Quick-release safety valve with pilot and non-self-lifting adjustment

Abstract

A quick-release safety valve with pilot and non-self-lifting adjustment comprises a valve body assembly, an adjusting assembly, a valve element diaphragm assembly and a hoop assembly. The valve body assembly comprises a valve body (1) and a cup body (9), the valve body is of a main structure of the safety valve, an inlet / outlet, a valve seat and a supporting seat (3) are arranged on the valve body, the supporting seat is used for guiding and limiting a valve core, a hoop assembly (12) is used for fixing the valve body and the cup body through a hoop, and a valve core diaphragm assembly (5) which extends to the valve seat and can be matched with a valve seat hole and an adjusting assembly are arranged in the cup body; the valve element membrane assembly comprises a valve element and a valve element rod, the valve element (5.1) is arranged at a valve port of the valve seat, the adjusting assembly comprises a pressure adjusting spring (6), an adjusting seat (7), an adjusting screw (8) and a first O-shaped ring (8.1), and the adjusting screw is screwed with a thread in the middle of the adjusting seat and matched with the first O-shaped ring and the pressure adjusting spring to form the adjusting assembly; the adjusting seat comprises two boss structures (7.1) which are matched with the sliding groove structures (9.2) of the cup body to achieve vertical movement and circumferential limiting of the adjusting seat.

Description

Technical Field

[0001] This utility model relates to the field of safety valve technology, specifically to a quick-release safety valve with pilot and non-self-lifting adjustment, which can be widely used in industrial fields such as chemical, petroleum, power, and environmental protection, as well as in civil pipeline systems, to ensure system pressure safety. Background Technology

[0002] In the development of the safety valve industry, the technological limitations of traditional products have gradually become apparent. Currently, most mainstream safety valves rely on external adjusting screws to regulate overflow pressure. This operating mode not only requires a large operating space outside the equipment, leading to insufficient overall equipment compactness and reduced space utilization, but also increases the risk of misoperation in complex working conditions. Furthermore, the piston-type safety valves widely used in the market, due to their numerous internal components and precise fit, are prone to jamming during long-term operation, resulting in delayed pressure response and difficulty in quickly opening and releasing pressure when system pressure is abnormal, posing serious safety hazards. Simultaneously, traditional safety valves typically use 4 to 6 bolts for rigid connection between the adjusting spring chamber and the valve body. This fixing method requires significant time and manpower for bolt disassembly and installation during equipment maintenance, repair, and replacement, reducing equipment operation and maintenance efficiency and increasing operating costs for enterprises. Existing safety valve adjustments are inconvenient: the adjusting springs of traditional safety valves are prone to self-elevation due to vibration, pressure fluctuations, and other factors during use, causing changes in the safety valve's set pressure, affecting its normal pressure protection function, and reducing the stability and reliability of the safety valve's operation. For example, the CN 222702709 U safety valve for pressure pipelines solves the problem of easy opening deviation by optimizing the design of the valve stem and sealing components;

[0003] Traditional piston-type valves suffer from insufficient sealing: after prolonged use, the valve disc and seat are prone to wear, leading to leakage risks. For example, the "high-precision spring-loaded safety valve with back pressure resistance" (CN222559287U) uses a piston-type dynamic sealing structure to eliminate the influence of back pressure in the outlet cavity. Traditional safety valves are difficult to disassemble: when maintenance, repair, or replacement is required, it often consumes a significant amount of time and manpower, increasing maintenance costs and equipment downtime. Summary of the Invention

[0004] The purpose of this utility model is to propose a quick-release safety valve with pilot and non-self-lifting adjustment, which has a stable and reliable non-self-lifting structure to ensure that the safety valve always maintains a stable pressure setting under complex dynamic working conditions. The universal threaded interface 9.1 on the cup body has dual functions of fault overflow and external pilot (providing a certain working pressure fluid, etc.). The quick-release fastening system: the clamp structure completely innovates the traditional bolt fastening method.

