Multifunctional pilot-operated safety valve

Abstract

The invention discloses a multifunctional pilot safety valve, which relates to the technical field of valves. The invention designs the pilot valve and the main valve into an integrated structure, cancels the diaphragm structure in the existing pilot safety valve, and is provided with a main valve piston, the valve stem of the main valve is connected with the main valve piston, and is connected to the main valve. A damping hole is set on the piston. After the pilot valve completes the control of the main valve, the gas in the pilot valve can be output from the rear end of the main valve, and will not be discharged to the outside and will not affect the environment. The multi-purpose pilot-operated safety valve of the present invention has no external discharge medium when it takes off and discharges, and has the function of simultaneously satisfying the safe discharge of gas, liquid and high back pressure medium. The valve has the advantages of accurate take-off pressure, high discharge precision, sensitive action, reliable sealing, high pressure discharge, and long service life.

Description

technical field

[0001] The invention relates to the technical field of valves, in particular to the technical field of safety valves for transmission and distribution pipelines, and more particularly to a multifunctional pilot safety valve. Background technique

[0002] With the rapid development of my country's economy, various high-pressure gases are widely used in industry and civil applications, such as long-distance natural gas pipeline distribution and regional gas supply. The overpressure caused by various reasons causes the failure of the pipeline or container carrying the high-pressure gas, and the gas in the pipeline is suddenly released due to high compression to generate shock waves, causing devastating damage to nearby residents or buildings. In view of this, the control method for such events at home and abroad mostly adopts the method of limiting overpressure relief, that is, safe pressure relief.

[0003] The traditional safety valve is an ordinary spring ty...

Examples

Embodiment 1

[0032] As a preferred embodiment of the present invention, refer to the accompanying figure 1 , figure 2 and image 3 As shown, this embodiment discloses a multi-function pilot-operated safety valve, including a main valve part and a pilot valve part, and the main valve part and the pilot valve part are assembled into one; figure 1 As shown, it includes valve body 1, main valve sleeve 2, main valve core 3, valve stem 4, cylinder block 5, main valve piston 6, pilot valve seat 7, pilot valve disc 8, piston shaft 9, A medium inlet 12 and a medium outlet 13 are provided on the pressure guiding pipe 10 and the pilot valve adjusting assembly 11 and the valve body 1 .

[0033] like figure 2 As shown, the main valve sleeve 2 is assembled in the valve body 1 by the cylinder block 5, and the cylinder block 5 and the valve body 1 are fixedly assembled together; the main valve sleeve 2 is formed between the cylinder block 5 and the main valve sleeve 2 for assembling the main valve T...

Embodiment 2

[0039] As another preferred embodiment of the present invention, this embodiment is a specific implementation that is further perfected on the basis of Embodiment 1, and the details are as follows:

[0040] refer to image 3 As shown, as an implementation of the present embodiment, the passage through which the valve flap cavity 22 on the pilot valve seat 7 communicates with the piston upper cavity 17 is a damping passage. The damping passage on the pilot valve seat 7 further improves the opening sensitivity and precision of the main valve.

[0041] As another implementation of this embodiment, the end of the cylinder body 5 connected to the valve body 1 is provided with a channel hole II 26 , and the channel hole II 26 is connected to the cavity on the main valve sleeve 2 in the valve body 1 . Correspondingly, after the cylinder body 5 is assembled on the valve body 1 , the passage hole II 26 on the cylinder body 5 and the cavity on the main valve sleeve 2 form the spring ca...

