an O-ring groove for mounting the O-ring. In addition, a tapered angle is provided on the right end face of the O-ring groove as a pin for mounting the O-ring.

[0147] A flow channel hole (i.e., the second channel 1-2) larger than the first sub-channel 1-11 is opened in the vertical direction of the valve body 1. The center of the flow channel hole is aligned with the first sub-channel 1-11 and the outlet of the overflow valve. The purpose is to quickly unload the overflow fluid in the air pressure and hydraulic system pipelines and ensure the pipeline pressure is stable and safe.

[0148] The valve seat 2 is a stepped cylinder, with the smallest cylinder being the longest, followed by the largest, and the smallest being the middle cylinder. The outer diameter of the smallest cylinder is slightly larger than the inner diameter of the O-ring (the first sealing ring 3 here), which is 0-0.4 mm larger. The inner diameter of the O-ring is smaller than the outer diameter of the middle cylinder, which is smaller than the outer diameter of the O-ring, while the outer diameter of the largest cylinder is larger than the outer diameter of the O-ring. This design allows the O-ring to fit onto the smallest cylinder of the valve seat 2, creating a groove on the side of the O-ring near the largest cylinder to store fluid. This fluid force is then applied to the O-ring, causing it to expand and press into the gap between the valve seat 2 and the valve stem 6, thus forming a seal. A cross-shaped groove (i.e., the connecting groove 2-2 mentioned above) is provided on the end face of the largest cylinder of the valve seat 2. This groove extends through the entire end face, serving as a flow channel for fluid to enter the groove formed by the largest cylinder of the valve seat 2 and the O-ring. Similarly, to ensure a good fit between the valve seat 2 and its mounting hole, a 45° chamfer is made on the edge of the large cylindrical end face of the valve seat 2; and rounded corners are also made on the edge of the end face of the valve seat 2 where it contacts the O-ring. The flow channel hole size of the valve seat 2 is the same as that of the flow channel hole of the valve body 1. At the left end face of the small cylinder of the valve seat 2, the flow channel hole of the valve seat 2 is provided with a flared structure formed by a combination of rounded corners and chamfers, which not only enables the valve stem 6 to extend into the valve seat 2, but also enables the rapid release of fluid when overflow occurs; a 45° chamfer is made on the right end face of the large cylindrical end face of the valve seat 2 to reduce fluid resistance and allow fluid to flow into the valve seat 2 quickly.

[0149] The gasket 4 has rounded edges on both ends, and a conical arc groove 4-1 on one end face. This not only reduces the exposed groove size of the O-ring (i.e., reduces the gap between the gasket 4 and the valve seat 2), but also allows most of the O-ring to be enclosed when it expands under fluid pressure, with only a small portion being squeezed out of the O-ring groove. This results in a larger gap between the O-ring and the valve stem 6, preventing repeated impact damage to the valve stem 6 during reset. The gasket 4's flow channel hole features a conical horn hole on the left end face, a straight hole in the middle with the same inner diameter as the valve stem 6, and an arc-shaped conical hole on the right end face. Its functions are: firstly, the arc-shaped conical hole reduces the exposed groove size of the O-ring; secondly, the straight hole provides guidance for the valve stem 6; and thirdly, the conical horn hole allows for rapid pressure relief when the valve stem 6 moves axially from the valve seat 2 by 1.5-2.3mm, avoiding the negative impact of requiring significant fluid force to push the valve stem 6 a long distance for pressure relief.

[0150] The left half of the gland 5 has an external thread that mates with the mounting hole of the gland 5 on the valve body 1, while the right half is a threadless cylindrical structure with an outer diameter smaller than the thread size of the left half. A straight hole is provided on the right end face of the gland 5, with the inner diameter and depth matching the outer diameter and thickness of the gasket 4. A stepped cylindrical hole is provided in the middle of the gland 5. The right end face of the stepped cylindrical hole is a small cylindrical hole with an inner diameter the same as the outer diameter of the valve stem 6, serving the same guiding function for the valve stem 6. The left side of the stepped cylindrical hole is a large cylindrical inner hole with a conical flared structure connecting to the small cylinder on the right, also for the purpose of accelerating fluid overflow. A hexagonal hole is provided on the left end face of the gland 5, serving as a wrench position and flow channel for tightening the gland 5.

