A natural gas system safety valve

Abstract

The utility model relates to a natural gas system safety valve belongs to safety valve technical field, the safety valve includes the valve body, the bottom of valve body is the air inlet section, the side is the exhaust section, both intercommunication, the inside of valve body is provided with the sealing piston at the junction of air inlet section and exhaust section, the bottom of sealing piston seals the air inlet section, the upper cavity of valve body is screw thread connection with the support bolt in the top, the downside of support bolt is connected with the top surface of sealing piston through spring mechanism, the top of upper valve chamber is still screw thread connection with locking nut on the upside of support bolt. The safety valve designed in the utility model passes through setting up two layers of support structure of support bolt and locking nut, guarantees the position stability of adjusted sealing piston support end, will not displace in the long -term use process.

Description

Technical Field

[0001] This utility model relates to the field of safety valve technology, specifically to a safety valve for a natural gas system. Background Technology

[0002] Safety valves are essential protective valves in natural gas and other gas supply systems. They prevent overpressure in pipelines or containers, ensuring safety. When the gas pressure inside the supply system exceeds a specified value, the safety valve automatically opens to release pressure, and automatically closes when the internal pressure returns to normal. For example, patent CN204004636U discloses a spring-loaded natural gas safety valve, which, through the use of a spring, pilot rod, valve stem, and valve plate, automatically opens to release pressure when the pressure inside the natural gas pipeline exceeds the specified value. However, the safety valve disclosed in this patent uses a rigid connection between the valve plate and the pilot connecting rod. Although a safety protective cover is provided externally, in actual application, if a foreign object damages the protective cover and presses against the top of the pilot connecting rod, the automatic overpressure opening function of the safety valve will fail, and the valve plate will not open automatically. Moreover, the safety valve plate is directly inserted into the internal opening of the valve body's air inlet. When adjusting the valve plate during use, if the downward thrust is too great, there is a risk that the valve plate will be stuck in the internal opening of the air inlet. Once the valve plate is stuck in the internal opening, the automatic opening function of the valve plate will fail. Summary of the Invention

[0003] To address the problems in the existing technology, this utility model patent designs a natural gas system safety valve to solve the problem that the automatic opening function of existing natural gas safety valves fails due to external force or improper operation during application.

[0004] The technical solution adopted by this utility model is as follows: the safety valve includes a valve body, the bottom of the valve body is an air inlet section, the side is an exhaust section, and the two are connected. A sealing piston is provided inside the valve body at the junction of the air inlet section and the exhaust section. The bottom of the sealing piston seals the air inlet section. The sealing piston is slidably connected to the upper cavity of the valve body. A support bolt is threadedly connected to the top of the upper cavity of the valve body. The lower side of the support bolt is connected to the top surface of the sealing piston through a spring mechanism. An annular locking nut is also threadedly connected to the top of the upper valve cavity above the support bolt.

[0005] Furthermore, a protective cover is threaded onto the top outer side of the valve body, and an O-ring is provided between the inner side of the protective cover and the top end face of the valve body.

[0006] Furthermore, a sealing gasket is fixed to the bottom surface of the sealing piston, and a sealing guide sleeve is provided at the bottom section of the upper cavity of the valve body, and the sealing piston slides up and down along the sealing guide sleeve.

[0007] Furthermore, the air inlet section at the bottom of the valve body has a raised edge forming an internal air outlet, and the sealing piston is coaxially arranged with the air outlet, with the diameter of its bottom surface being larger than the diameter of the air outlet.

[0008] Furthermore, the spring mechanism includes a first support spring and a ejector pin. The bottom surface of the ejector pin is conical, and its cone apex is inserted into a circular hole at the center of the top surface of the sealing piston. The top surface of the ejector pin is a cylinder with a reduced diameter. The bottom end of the first support spring is sleeved and fixed on the cylinder on the top surface of the ejector pin, and the top end of the first support spring is sleeved on the bottom of the support bolt.

[0009] Furthermore, a second support spring is provided between the bottom surface of the protective cover and the locking nut.

[0010] Furthermore, a lead-sealed locking wire is provided between the protective cover and the valve body, and the exhaust section and the intake section of the valve body are also connected to the outside with a lead-sealed locking wire.

[0011] Compared to existing technologies, the advancement of this utility model patent design for a natural gas system safety valve lies in: The sealing piston and the support bolt of this utility model are connected by a spring mechanism. The spring mechanism consists of a first support spring and a push pin. It is a soft connection, which means that external operation of the support bolt will not necessarily cause the bottom sealing piston to be unable to open. The valve body of this utility model is provided with a two-layer support mechanism of support bolts and locking nuts at the top, which can ensure that the position of the adjusted support bolts will not be displaced even after long-term use, so as to achieve the accuracy of the safety valve for the pressure value to be protected. The diameter of the bottom surface of the sealing piston of this invention is larger than the diameter of the air outlet inside the air inlet section of the valve body to be sealed. It can directly cover and seal the surface of the air outlet, and can ensure good sealing effect even after long-term use, without leakage or inability to open. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a safety valve in a natural gas system.