[0005] The technical solution of this utility model is a quick-release safety valve with pilot and non-self-lifting adjustment, comprising four main parts: a valve body assembly, an adjustment assembly, a valve core diaphragm assembly, and a clamp assembly. The valve body assembly includes a valve body 1 and a cup body 9. The valve body 1 is the main structure of the safety valve, and it is provided with an inlet / outlet, a valve seat, and a support 3. The support 3 provides valve core guidance and limitation. The clamp assembly 12 fixes the valve body and the cup body (adjacent connection points) with clamps. The cup body 9 contains a valve core diaphragm assembly 5 that extends to the valve seat and can match the valve seat hole, and an adjustment assembly. The clamp assembly 12 fixes the valve body and the cup body with clamps. The cup body contains a valve core diaphragm assembly 5 that extends to the valve seat and can match the valve seat hole, and an adjustment assembly. The valve core diaphragm assembly includes a valve core and a valve... The valve core 5.1 is placed at the valve port of the valve seat. The adjusting assembly includes a pressure adjusting spring 6, an adjusting seat 7, an adjusting screw 8, and a first O-ring 8.1. The adjusting screw 8 is screwed into the adjusting seat 7 through a thread, and together with the first O-ring 8.1 and the pressure adjusting spring 6, they form the adjusting assembly. The above describes the components and connection structure of a quick-release safety valve with pilot and non-self-lifting adjustment. The valve core at the valve port of the valve seat is used for opening and closing the valve inlet and outlet. The diaphragm connected to it is used for sealing the inlet and outlet chambers and the cup body chamber, i.e., the upper and lower chambers. The adjusting seat 7 is characterized by having two boss structures 7.1, which cooperate with the sliding groove structure 9.2 of the cup body to realize the vertical movement and circumferential limitation of the adjusting seat 7, and cooperate with the adjusting screw fixing groove at the bottom of the cup body to realize the threaded non-self-lifting structure.

[0006] Furthermore, a retaining ring 4 is provided to hold the valve body and is located at the lower part of the support seat to fix the support seat.

[0007] Furthermore, the valve core is placed at the valve port of the valve seat for opening and closing the inlet and outlet. The diaphragm connected to it is used for sealing the inlet and outlet chambers and the cup body chamber, i.e., the upper and lower chambers. The lower end of the valve core is connected to the valve core rod, and the lower end of the valve core rod passes through the baffle, diaphragm, and spring seat and is screwed onto the self-locking nut. The pressure regulating spring 6 in the cup body is sleeved on the valve core rod. The upper end of the pressure regulating spring 6 presses against the valve plate, and the lower end presses against the adjusting seat. The upper end of the adjusting screw 8 contacts the valve core rod, and the middle end of the adjusting screw 8 rotates in the thread in the middle of the adjusting seat. The lower end of the adjusting screw 8 is used to adjust the upper and lower positions of the adjusting screw in the thread in the middle of the adjusting seat. The upper and lower positions are used to adjust the opening pressure of the spring, the accommodation of the adjusting seat 7, and the compression of the spring.

[0008] The valve body 1 and the cup body 9 are fixed and connected by a clamp structure. The cup body is provided with a (general specification) threaded interface 9.1.

[0009] The basic pressure regulation and overflow principle of this utility model are as follows:

[0010] Fluid enters the valve body through the IN inlet. By rotating the adjusting screw 8, the adjusting seat 7 rises vertically along the sliding groove 9.2, directly compressing the spring. The adjusting seat 7 can compress the adjusting spring 6 during its ascent via the boss structure. The compressed adjusting spring 6 generates elastic force, which, through squeezing the valve core diaphragm assembly 5, causes the valve core 5.1 to tightly fit against the valve port via the guide hole 3.1, forming a reliable seal and preventing fluid flow.

[0011] When the fluid pressure at the inlet gradually increases and exceeds the spring force set by the adjusting spring 6, the fluid flows through the orifice 3.2, causing the valve core diaphragm assembly 5 to move downwards, opening the valve port, and allowing the fluid to overflow through the OUT outlet, thereby releasing system pressure and ensuring system safety. By precisely adjusting the compression degree of the adjusting spring 6, the opening pressure of the safety valve can be flexibly set to adapt to different operating conditions.

[0012] External pilot-operated precision control principle: When the system requires high pressure control accuracy, the external pilot-operated control function can be activated. First, the base pressure of the safety valve is set by adjusting screw 8 to determine the initial pressure control range. Then, a small-pressure pilot gas is connected from the threaded interface 9.1 of the cup body. The pressure of the pilot gas is used to assist in adjustment, achieving further precise control of the safety valve opening pressure. This pilot control method can compensate for the insufficient accuracy when relying solely on adjusting the spring for pressure regulation, meeting the pressure control requirements of precision systems.

