Parallel pilot safety valve

Abstract

A second valve clack comprises a large column, a small column and a cap head which are connected, the upper end of the large column abuts against a first valve clack, the lower end of the large column extends into a through groove, an exhaust passage extending from the outer wall of the upper end of the large column to the outer wall of the small column is arranged in the second valve clack, and an air inlet passage extending from the lower surface of the cap head to the upper surface of the cap head is arranged. The bottom cover part is connected to the lower end of the guide valve body and extends into the lower groove. The two ends of the air inlet pipe are communicated with the lower surface of the cap and the upstream of the flow channel respectively. According to the parallel type pilot safety valve, through the innovative design of integration of the main valve parallel flow channel and the pilot valve, the advantages of low-resistance circulation and horizontal installation adaptability of the parallel type valve and the advantages of high-precision pressure control and quick response of the pilot valve are integrated, and meanwhile the new performance of back pressure self-adaption and zero-leakage sealing is newly added; the anti-backflow valve is suitable for scenes such as liquefied petroleum gas stations, hydraulic systems, chemical pipelines and the like with high requirements on pressure stability, circulation efficiency and anti-backflow.

Description

Technical Field

[0001] This utility model relates to the field of safety valves, and in particular to a parallel pilot-operated safety valve. Background Technology

[0002] In existing technologies, parallel safety backflow valves, due to their parallel flow path and valve disc movement direction, offer advantages such as low flow resistance, convenient horizontal installation, and good backflow prevention, making them widely used in backflow piping systems. However, relying on direct spring actuation results in low pressure control accuracy, susceptibility to malfunctions during back pressure fluctuations, and delayed overpressure response. Pilot-operated safety valves control the main valve opening by sensing pressure signals through a pilot valve, offering precise pressure control, strong back pressure adaptability, and rapid response. However, traditional structures employ a vertical flow path design, resulting in higher flow resistance and lacking a dedicated backflow prevention mechanism, making them unsuitable for horizontal installation and backflow protection requirements in backflow piping systems. Existing solutions that integrate pilot valves into parallel backflow valves often use an external design where the pilot valve is perpendicular to the main valve flow path, leading to flow path bends, increased pressure loss, and undermining the low-resistance advantage of parallel valves. Furthermore, they fail to address the coordination issue between pilot control and backflow prevention functions, resulting in structural redundancy and complex maintenance. Therefore, an integrated valve design that organically combines the core advantages of both types of valves while avoiding structural conflicts and performance shortcomings is needed. Utility Model Content

[0003] The main purpose of this invention is to provide a parallel pilot safety valve, which aims to solve the problem of operational stability defects in safety valves.

[0004] To achieve the above objectives, this utility model provides a parallel pilot-operated safety valve, comprising:

[0005] The main valve body has a flow channel with a valve seat in the middle;

[0006] A guide sleeve is installed on the valve seat and has a window on it;

[0007] The valve core slides against the guide sleeve to close and release the window;

[0008] A valve cover is connected to the main valve body and closes the upper end of the guide sleeve;

[0009] A first spring is disposed between the valve core and the valve cover;

[0010] A pilot valve includes a top cover, a pilot valve body, a bottom cover, two valve discs, an outlet pipe, and an inlet pipe. The upper, middle, and lower ends of the pilot valve body are respectively provided with a connected, cylindrical upper groove, a through groove, and a lower groove. A valve disc is slidably disposed within the upper groove. The outer wall of the pilot valve body is provided with an air guide groove and an exhaust groove that respectively connect to the through groove and the upper groove. The two ends of the inlet pipe connect to the air guide groove and the valve cover, respectively. The top cover is connected to the upper end of the pilot valve body and includes a top cover and a second spring compressed within the top cover. The lower end of the second spring protrudes from the top cover and abuts against the valve disc. Valve disc one, valve disc two includes a large column, a small column and a cap connected together. The upper end of the large column abuts against valve disc one and the lower end extends into the through groove. Valve disc two is provided with an exhaust channel extending from the outer wall of the upper end of the large column to the outer wall of the small column. An air intake channel is provided from the lower surface of the cap to the upper surface of the cap. The bottom cover is connected to the lower end of the guide valve body and extends into the lower groove. The cap is slidably disposed on the bottom cover and a third spring is clamped between the lower surface and the bottom cover. The two ends of the air intake pipe are respectively connected to the lower surface of the cap and the upstream of the flow channel.

[0011] When the second valve disc is in the upper position, the upper end of the air intake passage is closed by the guide valve body, and the upper end of the exhaust passage is connected to the exhaust groove.

[0012] Furthermore, the compression level of the second spring is adjustable.