Embodiment 3

[0043] As another preferred embodiment of the present invention, this embodiment is a specific implementation that is further perfected on the basis of Embodiment 1 and / or Embodiment 2, and the details are as follows:

[0044] As an implementation of this embodiment, the main valve core 3 includes an upper valve core 27 and a lower valve core 28, the lower valve core 28 is connected to the bottom of the upper valve core 27, and the upper valve core 27 is connected to the valve stem 4, And the upper valve core 27 is embedded in the main valve valve sleeve 2 and installed. The lower end of the main valve valve sleeve 2 is provided with a valve core cavity 29 for the upper valve core 27 to be nested. Window 30. The split structure of the upper spool 27 and the lower spool 28 is equivalent to setting a double seal. If there is a problem with the sealing pair at the bottom of the lower spool 28 and the main valve sleeve 2, the upper spool 27 can still be closed The purpose of the ...

technical field

[0001] The invention relates to the technical field of valves, in particular to the technical field of safety valves for transmission and distribution pipelines, and more particularly to a multifunctional pilot safety valve. Background technique

[0002] With the rapid development of my country's economy, various high-pressure gases are widely used in industry and civil applications, such as long-distance natural gas pipeline distribution and regional gas supply. The overpressure caused by various reasons causes the failure of the pipeline or container carrying the high-pressure gas, and the gas in the pipeline is suddenly released due to high compression to generate shock waves, causing devastating damage to nearby residents or buildings. In view of this, the control method for such events at home and abroad mostly adopts the method of limiting overpressure relief, that is, safe pressure relief.

[0003] The traditional safety valve is an ordinary spring ty...

Examples

Embodiment 1

[0032] As a preferred embodiment of the present invention, refer to the accompanying figure 1 , figure 2 and image 3 As shown, this embodiment discloses a multi-function pilot-operated safety valve, including a main valve part and a pilot valve part, and the main valve part and the pilot valve part are assembled into one; figure 1 As shown, it includes valve body 1, main valve sleeve 2, main valve core 3, valve stem 4, cylinder block 5, main valve piston 6, pilot valve seat 7, pilot valve disc 8, piston shaft 9, A medium inlet 12 and a medium outlet 13 are provided on the pressure guiding pipe 10 and the pilot valve adjusting assembly 11 and the valve body 1 .

[0033] like figure 2 As shown, the main valve sleeve 2 is assembled in the valve body 1 by the cylinder block 5, and the cylinder block 5 and the valve body 1 are fixedly assembled together; the main valve sleeve 2 is formed between the cylinder block 5 and the main valve sleeve 2 for assembling the main valve T...

Embodiment 2

[0039] As another preferred embodiment of the present invention, this embodiment is a specific implementation that is further perfected on the basis of Embodiment 1, and the details are as follows:

[0040] refer to image 3 As shown, as an implementation of the present embodiment, the passage through which the valve flap cavity 22 on the pilot valve seat 7 communicates with the piston upper cavity 17 is a damping passage. The damping passage on the pilot valve seat 7 further improves the opening sensitivity and precision of the main valve.

[0041] As another implementation of this embodiment, the end of the cylinder body 5 connected to the valve body 1 is provided with a channel hole II 26 , and the channel hole II 26 is connected to the cavity on the main valve sleeve 2 in the valve body 1 . Correspondingly, after the cylinder body 5 is assembled on the valve body 1 , the passage hole II 26 on the cylinder body 5 and the cavity on the main valve sleeve 2 form the spring ca...

Embodiment 3

[0043] As another preferred embodiment of the present invention, this embodiment is a specific implementation that is further perfected on the basis of Embodiment 1 and / or Embodiment 2, and the details are as follows:

[0044] As an implementation of this embodiment, the main valve core 3 includes an upper valve core 27 and a lower valve core 28, the lower valve core 28 is connected to the bottom of the upper valve core 27, and the upper valve core 27 is connected to the valve stem 4, And the upper valve core 27 is embedded in the main valve valve sleeve 2 and installed. The lower end of the main valve valve sleeve 2 is provided with a valve core cavity 29 for the upper valve core 27 to be nested. Window 30. The split structure of the upper spool 27 and the lower spool 28 is equivalent to setting a double seal. If there is a problem with the sealing pair at the bottom of the lower spool 28 and the main valve sleeve 2, the upper spool 27 can still be closed The purpose of the ...

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