Combined safety valve

Abstract

The utility model relates to the technical field of safety valves, and discloses a combined safety valve, which is characterized in that a second external thread for connection is arranged on the outer surface of the inner end of a valve cap, and a second internal thread matched with the second external thread is arranged on the inner wall of the side end of a corresponding valve body; the position of the adjusting rod can be adjusted by rotating the hand wheel, so that the extension length of the valve rod and the opening pressure of the safety valve are changed, the pressure setting of the safety valve is easy to operate, and adjustment can be conveniently carried out according to the specific requirements of a system; when the pressure of fluid in a system is increased to exceed a set value of the safety valve, the fluid acts on the valve rod, pushes the valve rod open and allows the fluid to be discharged, and along with reduction of the pressure, the spring restores the original length and pushes the valve rod to return to the original position, and sealing is formed again. The pressure control mechanism based on the elastic force of the spring ensures that the safety valve can be accurately opened and closed under the set pressure, so that the pressure in the system is controlled.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of safety valve, concretely is a kind of combination safety valve. BACKGROUND

[0002] In industrial production process, safety valve is widely used in various fluid systems as important protection equipment to prevent system overpressure from causing equipment damage or safety accident, and the main function of safety valve is to automatically open when system pressure exceeds set value, release excess pressure, and automatically close when pressure reduces to safety range, to ensure the stable operation of system.

[0003] For example, a combination safety valve is proposed in Chinese patent with patent publication number CN218761647U, which realizes the opening and closing functions of the safety valve through specific structural design, and in use, the safety valve can automatically adjust the position of valve stem according to the fluid pressure change in the system to control the pressure in the system, however, the above-mentioned patent only solves the basic opening and closing problem of safety valve, and does not make sufficient optimization in the convenience of pressure setting, the enhancement of sealing performance and the easy maintenance of component structure, etc.

[0004] Specifically, the safety valve in CN218761647U patent may need complex operation or specific tools when adjusting opening pressure, which increases the difficulty of use and maintenance, and its sealing design may be relatively simple and cannot provide sufficient sealing effect, especially in high-pressure or corrosive fluid environment, the risk of fluid leakage is high, in addition, the component structure of the safety valve in the patent may be relatively complex, which is not convenient for disassembly and cleaning, affecting the reliability and stability of its long-term use, and in order to solve the above-mentioned problems, we propose a combination safety valve. CONTENT OF UTILITY MODEL

[0005] In view of the deficiencies of the prior art, the utility model provides a combination safety valve to solve the above-mentioned problems.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a combination safety valve, comprising a valve body and a valve cap, the inner surface of the inner end of the valve cap is provided with a second outer thread for connection, the inner wall of the side end of the valve body is provided with a second inner thread matched with the second outer thread, the second outer thread is installed inside the second inner thread, and further comprising:

[0007] A control assembly is installed inside the valve cap for adjusting the structure of the valve stem.

[0008] Preferably, the valve cap is provided with a hand wheel at the outer end, the hand wheel is internally fixedly installed with a mark cover for marking at the outer end, the inner wall of the hand wheel is provided with a clamping block for sliding corresponding to the side end of the mark cover, a matching protrusion is arranged on the outer surface of the outer end of the valve cap, and one end of the valve cap is installed in the interior of the hand wheel.

[0009] Preferably, the interior of the valve cap is fixedly installed with a first internal thread for connection corresponding to the position of the protrusion, a first external thread matched with the first internal thread is arranged on the surface of the adjusting rod, and the adjusting rod is installed in the interior of the valve cap.

[0010] Preferably, the control assembly comprises an adjusting rod, a spring seat, a spring and a valve rod, the adjusting rod is fixedly installed with a spring for buffering at the inner end surface, the other end of the spring is fixedly installed in the interior of the spring seat, and the valve rod for moving is sleeved at the center of the adjusting rod, and the inner end of the valve rod penetrates the surface of the spring seat.

[0011] Preferably, the outer end surface of the valve rod is provided with a thread, the outer end of the valve rod extends to the interior of the adjusting rod, the outer end of the valve rod is arranged on the outer side surface of the adjusting rod and is threadedly connected with a nut for fixation, and a gasket for buffering is arranged between the nut and the adjusting rod.

[0012] Preferably, the surface of the spring seat is sleeved with a sealing leather pad for sealing, the inner end center of the sealing leather pad is fixedly installed with a ball for buffering, and the inner end of the valve rod is fixedly installed in the interior of the ball.

[0013] Preferably, a red paper gasket for buffering is arranged at the connection between the valve cap and the valve body, and the red paper gasket is matched with the outer end surface of the sealing leather pad.

