阅读说明：本技术 一种天然气仪表用压差截断阀 (Differential pressure cut-off valve for natural gas instrument ) 是由 朱国财 朱培斌 朱培贤 谢卫红 朱培兴 于 2020-07-24 设计创作，主要内容包括：本发明涉及阀门技术领域,具体涉及一种天然气仪表用压差截断阀,它包括阀体、安装于阀体顶部的阀盖,阀体的两侧分别为介质入口侧、介质出口侧,阀体内位于介质入口侧的内部设有压差截断装置,压差截断装置包括弹簧、阀塞、调整套,调整套固定在阀体内部,阀塞入口端面与调整套右端面相连,阀塞入口端面开设有槽,以构成入口处的泄压流道,阀塞中部外圆处为锥面设计,且锥面体与阀体对应入口处,阀塞与阀体构成第一密封副,阀塞与阀体配合面之间间隙较大,构成了第一密封副的出口泄压流道,阀塞右移与阀体接触后,封闭截断阀泄压流道,实现截断阀密封,弹簧安装在阀塞右端面,且通过弹性系数的设计与阀塞根据压差大小实现开启与关闭的自动平衡。(The invention relates to the technical field of valves, in particular to a differential pressure cut-off valve for a natural gas instrument, which comprises a valve body and a valve cover arranged at the top of the valve body, wherein the two sides of the valve body are respectively a medium inlet side and a medium outlet side, a differential pressure cut-off device is arranged inside the valve body and positioned at the medium inlet side, the differential pressure cut-off device comprises a spring, a valve plug and an adjusting sleeve, the adjusting sleeve is fixed inside the valve body, the inlet end surface of the valve plug is connected with the right end surface of the adjusting sleeve, the inlet end surface of the valve plug is provided with a groove to form a pressure relief flow passage at the inlet, the outer circle of the middle part of the valve plug is designed into a conical surface, the conical surface corresponds to the valve body, the valve plug and the valve body form a first sealing pair, the gap between the valve plug and the matching surface of the valve body is larger, after the outlet, and the automatic balance of opening and closing is realized through the design of the elastic coefficient and the valve plug according to the pressure difference.)

1. The utility model provides a natural gas is pressure differential block valve for instrument, includes valve body (1), installs in valve gap (2) at valve body (1) top, its characterized in that: the two sides of the valve body (1) are respectively a medium inlet side (9) and a medium outlet side (18), a pressure difference cut-off device is arranged in the valve body (1) and positioned on the medium inlet side (9), the pressure difference cut-off device comprises a spring (10), a valve plug (11) and an adjusting sleeve (12), the adjusting sleeve (12) is fixed in the valve body (1), the inlet end face of the valve plug (11) is connected with the right end face of the adjusting sleeve (12), a groove (15) is formed in the inlet end face of the valve plug (11) to form a pressure relief flow channel at an inlet, the outer circle in the middle of the valve plug (11) is designed as a conical surface, the conical surface and the inlet corresponding to the valve body (1) are formed, the valve plug (11) and the valve body (1) form a first sealing pair (13), the gap between the valve plug (11) and the matching surface of the valve body (1) is larger, valve plug (11) move to the right and contact back with valve body (1), seal and cut off valve pressure release runner, realize that the cut-off valve is sealed, install in valve plug (11) right-hand member face spring (10), just spring (10) realize opening and the automatic balance of closing according to pressure difference size through the design of elastic coefficient and valve plug (11).

2. The differential pressure shut-off valve for the natural gas instrument according to claim 1, characterized in that: an inlet flow channel (16) communicated with the medium inlet side (9) is arranged at the right upper end of the medium inlet side (9), a valve core (8) is arranged at one end, away from the medium inlet side (9), of the inlet flow channel (16), the valve core (8) is installed between the valve body (1) and the valve cover (2), the valve core (8) and the valve body (1) form a second sealing pair (17), an outlet flow channel (14) is arranged at the right lower end of the valve core (8), the outlet flow channel (14) is communicated with the medium outlet side (18), the inlet flow channel (16) and the outlet flow channel (14) are both obliquely arranged, the inlet flow channel (16), the outlet flow channel (14) and the first sealing pair (13) form a working flow channel, and the first sealing pair (13) is opened and closed through the up-down lifting of the.

3. The differential pressure shut-off valve for the natural gas instrument as claimed in claim 2, wherein: the valve is characterized in that a valve rod (5) is fixedly connected to the top of the valve core (8), a filler (3) is arranged between the outer side of the valve rod (5) and the valve cover (2), and a horizontal groove (15) 0 for compressing the filler (3) is formed in the top of the filler (3).

