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Nuclear class II film pneumatic bellows stop valve

A bellows stop valve and bellows technology, applied in the direction of valve lift, valve details, valve device, etc., can solve the problems of not being able to close the valve quickly and automatically, large parts of the pneumatic device, and large external dimensions, etc., and achieve compact structure and long working stroke The effect of small, short strokes

Inactive Publication Date: 2012-07-25
DALIAN DAGAO VALVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bellows globe valve commonly used at present is generally composed of a valve body, a valve core, a valve stem, a valve cover, and a bellows. The up and down movement of the valve stem drives the valve core to control the opening and closing or opening of the valve. Sometimes the medium will leak out of the valve body through the sealing packing along the valve stem, causing the valve to run, pop, and drip, especially when it is used under high-pressure conditions, and the pneumatic device part of this type of valve is relatively large, and four The stud is connected to the valve, with large dimensions, heavy weight and poor rigidity, so the valve cannot be closed automatically and quickly in case of emergency

Method used

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  • Nuclear class II film pneumatic bellows stop valve
  • Nuclear class II film pneumatic bellows stop valve
  • Nuclear class II film pneumatic bellows stop valve

Examples

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Embodiment Construction

[0016] figure 1 , figure 2 and image 3 In the schematic diagram of the nuclear secondary membrane pneumatic bellows stop valve shown, the valve body 1 and the valve cover 8 clamp two wound gaskets 7 and one end of the bellows 6, and the valve stem 5 and the bellows 6 are worn in the middle, and the bellows The other end of the pipe 6 is connected with the valve stem 5, and the end of the valve stem 5 is connected with the valve clack 2, the positioning pin 3, and the valve clack pressure sleeve 4, and the valve stem 5 is connected to the pneumatic The device 22 is connected, and under the drive of the pneumatic device 22 and the opening and closing nut 23, the screw 24, and the lock nut 20 of the connecting piece, the closing and opening of the sealing surface between the valve disc 2 and the valve body 1 is realized; the pneumatic device 22 and the valve cover 8 Fasten with middle flange stud 9, middle flange nut 10 and anti-loosening washer 11, packing 12 is installed be...

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Abstract

A nuclear class II film pneumatic bellows stop valve belongs to the field of nuclear power valves used by large pressurized water reactor nuclear power station systems. Surfacing of hard alloy on both a valve seat and a valve clack enables sealing surfaces to be high in hardness, so that the valve is more wear-resistant and scour-resistant and is extremely resistant to corrosion. A Brinell hardness difference of 50 exists between the two sealing surfaces, so that excellent sealing property can be further guaranteed. A pneumatic device of a diaphragm structure is short in stroke, compact and flexible in structure, and a hand-operating mechanism can be mounted on the pneumatic device if needed. The pneumatic bellows stop valve is simple in structure, convenient in maintenance, short in opening and closing time by means of short operating stroke, and small in closing friction force, scour-resistant and reliable in sealing by means of conical surface sealing between the sealing surfaces of the valve clack and the valve seat.

Description

technical field [0001] The invention relates to the field of nuclear power valves used in large-scale pressurized water reactor nuclear power plant systems, in particular to nuclear secondary membrane pneumatic bellows cut-off valves. Background technique [0002] The nuclear secondary film pneumatic bellows stop valve is used for the reactor coolant system, safety injection system, waste heat export system, main steam system, chemical capacity system, nuclear power three-waste system of one million kilowatts and large pressurized water reactor nuclear power plant. Shut-off valve. The bellows globe valve commonly used at present is generally composed of a valve body, a valve core, a valve stem, a valve cover, and a bellows. The up and down movement of the valve stem drives the valve core to control the opening and closing or opening of the valve. Sometimes the medium will leak out of the valve body through the sealing packing along the valve stem, causing the valve to run,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K1/00F16K41/02F16K31/126F16K1/48F16K1/36F16K1/42F16K37/00
Inventor 肖箭陈力
Owner DALIAN DAGAO VALVE
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