[0014] Compared with the prior art, the utility model provides a combined safety valve with the following beneficial effects:

[0015] 1、The combined safety valve can adjust the position of the adjusting rod by rotating the hand wheel, thereby changing the extension length of the valve rod and the opening pressure of the safety valve, which makes the pressure setting of the safety valve simple and easy to operate, and facilitates adjustment according to the specific needs of the system.

[0016] 2、The combination safety valve, in a static state, the valve rod is tightly pressed on the spring seat by the spring, is in close contact with the sealing surface in the valve body, forms effective sealing, simultaneously, the sealing gasket is located on the periphery of the spring seat, provides additional sealing effect, ensures that fluid does not leak from the joint between the valve body and the bonnet, the double sealing design greatly enhances the sealing performance of the safety valve, reduces the risk of fluid leakage, the red paper gasket is installed at the joint between the valve body and the bonnet, not only plays a buffering role, but also can be used as a visual indication of whether the safety valve is opened. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 It is a structural schematic diagram of the utility model;

[0019] Figure 3 It is a sectional view schematic diagram of the utility model;

[0020] Figure 4 It is a sectional view schematic diagram of the sealing gasket of the utility model;

[0021] Figure 5 It is a half sectional view schematic diagram of the utility model;

[0022] Figure 6 It is a side view schematic diagram of the bonnet of the utility model;

[0023] Figure 7 It is a side view schematic diagram of the valve body of the utility model.

[0024] In the drawing: 1, valve body;2, bonnet;3, sealing gasket;4, spring seat;5, valve rod;6, adjusting rod;7, red paper gasket;8, spring;9, hand wheel;10, nut;11, identification cover;12, gasket;13, protruding block;14, clamping block;15, ball;16, first outer thread;17, first inner thread;18, second outer thread;19, second inner thread. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0026] Please refer to Figures 1-7The utility model provides a kind of combination safety valve, including valve body 1 and bonnet 2, the outer surface of the inner end of bonnet 2 is provided with second external thread 18 for connection, the inner wall of the side end of corresponding valve body 1 is provided with second internal thread 19 matched with second external thread 18, second external thread 18 is installed inside second internal thread 19, further including: control assembly, for the structure of adjusting valve stem 5, is installed in the inside of bonnet 2, by rotating hand wheel 9 to adjust the position of adjusting rod 6, so as to change the pre-tightening force of spring 8 and the opening pressure of valve stem 5.

[0027] Further, the outer end of bonnet 2 is provided with hand wheel 9, the inner end of the outer end of hand wheel 9 is fixedly installed with identification cover 11 for marking, the inner wall of hand wheel 9 is provided with clamping block 14 for sliding corresponding to the side end of identification cover 11, corresponding to the outer surface of the outer end of bonnet 2 is provided with matching protrusion 13, and one end of bonnet 2 is installed in the inside of hand wheel 9, and hand wheel 9 controls bonnet 2 by the connection of clamping block 14 and protrusion 13.

[0028] Further, the inside of bonnet 2 is fixedly installed with first internal thread 17 for connection corresponding to the position of protrusion 13, the surface of corresponding adjusting rod 6 is provided with first external thread 16 matched with first internal thread 17, and adjusting rod 6 is installed in the inside of bonnet 2, and adjusting rod 6 is fixed in the inside of bonnet 2 by the engagement of first internal thread 17 and first external thread 16.

[0029] Further, the control assembly includes adjusting rod 6, spring seat 4, spring 8 and valve stem 5, the inner end surface of adjusting rod 6 is fixedly installed with spring 8 for buffering, the other end of spring 8 is fixedly installed in the inside of spring seat 4, and valve stem 5 for moving is sleeved at the center of adjusting rod 6, the inner end of valve stem 5 penetrates the surface of spring seat 4, and the opening pressure of safety valve is adjusted by rotating hand wheel 9 to drive adjusting rod 6 to rotate, because adjusting rod 6 and valve stem 5 are connected by thread, so rotating adjusting rod 6 will change the extension length of valve stem 5.

[0030] Further, the outer end surface of valve stem 5 is provided with thread, and the outer end of valve stem 5 extends to the inside of adjusting rod 6, and the outer end of valve stem 5 is provided with nut 10 for fixedly connecting on the outside surface of adjusting rod 6, and gasket 12 for buffering is installed between nut 10 and adjusting rod 6, and one end of valve stem 5 is fixed by nut 10 and gasket 12, and one end of valve stem 5 is fixed in the inside of adjusting rod 6.

