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Pilot valve for pilot type safety valve and pilot type safety valve

A technology of pilot-operated safety valves and pilot-operated valves, which is applied to safety valves, valve operation/release devices, valve details, etc., can solve the problems of decreased sensitivity and precision, reduced valve performance, and high pressure-sensing precision, so as to improve control and Driving ability, improving forward sealing and reverse sealing ability, ensuring the effect of normal operation

Active Publication Date: 2021-01-22
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pilot valve is a pressure-sensitive control valve. The valve is small in size and high in pressure-sensing precision. After using a preload spring with a high stiffness, the sensitivity and accuracy of the pilot valve will decrease, thereby reducing the performance of the entire valve.

Method used

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  • Pilot valve for pilot type safety valve and pilot type safety valve
  • Pilot valve for pilot type safety valve and pilot type safety valve
  • Pilot valve for pilot type safety valve and pilot type safety valve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A pilot valve for a pilot-operated safety valve, including a drive valve 39, a balance valve 55 and an auxiliary valve 56, the pilot valve outlet 17 is arranged on the balance valve 55; the drive valve seat 10 of the drive valve 39 has a flow path The area is less than or equal to the flow path area of ​​the balance valve seat 19 of the balance valve 55; the auxiliary valve inlet 1 of the auxiliary valve 56 is used to connect the main valve inlet 36 of the main valve 37 of the pilot safety valve, and the outlet of the auxiliary valve 56 It is connected to the inlet of the balance valve 55; the balance disc 18 of the balance valve 55 is pressed against the balance valve seat 19 by the secondary side pressure passing through the outlet 17 of the pilot valve in state 1, and the balance valve 55 is driven by medium pressure in state 2 The balance valve rod 16 pushes back the driving disc 14 of the driving valve 39 .

[0039] Wherein, the balance valve 55 is divided into a b...

Embodiment 2

[0053] Based on Embodiment 1, the difference is that the auxiliary valve 56 is divided into an auxiliary valve chamber 6 and an auxiliary valve discharge chamber 8 by the auxiliary valve seat 3; Tighten the spring 40, the auxiliary valve discharge chamber 8 is connected to the outlet of the drive valve 39; the balance valve 55 includes a pressure sensing chamber 47, and the pressure sensing chamber 47 is provided with a pressure sensing bellows 46; the pressure sensing chamber 47 is provided with a pressure-sensing chamber inlet 48, and the pressure-sensing chamber inlet 48 is used to connect the main valve inlet 36 of the main valve 37 of the pilot safety valve; the auxiliary valve 56 is provided with an auxiliary valve opening push rod 42, and the One end of the auxiliary valve opening ejector rod 42 is connected with the pressure-sensitive bellows 46 to drive the auxiliary valve opening ejector rod 42 to push the auxiliary valve disc 4 through the contraction of the pressure...

Embodiment 3

[0060] Based on Embodiment 1, the difference is that it also includes a secondary drive valve 60; the secondary drive valve 60 is divided into a secondary drive valve piston upper cavity 52 and a secondary drive valve piston lower cavity 57 by a secondary drive valve piston 51 The secondary drive valve piston 51 is provided with a secondary drive valve back pressure hole 54; the secondary drive valve piston upper cavity 52 is provided with a secondary drive valve reset preload spring 53, and the secondary drive valve piston lower The chamber 57 is divided into an inlet and an outlet of the secondary driving valve 60; the inlet of the driving valve 39 communicates with the piston upper chamber 52 of the secondary driving valve

[0061] Such as Figure 4 As shown, it can be understood that the driving valve function module of the pilot valve is a two-stage driving valve module, through the flow amplification effect of the secondary driving valve 60 on the driving valve 39, the d...

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Abstract

The invention relates to the technical field of valves, in particular to a pilot valve for a pilot type safety valve. According to the technical scheme, the pilot valve for the pilot type safety valvecomprises a driving valve, a balance valve and an auxiliary valve; an outlet of the pilot valve is formed in the balance valve; the area of a driving valve seat flow channel of the driving valve is smaller than or equal to that of a balance valve seat flow channel of the balance valve; an auxiliary valve inlet of the auxiliary valve is connected with a main valve inlet of a pilot type safety valve main valve; and an outlet of the auxiliary valve is connected with a balance valve inlet. In the first state, the balance valve clack of the balance valve abuts against the balance valve seat through the secondary side pressure of the outlet of the pilot valve, and in the second state, a balance valve rod of the balance valve is driven by the medium pressure to eject the driving valve clack of the driving valve open. According to the pilot valve for the pilot type safety valve and the pilot type safety valve, the pilot valve can be prevented from being opened mistakenly due to abnormal riseof back pressure, abnormal opening of the main valve is further avoided, and normal operation of a system is guaranteed.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a pilot valve used for a pilot safety valve and a pilot safety valve. Background technique [0002] The pilot-operated safety valve is composed of a main valve and a pilot valve. The main valve is controlled by the pilot valve to perform the discharge and pressure relief function. If the pilot valve is opened by mistake, it will cause the main valve to open abnormally and release pressure, which will affect the normal operation of the system. In order to improve the positive sealing ability, the disc of the pilot safety valve generally adopts a self-tightening sealing structure, which uses the pressure of the primary side medium and the resilience of the pre-tightening spring to provide the sealing force. If the discharge system is abnormal, the back pressure of the medium on the secondary side will suddenly rise, which will offset the sealing force generated by the medium pressu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K17/04F16K17/10F16K31/36
CPCF16K17/048F16K17/10F16K31/36
Inventor 袁晟毅王宇翔郭松李朋洲谭曙时秦胜杰罗世洪张冬林
Owner NUCLEAR POWER INSTITUTE OF CHINA
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