[0151] The valve stem 6 is a stepped cylindrical structure. From left to right, the outer diameter of the small cylinder (i.e., the first section 6-1 above) is smaller than the inner diameter of the flow channel hole in the valve seat 2, and its length is 0.5-1.5mm. The outer diameter of the medium cylinder (i.e., the second section 6-2 above) is the same as the inner diameter of the flow channel hole in the valve seat 2, and its length is 0.5-1mm. Since the relief valve needs to promptly release excess fluid from the system pipeline to maintain stable system pipeline pressure, the lengths of the small and medium cylinders of the valve stem 6 should not be too long. Excessive length will restrict the flow during overflow, leading to increased fluid force on the valve core when the relief valve is fully open. When the fluid flow rate is large, this will cause a momentary overpressure in the system pipeline, potentially causing system pipeline components to rupture and be damaged. The outer diameter of the large cylinder (i.e., the third section 6-3 above) is the same as the outer diameter of the small cylinder on the valve seat 2, the inner diameter of the straight hole on the gasket 4, the inner diameter of the small cylinder in the stepped hole of the gland 5, and the inner diameter of the valve core hole on the valve cap 7. A tapered section is provided at the connection between the medium and large cylinders to limit the opening distance of the relief valve core, while a spherical surface is provided on the right end face to facilitate the centering connection of the spring support 13. In addition, to prevent the edge of the valve stem 6 from scratching the O-ring, a rounded corner is provided on the left edge line of the valve stem 6.

[0152] The valve cap 7 has external threads of the same specifications and dimensions at both ends, with the right end thread being significantly longer than the left. The hexagonal structure in the middle serves as a wrench for tightening the valve cap 7. The cylindrical outer diameter is the same as the O-ring groove diameter on the valve body 1, preventing the O-ring from being squeezed out of the O-ring groove by fluid force. Similarly, the O-ring groove also functions as a relief groove for machining the thread on the left end of the valve cap 7. The valve cap 7 has a first valve core hole and a second valve core hole. The second valve core hole is smaller than the first valve core hole, its purpose being to create a tapered hole at the junction of the first and second valve core holes to axially limit the valve stem 6, thus restricting the opening of the relief valve. The first valve core hole has an O-ring groove for installing the O-ring to prevent fluid from flowing out of the relief valve from the valve cap 7 and valve stem 6. The end face of the first valve core hole has a tapered hole as a lead angle for installing the O-ring. The edge where the second valve core hole meets the spring cavity (i.e. the above-mentioned movable cavity) is chamfered at 45°, while the bottom edge of the spring cavity is rounded and the end face of the spring cavity is chamfered at 45°, so as to facilitate the smooth installation of the spring support 13 and allow the spring support 13 to be installed on the bottom surface of the spring cavity.

[0153] The valve end cover 9 has two hexagonal wrench positions on its exterior, and a small through hole is provided on the hexagonal part of the right end face. When the overflow valve spring force needs to be sealed, one end of the steel rope can be fixed to the small through hole. In addition, a vent hole 9-1 is opened on the cylinder near the hexagonal structure on the left side to prevent the valve end cover 9 from becoming difficult to adjust the spring pressure after the sealed spring cavity formed by the valve end cover 9 and the valve cap 7 has become airtight or pressurized. The spring cavity on the valve end cover 9 has internal threads, which mate with the external threads on the spring cavity of the valve cap 7.

