The gasket leakage :
General gasket leaks , there are four forms: interface leak , leak penetration , diffusion leaks, damage leak.
Penetration leak: soft gasket material because the material is mostly fiber, easy to dip appropriate media , in particular pressure . tie wraps Due to capillary phenomenon, the medium will penetrate into the low pressure side to form infiltration.
Interface Leak : The interface is not as gasket compression flange surface finish combined with improper flange deformation etc will leak in the sealed interface . For interface World leakage , the use of padded material can be clamped against the flange surface .
Destruction Leakage: sealing parts relatively poor working conditions , thermal deformation, often affected by vibration, shock , improper installation , fastening force is too large , used repeatedly , deformation , stress concentration, fatigue strength and damage than the material aging , deterioration etc will cause damage leak. This leakage causes the greatest impact hazard is also large , to strengthen prevention.
Diffusion Leakage: poor concentration , driven by the media or by sealing the gap sealing material produced by mass transfer and capillary leak . Diffusion is the result of molecular motion , and not one-way. Minimal pressure or vacuum in a sealed state , or sealed nitrogen, high security seal hydrogen and other permeable substances, as well as highly toxic , radioactive substances should pay special attention penetration and proliferation of two kinds of leaks.
pull tight security seals
pull tight security seals
2013年11月1日星期五
2013年10月31日星期四
Valve gasket damaged damaged bitter pit large tanker drivers
8 pm, Mengjin County Baihe Town territory Zhengsan Gong Lu Meng Road, near the buckle tanker spill occurred , but fortunately no casualties .
16:00 the day before , container seals a formaldehyde solution tanker transportation in Bangladesh village a big buckle road slope sections Mizoguchi leak , the county public security fire department rushed to the scene after the alarm .
Police on the scene saw the leaked formaldehyde solution to form a ditch along the roadside about 400 meters and a width of 1 meter trickle. In the relevant departments under the coordination of the car belongs transferred to another car company vehicle accidents within the formaldehyde solution pumped . Field staff to disclose rubbed salt formaldehyde solution and covered with mud after clearing, collection .
It is understood that the car is equipped with 10 tons of formaldehyde solution , because the tanker at the bottom of a valve gasket is damaged, resulting inside about 300 kg , containing 30% aqueous solution of formaldehyde leak. Formaldehyde is a kind of colorless gas with strong pungent odor , soluble in water , alcohol and ether .self-locking cable ties Formaldehyde is gaseous at room temperature , usually in the form of an aqueous solution .
Currently, the leaked scene disposal, the road returned to normal traffic .
16:00 the day before , container seals a formaldehyde solution tanker transportation in Bangladesh village a big buckle road slope sections Mizoguchi leak , the county public security fire department rushed to the scene after the alarm .
Police on the scene saw the leaked formaldehyde solution to form a ditch along the roadside about 400 meters and a width of 1 meter trickle. In the relevant departments under the coordination of the car belongs transferred to another car company vehicle accidents within the formaldehyde solution pumped . Field staff to disclose rubbed salt formaldehyde solution and covered with mud after clearing, collection .
It is understood that the car is equipped with 10 tons of formaldehyde solution , because the tanker at the bottom of a valve gasket is damaged, resulting inside about 300 kg , containing 30% aqueous solution of formaldehyde leak. Formaldehyde is a kind of colorless gas with strong pungent odor , soluble in water , alcohol and ether .self-locking cable ties Formaldehyde is gaseous at room temperature , usually in the form of an aqueous solution .
Currently, the leaked scene disposal, the road returned to normal traffic .
Valve gasket damaged damaged bitter pit large tanker drivers
8 pm, Mengjin County Baihe Town territory Zhengsan Gong Lu Meng Road, near the buckle tanker spill occurred , but fortunately no casualties .
16:00 the day before , container seals a formaldehyde solution tanker transportation in Bangladesh village a big buckle road slope sections Mizoguchi leak , the county public security fire department rushed to the scene after the alarm .
Police on the scene saw the leaked formaldehyde solution to form a ditch along the roadside about 400 meters and a width of 1 meter trickle. In the relevant departments under the coordination of the car belongs transferred to another car company vehicle accidents within the formaldehyde solution pumped . Field staff to disclose rubbed salt formaldehyde solution and covered with mud after clearing, collection .
It is understood that the car is equipped with 10 tons of formaldehyde solution , because the tanker at the bottom of a valve gasket is damaged, resulting inside about 300 kg , containing 30% aqueous solution of formaldehyde leak. Formaldehyde is a kind of colorless gas with strong pungent odor , soluble in water , alcohol and ether .self-locking cable ties Formaldehyde is gaseous at room temperature , usually in the form of an aqueous solution .
Currently, the leaked scene disposal, the road returned to normal traffic .
