Safety valve with valve spring convenient to adjust

Abstract

The utility model discloses a safety valve with a valve spring convenient to adjust, and relates to the technical field of safety valves. The top of the valve seat is fixedly provided with a valve body, the inside of the valve seat is movably connected with an I-shaped valve core, the inside of the valve body is provided with an elastic component, the top of the elastic component is provided with an adjusting component, the outer surface of the adjusting component is provided with a fixing component, and the top of the valve body is rotatably connected with a limiting component. The adjusting assembly can be limited through the fixing assembly, so that the adjusting assembly cannot rotate at will when the adjusting assembly is not separated from the fixed end of the fixing assembly, meanwhile, the limiting assembly can limit the top end of the adjusting assembly, and therefore the adjusting assembly cannot move upwards at will; when the safety valve is used under dual limiting of the fixing assembly and the limiting assembly, the phenomenon that the adjusting assembly rotates due to mistaken touch is avoided, and therefore the overall stability of the safety valve is improved when the safety valve is used.

Description

Technical Field

[0001] The utility model belongs to the technical field of safety valves. Specifically, it particularly relates to a safety valve with a valve spring that is convenient to adjust. Background Art

[0002] A safety valve is a special valve in which the closing member is in a normally closed state under the action of an external force. When the medium pressure in a device or pipeline rises above a specified value, it prevents the medium pressure in the pipeline or device from exceeding the specified value by discharging the medium to the outside of the system. The safety valve belongs to the category of automatic valves and is mainly used on boilers, pressure vessels, and pipelines to control the pressure not to exceed the specified value, playing an important protective role in personal safety and equipment operation.

[0003] In the Chinese Patent Network CN215950499U, a safety valve that is convenient to adjust is disclosed, including a valve seat and a valve body. A connecting seat is fixedly provided at the top of the valve seat. A valve core is slidably connected to the central position of the connecting seat. The top of the inner bottom of the valve seat is fixedly connected with a pressure relief port. The valve core is located directly above the pressure relief port. The top of the pressure relief port is fixedly connected with a connecting rod. The top of the connecting rod is fixedly connected with a movable block. A compression spring is movably sleeved on the top of the movable block. A sliding rod is fixedly connected to the top of the movable block. An upper sleeve is movably sleeved on the top of the sliding rod. A pressure detection device is fixedly installed on the top of the upper sleeve. A rotating cylinder is provided at the top of the pressure detection device.

[0004] By rotating the rotating cylinder, the upper sleeve can be made to squeeze the compression spring. In order to facilitate the rotation of the rotating cylinder, the handle for rotating the rotating cylinder is set at a position on the top of the valve body that is easy to rotate. And since there is no fixing device on the rotating cylinder, after the elastic force of the compression spring is adjusted by rotating the rotating cylinder, during the subsequent use of the installed valve, it is easy to occur that the rotating cylinder rotates due to accidentally touching the handle, resulting in the elastic force of the compression spring being prone to change and the threshold value of the safety valve changing. The above phenomena make the overall stability not high when using the safety valve.

[0005] Regarding the problems in the related art, no effective solutions have been proposed yet. Summary of the Utility Model

[0006] Regarding the problems in the related art, the present utility model proposes a safety valve with a valve spring that is convenient to adjust to overcome the above-mentioned technical problems existing in the prior related art.

[0007] To solve the above technical problems, the present utility model is achieved through the following technical solutions:

[0008] The utility model relates to a safety valve with a valve spring that is easy to adjust, which includes a valve seat. A valve body is fixedly installed at the top of the valve seat. An I-shaped valve core is movably connected inside the valve seat. An elastic component is arranged inside the valve body. The guiding end of the elastic component is movably connected with the I-shaped valve core. An adjusting component is arranged at the top of the elastic component. A fixing component is arranged on the outer surface of the adjusting component. A limiting component is rotatably connected to the top of the valve body.

