A gas pressure reducing valve for nitrogen.

Abstract

This utility model relates to a gas pressure reducing valve for nitrogen. The valve body has gas inlet and outlet channels. A valve seat is located above the gas inlet channel, and a valve disc is located inside the valve seat. An adjusting rod corresponding to the valve seat is located inside the valve cover. A spring is engaged between the valve seat and the adjusting rod. The bottom of the upper valve seat has a cavity for placing the valve disc, and the top of the upper valve seat has a groove for engaging the adjusting rod. A spring retaining groove is located on the side of the upper valve seat to fix one end of the spring. An adjusting nut that can move up and down is located outside the adjusting rod to limit the height of the spring. A rotatable adjusting ring is located on the top of the valve cover, and the adjusting ring is fixed to the valve cover by a pan head screw. A pressure gauge is connected to the outside of the valve body. In use, the overall structure is highly integrated, simple, and compact, while ensuring stable outlet pressure. The spring height is controlled by the adjusting nut, ensuring the pressure reducing effect of the pressure reducing valve is precise, reliable, stable, and long-lasting.

Description

Technical Field

[0001] This utility model relates to the technical field of pressure reducing valves, specifically a gas pressure reducing valve for nitrogen. Background Technology

[0002] A gas pressure reducing valve is a specialized device that automatically reduces the working pressure of a pipeline. It can reduce the high gas pressure in the pipeline upstream of the valve to the level required by the pipeline downstream of the valve.

[0003] In the existing technology, gas pressure reducing valves are often complex in structure and require adjustment by double springs. As a result, they are often large in size and expensive. At the same time, they have poor pressure stability and the accuracy of the pressure value at the outlet cannot be guaranteed.

[0004] Therefore, there is an urgent need in the market for a gas pressure reducing valve that is compact in size and has strong pressure stability. Summary of the Invention

[0005] The purpose of this invention is to provide an improved gas pressure reducing valve for nitrogen. Through structural improvements, the pressure reducing valve is made smaller and the stability and accuracy of the pressure reduction process are improved.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: a gas pressure reducing valve for nitrogen, comprising a valve body and a valve cover connected to the valve body, characterized in that: the valve body is provided with gas inlet and outlet channels, a valve seat is provided above the gas inlet channel, a valve disc is provided inside the valve seat, an adjusting rod corresponding to the valve seat is provided inside the valve cover, and a spring is engaged between the valve seat and the adjusting rod; the valve seat includes an upper valve seat and a lower valve seat, the lower valve seat has a central hole corresponding to the gas inlet channel, and an upward protrusion is provided on the top of the lower valve seat, with the valve disc at the top of the protrusion; the bottom of the upper valve seat has a cavity for placing the valve disc, the top of the upper valve seat has a groove for cooperating with the adjusting rod, and a spring retaining groove is provided on the side of the upper valve seat to fix one end of the spring; an adjusting nut that can move up and down is provided outside the adjusting rod to limit the height of the spring; a rotatable adjusting ring is provided on the top of the valve cover, and the adjusting ring is fixed to the valve cover by a pan head screw; a pressure gauge is connected to the outside of the valve body.

[0007] Preferably, the valve body is provided with upper and lower valve seat grooves for placing the valve seat, the lower valve seat and the valve body are clearance fit with a clearance value of 0.8-3.2mm, and an O-ring is provided between the bottom of the valve seat and the valve body.

[0008] Furthermore, the upper valve seat groove is connected to the gas outlet flow channel via a gas connecting pipe.

[0009] Furthermore, the adjusting rod has an external thread, and the adjusting nut has an internal thread that mates with the external thread; the top of the adjusting rod has a limiting plate, and the limiting plate is connected to the adjusting rod by a connecting post, the diameter of which is smaller than the diameter of the adjusting rod.

[0010] Furthermore, a sealing ring is provided between the valve body and the valve cover, and the valve body and valve cover are fixed together by four hexagonal bolts, which are located at the four apex corners of the valve cover. The four apex corners of the valve body and valve cover are chamfered; an isolation cavity is provided at the top of the adjusting ring.

[0011] Compared with the prior art, the technical solution of this utility model not only improves the overall technical solution, but also includes many detailed improvements. Specifically, it has the following beneficial effects:

[0012] The improved solution described in this utility model has gas inlet and outlet channels in the valve body, a valve seat above the gas inlet channel, a valve disc inside the valve seat, an adjusting rod corresponding to the valve seat inside the valve cover, and a spring between the valve seat and the adjusting rod. The overall structure is highly integrated, simple and compact, and adopts a single spring structure, which is small in size and ensures stable outlet pressure.