[0013] Multiple Pressure Regulation Modes: This safety valve supports multiple pressure regulation methods, allowing users to flexibly select the appropriate mode based on actual usage scenarios and operating conditions. The pressure can be set by using the adjusting spring 6 alone and changing the spring compression via the adjusting screw 8; or by introducing pilot air through the threaded interface 9.1 and utilizing the pilot air pressure for pressure regulation; or by combining the adjusting spring 6 with pilot air regulation to fully leverage the advantages of both and achieve more precise and flexible pressure control.

[0014] Safety protection mechanism: When the flowing medium is a hazardous gas or liquid, to prevent fluid leakage due to accidental damage to the valve core diaphragm assembly 5, a leak pipe can be connected through the threaded interface 9.1 on the cup body. The other end of the leak pipe is connected to a leak box or safety gas cylinder. Once the valve core diaphragm assembly 5 is damaged, the leaked fluid will be guided to a safe storage device through the leak pipe, preventing the fluid from leaking directly into the atmosphere and causing safety accidents or environmental pollution, thus providing additional protection for the safe operation of the system.

[0015] Non-self-lifting structure principle: During normal operation of the safety valve, the elastic force generated by the adjusting spring 6 applies a reverse force to the adjusting seat 7. The adjusting seat 7 has two protrusions 7.1 that engage with grooves on the inner wall of the cup body. Due to the guiding constraint of the sliding groove 9.2, the adjusting seat 7 cannot rotate in the circumferential direction, allowing the reverse force to be effectively transmitted to the adjusting screw 8. The end of the adjusting screw 8 is tightly engaged with the sliding groove 9.2 inside the cup body 9. When the reverse force is transmitted to the adjusting screw 8, a large frictional force is generated between the bottom of the screw and the groove of the cup body. When the safety valve is subjected to vibration or other external interference, this frictional force effectively prevents the adjusting screw 8 from rotating, thereby preventing the adjusting seat 7 from sliding down. The stability of the adjusting seat 7 position ensures that the compression of the adjusting spring 6 remains constant, and the spring force it generates will not change due to external interference, thus ensuring the stability and accuracy of the safety valve's opening pressure setting and effectively improving the reliability of the safety valve under complex operating conditions.

[0016] This utility model features a pilot-operated, non-self-lifting adjustable quick-release safety valve, achieving a comprehensive upgrade in product performance through innovative design and advanced technology. The internal structure has been deeply optimized, with all metal components made of 316 stainless steel. Thanks to its excellent corrosion resistance and high strength, it can easily withstand various harsh working conditions. The valve core undergoes a special surface hardening treatment, making its hardness significantly higher than that of the valve port. Even under wear during long-term operation, it can achieve a tighter fit through natural break-in, effectively enhancing sealing performance and significantly reducing the risk of media leakage. The seals and diaphragm are made of highly corrosion-resistant materials, further improving the product's reliability and stability in complex media environments. In addition, the product features an innovative universal threaded interface on the cup body, which offers powerful functional expandability: when connected to pilot gas, it enables high-precision pressure control to meet the refined pressure regulation requirements of different operating conditions; it can be connected to an overflow pipe, which can guide fluid discharge in a timely manner in the event of a valve body malfunction, preventing fluid leakage that could cause environmental pollution and safety accidents; and with the addition of a plug, it can effectively isolate external dust, rainwater, and other impurities, ensuring a clean internal environment for the valve body and guaranteeing stable equipment operation.

