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Pilot safety valve

A pilot safety valve, pilot valve seat technology, used in safety valves, valve devices, balance valves, etc., can solve the problems of poor sealing, high maintenance rate and high failure rate of pilot safety valves, and achieve excellent service life. , to avoid potential safety hazards, the effect of excellent sealing performance

Inactive Publication Date: 2020-11-24
四川长仪油气集输设备股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the defects and deficiencies in the above-mentioned prior art, the present invention provides a pilot-operated safety valve. The purpose of the invention is to solve the problems of high maintenance rate, high failure rate, and poor sealing of the current pilot-operated safety valve.

Method used

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Embodiment Construction

[0032] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0033] Refer to the attached figure 1 The pilot safety valve involved in the present invention includes a pilot valve 1 and a main valve 21. The pilot valve 1 is a pilot safety valve control mechanism, and its performance and reliability directly determine the accuracy and service life of the pilot safety valve. One end of the pilot valve 1 is connected to the inlet end of the main valve 21 by an air inlet pipe 23 , and the other end is connected to the upper chamber 16 of the main valve by an air induction pipe 24 . When the pressure of the protected pipeline reaches the setting value of the pilot valve spring 12 of the safety valve, the spring is compressed, and the disc 3 of the pilot valve opens. Air hole area, main valve upper cavity 16 releases pressure, main valve disc 3 is pushed by the inlet pressure, opens quickly, main va...

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Abstract

The invention discloses a pilot safety valve, and relates to the technical field of safety protection equipment for natural gas collection and transmission pipelines. The pilot safety valve disclosedby invention includes a pilot valve and a main valve; the pilot valve includes a pilot valve seat, a pilot valve clack, a pilot valve stem, a lower valve body, an upper valve body and a pilot valve cover; the main valve includes a main valve body, a main valve seat, a main valve core, a main valve sleeve and a main valve cover; a valve seat sealing O-ring is arranged on the end surface of the pilot valve seat; an annular dovetail groove is opened on the end surface of the pilot valve seat; the valve seat sealing O-ring is fixed in the annular dovetail groove; a boss is arranged on the valve clack of the pilot valve; and when closing, the boss at the bottom of the pilot valve clack enters the annular dovetail groove and axially compresses the valve seat sealing O-ring to deform, and the pilot valve closes. The pilot safety valve disclosed by the invention has good sealing performance and low failure rate, can increase the set pressure value of the pilot safety valve to 32 MPa, and has the characteristics of high-precision discharge, small return pressure, and obvious bursting effect.

Description

technical field [0001] The invention relates to the technical field of safety protection equipment for natural gas collection and transmission pipelines, in particular to a pilot safety valve. Background technique [0002] The pilot-operated safety valve is the main safety protection equipment for natural gas collection and transmission pipelines. Its function is to automatically open and release the overpressured gas in the pipeline when the pipeline pressure abnormally reaches the set value of the safety valve, so as to avoid pipeline burst caused by continuous rise in pipeline pressure, etc. security incident. [0003] At present, there are generally two types of sealing methods for the pilot valve disc of pilot-operated safety valves used on site, O-ring radial seal and valve disc vulcanized rubber end face seal. According to long-term use on site, these two sealing methods There are defects, which lead to reduced valve reliability and increased maintenance rates. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K17/10F16K17/164
CPCF16K17/10F16K17/164
Inventor 王元清张月伟魏连康黄世强
Owner 四川长仪油气集输设备股份有限公司
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