[0013] Furthermore, an adjusting rod is threadedly connected to the upper end of the top cover, and the adjusting rod abuts against the upper end of the second spring.

[0014] Furthermore, a central axis channel extends through the middle of the bottom cover portion. The central axis channel includes an upper section channel and a lower section channel connected together. The diameter of the lower section channel is smaller than the diameter of the upper section channel. The third spring is installed inside the upper section channel, and the cap head is supported by the third spring.

[0015] Furthermore, the upper surface of the cap is spherical, and the lower end of the through groove is spherical corresponding to the upper surface of the cap.

[0016] Furthermore, the first spring, the second spring, and the third spring are all helical springs.

[0017] Furthermore, the valve cover flange is connected to the main valve body.

[0018] Furthermore, the pilot valve also includes a support rod that supports the pilot valve on the valve seat.

[0019] Furthermore, the lower end of the second spring is a spring seat, and the lower end of the spring seat extends through the top cover and abuts against the valve disc.

[0020] Furthermore, the top cover includes an upper top cover and a lower guide plate, the second spring is disposed between the top cover and the guide plate, and the lower end of the spring seat passes through the guide plate.

[0021] The parallel pilot-operated safety valve provided by this utility model integrates the advantages of parallel valves (low resistance flow and horizontal installation adaptability) with those of pilot-operated valves (high precision pressure control and rapid response) through an innovative design that integrates the parallel flow channel of the main valve with the pilot valve. It also adds new back pressure self-adaptation and zero-leakage sealing performance, making it suitable for scenarios with high requirements for pressure stability, flow efficiency and backflow prevention, such as liquefied petroleum gas stations, hydraulic systems, and chemical pipelines. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the first embodiment of the parallel pilot safety valve of this utility model;

[0023] Figure 2 This is a schematic diagram of the firing (pressure holding state) of the parallel pilot safety valve in the first embodiment of this utility model.

[0024] Figure 3 This is a schematic diagram of the pilot valve body in the first embodiment of the parallel pilot safety valve of this utility model;

[0025] Figure 4 This is a schematic diagram of valve disc two in the parallel pilot safety valve of the first embodiment of this utility model;

[0026] Figure 5 This is a schematic diagram of the first embodiment of the parallel pilot safety valve of this utility model (in the depressurization state).

[0027] Reference numerals: 100-Main valve body, 110-Flow channel, 111-Valve seat, 200-Guide sleeve, 210-Window, 300-Valve core, 400-First spring, 500-Valve cover, 600-Pilot valve, 610-Top cover, 611-Top cover, 612-Second spring, 613-Adjusting rod, 614-Spring seat, 615-Guide plate, 620-Pilot valve body, 621-Upper groove, 622- 623-Lower groove, 624-Air guide groove, 625-Exhaust groove, 630-Bottom cover, 631-Upper section channel, 632-Lower section channel, 640-Valve disc two, 641-Large column, 642-Small column, 643-Cap, 644-Exhaust passage, 645-Intake passage, 650-Outlet pipe, 660-Intake pipe, 670-Valve disc one, 680-Third spring, 700-Support rod. Detailed Implementation

[0028] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0029] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” “the,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, units, modules, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, units, modules, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connection or wireless coupling. The term “and / or” as used herein includes all or any units and all combinations of one or more associated listed items.

[0030] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0031] Reference Figures 1 to 5 In one embodiment of this utility model, a parallel pilot-operated safety valve includes:

[0032] The main valve body 100 has a flow channel 110 through which a valve seat 111 is provided in the middle;

[0033] A guide sleeve 200 is installed on the valve seat 111 and has a window 210 on it;

[0034] The valve core 300 slides on the guide sleeve 200 to close and release the window 210;

[0035] Valve cover 500 is connected to the main valve body 100 and closes the upper end of the guide sleeve 200;

[0036] A first spring 400 is disposed between the valve core 300 and the valve cover 500;