[0009] Further, the elastic component includes a T-shaped guiding column. The top end of the T-shaped guiding column is fixedly connected to the inner wall of the valve body. A guiding groove is opened at the top of the I-shaped valve core. The T-shaped guiding column is movably connected with the guiding groove. A connecting ring is movably connected to the outer surface of the T-shaped guiding column. A valve spring is fixedly connected between the connecting ring and the valve seat.

[0010] Further, the adjusting component includes an adjusting disc. An adjusting cavity is opened at the top of the T-shaped guiding column. The adjusting disc is movably connected with the adjusting cavity. A connecting groove is opened on the inner wall of the adjusting cavity. A connecting block is fixedly connected between the adjusting disc and the connecting ring. The connecting block is movably connected with the connecting groove. An adjusting screw is threadedly connected to the top of the T-shaped guiding column. The bottom end of the adjusting screw is rotatably connected to the adjusting disc.

[0011] Further, the adjusting component further includes an adjusting cylinder. An adjusting groove is opened on the inner wall of the adjusting cylinder. An adjusting block is movably connected inside the adjusting groove. The adjusting block is fixedly connected to the outer surface of the adjusting screw. A handle is rotatably connected to the top of the adjusting cylinder.

[0012] Further, the fixing component includes an internal gear. The internal gear is fixedly connected to the inner wall of the valve body. An external gear is meshed with the inner wall of the internal gear. The external gear is fixedly connected to the adjusting cylinder. A T-shaped groove is opened at the top of the T-shaped guiding column. A T-shaped rotating ring is rotatably connected inside the T-shaped groove. A fixing ring is fixedly connected to the outer surface of the adjusting cylinder. A return spring is fixedly connected between the T-shaped rotating ring and the fixing ring.

[0013] Further, the limiting component includes a T-shaped rotating shaft. The T-shaped rotating shaft is fixedly connected to the top of the internal gear. A limiting plate is rotatably connected to the outer surface of the T-shaped rotating shaft. The inner wall of the limiting plate is in contact with the outer surface of the adjusting cylinder. A limiting block is fixedly connected to the top of the internal gear. A clamping block is fixedly connected to one side of the limiting block. A clamping groove is opened on the limiting plate corresponding to the clamping block.

[0014] Further, a pressure relief groove is opened on the inner wall of the valve seat. The I-shaped valve core is movably connected with the pressure relief groove. A water pressure gauge is fixedly installed on the outer surface of the valve seat corresponding to the pressure relief groove.

[0015] The utility model has the following beneficial effects:

[0016] 1. By pulling the adjusting component upward, the present utility model can make the adjusting component rotate and adjust the elastic force of the elastic component. When the adjusting component is in its original position, the fixing component can limit the adjusting component, so that the adjusting component will not rotate randomly when it is not separated from the fixed end of the fixing component. At the same time, the limiting component can limit the top of the adjusting component, so that the adjusting component will not move upward randomly. Under the double limit of the fixing component and the limiting component, the adjusting component will not rotate when the safety valve is in use, so that the threshold value on the safety valve will not change due to accidental touch after being adjusted to an appropriate size, thus improving the overall stability of the installation valve during use.

[0017] 2. By rotating the limiting plate and making the limiting plate no longer at the top of the external gear, the adjusting cylinder can drive the external gear to move upward and no longer mesh with the internal gear. Then, rotate the limiting plate again and make the clamping groove on one side of the limiting plate clamp onto the outer surface of the clamping block on the limiting block. At this time, the limiting plate can be at the bottom of the external gear. At this time, under the restriction of the limiting plate, the return spring will not pull the adjusting cylinder downward, so that it is not necessary to keep pulling the adjusting cylinder when rotating the adjusting cylinder. In summary, the limiting plate can produce different effects when it is at the top and bottom of the external gear, so that the overall practicality of the limiting component is relatively high.

