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Horizontal type dual-way seal pilot operated safety valve

A pilot-operated safety valve, two-way sealing technology, used in safety valves, lift valves, valve details, etc., can solve the problems of high quality requirements of sealing rings, poor positive pressure sealing performance, poor negative pressure sealing performance, etc., to reduce maintenance. The effect of maintaining equipment and replacing parts, improving sealing, and reducing the use of parts

Pending Publication Date: 2020-05-19
HARBIN HBC VALVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing MSR pilot-operated safety valves all adopt a vertical structure. When the MSR starts and stops (negative pressure condition), the absolute pressure on the inlet side of the safety valve is close to 0MPa, the outlet side is atmospheric, and the absolute pressure is close to 0.103MPa. The pressure on the inlet side is greater than the pressure on the inlet side. Under the action of the pressure difference between the outlet side and the inlet side, the main valve disc tends to open. At this time, only the main valve spring force is used to limit the main valve disc from opening. The negative pressure sealing performance is poor, and the MSR operates normally. (positive pressure working condition), the pressure on the inlet side of the safety valve is MSR working pressure, the outlet side is the atmosphere, and the pressure on the inlet side is greater than the pressure on the outlet side. The vertical structure MSR pilot-operated safety valve only relies on the spring preload of the main valve as the main valve. The sealing pair provides sealing force, the positive pressure sealing performance is poor, and the sealing part needs to use a sealing ring with high sealing performance, which increases the cost. The sealing ring is a vulnerable part, which affects its sealing performance at high temperature and affects the quality of the sealing ring. The requirements are high, the existing main valve seat is set on the inlet side of the main valve body, and the parts are arranged vertically along the centerline of the main valve body inlet, the shockproof effect is poor, and the connection parts are easy to loosen during the vibration process , resulting in poor sealing performance and affecting service life

Method used

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  • Horizontal type dual-way seal pilot operated safety valve
  • Horizontal type dual-way seal pilot operated safety valve
  • Horizontal type dual-way seal pilot operated safety valve

Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0028] Specific implementation mode one: combine Figure 1-Figure 6 Describe this embodiment, a horizontal two-way sealed pilot-operated safety valve in this embodiment, including a main valve 1, a primary pilot valve 2, a secondary pilot valve 3 and a vacuum device 4, the main valve 1 is respectively connected to the vacuum through the intake pipe 5 The device 4 is connected with the primary pilot valve 2, the secondary pilot valve 3 is installed with the main valve 1, and the primary pilot valve 2 is connected with the secondary pilot valve 3.

specific Embodiment approach 2

[0029] Specific implementation mode two: combination Figure 1-Figure 6 Describe this embodiment, a horizontal two-way sealed pilot-operated safety valve in this embodiment, the main valve 1 includes an inlet cavity 101, an outlet cavity 102, a main valve disc 103, a main valve stem 104, and a main valve piston 105 , the main valve piston bushing 106, the main valve spring 107, the main valve bonnet 110, the main valve piston cavity 111, the main valve blocking plate 112 and the main valve piston back pressure cavity 113, the inlet cavity body is fixedly connected with the main valve piston cavity, The main valve piston 105 separates the main valve piston cavity 111 from the main valve piston back pressure cavity 113. The total volume of the main valve piston cavity 111 and the main valve piston back pressure cavity 113 remains unchanged. As the pressure changes, the main valve piston cavity 111 The volume change of the main valve piston back pressure chamber 113 is inversely ...

specific Embodiment approach 3

[0030] Specific implementation mode three: combination figure 1 , Image 6 Describe this embodiment, a horizontal two-way sealed pilot-operated safety valve in this embodiment, the main valve piston bushing 106 is processed with a groove 109, and the connection between the inlet cavity 101 and the main valve piston cavity 111 is processed with a first The drainage channel 108, the first drainage channel 108 connects the inlet cavity 101 and the groove 109, the condensed water in the main valve piston chamber 111 enters the groove 109, flows through the first drainage channel 108, and finally is discharged through the inlet cavity 101 , Effectively prevent the condensed water from affecting the main valve 1, and ensure the precise action and sensitive response of the main valve 1.

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Abstract

The invention relates to a horizontal type dual-way seal pilot operated safety valve, and belongs to the technical field of overpressure protection devices of GW level nuclear power unit moisture separator reheaters (MSR for short). Under various working conditions, seal performance is good, the quality needs for a seal ring are low, cost is reduced, the influence of the running condition on the seal ring is small, maintaining is easy, manpower cost is saved, a horizontal structure is adopted, the gravity center is reduced, the anti-vibration effect is good, the valve comprises a main valve, aprimary pilot valve, a secondary pilot valve and a vacuum device, the main valve is connected with the vacuum device and the primary pilot valve through an air inlet pipe, the secondary pilot valve and the main valve are mounted, and the primary pilot valve and the secondary pilot valve are connected.

Description

technical field [0001] The invention relates to a horizontal two-way sealed pilot-operated safety valve, which belongs to the technical field of overpressure protection devices for steam-water separation reheaters (abbreviated: MSR) of mega-kilowatt nuclear power units. Background technique [0002] The existing MSR pilot-operated safety valves all adopt a vertical structure. When the MSR starts and stops (negative pressure condition), the absolute pressure on the inlet side of the safety valve is close to 0MPa, the outlet side is atmospheric, and the absolute pressure is close to 0.103MPa. The pressure on the inlet side is greater than the pressure on the inlet side. Under the action of the pressure difference between the outlet side and the inlet side, the main valve disc tends to open. At this time, only the main valve spring force is used to limit the main valve disc from opening. The negative pressure sealing performance is poor, and the MSR operates normally. (positive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K1/00F16K1/32F16K1/36F16K17/04F16K27/02F16K27/08F16K31/363
CPCF16K1/00F16K1/32F16K1/36F16K27/08F16K27/02F16K31/363F16K17/04
Inventor 孙明宇万胜军王勇李大猛胡海鸥高德明
Owner HARBIN HBC VALVE