Pilot operated safety valve for urban gas

Abstract

The utility model relates to the technical field of safety valves, in particular to a pilot-operated safety valve for urban gas, and solves the problems that a pilot-operated safety valve in the prior art is single in connection mode at a connector, is mounted only through a flange, lacks further stabilizing components and is inconvenient to use. Therefore, the phenomenon of gas leakage occurs at the joint when the pilot operated safety valve is used for a long time, and certain potential safety hazards exist. A pilot operated safety valve for urban gas comprises a valve body, an inlet of the valve body is communicated with an inlet pipe, an inlet of the inlet pipe is communicated with a connecting sleeve, the outer side of the connecting sleeve is sleeved with a bearing ring, one side of the connecting sleeve is provided with an external pipe, and the outer side of the external pipe is sleeved with a fixing ring. According to the mode provided by the utility model, through the connection of the hook, the threaded rod and the threaded sleeve, the stability of the inlet of the valve body can be greatly improved, the using effect of the valve body is improved, the inlet of the valve body can be kept stable when the valve body is used, and the practicability is very high.

Description

TECHNICAL FIELD

[0001] The utility model relates to a safety valve technical field especially relates to a pilot operated safety valve for city gas. BACKGROUND

[0002] The pilot operated safety valve for city gas is an important safety control device, widely used in natural gas, city gas and other fields, to protect pressure vessels, equipment pipelines, avoid overpressure, and ensure normal production. The pilot operated safety valve is mainly composed of a main valve, a pilot valve (also known as a pilot valve or a secondary valve), a spring, a valve seat, a valve body and other components. The main valve and the pilot valve are connected through a pilot hole, and the size and number of the pilot hole determine the size of the pilot effect. The main valve usually adopts a piston type, with good sealing performance, high precision, rapid return to seat and no leakage. The pilot valve is composed of a valve body, a valve seat, a valve disc, a piston and a spring, responsible for controlling the opening and closing of the main valve. When the pressure of the protected equipment exceeds the set opening pressure of the safety valve, the pilot valve opens first, and the discharged medium enters the main valve from the bypass pipe, reducing the pressure in the gas chamber above the main valve disc. Because the medium pressure below the main valve disc is higher than that above, the main valve disc opens rapidly under the action of the pressure difference, releasing the overpressure medium. When the pressure drops to the set closing pressure, the pilot valve closes, and the main valve disc returns to the seat under the action of the spring, maintaining the normal working state of the system. High sensitivity: the pilot operated safety valve uses a pilot hole and a pilot valve to control the opening and closing of the main valve, with fast response speed and the ability to quickly release overpressure. Wide control pressure range: suitable for different pressure occasions, meeting the pressure protection needs of different equipment. Energy saving: compared with other types of safety valves, the pilot operated safety valve consumes less energy, helping to reduce system energy consumption. Good sealing performance: the sealing surface between the main valve disc and the valve seat is designed reasonably, maintaining good sealing performance and preventing medium leakage. Stable and reliable operation: the pilot operated safety valve has compact structure and reasonable design, maintaining stable performance in harsh working environments. The pilot operated safety valve for city gas is widely used in pressure control systems in natural gas, city gas and other industries. In gas pipelines, gas storage tanks, compressor discharge pipelines and other equipment, the pilot operated safety valve can effectively prevent equipment damage or explosion accidents caused by overpressure, ensuring production safety.

[0003] When using the pilot operated safety valve, it is necessary to ensure the safety of the pilot operated safety valve, especially the stability of the air inlet of the pilot operated safety valve. However, the traditional pilot operated safety valve interface connection method is single, only through flange installation, lacking further stable components, which may cause gas leakage at the interface of the pilot operated safety valve during long-term use, posing certain safety hazards, which is extremely inconvenient. Therefore, a pilot operated safety valve for city gas is needed to solve the above problems. SUMMARY

[0004] The utility model discloses a pilot safety valve for city gas, solve the pilot safety valve interface place connection mode single of prior art, just install through flange, lack further stable component, thereby can cause the phenomenon of gas leakage of pilot safety valve interface place when long -time use, have certain security hidden danger's problem.

[0005] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A pilot safety valve for city gas, including the valve body, the inlet pipe is connected to the inlet of the valve body, and the connecting sleeve is connected to the inlet of the inlet pipe, and the bearing ring is sleeved on the outside of the connecting sleeve, the external connection pipe is arranged on one side of the connecting sleeve, and the fixing ring is sleeved on the outside of the external connection pipe, a plurality of pull rods are arranged on one side of the bearing ring, hooks are rotatably connected to one end of the pull rods through the pin shafts, and the pull rods penetrate the bearing ring at one end, wherein the one end of the pull rod is elastically connected to one side of the bearing ring, a plurality of hanging grooves for cooperating with the hooks are formed on the fixing ring, a plurality of threaded sleeves are fixedly connected to one side of the bearing ring, a plurality of threaded rods are arranged on one side of the fixing ring, and the threaded rods penetrate the fixing ring at one end, wherein the threaded rods are threadedly connected to the inner wall of the threaded sleeves at the extension ends.

