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Vacuum isolation valve, bellows in vacuum isolation valve and manufacturing method thereof

A technology of vacuum isolation and bellows, which is used in sliding valves, valve details, valve devices, etc., can solve the problems of non-plasticizing of defoamer, affecting the stable production of bellows, and inability to decompose, and achieves positive pressure resistance and resistance. The effect of strong negative pressure capability, improved rigidity and economical manufacturing cost

Active Publication Date: 2016-09-07
JIANGSU NANTONG SHENTONG MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the influence of the purity and crystal form of the calcium oxide defoamer, the defoamer containing calcium oxide is not plasticized and cannot be decomposed, which affects the stable production of bellows

Method used

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  • Vacuum isolation valve, bellows in vacuum isolation valve and manufacturing method thereof
  • Vacuum isolation valve, bellows in vacuum isolation valve and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The present invention is on the basis of above-mentioned structure, as figure 1 , the valve stem 4 is also coated with a bellows 5, and the two ends of the bellows 5 are respectively sealed and connected with the valve cover 2 and the valve core 3; a mechanical seal is arranged between the valve stem 4 and the valve cover 2; the valve body 1 and the valve cover 2 are fixedly connected; the valve column 1c and the limiting plate 1a are fixedly connected to the pipe 1b; the valve core 3 and the valve body 1 are provided with an internal seal.

[0029] Such as figure 1 , the valve body 1 and the bonnet 2, the valve column 1c and the limit plate 1a and the pipe 1b are fixedly connected by welding; the temperature used for welding is above 650°, and the welding wire used for welding contains 50% tin. The fixed connection method of welding can improve the rigidity of the whole device, and long-term use will not cause vacuum loss; a layer of alloy layer is welded on the conta...

Embodiment 2

[0039]On the basis of Example 1, change the proportion of each component of the polyvinylidene fluoride coating, specifically including 25wt% white carbon black powder, 10wt% unsaturated acid, 15wt% EVA resin particles and 60wt% polyvinylidene fluoride resin Particles; change the thickness of the modified PVDF coating to 0.5 µm.

[0040] The method of the present invention is that before winding the metal corrugated layer, the modified polyvinylidene fluoride coating is sequentially coated on the inner wall and the outer wall of the metal corrugated layer, and the specific steps of the coating are as follows:

[0041] Slowly brush the modified polyvinylidene fluoride material on the inner wall of the flat metal mesh according to the two diagonals of the quadrilateral unit grid in the flat metal mesh in the direction consistent with the axial direction and radial direction of the cylindrical mold;

[0042] After one layer of brushing is completed, dry at room temperature for 0....

Embodiment 3

[0044] On the basis of Example 1, change the proportion of each component of the polyvinylidene fluoride coating, specifically including 23wt% white carbon black powder, 8wt% unsaturated acid, 12wt% EVA resin particles and 55wt% polyvinylidene fluoride resin Particles; change the thickness of the modified polyvinylidene fluoride coating to 0.6 µm.

[0045] The preparation method is the same as in Example 1.

[0046] The performance parameter test result based on embodiment 1, 2 and 3 is as follows:

[0047]

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PUM

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Abstract

The invention discloses a vacuum isolating valve. The vacuum isolating valve comprises a valve body, a bonnet, a valve core and a valve rod, wherein the valve rod is coated with a corrugated pipe, and two ends of the corrugated pipe are in sealed connection with the bonnet and the valve core respectively; a mechanical seal is arranged between the valve rod and the bonnet; the valve body and the bonnet are fixedly connected; a valve column, a limiting plate and a pipeline are fixedly connected. The vacuum isolating valve is compact in design and reasonable in structure and adopts the welding fixed connection method, so that the rigidity of the whole valve can be improved, and the vacuum loss can be avoided after long-term usage; according to the valve, the corrugated pipe is arranged between the bonnet and the valve core, the seal between the valve core and the bonnet can be effectively guaranteed by the aid of the corrugated pipe, and when the valve core is opened through the valve rod, smooth opening can be guaranteed by the aid of the elasticity according to characteristics of the corrugated pipe; when the corrugated pipe is connected with the bonnet and the valve core, the method of welding after threaded connection is adopted for the valve, so that the sealing performance of the valve can be greatly improved; the vacuum isolating valve is simple in structure, economical in manufacturing cost, lower in difficulty for an operator and applicable to large-scale popularization.

Description

technical field [0001] The present invention relates to a vacuum isolation valve. The invention also relates to a bellows in the vacuum isolation valve. The invention further relates to a method for manufacturing the bellows in the vacuum isolation valve. Background technique [0002] The types of vacuum isolation valves can be divided into wedge gate valves and parallel gate valves according to the sealing surface configuration. Wedge gate valves can be divided into: single gate type, double gate type and elastic gate type; parallel gate type Gate valves can be divided into single gate type and double gate type. According to the thread position of the valve stem, it can be divided into two types: rising stem gate valve and dark stem gate valve. At present, some vacuum isolation valves on the market are unreasonable in design and structure. In the case of long-term application and vacuum, it is very easy to cause vacuum loss, affect the normal operation of the entire equipm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16K3/12F16K3/30
CPCF16K3/0263F16K3/12F16K3/30F16K27/044
Inventor 高峰顾忠华蔡森华缪红建宗勇
Owner JIANGSU NANTONG SHENTONG MACHINERY