4. The differential pressure shut-off valve for the natural gas instrument according to claim 3, characterized in that: the top fixedly connected with handle (7) of valve rod (5), the inboard of handle (7) is equipped with spliced pole (6) that run through valve rod (5) top and handle (7).

5. The differential pressure shut-off valve for the natural gas instrument according to claim 4, characterized in that: the left end face of the medium outlet side (18) is communicated with the differential pressure cut-off device.

Technical Field

The invention relates to the technical field of valves, in particular to a differential pressure block valve for a natural gas instrument.

Background

Natural gas is used as a clean and efficient fossil energy, the development and utilization of the natural gas are more and more emphasized by various countries in the world, the natural gas is widely applied to industrial and civil heating, power generation, incineration, drying and other systems, the requirement on the tightness of the system in the using process is high, once leakage occurs, serious safety accidents such as combustion and explosion can be caused, the personal safety and the equipment safety are endangered, and therefore the natural gas leakage needs to be strictly prevented.

Disclosure of Invention

In view of the above situation, in order to overcome the defects of the prior art, the invention aims to provide a differential pressure block valve for a natural gas instrument, which is mainly used in occasions where leakage is easy to occur, such as a natural gas station, and the like, has an instrument leakage self-closing function, can reduce leakage hidden danger, and improves the system safety level.

The technical purpose of the invention is realized by the following technical scheme:

a differential pressure cut-off valve for a natural gas instrument comprises a valve body and a valve cover arranged at the top of the valve body, wherein the two sides of the valve body are respectively a medium inlet side and a medium outlet side, a differential pressure cut-off device is arranged in the valve body and positioned on the medium inlet side, the differential pressure cut-off device comprises a spring, a valve plug and an adjusting sleeve, the adjusting sleeve is fixed in the valve body, the inlet end face of the valve plug is connected with the right end face of the adjusting sleeve, the inlet end face of the valve plug is provided with a groove to form a pressure relief flow channel at the inlet, the excircle in the middle of the valve plug is designed into a conical surface, the conical surface corresponds to the inlet of the valve body, the valve plug and the valve body form a first sealing pair, a gap between the valve plug and the matching surface of the valve body is large, the outlet pressure relief flow channel of the first sealing pair, the spring is installed at the valve plug right-hand member face, just the spring passes through the design of elastic coefficient and the automatic balance that the valve plug opened and closed according to pressure differential size realization.

Furthermore, an inlet flow channel communicated with the right upper end of the medium inlet side is arranged at the right upper end of the medium inlet side, a valve core is arranged at one end, away from the medium inlet side, of the inlet flow channel, the valve core is installed between the valve body and the valve cover, the valve core and the valve body form a second sealing pair, an outlet flow channel is arranged at the right lower end of the valve core, the outlet flow channel is communicated with the medium outlet side, the inlet flow channel and the outlet flow channel are both obliquely arranged, the inlet flow channel, the outlet flow channel and the first sealing pair form a working flow channel, and the first sealing pair is opened and closed through the vertical lifting.

Furthermore, the top of the valve core is fixedly connected with a valve rod, a packing is arranged between the outer side of the valve rod and the valve cover, and a packing gland for compressing the packing is arranged at the top of the packing.

Further, the top fixedly connected with handle of valve rod, the inboard of handle is equipped with the spliced pole that runs through valve rod top and handle.

Further, the medium outlet side left end face is communicated with the differential pressure cutoff device.

In conclusion, the invention has the following beneficial effects: the whole differential pressure block valve is mainly used for occasions where leakage easily occurs, such as a natural gas station and the like, has an instrument leakage self-closing function, can reduce leakage hidden danger, improves the system safety level, ensures the safety of users, greatly improves the safety factor, has excellent sealing performance, and can directly observe the condition of the valve by being connected with a display instrument.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, and are not to be considered limiting of the invention, in which:

fig. 1 is a schematic view of the overall structure of the present invention.

In the figure, 1, a valve body; 2. a valve cover; 3. a filler; 4. a packing gland; 5. a valve stem; 6. connecting columns; 7. a handle; 8. a valve core; 9. a media inlet side; 10. a spring; 11. a valve plug; 12. an adjusting sleeve; 13. a first sealing pair; 14. an outlet flow passage; 15. a groove; 16. an inlet flow passage; 17. a second sealing pair; 18. a media outlet side.

Detailed Description

The foregoing and other technical and scientific aspects, features and utilities of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings of fig. 1. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.

Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.