[0017] Beneficial Effects: This utility model possesses four core competitive advantages: 1. Multi-mode Intelligent Pressure Regulating System: It pioneers three pressure regulating modes: integrated single-spring regulation, spring and pilot coordinated precision regulation, and single-pilot regulation. Users can freely switch between modes through simple operation according to actual working conditions. Whether it is a conventional pressure control scenario or a special working condition with extremely high precision requirements, it can be accurately adapted, providing comprehensive protection for the safe operation of the system. 2. Stable and Reliable Non-Self-lifting Structure: The unique non-self-lifting design eliminates the influence of external interference factors such as vibration and impact on the pressure regulation accuracy at the source, ensuring that the safety valve maintains a stable pressure setting under complex dynamic working conditions, effectively avoiding safety accidents caused by pressure drift, and building a solid defense for the safe operation of the equipment. 3. Multi-functional Universal Interface Design: The universal threaded interface on the cup body has both external overflow and external pilot functions. By flexibly matching different pipelines and accessories, the function of the safety valve can be quickly expanded and upgraded, greatly improving the equipment's adaptability to diverse working conditions and reducing the enterprise's equipment procurement and maintenance costs. 4. Highly efficient and convenient quick-release fastening system: The independently improved (non-standard) clamp structure completely revolutionizes the traditional bolt fastening method. During equipment maintenance and repair, no additional upper or lower maintenance space is required; safety valves can be quickly disassembled and installed with simple operations, significantly reducing equipment downtime and greatly improving operation and maintenance efficiency. Simultaneously, the clamp fastening method supports 360° adjustment of the cup body thread, greatly facilitating pipeline connection operations and effectively improving installation convenience and flexibility. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the valve core diaphragm assembly structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the adjusting seat 7.1 with a boss according to this utility model;

[0021] Figure 4 This is a schematic diagram of the inner end face structure of the cup body 9 of this utility model;

[0022] Figure 5 For the present utility model Figure 3 , Figure 4 Schematic diagram of the combined structure.

[0023] Figure 6 This is a schematic diagram of the support base 3 of this utility model;

[0024] Figure 7 This is a schematic diagram of the clamp assembly structure of this utility model. Detailed Implementation

[0025] The components and accessories of the finished product are as follows: as shown in the figure, valve body 1, clamp assembly 2, support seat 3, retaining ring 4, valve core diaphragm assembly 5, pressure regulating spring 6, adjusting seat 7, adjusting screw 8, first O-ring 8.1, cup body 9, PTFE gasket 10, PTFE-O-ring 11, 9.1 threaded interface, used for input pilot airflow or overflow pipe.

[0026] This utility model comprises a valve body assembly, an adjusting assembly, a valve core diaphragm assembly, and a clamp assembly. The valve body assembly includes a valve body 1 and a cup body 9. The valve body 1 is the main structure of the safety valve, and is provided with an inlet / outlet, a valve seat, and a support seat 3. The support seat 3 provides valve core guidance and limitation, and is provided with a clamp assembly 2 to fix and remove the valve body and the cup body. The cup body 9 contains a valve core diaphragm assembly 5 that extends to the valve seat and can match the valve seat hole, and an adjusting assembly. The adjusting assembly includes a pressure regulating spring 6, an adjusting seat 7, and an adjusting screw 8. The adjusting screw 8 is screwed into the adjusting seat 7 and fitted with a first O-ring 8.1 and the pressure regulating spring 6 to form the adjusting assembly. The above describes the components and connection structure of a quick-release safety valve assembly with pilot and non-self-lifting adjustment.

[0027] The specific connection method is as follows: the valve body 1 and the cup body 9 are in contact through the intermediate PTFE-O ring 11, diaphragm 5.6 and PTFE gasket 10, and are fastened together using the clamp assembly 12.

[0028] A retaining ring 4 is provided to fix the support seat; the movement of the valve core diaphragm assembly 5 causes the valve port to open and close and the upper and lower cavities to seal; a pressure regulating spring 6 inside the cup body 9 is used to realize the spring elastic force as the valve opening pressure; an adjusting seat 7 supports and compresses the spring; an adjusting screw 8 adjusts the elastic force of the spring; the first O-ring 8.1 is used for sealing the cup body to the outside; the cup body 9 houses the spring and accessories; a PTFE gasket 10 is used to cooperate with the lower seal of the diaphragm; and a PTFE-O-ring 11 is used for the upper seal of the diaphragm. The sliding groove 9.2 inside the cup body 9 provides linear guidance for the adjusting seat and limits circumferential movement. The valve core 5.1 passes through the center hole of the baffle 5.3, the diaphragm 5.6, and the spring seat 5.5, so that the thread at the tail end of the valve core 5.1 is fastened to the self-locking nut 5.4 to form the valve core diaphragm assembly with the second O-ring 5.2.

[0029] The valve core diaphragm assembly 5 includes a second O-ring 5.2, a baffle 5.3, a self-locking nut 5.4, a spring seat 5.5, and a diaphragm 5.6; the up-and-down movement of the valve core 5.1 (upper end) is used for the opening and closing of the valve; the second O-ring 5.2 is used for the sealing between the valve body and the cup body; the baffle 5.3 is used for the connection between the valve core and the diaphragm; the self-locking nut 5.4 is used for the fixing between the valve core and the diaphragm; the spring seat 5.5 supports the spring; and the diaphragm 5.6 moves with the valve core and seals the upper and lower cavities.