[0037] A pilot valve 600 includes a top cover 610, a pilot valve body 620, a bottom cover 630, a second valve disc 640, an outlet pipe 650, and an inlet pipe 660. The upper, middle, and lower ends of the pilot valve body 620 are respectively provided with a connected, cylindrical upper groove 621, a through groove 622, and a lower groove 623. A first valve disc 670 is slidably disposed within the upper groove 621. The outer wall of the pilot valve body 620 is provided with an air guide groove 624 and an exhaust groove 625, respectively connecting to the through groove 622 and the upper groove 621. The two ends of the inlet pipe 660 are respectively connected to the air guide groove 624 and the valve cover 500. The top cover 610 is connected to the upper end of the pilot valve body 620 and includes a top cover 611 and a second spring 612 compressed within the top cover 611. The lower end of the second spring 612 protrudes from the top cover 610 and abuts against... The valve disc 670 is held in place. The valve disc 640 includes a large column 641, a small column 642, and a cap 643 connected together. The upper end of the large column 641 abuts against the valve disc 670 and the lower end extends into the through groove 622. The valve disc 640 is provided with an exhaust passage 644 extending from the outer wall of the upper end of the large column 641 to the outer wall of the small column 642. An air intake passage 645 is provided from the lower surface of the cap 643 to the upper surface of the cap 643. The bottom cover 630 is connected to the lower end of the guide valve body 620 and extends into the lower groove 623. The cap 643 is slidably disposed on the bottom cover 630 and a third spring 680 is clamped between the lower surface and the bottom cover 630. The two ends of the air intake pipe 660 are respectively connected to the lower surface of the cap 643 and the upstream of the flow channel 110.

[0038] When the valve disc 640 is in the upper position, the upper end of the air intake duct 645 is closed by the pilot valve body 620, and the upper end of the exhaust duct 644 is connected to the exhaust groove 625.

[0039] In existing technologies, the solution of adding a pilot valve to a parallel reflux valve often adopts an external design where the pilot valve is perpendicular to the main valve flow channel. This results in a bend in the flow channel, increased pressure loss, and undermines the low resistance advantage of the parallel valve. Furthermore, it fails to solve the problem of synergy between pilot control and anti-backflow function, and suffers from structural redundancy and complex maintenance.

[0040] The parallel pilot safety valve provided by this utility model includes a main valve body 100, a guide sleeve 200, a valve core 300, a first spring 400, a valve cover 500, and a pilot valve 600.

[0041] The main valve body 100 has a flow channel 110 through which a valve seat 111 is located. The flow channel 110 can generally extend in a straight line or bend (for example, at a 90-degree angle in a vertical plane). The valve seat 111 can be integrally formed into the main valve body 100 or mounted on the main valve body 100.

[0042] The guide sleeve 200 is installed on the valve seat 111 and has a window 210 on it. A support structure can be provided on the guide sleeve 200 corresponding to the subsequent valve core 300, so that it can cooperate with the valve core 300.

[0043] The valve core 300 slides on the guide sleeve 200 to close and release the window 210. For example, the guide sleeve 200 has a step inside to support the valve core 300. When the valve core 300 is down, it is engaged with the step, and the guide sleeve 200 is closed. When the valve core 300 is up, it is separated from the step, and the window 210 is exposed, and the guide sleeve 200 is open.

[0044] The first spring 400 is located between the valve core 300 and the valve cover 500, and the valve core 300 is pressed down by the first spring 400.

[0045] The valve cover 500 is connected to the main valve body 100 and closes the upper end of the guide sleeve 200. The connection between the valve cover 500 and the main valve body 100 can be a flange or the like.

[0046] The pilot valve 600 includes a top cover 610, a pilot valve body 620, a bottom cover 630, a second valve disc 640, an outlet pipe 650, and an inlet pipe 660. The upper, middle, and lower ends of the pilot valve body 620 are respectively provided with a connected, cylindrical upper groove 621, a through groove 622, and a lower groove 623. A first valve disc 670 is slidably disposed within the upper groove 621. The outer wall of the pilot valve body 620 is provided with an air guide groove 624 and an exhaust groove 625, respectively connecting to the through groove 622 and the upper groove 621. The two ends of the inlet pipe 660 connect to the air guide groove 624 and the valve cover 500, thereby establishing communication between the air guide groove 624 and the interior of the guide sleeve 200. The top cover 610 is connected to the upper end of the pilot valve body 620 and includes a top cover 611 and a second spring 612 compressed within the top cover 611. The lower end of the second spring 612 protrudes from the top cover 610 and abuts against the first valve disc 670. The second valve disc 640 includes a connected large column 641, a small column 642, and a cap 643. The upper end of the large column 641 abuts against the first valve disc 670, while the lower end extends into the through groove 622. An exhaust passage 644 is provided inside the second valve disc 640, extending from the outer wall of the upper end of the large column 641 to the outer wall of the small column 642. An air intake passage 645 is provided from the lower surface of the cap 643 to the upper surface of the cap 643. The bottom cover 630 is connected to the lower end of the guide valve body 620 and extends into the lower groove 623. The cap 643 is slidably disposed on the bottom cover 630, and a third spring 680 is clamped between the lower surface and the bottom cover 630. The two ends of the air intake pipe 660 are respectively connected to the lower surface of the cap 643 and the upstream of the flow channel 110.