[0018] Of course, it is not necessary for any product implementing the present utility model to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a schematic diagram of the external contour structure of the present utility model;

[0021] Figure 2 It is a schematic diagram of the sectional structure of the valve seat and valve body of the present utility model;

[0022] Figure 3 It is a schematic diagram of the structure of the adjusting component of the present utility model;

[0023] Figure 4 It is a schematic diagram of the structure of the limiting component of the present utility model;

[0024] Figure 5 Schematic structural diagram of the elastic component of the present utility model;

[0025] Figure 6 Schematic cross-sectional structural diagram of the adjusting cylinder of the present utility model;

[0026] Figure 7 Schematic structural diagram of the adjusting screw of the present utility model;

[0027] Figure 8 Schematic structural diagram of the fixing component of the present utility model.

[0028] In the drawings, the list of components represented by each reference numeral is as follows:

[0029] 1. Valve seat; 2. Valve body; 3. I-shaped valve core; 4. Elastic component; 401. T-shaped guide post; 402. Guide groove; 403. Connecting ring; 404. Valve spring; 5. Adjusting component; 501. Adjusting disc; 502. Adjusting cavity; 503. Connecting groove; 504. Connecting block; 505. Adjusting screw; 506. Adjusting cylinder; 507. Adjusting groove; 508. Adjusting block; 509. Handle; 6. Fixing component; 601. Internal gear; 602. External gear; 603. T-shaped groove; 604. T-shaped rotating ring; 605. Fixing ring; 606. Return spring; 7. Limiting component; 701. T-shaped rotating shaft; 702. Limiting plate; 703. Limiting block; 704. Block; 705. Card slot; 8. Pressure relief groove; 9. Water pressure gauge. Specific embodiments

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the utility model with reference to the accompanying drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the utility model without creative efforts shall fall within the protection scope of the utility model.

[0031] In the description of the present utility model, it should be understood that the terms "opening", "upper", "lower", "top", "middle", "inner", etc. indicating the orientation or positional relationship are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the utility model.

[0032] Please refer to Figures 1 - 8As shown in the figure, the utility model relates to a safety valve with a valve spring that is easy to adjust, including a valve seat 1. A valve body 2 is fixedly installed on the top of the valve seat 1. An I-shaped valve core 3 is movably connected inside the valve seat 1. An elastic component 4 is arranged inside the valve body 2. The guiding end of the elastic component 4 is movably connected with the I-shaped valve core 3. An adjusting component 5 is arranged on the top of the elastic component 4. A fixing component 6 is arranged on the outer surface of the adjusting component 5. A limiting component 7 is rotatably connected to the top of the valve body 2.

[0033] When adjusting the threshold value of the safety valve, by rotating the limiting component 7, the limiting component 7 no longer limits the adjusting component 5. At this time, the adjusting component 5 can be pulled upward. When the adjusting component 5 moves to a certain height, the fixing component 6 no longer limits the adjusting component 5. Then rotate the adjusting component 5, so that the adjusting component 5 can press the elastic end of the elastic component 4, so that the overall elastic force of the elastic component 4 can be adjusted. After the adjustment is completed, move the adjusting component 5 to its original position and make the fixing component 6 fix and limit the adjusting component 5.

[0034] By pulling the adjusting component 5 upward, the adjusting component 5 can be rotated and the elastic force of the elastic component 4 can be adjusted. When the adjusting component 5 is in its original position, the fixing component 6 can limit the adjusting component 5. Thus, when the fixed end of the adjusting component 5 and the fixing component 6 are not separated, the adjusting component 5 will not rotate randomly. At the same time, the limiting component 7 can limit the top end of the adjusting component 5, so that the adjusting component 5 will not move upward randomly. Under the double limit of the fixing component 6 and the limiting component 7, the adjusting component 5 will not rotate when the safety valve is in use, so that the threshold value on the safety valve will not change due to accidental touch after being adjusted to an appropriate size, thus improving the overall stability of the installation valve during use.

[0035] In one embodiment, for the above-mentioned elastic component 4, the elastic component 4 includes a T-shaped guiding column 401. The top end of the T-shaped guiding column 401 is fixedly connected to the inner wall of the valve body 2. A guiding groove 402 is opened at the top of the I-shaped valve core 3. The T-shaped guiding column 401 is movably connected with the guiding groove 402. A connecting ring 403 is movably connected to the outer surface of the T-shaped guiding column 401. A valve spring 404 is fixedly connected between the connecting ring 403 and the valve seat 1.

