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Improved ball valve

An improved ball valve technology, applied in the valve details, valve device, valve shell structure, etc., can solve the problems of smooth connection with dead angle, poor sealing performance, heavy valve weight, etc., to achieve smooth connection without dead angle, save Effects of reduced installation space and external dimensions

Active Publication Date: 2012-12-12
SHANGHAI HIGH & MEDIUM PRESSURE VALVE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the valve body of the existing ball valve is a split structure. The wall thickness of the ball valve forging of the ball valve with this structure is very thick, the weight of the valve is heavy, and the resistance to bending and extrusion of the pipeline is weak. Complex, large installation space, often hidden dangers of leakage channels
The curve inside the valve body is not smooth, there is a dead angle in the smooth connection with the pipeline, and the fluidity of the medium is poor
At the same time, due to the split structure, the sealing performance effect is also very poor
[0003] In addition, the surface of the ball and seat of the existing ball valve is subjected to strong erosion by the high-pressure throttling medium, which is easy to wear and corrode

Method used

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Embodiment Construction

[0018] Below in conjunction with accompanying drawing, the present invention will be further described as follows:

[0019] Valve body: The valve body is a welded forged steel structure with left and right valve bodies. The welding of the valve body is carried out in strict accordance with the welding process. It is welded by gas shielded welding or automatic submerged arc welding machine. All welds have passed 100% UT inspection.

[0020] Stuffing box: The stuffing box is welded on the valve body, and the leakage point is eliminated. At the same time, the device for preventing the valve stem from blowing out is installed on the gland, which is convenient for the disassembly and installation of the valve stem parts and can be replaced online (when the valve is not affected) Stem graphite seal.

[0021] Ball: Forged carbon steel or stainless steel ball, fixed construction. The material is A105, A350LF2, A182F304, the surface is supersonic sprayed tungsten carbide alloy, the ha...

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Abstract

The invention relates to an improved ball valve. Left and right valve bodies have all-welded forged steel structures; a stuffing box is connected with the valve bodies by welding; a stop pin is arranged on the stuffing box, and is matched with a ring groove face of a valve rod; a ball body has a fixed structure; a carbon tungsten alloy is sprayed on the surfaces of the ball body and a valve seat by an ultrasonic method; the hardness of a sealing face reaches HV900-1200; and spraying thickness is more than or equal to 25mu m. The improved ball valve has the advantages that: under the conditionof the same strength, the wall of an all-welded ball valve forged piece can be very thin, so that the weight of the valve can be reduced by one quarter, and the resistance to bending and extrusion ofpipelines is increased; and overall dimension is reduced, the structure is compact, installation space is saved, the curve inside the welding structure of the valve body is smooth, the pipelines are smoothly connected without dead angle, and media have high fluidity. The carbon tungsten alloy is sprayed on the ball body and the valve seat by the ultrasonic method, so that abrasion and corrosion can be resisted, the strength between an overlaying layer and a substrate reaches a metallurgical bonding level and the improved ball valve is enough to bear the impact of high-pressure media.

Description

[technical field] [0001] The invention relates to the technical field of ball valves, in particular to an improved ball valve. [Background technique] [0002] At present, the valve body of the existing ball valve is a split structure. The wall thickness of the ball valve forging of the ball valve with this structure is very thick, the weight of the valve is heavy, and the resistance to bending and extrusion of the pipeline is weak. Complex, large installation space, often hidden dangers of leakage channels. The internal curve of the valve body is not smooth, and there is a dead angle in the smooth connection with the pipeline, and the fluidity of the medium is poor. At the same time, due to the split structure, the sealing effect is also very poor. [0003] In addition, the surface of the ball and the valve seat of the existing ball valve bears the strong erosion of the high-pressure throttling medium, which is easy to wear and corrode. If the soft sealing structure is ad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16K5/06F16K27/10F16K27/06F16K5/08F16K25/04
Inventor 胡照国邓继林张兆锟关旭锋
Owner SHANGHAI HIGH & MEDIUM PRESSURE VALVE
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