16:00 the day before , container seals a formaldehyde solution tanker transportation in Bangladesh village a big buckle road slope sections Mizoguchi leak , the county public security fire department rushed to the scene after the alarm .
Police on the scene saw the leaked formaldehyde solution to form a ditch along the roadside about 400 meters and a width of 1 meter trickle. In the relevant departments under the coordination of the car belongs transferred to another car company vehicle accidents within the formaldehyde solution pumped . Field staff to disclose rubbed salt formaldehyde solution and covered with mud after clearing, collection .
It is understood that the car is equipped with 10 tons of formaldehyde solution , because the tanker at the bottom of a valve gasket is damaged, resulting inside about 300 kg , containing 30% aqueous solution of formaldehyde leak. Formaldehyde is a kind of colorless gas with strong pungent odor , soluble in water , alcohol and ether .self-locking cable ties Formaldehyde is gaseous at room temperature , usually in the form of an aqueous solution .
Currently, the leaked scene disposal, the road returned to normal traffic .
Wafer soft seal butterfly valve characteristics
New features and butterfly valve in the course of a problem :
Currently, soft seal butterfly valve as a piping system used to achieve off and flow control components, has been in the petroleum, chemical, metallurgy, water and electricity , and many other fields has been very widely used . In the well-known butterfly valve technology , the sealing forms enclosed structure, sealing material for rubber , PTFE and so on. Restrictions due to structural features , suited high temperature, high pressure and corrosion resistance, abrasion resistance and other industries. Present a more advanced butterfly valve is a three eccentricity metal hard luggage seals butterfly valve, valve and seat components for the piece , seat sealing surface layer welding temperature, corrosion resistant alloys. Multilayer soft stacked ring fixed to the valve plate, this butterfly valve in comparison with the conventional high temperature , easy operation, open and close without friction, closed with the transmission of the torque increases to compensate for sealing , improved valve sealing performance and durability advantages .
One , as soft and hard stacked ring fixed in the valve plate, when the valve plate normally open state media, the formation of a positive sealing surface erosion, metal sheets laminated in soft sealing tape subject to erosion , direct impact on seal performance.
Second, by the structural constraints of the structure do not meet the following diameter DN200 valves, because the overall structure of the valve plate is too thick, large flow resistance .
Third, because the principle of three eccentric structure , the sealing surface of the valve plate seal between the valve seat is on the transmission of torque to the valve plate is pressed against the valve seat . Positive flow state, the higher the pressure medium sealed tight squeeze . When the flow channel upstream medium with media pressure valve plate and valve seat pressure between the units is less than the medium pressure, the security stickers started to leak .
Currently, soft seal butterfly valve as a piping system used to achieve off and flow control components, has been in the petroleum, chemical, metallurgy, water and electricity , and many other fields has been very widely used . In the well-known butterfly valve technology , the sealing forms enclosed structure, sealing material for rubber , PTFE and so on. Restrictions due to structural features , suited high temperature, high pressure and corrosion resistance, abrasion resistance and other industries. Present a more advanced butterfly valve is a three eccentricity metal hard luggage seals butterfly valve, valve and seat components for the piece , seat sealing surface layer welding temperature, corrosion resistant alloys. Multilayer soft stacked ring fixed to the valve plate, this butterfly valve in comparison with the conventional high temperature , easy operation, open and close without friction, closed with the transmission of the torque increases to compensate for sealing , improved valve sealing performance and durability advantages .
One , as soft and hard stacked ring fixed in the valve plate, when the valve plate normally open state media, the formation of a positive sealing surface erosion, metal sheets laminated in soft sealing tape subject to erosion , direct impact on seal performance.
Second, by the structural constraints of the structure do not meet the following diameter DN200 valves, because the overall structure of the valve plate is too thick, large flow resistance .
Third, because the principle of three eccentric structure , the sealing surface of the valve plate seal between the valve seat is on the transmission of torque to the valve plate is pressed against the valve seat . Positive flow state, the higher the pressure medium sealed tight squeeze . When the flow channel upstream medium with media pressure valve plate and valve seat pressure between the units is less than the medium pressure, the security stickers started to leak .
2013年10月28日星期一
Currently on the market often posing Corner There are three types of plastic glue
Strength aluminum alloy doors and sealing the corners of aluminum doors and windows as long as the use of special glue to set angle, but unfortunately most of the windows and doors factory and developers, as well as related administrative departments architectural design, supervision and other units did not really recognize the special Corner plastic windows and doors in improving the overall quality of the important role. Some assembly plant doors and windows do not use glue or wrongly Corner glass adhesive, structural adhesive, such as epoxy glue aluminum doors and windows dedicated Corner glue in use. Currently on the market often posing Corner adhesive glue into three categories:
1, glass, plastic, also known as silicone sealant; poor adhesion on aluminum, poor weather, easy to aging, low hardness, elasticity is too large, curing gel does not swell, can not make the corner yard stick closely with the cavity then become one.