[0036] When the pressure of the medium inside the valve seat 1 reaches a certain intensity, the pressure of the medium can push the T-shaped valve core 3 upward, so that the top of the T-shaped valve core 3 can push the valve spring 404 and the T-shaped valve core 3 can move upward, and the medium can flow inside the installed valve. When the T-shaped valve core 3 moves, the outer surface of the T-shaped guide post 401 can slide inside the guide groove 402. This setting ensures the stability of the T-shaped valve core 3 when it moves. At the same time, the valve spring 404 is arranged on the outer surface of the T-shaped guide post 401, so that the T-shaped guide post 401 can guide the valve spring 404. This setting prevents the valve spring 404 from bulging to one side when it undergoes elastic deformation.

[0037] In one embodiment, for the above-mentioned adjusting assembly 5, the adjusting assembly 5 includes an adjusting disc 501. An adjusting cavity 502 is formed at the top of the T-shaped guide post 401. The adjusting disc 501 is movably connected to the adjusting cavity 502. A connecting groove 503 is formed on the inner wall of the adjusting cavity 502. A connecting block 504 is fixedly connected between the adjusting disc 501 and the connecting ring 403. The connecting block 504 is movably connected to the connecting groove 503. An adjusting screw 505 is threadedly connected to the top of the T-shaped guide post 401. The bottom end of the adjusting screw 505 is rotatably connected to the adjusting disc 501. The adjusting assembly 5 further includes an adjusting cylinder 506. An adjusting groove 507 is formed on the inner wall of the adjusting cylinder 506. An adjusting block 508 is movably connected inside the adjusting groove 507. The adjusting block 508 is fixedly connected to the outer surface of the adjusting screw 505. A handle 509 is rotatably connected to the top of the adjusting cylinder 506.

[0038] Rotate the adjusting cylinder 506 through the handle 509, so that the adjusting cylinder 506 drives the adjusting screw 505 to rotate through the adjusting groove 507 and the adjusting block 508. At this time, since the adjusting screw 505 is threadedly connected to the T-shaped guide post 401, the rotating adjusting screw 505 can continuously move into the interior of the adjusting cavity 502. The adjusting block 508 also slides inside the adjusting groove 507 driven by the adjusting screw 505. At the same time, under the push of the adjusting screw 505, the connecting block 504 on the outside of the adjusting disc 501 can drive the connecting ring 403 to slide on the outer surface of the T-shaped guide post 401 and cooperate with the I-shaped valve core 3 to squeeze the valve spring 404, so that the elastic force of the valve spring 404 on the I-shaped valve core 3 can be adjusted. In summary, the adjusting cylinder 506 can rotate the adjusting screw 505 through the adjusting groove 507 and the adjusting block 508, and when the adjusting screw 505 moves downward, it can drive the adjusting block 508 to slide inside the adjusting groove 507. This setting makes it convenient to rotate the adjusting screw 505 by the adjusting cylinder 506 without the adjusting cylinder 506 moving downward together with the adjusting screw 505.

[0039] In one embodiment, for the above-mentioned fixing component 6, the fixing component 6 includes an internal gear 601, the internal gear 601 is fixedly connected to the inner wall of the valve body 2, an external gear 602 is meshed with the inner wall of the internal gear 601, the external gear 602 is fixedly connected to the adjusting cylinder 506, a T-shaped groove 603 is opened at the top of the T-shaped guide post 401, a T-shaped rotating ring 604 is rotatably connected inside the T-shaped groove 603, a fixing ring 605 is fixedly connected to the outer surface of the adjusting cylinder 506, and a return spring 606 is fixedly connected between the T-shaped rotating ring 604 and the fixing ring 605.