[0154] Working principle:

[0155] The relief valve is in the closed position:

[0156] Tighten the valve end cap 9 to the corresponding number of thread turns and tighten the lock nut 10 to the valve end cap 9. The spring will be compressed, providing a spring force to the valve stem 6. The small and medium cylinders on the valve stem 6 will be guided by the stepped hole on the gland 5 and the straight hole on the gasket 4 to extend into the flow channel hole of the valve seat 2. At this time, the small cylinder of the valve stem 6 will limit the flow of fluid and buffer the fluid force, while the medium cylinder of the valve stem 6 will form a first seal with the clearance fit with the flow channel hole of the valve seat 2. The left end face of the large cylinder of the valve stem 6 is in contact with the end face of the small cylinder of the valve seat 2. The combination of the valve seat 2, valve stem 6, gasket 4 and O-ring forms the second seal. When fluid is introduced into the overflow valve inlet, the fluid enters the flow channel hole of the valve seat 2 and enters the groove formed between the valve seat 2 and the O-ring from the cross groove of the valve seat 2, squeezing the O-ring into the gap between the gasket 4, valve stem 6 and valve seat 2 to form a seal. The fluid in the flow channel of valve seat 2 is first limited and buffered by the small cylinder of valve stem 6, then mostly sealed by the middle cylinder, and then only a very small portion of the fluid acts on the second seal. Only a very small amount of O-ring deformation is needed to seal this portion of the fluid. When at a low temperature of -50°C, the conventional O-ring will harden, and the amount of compression deformation is extremely small, but it can still seal a very small portion of the fluid. When under high temperature, the O-ring is prone to softening and expansion. However, due to the conical arc groove 4-1 on the side of the gasket 4 and the reduction of the O-ring groove size, most of the O-ring fills the conical arc groove 4-1 when it expands, and only a small portion is stuffed into the gap between the valve stem 6 and the valve seat 2. Furthermore, the stepped segmented sealing valve core structure of this invention makes the fluid force acting on the second seal extremely small. The O-ring is not firmly stuffed into the gap of the valve stem 6 by the fluid force, and thus the frictional resistance between the O-ring and the valve stem 6 does not increase. As a result, the overflow pressure of the relief valve at high temperature remains consistent with that at normal temperature and low temperature under the same spring force, thereby improving the high temperature performance of the relief valve and ensuring the safe, stable, and efficient operation of the system pipeline under high temperature conditions.

[0157] When the relief valve is open:

[0158] The stepped segmented valve core sealing structure of this application allows the fluid force to increase or decrease slowly. When the fluid force overcomes the spring force and opens the valve core, the valve stem 6 disengages from the valve seat 2 and moves axially to the right to release pressure. The length of the small cylinder of the valve stem 6 is 0.5-1.5mm, the length of the medium cylinder is 0.5-1mm, and the axial movement of the large cylinder of the valve stem 6 is 1.5-2.3mm. When it reaches the stepped cylindrical hole of the gland 5, the valve stem 6 does not restrict the flow of fluid, and the fluid will be released quickly. When the fluid force is insufficient to fully open the valve stem 6, the valve stem 6 will move to the left. At this time, the small and medium cylinders will partially restrict the flow of fluid. The greater the leftward movement of the valve stem 6, the more obvious the flow restriction, which in turn allows the fluid to slowly overflow until it is insufficient to overcome the spring force. Then, the valve stem 6 gently fits onto the valve seat 2, eliminating the impact of the valve stem 6 on the valve seat 2 caused by the sudden change in fluid force. Furthermore, the stepped segmented valve core sealing structure of the present invention minimizes the amount of O-ring squeezed out of the O-ring groove under normal and high temperature conditions, resulting in a large gap between the O-ring and the valve stem 6. This makes the O-ring less susceptible to impact damage, thereby improving the service life of the relief valve.