[0030] The valve body assembly includes a valve body 1 and a cup body 9. The connection method is as follows: I. The valve body 1 and the cup body 9 are in contact through the intermediate PTFE-O ring 11, diaphragm 5.6 and PTFE gasket 10, and are fastened together using a clamp assembly 12.

[0031] The adjusting assembly includes a pressure regulating spring 6, an adjusting seat 7, an adjusting screw 8, and a first O-ring. The adjusting screw 8 engages with the threaded connection in the adjusting seat 7, and together with the first O-ring 8.1 and the pressure regulating spring 6, forms the adjusting assembly. The adjusting seat 7 has two boss structures 7.1 that cooperate with the sliding groove 9.2 to adjust the spring. The sliding groove 9.2 on the inner wall of the cup provides linear guidance for the adjusting seat 7 and limits its movement in the circumferential direction. When the spring is compressed, the elastic force on the valve core increases. The adjusting screw 8 adjusts the elastic force of the spring. The first O-ring 8.1 is used for sealing the cup body against the outside environment. The cup body 9 houses the spring and accessories. The PTFE gasket 10 is used for the lower seal of the diaphragm, and the PTFE-O-ring 11 is used for the upper seal of the diaphragm.

[0032] Schematic diagram of clamp assembly 12, including clamp 12.1, hexagonal screw 12.2, hexagonal nut 12.3, and spring washer 12.4.

[0033] Used to control an adjustable, constant pressure upstream of the valve. A spring keeps the valve closed. When the inlet pressure increases, it pushes open the valve core, causing the valve to open.

[0034] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A quick-release safety valve with pilot operation and non-self-lifting adjustment, characterized in that, The system includes a valve body assembly, an adjustment assembly, a valve core diaphragm assembly, and a clamp assembly. The valve body assembly includes a valve body (1) and a cup body (9). The valve body is the main structure of the safety valve. The valve body is provided with an inlet and outlet, a valve seat, and a support seat (3). The support seat provides valve core guidance and limit. The clamp assembly (12) fixes the valve body and the cup body with clamps. The cup body is provided with a valve core diaphragm assembly (5) that extends to the valve seat and can match the valve seat hole, and an adjustment assembly. The valve core diaphragm assembly includes a valve core and a valve core rod. The valve core (5.1) is placed at the valve port of the valve seat. The adjustment assembly includes a pressure regulating spring (6), an adjustment seat (7), an adjustment screw (8), and a first O-ring (8.1). The adjustment screw (8) is screwed into the adjustment seat (7) and fitted with the first O-ring and the pressure regulating spring to form the adjustment assembly. The adjustment seat contains two boss structures (7.1), which cooperate with the sliding groove structure (9.2) of the cup body to realize the up and down movement of the adjustment seat and the circumferential limit.

2. The quick-release safety valve with pilot and non-self-lifting adjustment according to claim 1, characterized in that, A retaining ring (4) is provided to hold the valve body and is located at the lower part of the support seat to fix the support seat.

3. The quick-release safety valve with pilot and non-self-lifting adjustment according to claim 1, characterized in that, The lower end of the valve core (5.1) is connected to the valve core rod. The lower end of the valve core rod passes through the baffle, diaphragm and spring seat and is screwed onto the self-locking nut. The pressure regulating spring (6) in the cup body is sleeved on the valve core rod. The upper end of the pressure regulating spring (6) presses against the spring seat and the lower end presses against the adjusting seat. The middle end of the adjusting screw (8) rotates in the thread in the middle of the adjusting seat. The lower end of the adjusting screw (8) is used to adjust the upper and lower positions of the adjusting screw in the thread in the middle of the adjusting seat. The upper and lower positions are used to realize the opening pressure of the spring, the accommodation of the adjusting seat (7) and the adjustment of the compression of the spring.

4. The quick-release safety valve with pilot and non-self-lifting adjustment according to claim 1, characterized in that, The valve body (1) and the cup body (9) are fixed and connected by a back-label clamp structure.

5. The quick-release safety valve with pilot and non-self-lifting adjustment according to claim 1, characterized in that, The cup body is provided with a threaded interface (9.1).

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