[0047] When valve disc 2 640 is in the upper position, the upper end of the intake passage 645 is closed by the guide valve body 620, and the upper end of the exhaust passage 644 is connected to the exhaust groove 625; when valve disc 2 640 is in the lower position, the upper end of the intake passage 645 is connected to the guide groove 624, and the upper end of the exhaust passage 644 is closed by the guide valve body 620.

[0048] During operation, when the upstream pressure of the flow channel 110 in the main valve body 100 is normal, the second spring 612 presses down the valve disc 670 and the valve disc 640 together. At this time, the upper end of the air intake channel 645 is connected to the air guide groove 624, and the upper end of the exhaust channel 644 of the valve disc 640 is closed by the guide valve body 620. The air pressure is normally conducted to the valve core 300 in the guide sleeve 200, and the gas above the valve core 300 will not be discharged from the exhaust groove 625.

[0049] When the pressure upstream of the flow channel 110 in the main valve body 100 is too high, valve disc 1 670 and valve disc 2 640 move upward together. At this time, the upper end of the air intake channel 645 on valve disc 2 640 is closed by the guide valve body 620, and the air intake channel 645 is no longer connected to the air guide groove 624. The upper end of the exhaust channel 644 of valve disc 2 640 is connected to the exhaust groove 625, and the gas above the valve core 300 is discharged from the exhaust groove 625. The valve core 300 moves upward, and the main valve body 100 completes the pressure relief.

[0050] In summary, through the innovative design of integrating the main valve parallel flow channel with the pilot valve, it combines the advantages of parallel valves (low resistance flow and horizontal installation adaptability) with pilot valves (high precision pressure control and rapid response). At the same time, it adds new back pressure self-adaptation and zero-leakage sealing performance, making it suitable for scenarios with high requirements for pressure stability, flow efficiency and backflow prevention, such as liquefied petroleum gas stations, hydraulic systems, and chemical pipelines.

[0051] In one embodiment, the compression level of the second spring 612 is adjustable.

[0052] In this embodiment, the working pressure of the parallel pilot safety valve can be adjusted by adjusting the compression degree of the second spring 612. The adjustment of the compression degree of the second spring 612 can be varied, for example, by setting an adjusting rod 613 threaded to the top cover 611.

[0053] Reference Figure 2 In one embodiment, the top cover 611 is threadedly connected to an adjusting rod 613, which abuts against the upper end of the second spring 612.

[0054] In this embodiment, the compression of the second spring 612 is adjusted by rotating the adjusting rod 613 inward and outward.

[0055] Reference Figure 2 In one embodiment, a central axis channel extends through the middle of the bottom cover portion 630. The central axis channel includes an upper section channel 631 and a lower section channel 632 connected together. The diameter of the lower section channel 632 is smaller than the diameter of the upper section channel 631. The third spring 680 is installed in the upper section channel 631, and the cap head 643 is supported by the third spring 680.

[0056] In this embodiment, the structure of the bottom cover 630 is specified, providing a basis for the installation of the third spring 680 and the sliding of the cap 643.

[0057] Reference Figure 4 In one embodiment, the upper surface of the cap 643 is spherical, and the lower end of the through groove 622 is spherical corresponding to the upper surface of the cap 643.

[0058] In this embodiment, the shape of the upper end of the cap 643 and the shape of the lower end of the through groove 622 are optimized, so that the cap 643 and the through groove 622 can form a better match and seal.

[0059] In one embodiment, the first spring 400, the second spring 612, and the third spring 680 are all helical springs.

[0060] In this embodiment, the first spring 400, the second spring 612, and the third spring 680 are all defined as helical springs, which have the advantages of stable elastic force and convenient installation.

[0061] In one embodiment, the valve cover 500 is flanged and connected to the main valve body 100.

[0062] In this embodiment, the valve cover 500 is fixed by a flange, which has the advantages of simplicity and convenience.

[0063] Reference Figure 1 In one embodiment, the pilot valve 600 further includes a support rod 700, which supports the pilot valve 600 on the valve seat 111.

[0064] In this embodiment, the pilot valve 600 is stably supported by the support rod 700.

[0065] Reference Figure 2 In one embodiment, the lower end of the second spring 612 is a spring seat 614, the lower end of which extends through the top cover portion 610 and abuts against the valve disc 670.

[0066] In this embodiment, the structure of the second spring 612 is decomposed into the second spring body and the spring seat 614 disposed at the lower end of the second spring body. The spring seat 614 interacts with the valve disc 670, making the operation of the valve disc 670 smoother.