2, structural adhesive for bonding aluminum poor, long curing time, products and more smell, does not swell when cured, can not produce high strength.
3, after curing epoxy adhesive inelastic, unable to adapt to the form of microseismic, easy crisp and broken, Corner after long-term strength is not enough, will produce cracking, dregs phenomenon.
Why do we have to use a dedicated advocate Corner gum? Because of special aluminum alloy doors and windows Corner glue has the following characteristics:
1, colloids are modified polyurethane-based adhesives, solvent-free, in line with environmental requirements.
2, initial curing time is short, about 10 minutes, will help improve production efficiency. Divided into single, two-component two kinds, more suitable for "Corner glue and corner connectors dispensing whole" two kinds of process requirements.
3, high hardness after curing, but not brittle, with low elasticity and excellent waterproof performance, so that angle code and section ductile adhesive wall connections, which make up, various parts of the corner of the window to reduce deformation, cracking conditions an effective solution to the problem of leakage corner windows and doors.
4, one-component adhesive glue is completely cured Corner, Corner profiles cavity with an effective part of the shear strength of the adhesive can be achieved 10.3N/MM2, component Corner Shear strength can reach 18N/MM2, greatly enhanced strength corner of the window. That is, ordinary 60 series of profiles of the shear strength can exceed Cutaway.
5, colloidal slightly foaming during the curing process, expanded, forming metal to metal between the elastic pad, the effective transmission of forces weaken, play a shock, the cushion effect.
6, weather resistance, the ability of -40 ° C +80 ° C temperature variation, white or translucent gel, the gel will not play in the short yellow. Corner two-component glue in 230 ° C high temperature tolerance of 30 minutes, suitable for powder coating and other post-processing needs.
7, with special cleaning agent with a small amount of excess glue is easy to clean,Fixed Length plastic seals will not harm the surface profile of the coating and paint, environmental non-toxic.
The author believes that the current market a lot to promote the use of the German "Wei Shi" series Corner combination of gum and related ancillary products, aluminum doors and windows corner for structural reinforcement and sealed professionally designed to meet the requirements of various groups angle is aluminum door and window factory and the developers of the most sensible choice.
1, glass, plastic, also known as silicone sealant; poor adhesion on aluminum, poor weather, easy to aging, low hardness, elasticity is too large, curing gel does not swell, can not make the corner yard stick closely with the cavity then become one.
2, structural adhesive for bonding aluminum poor, long curing time, products and more smell, does not swell when cured, can not produce high strength.
3, after curing epoxy adhesive inelastic, unable to adapt to the form of microseismic, easy crisp and broken, Corner after long-term strength is not enough, will produce cracking, dregs phenomenon.
Why do we have to use a dedicated advocate Corner gum? Because of special aluminum alloy doors and windows Corner glue has the following characteristics:
1, colloids are modified polyurethane-based adhesives, solvent-free, in line with environmental requirements.
2, initial curing time is short, about 10 minutes, will help improve production efficiency. Divided into single, two-component two kinds, more suitable for "Corner glue and corner connectors dispensing whole" two kinds of process requirements.
3, high hardness after curing, but not brittle, with low elasticity and excellent waterproof performance, so that angle code and section ductile adhesive wall connections, which make up, various parts of the corner of the window to reduce deformation, cracking conditions an effective solution to the problem of leakage corner windows and doors.
4, one-component adhesive glue is completely cured Corner, Corner profiles cavity with an effective part of the shear strength of the adhesive can be achieved 10.3N/MM2, component Corner Shear strength can reach 18N/MM2, greatly enhanced strength corner of the window. That is, ordinary 60 series of profiles of the shear strength can exceed Cutaway.
5, colloidal slightly foaming during the curing process, expanded, forming metal to metal between the elastic pad, the effective transmission of forces weaken, play a shock, the cushion effect.
6, weather resistance, the ability of -40 ° C +80 ° C temperature variation, white or translucent gel, the gel will not play in the short yellow. Corner two-component glue in 230 ° C high temperature tolerance of 30 minutes, suitable for powder coating and other post-processing needs.
7, with special cleaning agent with a small amount of excess glue is easy to clean,Fixed Length plastic seals will not harm the surface profile of the coating and paint, environmental non-toxic.
The author believes that the current market a lot to promote the use of the German "Wei Shi" series Corner combination of gum and related ancillary products, aluminum doors and windows corner for structural reinforcement and sealed professionally designed to meet the requirements of various groups angle is aluminum door and window factory and the developers of the most sensible choice.
