Secondary expandable supplementary flexible graphite filler
A flexible graphite and secondary expansion technology, applied to valve details, engine components, shaft seals, etc., can solve problems such as leakage, poor sealing of packing, and influence on valve operation
Active Publication Date: 2016-01-20
谢贺义
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] At present, the domestic practice is to heat the expandable flake graphite to 1000 degrees to fully expand and roll it into a flexible graphite coil / sheet, and it will not expand again, because the high temperature of 1000 degrees will fully expand in place after a period of time. Then, after the graphite is worn out during the rapid valve stem movement, the sealing performance of the packing will become poor. Then, when it continues to be used, as the sealing performance of the packing decreases, leakage will occur, which will affect the operation of the entire valve and reduce the Service life of the valve
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0012] A secondary expandable supplementary flexible graphite filler of the present invention, first uses flake graphite as raw material, undergoes pre-expansion treatment; then performs expansion treatment within the range of temperature 350-370 degrees; and then compresses the expanded graphite After the finished packing is finished, a ring cover is respectively fixed and pressed on the upper end surface and the lower end surface of the finished packing; finally, the finished packing is soaked in a corrosion inhibitor for more than 1 hour, taken out and dried, and an insulating layer is formed on the surface of the finished packing .
[0013] Among them, the pre-expansion treatment is chemical oxidation treatment or electrochemical oxidation treatment, so that interlayer oxides are formed between graphite layers, such as chemical oxidation treatment, which is to add an oxidant to the graphite raw material for oxidation, such as a solid oxidant KMnO 4 、KCLO 4 etc., while liq...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to valve packing, in particular to secondary-expansion supplementary flexible graphite packing. First, crystalline flake graphite is adopted as a raw material and is subjected to treatment before expansion; then, in the range of temperature being 350-370 DEG C, the crystalline flake graphite is subjected to expansion treatment; the expanded graphite is stamped into a finished packing product; and finally, the finished packing product is put in a corrosion inhibitor for more than one hour for soaking and then is taken out to be dried, and the surface of the finished packing product forms an insulating layer. The graphite packing has the main characteristics as follows: after the graphite packing is abraded in a fast valve rod motion, the graphite packing generates heat by friction; and as the temperature rises, the graphite packing can be subjected to secondary expansion, the graphite packing and a valve rod achieve a good sealing state again, and therefore the problem that the graphite packing in the prior art is abraded to cause leakage is solved.
Description
technical field [0001] The invention relates to a valve packing, in particular to a secondary expandable supplementary flexible graphite packing. Background technique [0002] At present, the flexible graphite filler for valves used in our country is made of natural high-purity flake graphite through chemical and high temperature treatment, molded and rolled into flexible graphite coil / plate, and then molded into graphite filler. [0003] However, this kind of flexible graphite packing should deal with API622 standard 1500 high and low temperature switches, and European low leakage standards. The internal standards of various oil companies are difficult to meet the sealing requirements. The seal exceeds the standard. In response to this foreign technology barrier, we have improved the processing technology of the existing flexible graphite packing to meet the high-frequency switch sealing requirements. [0004] At present, the domestic practice is to heat the expandable fl...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): F16K41/02
Inventor 谢贺义
Owner 谢贺义