[0007] Preferably, a plurality of movable grooves are formed on the bearing ring, and the extension ends of all the threaded rods penetrate the bearing ring through the movable grooves.

[0008] Preferably, the side of the bearing ring close to all the threaded sleeves is fixedly connected to the fixed plate, the side of the fixed plate is provided with the screw rod, and the screw grooves for cooperating with the screw rod are formed on the fixed plate and the one end of the threaded rod.

[0009] Preferably, the extension ends of all the threaded rods penetrate the fixing ring through the screw grooves.

[0010] Preferably, the inner side of the connecting sleeve is provided with the annular groove, and the one end of the external connection pipe is located on the inner side of the annular groove.

[0011] Preferably, the extension ends of all the threaded rods penetrate the fixing ring through the screw grooves.

[0012] The utility model has the following beneficial effects:

[0013] The valve body is installed at a required position of the gas pipeline, then one end of the external connecting pipe is connected with the annular groove in the inner side of the connecting sleeve, then all the pull rods are pulled, the hooks can be clamped with the hanging grooves on the fixing ring, the hooks and the hanging grooves are flexibly clamped, the external connecting pipe is basically stabilized, then all the threaded rods are rotated, the threaded rods move through the fixing ring and move towards the threaded sleeve, and the threaded sleeve is screwed and connected, so that the external connecting pipe and the connecting sleeve are fixed, the connection mode of the interface of the pilot safety valve in the prior art is single, only the flange is installed, and there is no further stabilizing component, so that the pilot safety valve leaks gas at the interface after long time use, and there is a certain safety hazard, the mode in the utility model can greatly improve the stability of the valve body inlet, improve the use effect of the valve body, the valve body inlet can be kept stable during use, and has high practicability. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating labor.

[0015] Figure 1 It is the overall front view structural schematic diagram of the utility model;

[0016] Figure 2 It is the side view structural schematic diagram of the utility model;

[0017] Figure 3 It is the inlet pipe structural schematic diagram of the utility model;

[0018] Figure 4 It is the top view structural schematic diagram of the utility model;

[0019] Figure 5 It is the annular groove structural schematic diagram of the utility model;

[0020] Figure 6 It is the external connecting pipe structural schematic diagram of the utility model.

[0021] In the drawing: 1, valve body;2, inlet pipe;3, bearing ring;4, connecting sleeve;5, fixing ring;6, external connecting pipe;7, hook;8, tension spring;9, pull rod;10, threaded rod;11, fixed plate;12, screw;13, screw groove;14, movable groove;15, hanging groove;16, threaded sleeve;17, annular groove. DETAILED DESCRIPTION

[0022] In order to make the utility model purposes, technical scheme and advantages more clearly, the following will be further described in detail with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.

[0023] Referring to Figures 1-6 A kind of pilot operated safety valve for city gas, including valve body 1, the inlet of valve body 1 is communicated with inlet pipe 2, and the inlet of inlet pipe 2 is communicated with connecting sleeve 4, connecting sleeve 4 is connected with external pipe 6 using, and the outside of connecting sleeve 4 is sleeved with load ring 3, one side of connecting sleeve 4 is equipped with external pipe 6, and the outside of external pipe 6 is sleeved with fixed ring 5, one side of load ring 3 is equipped with several pull rods 9, using the elastic effect of pull rod 9, can make that hook 7 has certain elastic extrusion degree, and one end of pull rod 9 is rotatably connected with hook 7 by pin shaft, and one end of pull rod 9 penetrates load ring 3, wherein one end of pull rod 9 and one side of load ring 3 are elastically connected, several hook 7 are used to be set on fixed ring 5 respectively, and one side of load ring 3 is fixedly connected with several threaded sleeves 16, and one side of fixed ring 5 is equipped with several threaded rods 10, using threaded rod 10 and threaded sleeve 16 are threadedly connected, can be fixed to external pipe 6, and the end of all threaded rods 10 penetrates fixed ring 5, wherein the extension end of threaded rod 10 and the inner wall of threaded sleeve 16 are threadedly connected.

[0024] Further, several movable grooves 14 are formed on the load ring 3, and the extension end of all threaded rods 10 penetrates the load ring 3 through the movable grooves 14, and the extension end of the threaded rod 10 is supported by the movable grooves 14.