Gear pump mechanical seal shortcomings
1) is more complex, demanding for processing
2) Installation and replacement of cumbersome, requiring workers to have a certain level of technology
3) fortuitous accident occurred when handling more difficult.
Preparatory work before sealing the highest bid:
1) Check the mechanical seal models. Specifications to check whether the requirements of the design drawings, so parts (extraordinary is the sealing surface, secondary seal) for damage. Deformation. Cracks phenomenon, if defective and must be replaced or repaired
2) Check the mechanical seal with the size of the parts, roughness, parallel with the design requirements
3) Using a small spring mechanical vehicle seals should be checked small springs are the same length and rigidity
4) Check the host runout. Swing amount and around the degree of compliance with the technical requirements, the sealed chamber meets the installation scale, sealed cover and whether the axis perpendicular to the general requirements: Shaft runout is less than ± 0.5mm: axis swing amount (rotation ring seal point) is not greater than 0.06mm: maximum around the axis is not greater than 0.05mm: sealing cover gasket contact with the plane on the vertical centerline of the promise is not bad 0.03 ~ 0.05mm.
5) should be kept clean, the extraordinary is the rotating ring and the stationary ring seal surface and the secondary seal surface should be free of impurities. container seal Dust does not agree with unclean loosen the sealing surface.
6) does not agree with the percussion instruments sealing element. To prevent the seal is damaged.
2) Installation and replacement of cumbersome, requiring workers to have a certain level of technology
3) fortuitous accident occurred when handling more difficult.
Preparatory work before sealing the highest bid:
1) Check the mechanical seal models. Specifications to check whether the requirements of the design drawings, so parts (extraordinary is the sealing surface, secondary seal) for damage. Deformation. Cracks phenomenon, if defective and must be replaced or repaired
2) Check the mechanical seal with the size of the parts, roughness, parallel with the design requirements
3) Using a small spring mechanical vehicle seals should be checked small springs are the same length and rigidity
4) Check the host runout. Swing amount and around the degree of compliance with the technical requirements, the sealed chamber meets the installation scale, sealed cover and whether the axis perpendicular to the general requirements: Shaft runout is less than ± 0.5mm: axis swing amount (rotation ring seal point) is not greater than 0.06mm: maximum around the axis is not greater than 0.05mm: sealing cover gasket contact with the plane on the vertical centerline of the promise is not bad 0.03 ~ 0.05mm.
5) should be kept clean, the extraordinary is the rotating ring and the stationary ring seal surface and the secondary seal surface should be free of impurities. container seal Dust does not agree with unclean loosen the sealing surface.
6) does not agree with the percussion instruments sealing element. To prevent the seal is damaged.
2013年10月27日星期日
Experts discuss starter gel sealed lead-acid battery type font
"Start -type gel sealed lead acid battery technology Seminar " was held recently in Beijing , high security bolt seals State Department Counselor Xu Dingming , Deputy Director of Science and Technology Development Plan and other related departments Liu Jinlin leaders and experts attended the meeting.
According to the project responsible person Zhang Dianding introduction , development polluting silicone body battery , validated by the former State Science and Technology Commission as a national key new product plan and the Torch Program and get Guangxi Science and Technology Progress Award. Sealed lead-acid battery -starter colloidal silica sol is added to a water-soluble after formation within the cell, through specific charging method to achieve the electrolyte into the gel to improve the relative performance of the battery . The product testing by the state authorities , some indicators than the national standard .
State Department counselor Xu Dingming noted that the project is an energy storage device , storage device is a new national energy policy revolution important part , cable ties not from the energy conservation , energy security is inseparable from the region , the smart grid can not be separated . Experts say : starting gel sealed lead-acid battery type is mainly used in automobile starters , the technology can also be applied to areas such as energy storage , belonging to the new energy industry to reduce pollution of the environment , in line with national industrial policy, its technology has reached the leading domestic level .
According to the project responsible person Zhang Dianding introduction , development polluting silicone body battery , validated by the former State Science and Technology Commission as a national key new product plan and the Torch Program and get Guangxi Science and Technology Progress Award. Sealed lead-acid battery -starter colloidal silica sol is added to a water-soluble after formation within the cell, through specific charging method to achieve the electrolyte into the gel to improve the relative performance of the battery . The product testing by the state authorities , some indicators than the national standard .
State Department counselor Xu Dingming noted that the project is an energy storage device , storage device is a new national energy policy revolution important part , cable ties not from the energy conservation , energy security is inseparable from the region , the smart grid can not be separated . Experts say : starting gel sealed lead-acid battery type is mainly used in automobile starters , the technology can also be applied to areas such as energy storage , belonging to the new energy industry to reduce pollution of the environment , in line with national industrial policy, its technology has reached the leading domestic level .
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