[0031] Further, the surface of the spring seat 4 is sleeved with a sealing gasket 3 for sealing, and the inner end of the sealing gasket 3 is fixedly installed with a ball 15 for buffering, and the inner end of the valve stem 5 is fixedly installed in the ball 15, and the sealing gasket 3 is located at the periphery of the spring seat 4, which provides additional sealing effect and ensures that the fluid does not leak from the connection between the valve body and the bonnet.

[0032] Further, a red paper gasket 7 for buffering is installed at the connection between the bonnet 2 and the valve body 1, and the red paper gasket 7 matches the outer end surface of the sealing gasket 3, and the red paper gasket 7 is installed at the connection between the valve body 1 and the bonnet 2, which not only plays a buffering role, but also serves as a visual indication of whether the safety valve is opened.

[0033] Structure description: 1. Valve body: The valve body is the main structure of the combined safety valve, responsible for containing and supporting the internal components, and as the main bearing part of fluid pressure, it is designed to be strong and durable, capable of withstanding high fluid pressure and temperature. The valve body is internally provided with a sealing surface and a flow channel to ensure smooth discharge of fluid when needed, while forming an effective seal when the safety valve is closed.

[0034] 2. Bonnet: The bonnet is located at the side end of the valve body and is tightly fixed with the valve body through threaded connection. The bonnet not only plays a role in protecting the internal components, but also provides a matching space for components such as the valve stem through its design, ensuring the normal operation of the safety valve.

[0035] 3. Sealing gasket: The sealing gasket is located at the periphery of the spring seat, closely adhering to the connection between the valve body and the bonnet. It is soft and corrosion-resistant, providing additional sealing effect and effectively preventing fluid leakage from the small gap between the valve body and the bonnet.

[0036] 4. Spring seat: The spring seat is a key component inside the valve body, used to support and fix the spring. It is designed with a specific shape and size to ensure that the spring can be correctly installed and work stably. The spring seat also cooperates with the valve stem to press the valve stem against the sealing surface through the spring force.

[0037] 5. Valve stem: The valve stem is a movable component in the combined safety valve used to control the flow of fluid. Its end is in close contact with the sealing surface inside the valve body, forming a seal. When the fluid pressure rises above the set value, the valve stem will be pushed away, allowing the fluid to be discharged. The valve stem is provided with threads and cooperates with the adjusting rod to change the opening pressure of the safety valve by adjusting the extension length of the valve stem.

[0038] 6. Adjusting rod: The adjusting rod is connected to the valve stem through threaded connection. Its design allows users to adjust the extension length of the valve stem by turning the handwheel. The adjusting rod is provided with scales or marks to facilitate users to accurately set the opening pressure of the safety valve.

[0039] 7. Red paper gasket: The red paper gasket is installed at the connection between the valve body and the bonnet, not only serving as a buffer, but also as a visual indicator of whether the safety valve is open. When the safety valve opens, the red paper gasket will be pushed up, reminding the operator to pay attention;

[0040] 8. Spring: The spring is a key elastic element in the combined safety valve. Its elastic force is used to press the valve stem against the sealing surface to form a seal. When the fluid pressure rises, the spring will be compressed, allowing the valve stem to move and release pressure. When the pressure decreases, the spring restores its elasticity and pushes the valve stem back to its original position;

[0041] 9. Handwheel: The handwheel is an operating component used by the user to adjust the opening pressure of the safety valve. It is designed to be easy to hold and rotate. By rotating the handwheel, the adjusting rod can be rotated, thereby changing the extension length of the valve stem and the opening pressure of the safety valve;

[0042] 10. Nut: The nut is used to fix the connection between the bonnet and the valve body, ensuring a tight fit between them. The design of the nut allows the user to tighten or loosen the connection by rotating it;

[0043] 11. Identification cover: The identification cover is usually installed on the valve body or bonnet and is used to identify information such as the model, specification, or working pressure of the safety valve. It is designed to be easy for the user to view and identify;

[0044] 12. Gasket: The gasket (different from the sealing gasket) is located at the connection between the nut and the adjusting rod, providing additional fixing effect,

[0045] 13. Lugs: Lugs may be located in certain parts of the valve body or bonnet, used to cooperate with other components or provide additional support and fixing effect;

[0046] 14. Clamping block: The clamping block is a protruding structure installed on the handwheel, used to achieve clamping connection with the nut, ensuring stable connection between components,

[0047] 15. Ball: The ball is located on the moving path of the valve stem and may serve as a buffer, guide, or friction reducer, ensuring that the valve stem can be smoothly and reliably opened and closed;

[0048] 16. First external thread and first internal thread: The first external thread and the first internal thread are located at the connection between the valve body and the bonnet, respectively, for threaded connection between them;

[0049] 17. Second external thread and second internal thread: The second external thread and the second internal thread may be located at the connection between the adjusting rod and the valve stem or other components, used for threaded connection and adjustment of their relative positions.