[0013] In the technical solution of this utility model, the outside of the adjusting rod is provided with an adjusting nut that can move up and down to limit the height of the spring; the top of the valve cover is provided with a rotatable adjusting ring, which is fixed to the valve cover by a pan head screw. The height of the spring is controlled by adjusting the nut, which can ensure the pressure reducing effect of the pressure reducing valve, which is accurate, reliable, stable and long-lasting.

[0014] In the structure of this utility model, the valve seat includes an upper valve seat and a lower valve seat. The lower valve seat has a central hole at its center that corresponds to the gas inlet flow channel. The top of the lower valve seat has an upward protrusion, and the top of the protrusion has a valve disc. The above structure can help the valve disc to automatically adjust the opening more smoothly and accurately, so as to achieve the function of reducing pressure and stabilizing the gas medium.

[0015] This utility model has a simple structure, reasonable layout, is easy to use, and is convenient to promote and utilize. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is another structural schematic diagram of the present utility model.

[0018] Figure 3 This is a three-dimensional structural diagram of the present invention.

[0019] Figure label:

[0020] 1 Valve body, 2 O-ring seal, 3 Valve seat, 4 Valve disc, 5 Sealing ring, 6 Valve cover, 7 Spring, 8 Adjusting ring, 9 Gasket, 10 Pan head screw, 11 Adjusting rod, 12 Adjusting nut, 13 Hex bolt, 15 Pressure gauge. Detailed Implementation

[0021] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] This utility model provides a gas pressure reducing valve for nitrogen, including a valve body 1 and a valve cover 6 connected to the valve body, see details below. Figure 1 The difference between this and existing technologies is that: the valve body has gas inlet and outlet channels, a valve seat 3 is provided above the gas inlet channel, a valve disc 4 is provided inside the valve seat, an adjusting rod 11 corresponding to the valve seat is provided inside the valve cover, and a spring 7 is locked between the valve seat and the adjusting rod; the valve seat is a split structure, including an upper valve seat and a lower valve seat, the lower valve seat has a center hole corresponding to the gas inlet channel, the center hole is connected to the gas inlet channel, the top of the lower valve seat has an upward protrusion, and the top of the protrusion has a valve disc 4, which makes the correspondence between the center hole and the valve disc more precise and facilitates the automatic opening of the valve disc.

[0023] The bottom of the upper valve seat has a cavity for placing the valve disc, and the top of the upper valve seat has a groove for engaging with the adjusting rod. A spring retaining groove is provided on the side of the upper valve seat to fix one end of the spring. An adjusting nut 12 that can move up and down is provided on the outside of the adjusting rod to limit the height of the spring. Controlling the spring height by adjusting the nut ensures the pressure reducing effect of the pressure reducing valve is precise, reliable, stable, and long-lasting. The top of the valve cover has a rotatable adjusting ring 8, which is fixed to the valve cover by a pan head screw 10. A pressure gauge 15 is connected to the outside of the valve body. In use, this utility model has a high degree of integration, is simple and compact, has a small size, and ensures stable outlet pressure.

[0024] Example

[0025] This embodiment describes a gas pressure reducing valve for nitrogen, including a valve body and a valve cover connected to the valve body. The valve body contains a gas inlet channel and a gas outlet channel, with the gas inlet channel connected to a gas inlet and the gas outlet channel connected to a gas outlet. The gas inlet and outlet are symmetrically arranged along the valve body. A valve seat is provided above the gas inlet channel, and an automatically opening valve disc is provided inside the valve seat. An adjusting rod corresponding to the valve seat is provided inside the valve cover, and a spring is sleeved on the outside of the adjusting rod. An adjusting nut is provided on the adjusting rod, and the spring is positioned between the adjusting nut and the valve seat. The height of the spring is controlled by moving the adjusting nut up and down, thereby ensuring the pressure reducing effect of the pressure reducing valve.

