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Pilot type pipe burst shutoff valve and method for controlling same

A pilot-operated, shut-off valve technology, applied in the field of shut-off valves, can solve the problems of low serialization, low adjustment precision, high manufacturing cost, and achieve the effect of high degree of automation

Active Publication Date: 2018-07-27
CHINA YANGTZE POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are: 1. To adjust the pressure setting value, it is necessary to adjust several spring compression bolts at the same time, and the adjustment accuracy is low; 2. For different nominal diameters and different pressure setting values ​​of squib shut-off valves, it is necessary to choose a variety of different specifications. springs, the degree of product serialization is low, and the manufacturing cost is high

Method used

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  • Pilot type pipe burst shutoff valve and method for controlling same
  • Pilot type pipe burst shutoff valve and method for controlling same
  • Pilot type pipe burst shutoff valve and method for controlling same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] like figure 1 As shown, the pilot-operated squib shut-off valve includes a main valve, and the main valve is connected to the pilot valve through a connecting pipeline; the pilot valve includes a pilot valve body 21, and the bottom of the pilot valve body 21 is equipped with a pilot valve The end cover 22, the pilot valve body 21 and the pilot valve end cover 22 form a closed chamber, the pilot valve spring 25 and the pilot valve spool 26 are installed inside the closed chamber, and the top of the pilot valve body 21 is installed with An adjustment bolt 23 , the bottom end surface of the adjustment bolt 23 is in contact with the top end of the pilot valve spring 25 ; the preload of the pilot valve spring 25 can be adjusted through the adjustment bolt 23 .

[0042] Further, the bottom side of the pilot valve body 21 is processed with a first pilot valve opening 31, and the first pilot valve opening 31 communicates with the outlet side opening 37 of the main valve; the pi...

Embodiment 2

[0051] like figure 2 , in this embodiment, the structure of the main valve is the same as in Embodiment 1, and the center hole structure of the pilot valve in this embodiment is different from that in Embodiment 1. In this embodiment, its center hole is located at the pilot valve The central position of the valve core 26, and the central hole communicates with the annular gap formed by the first sealing ring 27 and the second sealing ring 28 through a transverse through hole communicating with it.

Embodiment 3

[0053] like image 3 , in this embodiment, the structure of the main valve is the same as in Embodiment 1. In this embodiment, the return spring 16 is installed outside the cylinder body 13, and then exerts elastic force on the moving parts of the main valve.

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Abstract

The invention discloses a pilot type pipe burst shutoff valve and a method for controlling the same. The pilot type pipe burst shutoff valve is characterized in that a main valve is connected with a pilot valve by a connecting pipeline; the pilot valve comprises a pilot valve body, a pilot valve end cover is mounted at the bottom of the pilot valve body, a closed chamber is formed by the pilot valve body and the pilot valve end cover, a pilot valve spring and a pilot valve element are mounted inside the closed chamber, an adjusting bolt is mounted on the top of the pilot valve body, and the bottom surface of the adjusting bolt is matched with the top of the pilot valve spring in a contact manner; a first pilot valve opening is formed in a side surface of the bottom of the pilot valve bodyby means of machining and is communicated with an opening in a water outlet side of the main valve; a pilot valve bottom opening is formed in the center of the pilot valve end cover by means of machining and is communicated with a main valve opening of the main valve; a second pilot valve opening and a third pilot valve opening which are communicated with the atmosphere are further formed in a side wall of the pilot valve body. The pilot type pipe burst shutoff valve and the method have the advantages that the pilot type pipe burst shutoff valve can adapt to normal change of internal pressuresof pipelines, and action pressures of the pilot type pipe burst shutoff valve can be freely adjusted.

Description

technical field [0001] The invention relates to a shut-off valve, in particular to a pilot-operated squib shut-off valve and a control method. Background technique [0002] The large amount of fluid leakage caused by the explosion of the pressurized pipeline will cause great losses to the production and life of people along the line. The pilot-operated squib shut-off valve that relies on its own control can quickly move to full close, minimize the consequences of pipeline leakage accidents, reduce secondary losses, and improve the safety and economy of the pipeline network. [0003] The pipe burst shut-off valve is a device that can quickly detect and cut off the fluid delivery when the pressurized pipe bursts. It is suitable for various water supply pipes such as urban water supply projects and industrial water supply projects. The pipe burst shut-off valve controlled by the pilot valve does not need electrical control, but only relies on the pressure of the pilot valve on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K17/06F16K17/10
CPCF16K17/0413F16K17/06F16K17/10
Inventor 李鹏孔令臣朱旭东
Owner CHINA YANGTZE POWER
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