[0025] Further, the side of the load ring 3 close to all the threaded sleeves 16 is fixedly connected with a fixed plate 11, and the side of the fixed plate 11 is provided with a screw rod 12, and the fixed plate 11 and the end of the threaded rod 10 are provided with screw grooves 13 matched with the screw rod 12, the screw rod 12 and the screw grooves 13 are threadedly connected, the threaded rod 10 is limited, and the stability of the external pipe 6 is further improved.

[0026] Further, the end of all the pull rods 9 is sleeved with a tension spring 8, and the end of the pull rod 9 is elastically connected between the tension spring 8 and the side of the load ring 3, the tension spring 8 can make the pull rod 9 have a certain extrusion degree.

[0027] Further, the inner side of the connecting sleeve 4 is provided with an annular groove 17, and the end of the external pipe 6 is located inside the annular groove 17.

[0028] Further, the end of all the threaded rods 10 penetrates the fixed ring 5 through the threaded groove.

[0029] In summary:

[0030] The utility model discloses a kind of city gas pilot operated safety valves, first, valve body 1 is installed on the position required by gas pipeline, then the one end of external pipe 6 is butt joint with the annular groove 17 in the inside of connecting sleeve 4, then all pull rod 9 is pulled, so that hook 7 can be engaged with the hanging groove 15 on fixed ring 5, when hook 7 and pull rod 9 are pin shaft connection, hook 7 can be moved, to make hook 7 and hanging groove 15 between flexible hanging, realize the basic stability of external pipe 6, again all threaded rod 10 is rotated by manual mode, so that threaded rod 10 passes through fixed ring 5 and moves constantly towards threaded sleeve 16, and is screwed with threaded sleeve 16, to be fixed between external pipe 6 and connecting sleeve 4, the connection of hook 7 and threaded rod 10 and threaded sleeve 16 can greatly improve the stability of the inlet of valve body 1, improve the use effect of valve body 1, so that valve body 1 can keep stable at the inlet when using.

[0031] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model can have various changes and improvements, and these changes and improvements fall within the scope of the claimed utility model. The scope of protection required by the utility model is defined by the attached claims and their equivalents.

Claims

1. A pilot operated safety valve for city gas comprising a valve body (1), characterized in that, The inlet pipe (2) is communicated with the inlet of the valve body (1), and the inlet pipe (2) is communicated with the connecting sleeve (4) at the inlet, and the connecting sleeve (4) is sleeved with the bearing ring (3) on the outside, one side of the connecting sleeve (4) is provided with the external connecting pipe (6), and the external connecting pipe (6) is sleeved with the fixed ring (5) on the outside, one side of the bearing ring (3) is provided with a plurality of pull rods (9), one end of the pull rod (9) is rotatably connected with the hook (7) through the pin shaft, and one end of the pull rod (9) penetrates the bearing ring (3), wherein the one end of the pull rod (9) is elastically connected between the one side of the bearing ring (3), a plurality of hanging grooves (15) used in cooperation with the hooks (7) are formed in the fixed ring (5), a plurality of threaded sleeves (16) are fixedly connected to one side of the bearing ring (3), one side of the fixed ring (5) is provided with a plurality of threaded rods (10), and one end of all threaded rods (10) penetrates the fixed ring (5), wherein the extension end of the threaded rod (10) and the inner wall of the threaded sleeve (16) are connected by screwing.

2. The pilot-operated safety valve for city gas according to claim 1, characterized in that, A plurality of movable grooves (14) are formed in the bearing ring (3), and the extension end of all threaded rods (10) penetrates the bearing ring (3) through the movable groove (14).

3. The pilot-operated safety valve for city gas according to claim 2, wherein The bearing ring (3) is fixedly connected with the fixed plate (11) on the side close to all threaded sleeves (16), one side of the fixed plate (11) is provided with a screw rod (12), and screw grooves (13) used in cooperation with the screw rod (12) are formed in the fixed plate (11) and one end of the threaded rod (10).

4. The pilot-operated safety valve for city gas according to claim 1, wherein One end of all pull rods (9) is sleeved with a tension spring (8), and one end of the pull rod (9) is elastically connected between one side of the bearing ring (3) through the tension spring (8).

5. The pilot operated safety valve for city gas as claimed in claim 1, wherein The inner side of the connecting sleeve (4) is provided with an annular groove (17), and one end of the external connecting pipe (6) is located inside the annular groove (17).

6. The pilot operated safety valve for city gas according to claim 1, wherein One end of all threaded rods (10) penetrates the fixed ring (5) through the threaded groove.

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