[0067] Reference Figure 2 In one embodiment, the top cover 610 includes an upper top cover 611 and a lower guide disk 615, the second spring 612 is disposed between the top cover 611 and the guide disk 615, and the lower end of the spring seat 614 passes through the guide disk 615.

[0068] In this embodiment, the top cover 610 is structured such that the second spring 612 is protected by the space formed between the top cover 611 and the guide plate 615. The guide plate 615 can be fixed by clamping, and the top cover 611 and the valve body 620 can be fixed by a flange connection.

[0069] In summary, the parallel pilot-operated safety valve provided by this utility model integrates the advantages of parallel valves (low resistance flow and horizontal installation adaptability) and pilot valves (high precision pressure control and rapid response) through an innovative design that integrates the parallel flow channel of the main valve with the pilot valve. It also adds new back pressure self-adaptation and zero-leakage sealing performance, making it suitable for scenarios with high requirements for pressure stability, flow efficiency, and backflow prevention, such as liquefied petroleum gas stations, hydraulic systems, and chemical pipelines.

[0070] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A parallel pilot operated safety valve characterized by, It comprises: a main valve body, through which a flow channel with a valve seat in the middle is formed; a guide sleeve, which is installed on the valve seat and has a window on the top; a valve core, which slides in the guide sleeve to close and release the window; a valve cover, which is connected to the main valve body and closes the upper end of the guide sleeve; a first spring, which is arranged between the valve core and the valve cover; a pilot valve, which comprises a top cover, a pilot valve body, a bottom cover, a valve flap two, an air outlet pipe and an air inlet pipe, the upper end, the middle and the lower end of the pilot valve body are respectively provided with a cylindrical upper groove, a through groove and a lower groove which are connected, the valve flap one is slidably arranged in the upper groove, the outer wall of the pilot valve body is provided with an air guide groove and an exhaust groove which are respectively connected to the through groove and the upper groove, the two ends of the air inlet pipe are respectively connected to the air guide groove and the valve cover, the top cover is connected to the upper end of the pilot valve body and comprises a top cover and a second spring compressed in the top cover, the lower end of the second spring penetrates through the top cover and abuts against the valve flap one, the valve flap two comprises a large column, a small column and a cap head which are connected, the upper end of the large column abuts against the valve flap one and the lower end extends into the through groove, the exhaust passage is arranged in the valve flap two from the outer wall of the upper end of the large column to the outer wall of the small column, the air inlet passage is arranged on the lower surface of the cap head from the lower surface to the upper surface of the cap head, the bottom cover is connected to the lower end of the pilot valve body and extends into the lower groove, the cap head is slidably arranged in the bottom cover and the third spring is clamped between the lower surface of the cap head and the bottom cover, the two ends of the air inlet pipe are respectively connected to the lower surface of the cap head and the upstream of the flow channel. When the valve flap two is up, the upper end of the air inlet passage is closed by the pilot valve body and the upper end of the exhaust passage is connected to the exhaust groove.

2. The parallel pilot operated safety valve of claim 1, wherein The compression degree of the second spring can be adjusted.

3. The parallel pilot operated safety valve of claim 2, wherein, The upper end of the top cover is threadedly connected with an adjusting rod which abuts against the upper end of the second spring.

4. The parallel pilot operated safety valve of claim 1 wherein, The middle of the bottom cover is penetrated by a middle shaft passage which comprises an upper passage and a lower passage which are connected, the diameter of the lower passage is smaller than that of the upper passage, the third spring is installed in the upper passage and the cap head is supported by the third spring.

5. The parallel pilot operated safety valve of claim 1 wherein, The upper surface of the cap head is spherical and the lower end of the through groove corresponds to the spherical upper surface of the cap head.

6. The parallel pilot operated safety valve according to any one of claims 1 to 5, characterized in that The first spring, the second spring and the third spring are all spiral springs.

7. The parallel pilot operated safety valve according to any one of claims 1 to 5, characterized in that The valve cover is flange-connected to the main valve body.

8. The parallel pilot operated safety valve according to any one of claims 1 to 5, characterized in that The pilot valve further comprises a support rod which supports the pilot valve on the valve seat.

9. The parallel pilot operated safety valve according to any one of claims 1 to 5, characterized in that The lower end of the second spring is a spring seat which penetrates through the top cover and abuts against the valve flap one.

10. The parallel pilot operated safety valve of claim 9, wherein, The top cover and a guide disc are arranged on the top cover and the bottom cover respectively, the second spring is arranged between the top cover and the guide disc, and the lower end of the spring seat penetrates through the guide disc.

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