[0013] In the diagram, 1 is the valve body, 2 is the intake section, 3 is the exhaust section, 4 is the sealing piston, 5 is the first support spring, 6 is the ejector pin, 7 is the support bolt, 8 is the locking nut, 9 is the protective cover, 10 is the O-ring seal, 11 is the lead seal, 12 is the locking wire, 41 is the sealing gasket, and 42 is the sealing guide sleeve. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described. The described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0015] like Figure 1 As shown, this utility model patent designs an embodiment of a safety valve for a natural gas system. In this embodiment, the safety valve includes a valve body 1. An inlet section 2 is assembled and fixed at the bottom of the valve body 1, and an exhaust section 3 is welded to the side. The inlet section 1 and the exhaust section 3 each have a through cavity along their axis, and the two are connected through the internal cavity of the valve body 1. A sealing piston 4 is provided inside the valve body 1 at the intersection of the inlet section 2 and the exhaust section 3. The bottom of the sealing piston 4 can seal the inlet section 2. The opening of the inlet section 1 inside the valve body 1 forms a convex edge that constitutes an internal air outlet. The sealing piston 4 is coaxially arranged with the air outlet, and its bottom diameter is larger than the diameter of the air outlet, which can directly cover and seal the air outlet.

[0016] The sealing piston 4 is slidably connected to the upper cavity of the valve body 1. A sealing gasket 41 is fixed on the bottom surface of the sealing piston 4. A sealing guide sleeve 42 is provided at the bottom section of the upper cavity of the valve body 1. The sealing piston 1 slides up and down along the sealing guide sleeve 42.

[0017] A threaded bushing is fixed to the top section of the upper cavity of valve body 1, and a support bolt 7 is threaded onto the bushing. An annular locking nut 8 is also threaded onto the upper side of the support bolt 7, with the center of the locking nut 8 protruding from the countersunk hole on the top surface of the support bolt 7. A protective cover 9 is threaded onto the outer top surface of valve body 1, and an O-ring seal 10 is provided between the inner surface of the protective cover 9 and the top end face of valve body 1. Additionally, a second support spring is provided between the bottom surface of the protective cover 9 and the locking nut 8.

[0018] The lower side of the support bolt 7 is connected to the top surface of the sealing piston 4 through a spring mechanism. The spring mechanism includes a first support spring 5 and a ejector pin 6. The bottom surface of the ejector pin 6 is conical, and its cone tip is inserted into the circular hole at the center of the top surface of the sealing piston 4. The top surface of the ejector pin 6 is a cylinder with a reduced diameter. The bottom end of the first support spring 5 is sleeved and fixed on the cylinder on the top surface of the ejector pin 6, and the top end of the first support spring 5 is sleeved on the bottom of the support bolt 7.

[0019] To prevent unauthorized personnel from operating the safety valve during use, locking wires 12 with lead seals 11 are installed between the protective cover 9 and the valve body 1, and between the air inlet section 2 and the exhaust section 3.

[0020] When the natural gas system safety valve disclosed in this utility model patent is applied, firstly, the support bolt 7 is tightened, and the first support spring 5 and the pin 6 generate a downward pushing force on the sealing piston 4, sealing the internal outlet of the inlet section 2 of the valve body 1. The position of the support bolt 7 is determined according to the pressure value to be protected. After adjustment, the locking nut 8 is tightened, and then the protective cover 9 is tightened, and the locking wire 12 is connected. After the safety valve is installed, when the internal pressure of the natural gas system exceeds the specified value, it will push the sealing piston 4 upward, opening the internal outlet of the inlet section 2. Natural gas is discharged through the exhaust section 3 to the recovery device, depressurizing the natural gas system. When the internal pressure of the natural gas system returns to normal after depressurization, the sealing piston 4 re-seals the internal outlet of the inlet section 2 under the elastic force of the first support spring 5, preventing natural gas leakage.

[0021] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. Any simple equivalent changes and modifications made in accordance with the claims and description of the present invention shall still fall within the scope of the present invention.

Claims

1. A safety valve for a natural gas system, the safety valve comprising a valve body, wherein the bottom of the valve body is an inlet section and the side is an exhaust section, the two being connected, characterized in that, A sealing piston is provided inside the valve body at the junction of the intake section and the exhaust section. The bottom of the sealing piston seals the intake section. The sealing piston is slidably connected to the upper cavity of the valve body. A support bolt is threadedly connected to the top of the upper cavity of the valve body. The lower side of the support bolt is connected to the top surface of the sealing piston through a spring mechanism. An annular locking nut is also threadedly connected to the top of the upper cavity above the support bolt.

2. A safety valve for a natural gas system according to claim 1, characterized in that, A protective cover is threaded to the top outer side of the valve body, and an O-ring is provided between the inner side of the protective cover and the top end face of the valve body.

3. A safety valve for a natural gas system according to claim 2, characterized in that, A sealing gasket is fixed to the bottom surface of the sealing piston, and a sealing guide sleeve is provided at the bottom section of the upper cavity of the valve body. The sealing piston slides up and down along the sealing guide sleeve.

4. A safety valve for a natural gas system according to claim 3, characterized in that, The bottom air inlet section of the valve body has an opening inside the valve body that forms a convex edge to constitute an internal air outlet. The sealing piston is coaxially arranged with the air outlet, and the diameter of its bottom surface is larger than the diameter of the air outlet.

5. A safety valve for a natural gas system according to claim 4, characterized in that, The spring mechanism includes a first support spring and a ejector pin. The bottom surface of the ejector pin is conical, and its cone apex is inserted into a circular hole at the center of the top surface of the sealing piston. The top surface of the ejector pin is a cylinder with a reduced diameter. The bottom end of the first support spring is sleeved on the cylinder on the top surface of the ejector pin, and the top end of the first support spring is sleeved on the bottom of the support bolt.

6. A safety valve for a natural gas system according to claim 5, characterized in that, A second support spring is provided between the bottom surface of the protective cover and the locking nut.

7. A safety valve for a natural gas system according to claim 6, characterized in that, A lead-sealed locking wire is installed between the protective cover and the valve body, and a lead-sealed locking wire is also connected to the outside of the exhaust section and the intake section of the valve body.

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