[0026] Specifically, the valve seat includes an upper valve seat and a lower valve seat. The lower valve seat has a central hole corresponding to the gas inlet flow channel, and an upward protrusion on the top of the lower valve seat with a valve disc on the top of the protrusion. The bottom of the upper valve seat has a cavity for placing the valve disc, and the top of the upper valve seat has a groove for cooperating with the adjusting rod. The side of the upper valve seat has a spring retaining groove for fixing one end of the spring. The adjusting rod has an adjusting nut that can move up and down, and the adjusting nut has a downward protruding limiting step. The other end of the spring is set at the limiting step of the adjusting nut. The height of the spring is limited by the up and down movement of the adjusting nut. The top of the valve cover has a rotatable adjusting ring, which is fixed to the valve cover by a pan head screw. A pressure gauge is connected to the valve body.

[0027] Furthermore, the side wall of the valve cover near the gas inlet is a thin wall, and the side wall near the gas outlet is a thick wall. The thickness ratio between the thin wall and the thick wall is 1:2.5-4, with a preferred value of 1:3.2.

[0028] Furthermore, the valve body is provided with upper and lower valve seat grooves for placing the valve seat. The bottom of the lower valve seat groove is connected to the gas inlet flow channel. The lower valve seat and the valve body are clearance-fitted, with a clearance value of 0.8-3.2mm. An O-ring 2 is provided between the bottom of the valve seat and the valve body. The lower right side of the upper valve seat groove is connected to the gas outlet flow channel through a gas connecting pipe. Here, the connection angle between the gas connecting pipe and the gas outlet flow channel is 40-50 degrees.

[0029] Furthermore, the adjusting rod has external threads, and the adjusting nut has internal threads that mate with the external threads. A limiting plate is located at the top of the adjusting rod, and the limiting plate is connected to the adjusting rod via a connecting post with a diameter smaller than that of the adjusting rod. A sealing ring 5 is provided between the valve body and the valve cover, and the valve body and valve cover are fixed together by four hexagonal bolts 13, located at the four corners of the valve cover. Chamfers are provided at the four corners of the valve body and valve cover; an isolation cavity is provided at the top of the adjusting ring.

[0030] In summary, this utility model, through structural improvements and the adoption of a single-spring structure, makes the pressure reducing valve compact and improves the stability and accuracy of the pressure reduction process.

[0031] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications or substitutions should be considered within the protection scope of the present invention.

Claims

1. A gas pressure reducing valve for nitrogen, comprising a valve body and a valve cover connected to the valve body, characterized in that: The valve body has gas inlet and outlet channels. A valve seat is located above the gas inlet channel, and a valve disc is located inside the valve seat. An adjusting rod corresponding to the valve seat is located inside the valve cover. A spring is engaged between the valve seat and the adjusting rod. The valve seat includes an upper valve seat and a lower valve seat. The lower valve seat has a central hole corresponding to the gas inlet channel. The top of the lower valve seat has an upward protrusion, and the valve disc is located on the top of the protrusion. The bottom of the upper valve seat has a cavity for placing the valve disc. The top of the upper valve seat has a groove for engaging with the adjusting rod. The side of the upper valve seat has a spring retaining groove for fixing one end of the spring. The adjusting rod is equipped with an adjusting nut that can move up and down to limit the height of the spring; The valve cover is equipped with a rotatable adjusting ring on top, which is fixed to the valve cover by pan head screws; a pressure gauge is connected to the valve body.

2. A gas pressure reducing valve for nitrogen according to claim 1, characterized in that: The valve body is provided with upper and lower valve seat grooves for placing the valve seat. The lower valve seat and the valve body are clearance fit, with a clearance value of 0.8-3.2mm. An O-ring is provided between the bottom of the valve seat and the valve body.

3. A gas pressure reducing valve for nitrogen according to claim 2, characterized in that: The upper valve seat groove is connected to the gas outlet flow channel via a gas connecting pipe.

4. A gas pressure reducing valve for nitrogen according to claim 1, characterized in that: The adjusting rod has an external thread, and the adjusting nut has an internal thread that mates with the external thread. The top of the adjusting rod has a limiting plate, and the limiting plate is connected to the adjusting rod by a connecting post. The diameter of the connecting post is smaller than the diameter of the adjusting rod.

5. A gas pressure reducing valve for nitrogen according to claim 1, characterized in that: A sealing ring is provided between the valve body and the valve cover. The valve body and the valve cover are fixed together by four hexagonal bolts, which are located at the four corners of the top of the valve cover.

6. A gas pressure reducing valve for nitrogen according to claim 1, characterized in that: The valve body and valve cover have chamfered corners at their four apex; the top of the adjusting ring has an isolation cavity.

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