[0040] Pull the adjusting cylinder 506 upward through the handle 509, so that the adjusting cylinder 506 drives the external gear 602 to move upward together and makes the external gear 602 no longer mesh with the internal gear 601, so that the adjusting cylinder 506 can drive the adjusting screw 505 to rotate. When the adjusting cylinder 506 rotates, the fixing ring 605 can drive the T-shaped rotating ring 604 to rotate inside the T-shaped groove 603 through the return spring 606. After the adjustment is completed, release the handle 509. At this time, the return spring 606 can pull the adjusting cylinder 506 downward and make the external gear 602 on the adjusting cylinder 506 mesh with the internal gear 601 again. The settings of the T-shaped groove 603 and the T-shaped rotating ring 604 enable the return spring 606 to pull the adjusting cylinder 506 downward through the fixing ring 605 while the adjusting cylinder 506 can rotate normally.

[0041] In one embodiment, for the above-mentioned limiting component 7, the limiting component 7 includes a T-shaped rotating shaft 701, the T-shaped rotating shaft 701 is fixedly connected to the top of the internal gear 601, the outer surface of the T-shaped rotating shaft 701 is rotatably connected to a limiting plate 702, the inner wall of the limiting plate 702 is in contact with the outer surface of the adjusting cylinder 506, a limiting block 703 is fixedly connected to the top of the internal gear 601, a clamping block 704 is fixedly connected to one side of the limiting block 703, and a clamping groove 705 is formed in the limiting plate 702 corresponding to the clamping block 704.

[0042] By rotating the limiting plate 702 and making the limiting plate 702 no longer at the top of the external gear 602, at this time, the adjusting cylinder 506 can drive the external gear 602 to move upward and no longer mesh with the internal gear 601. Then, rotate the limiting plate 702 again and make the clamping groove 705 on one side of the limiting plate 702 snap onto the outer surface of the clamping block 704 on the limiting block 703. At this time, the limiting plate 702 can be at the bottom of the external gear 602. At this time, under the restriction of the limiting plate 702, the return spring 606 will not pull the adjusting cylinder 506 downward, so that it is not necessary to always pull the adjusting cylinder 506 when rotating the adjusting cylinder 506. In summary, the limiting plate 702 can produce different effects when at the top and bottom of the external gear 602, so that the overall practicality of the limiting component 7 is relatively high.

[0043] In one embodiment, for the above-mentioned valve seat 1, a pressure relief groove 8 is formed in the inner wall of the valve seat 1, the I-shaped valve core 3 is movably connected to the pressure relief groove 8, and a water pressure gauge 9 is fixedly installed on the outer surface of the valve seat 1 corresponding to the pressure relief groove 8.

[0044] When the medium pressure inside the valve seat 1 reaches a certain intensity, the I-shaped valve core 3 can slide inside the pressure relief groove 8, so that the medium can flow out of the valve seat 1 through the pressure relief groove 8. The water pressure gauge 9 can display the magnitude of the pressure inside the pressure relief groove 8, so that the operator can adjust the threshold value of the safety valve according to the value displayed by the water pressure gauge 9.

[0045] Through the above technical solutions: 1. By pulling the adjusting component 5 upward, the adjusting component 5 can be rotated to adjust the elastic force of the elastic component 4. When the adjusting component 5 is in its original position, the fixing component 6 can limit the adjusting component 5, so that the adjusting component 5 will not rotate randomly when the fixed end of the adjusting component 5 and the fixing component 6 are not separated. At the same time, the limiting component 7 can limit the top of the adjusting component 5, so that the adjusting component 5 will not move upward randomly. Under the double limitation of the fixing component 6 and the limiting component 7, the adjusting component 5 will not rotate when the safety valve is in use, so that the threshold value on the safety valve will not change due to accidental touch after being adjusted to an appropriate size, thus improving the overall stability of the installation valve during use; 2. By rotating the limiting plate 702 so that the limiting plate 702 is no longer at the top of the external gear 602, the adjusting cylinder 506 can drive the external gear 602 to move upward and no longer mesh with the internal gear 601. Then, rotate the limiting plate 702 again so that the card slot 705 on one side of the limiting plate 702 is stuck to the outer surface of the clamping block 704 on the limiting block 703. At this time, the limiting plate 702 can be at the bottom of the external gear 602. At this time, under the limitation of the limiting plate 702, the return spring 606 will not pull the adjusting cylinder 506 downward, so that it is not necessary to always pull the adjusting cylinder 506 when rotating the adjusting cylinder 506. In summary, the limiting plate 702 can produce different effects when it is at the top and bottom of the external gear 602, so that the overall practicality of the limiting component 7 is relatively high.