[0159] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and relevant parts can be referred to the descriptions in the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0160] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0161] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An overflow valve, characterized in that, include: Valve body, valve seat, first sealing ring, gasket, gland, valve stem, valve cap, elastic element, and valve end cover; The valve body has a first channel and a second channel, wherein the second channel is perpendicularly connected to the middle of the first channel; The end of the second channel furthest from the first channel is the overflow outlet; One end of the first channel is the inlet; Along the direction away from the first channel, it is divided into a first sub-channel, a second sub-channel, a third sub-channel, a fourth sub-channel, and a fifth sub-channel in sequence. The diameter of the first sub-channel is smaller than the diameter of the second sub-channel, the diameter of the second sub-channel is smaller than the diameter of the third sub-channel, the diameter of the third sub-channel is smaller than the diameter of the fourth sub-channel, and the fourth sub-channel is connected to the second channel. The valve seat is disposed in the second sub-channel, and the valve seat has a third channel opened axially. On the side of the valve seat near the inlet, a plurality of connecting grooves communicating with the third channel are opened radially. The pressure cap is disposed in the third sub-channel; The gasket is disposed in the third sub-channel and located between the valve seat and the pressure cap, and a gap is formed between the gasket and the valve seat; The first sealing ring is disposed between the gasket and the valve seat, wherein the first sealing ring is used to seal the gap; The gasket is also provided with a storage position on the side near the first sealing ring for accommodating the deformation of the first sealing ring. One end of the valve cap is disposed within the fifth sub-channel; The valve end cap is disposed at the other end of the valve cap and forms a movable cavity; The elastic element is disposed in the movable cavity; One end of the valve stem passes through the gland, the gasket and the third channel in sequence, and the other end extends into the valve cap and is connected to the elastic element. The elastic element is used to provide elastic restoring force to the valve stem so that the end of the valve stem blocks the third channel.

2. The overflow valve according to claim 1, characterized in that, The outer diameter of the valve seat decreases in a stepped manner along the direction away from the inlet of the first channel; The first sealing ring is fitted onto the valve seat.

3. The overflow valve according to claim 2, characterized in that, The gasket has an annular arc groove at one end near the valve seat and an outwardly protruding conical structure to form the storage position; The gap is formed between the tapered structure and the valve seat.

4. The overflow valve according to claim 1, characterized in that, The valve stem is divided into a first segment, a second segment, a third segment, and a fourth segment along the direction away from the valve seat, wherein the diameter of the third segment is larger than the diameter of the second segment, the diameter of the second segment is larger than the diameter of the first segment, and the diameter of the fourth segment is smaller than the diameter of the third segment; The diameter of the second segment is the same as that of the third channel; The gland is fitted onto the third section of the valve stem; A fourth channel, a fifth channel, and a sixth channel are sequentially provided along the axial direction of the valve cap, wherein the inner diameter of the fourth channel is larger than the inner diameter of the fifth channel, and the inner diameter of the fifth channel is smaller than the diameter of the third section of the valve stem; The valve end cap is disposed at one end of the sixth channel, forming the movable cavity; The fourth segment of the valve stem passes through the fifth channel and is connected to the elastic element of the sixth channel, and the diameter of the third segment is larger than the inner diameter of the fifth channel.

5. The overflow valve according to claim 1, characterized in that, The gland is provided with external threads; The third sub-channel is provided with an internal thread that mates with the external thread.

6. The overflow valve according to claim 1, characterized in that, Also includes: Tighten the nut; The locking nut is fitted onto the valve cap to restrict the movement of the valve end cap relative to the valve cap.

7. The overflow valve according to claim 1, characterized in that, Also includes: First card connector and second card connector; The first snap-fit ​​assembly is disposed at the inlet and is used to connect to the pressure relief pipe; The second snap-fit ​​component is located at the overflow port and is used to connect to an external collection pipeline.

8. The overflow valve according to claim 7, characterized in that, The first snap-fit ​​assembly is the same as the second snap-fit ​​assembly. The first snap-fit ​​assembly includes: a rear retaining sleeve, a front retaining sleeve, and a retaining sleeve nut. The front ferrule is disposed at the inlet; The outer wall of the inlet is provided with external threads; The ferrule nut is threadedly connected to the external thread of the inlet. The rear ferrule is disposed inside the ferrule nut and is located between the ferrule nut and the front ferrule.

9. The overflow valve according to claim 1, characterized in that, The valve body includes: a horizontal portion and a vertical portion; One end of the vertical section is connected to the middle of the horizontal section, and the horizontal section has the first channel. The longitudinal section is provided with the second channel; The connection between the horizontal and vertical parts is provided with reinforcing ribs.

10. The overflow valve according to claim 9, characterized in that, Both the horizontal and vertical sections are hexagonal prisms.

Images