[0050] Usage Instructions

[0051] Working principle: under the influence of external pressure or temperature change, the safety valve is in a static state, at this time, the valve rod 5 is tightly pressed on the spring seat 4 by the spring 8, and the end of the valve rod 5 is in close contact with the sealing surface in the valve body, forming an effective seal, the sealing gasket 3 is located on the periphery of the spring seat 4, providing additional sealing effect, ensuring that the fluid will not leak from the connection between the valve body and the bonnet, the red paper gasket 7 is installed at the connection between the valve body and the bonnet, not only plays a buffering role, at the same time, the red paper gasket 7 further fixes the sealing gasket 3, when the fluid pressure in the system rises to exceed the set value of the safety valve, the fluid will act on the end of the valve rod 5, trying to push it away, the spring 8 begins to be compressed, at the same time, the valve rod 5 gradually moves outward along the threads of the adjusting rod 6, in this process, the sealing surface at the end of the valve rod 5 gradually separates from the sealing surface in the valve body, allowing the fluid to be discharged through the valve body, the components such as ball 15 and gasket 12 play a role in buffering and stabilizing the movement of valve rod 5 in this process, ensuring that the valve rod 5 can be smoothly and reliably opened, with the discharge of fluid, the pressure in the system gradually decreases, when the pressure is lower than the set value of the safety valve, the spring 8 begins to restore its original length, pushing the valve rod 5 back to the original position, the sealing surface at the end of the valve rod 5 recontacts with the sealing surface in the valve body, forming an effective seal, preventing further leakage of fluid, when it is necessary to adjust the pressure of the safety valve, the hand wheel 9 can be rotated to drive the adjusting rod 6 to rotate, because the adjusting rod 6 and the valve rod 5 are connected by threads, therefore, rotating the adjusting rod 6 will change the extension length of the valve rod 5, thereby adjusting the opening pressure of the safety valve.

[0052] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A combined safety valve comprising a valve body (1) and a bonnet (2), the bonnet (2) being provided with a second external thread (18) on the outer surface of the inner end for connection, a second internal thread (19) being provided on the inner wall of the side end of the valve body (1) corresponding to the second external thread (18), the second external thread (18) being installed inside the second internal thread (19), characterized in that, Also include: Control components, installed in the valve cap (2) inside, for the structure of the valve stem (5) adjustment.

2. A combined safety valve according to claim 1, characterized in that: The valve cap (2) is provided with a hand wheel (9) at the outer end, and the hand wheel (9) is fixedly installed with a mark cover (11) for marking inside the outer end. The inner wall of the hand wheel (9) is provided with a clamping block (14) for sliding corresponding to the side end of the mark cover (11). A matching protrusion (13) is arranged on the outer surface of the outer end of the valve cap (2), and one end of the valve cap (2) is installed inside the hand wheel (9).

3. A combined safety valve according to claim 2, characterized in that: The inside of the valve cap (2) is fixedly installed with a first inner thread (17) for connection corresponding to the position of the protrusion (13). A first outer thread (16) matching the first inner thread (17) is arranged on the surface of the adjusting rod (6), and the adjusting rod (6) is installed inside the valve cap (2).

4. A combined safety valve according to claim 1, characterized in that: The control assembly includes an adjusting rod (6), a spring seat (4), a spring (8) and a valve stem (5). The adjusting rod (6) is fixedly installed with a spring (8) for buffering on the inner end surface. The other end of the spring (8) is fixedly installed in the inside of the spring seat (4), and the valve stem (5) for moving is sleeved at the center of the adjusting rod (6). The inner end of the valve stem (5) penetrates the surface of the spring seat (4).

5. A combined safety valve according to claim 4, characterized in that: The outer end surface of the valve stem (5) is provided with a thread, and the outer end of the valve stem (5) extends to the inside of the adjusting rod (6). The outer end of the valve stem (5) is arranged on the outer side surface of the adjusting rod (6) and is connected with a nut (10) for fixing. A gasket (12) for buffering is installed between the nut (10) and the adjusting rod (6).

6. A combined safety valve according to claim 4, characterized in that: The surface of the spring seat (4) is sleeved with a sealing rubber pad (3) for sealing. The inner end of the sealing rubber pad (3) is fixedly installed with a ball (15) for buffering at the center. The inner end of the valve stem (5) is fixedly installed in the inside of the ball (15).

7. A combined safety valve according to claim 1, characterized in that: The connection between the valve cap (2) and the valve body (1) is provided with a red paper gasket (7) for buffering, and the red paper gasket (7) matches the outer end surface of the sealing rubber pad (3).

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