[0046] In the description of this specification, the descriptions referring to the terms "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0047] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments to better explain the principle and practical application of the utility model, so that those skilled in the art in the relevant technical field can understand and utilize the utility model well. The utility model is only limited by the claims and their full scope and equivalents.

Claims

1. A safety valve with a valve spring that is easy to adjust, comprising a valve seat (1), characterized in that, A valve body (2) is fixedly installed at the top of the valve seat (1). An I-shaped valve core (3) is movably connected inside the valve seat (1). An elastic component (4) is arranged inside the valve body (2). The guiding end of the elastic component (4) is movably connected with the I-shaped valve core (3). An adjusting component (5) is arranged at the top of the elastic component (4). A fixing component (6) is arranged on the outer surface of the adjusting component (5). A limiting component (7) is rotatably connected to the top of the valve body (2); The elastic component (4) includes a T-shaped guiding column (401). The top end of the T-shaped guiding column (401) is fixedly connected to the inner wall of the valve body (2). A guiding groove (402) is formed at the top of the I-shaped valve core (3). The T-shaped guiding column (401) is movably connected with the guiding groove (402). A connecting ring (403) is movably connected to the outer surface of the T-shaped guiding column (401). A valve spring (404) is fixedly connected between the connecting ring (403) and the valve seat (1); The adjusting component (5) includes an adjusting disc (501). An adjusting cavity (502) is formed at the top of the T-shaped guiding column (401). The adjusting disc (501) is movably connected with the adjusting cavity (502). A connecting groove (503) is formed on the inner wall of the adjusting cavity (502). A connecting block (504) is fixedly connected between the adjusting disc (501) and the connecting ring (403). The connecting block (504) is movably connected with the connecting groove (503). An adjusting screw (505) is threadedly connected to the top of the T-shaped guiding column (401). The bottom end of the adjusting screw (505) is rotatably connected to the adjusting disc (501); The adjusting component (5) further includes an adjusting cylinder (506). An adjusting groove (507) is formed on the inner wall of the adjusting cylinder (506). An adjusting block (508) is movably connected inside the adjusting groove (507). The adjusting block (508) is fixedly connected to the outer surface of the adjusting screw (505). A handle (509) is rotatably connected to the top of the adjusting cylinder (506); The fixing component (6) includes an internal gear (601). The internal gear (601) is fixedly connected to the inner wall of the valve body (2). An external gear (602) is meshed with the inner wall of the internal gear (601). The external gear (602) is fixedly connected to the adjusting cylinder (506). A T-shaped groove (603) is formed at the top of the T-shaped guiding column (401). A T-shaped rotating ring (604) is rotatably connected inside the T-shaped groove (603). A fixing ring (605) is fixedly connected to the outer surface of the adjusting cylinder (506). A reset spring (606) is fixedly connected between the T-shaped rotating ring (604) and the fixing ring (605); The limiting component (7) includes a T-shaped rotating shaft (701). The T-shaped rotating shaft (701) is fixedly connected to the top of the internal gear (601). The outer surface of the T-shaped rotating shaft (701) is rotatably connected to a limiting plate (702). The inner wall of the limiting plate (702) is in contact with the outer surface of the adjusting cylinder (506). A limiting block (703) is fixedly connected to the top of the internal gear (601). A clamping block (704) is fixedly connected to one side of the limiting block (703). The limiting plate (702) is provided with a clamping groove (705) corresponding to the clamping block (704).

2. The safety valve with a valve spring that is easy to adjust according to claim 1, characterized in that, A pressure relief groove (8) is formed in the inner wall of the valve seat (1). The I-shaped valve core (3) is movably connected to the pressure relief groove (8). A water pressure gauge (9) is fixedly installed on the outer surface of the valve seat (1) corresponding to the pressure relief groove (8).

Images