The hydraulic seal lip seals

U-shaped ring: U-ring sealing (container seal)performance is good, but is easy to roll alone, U-shaped seal friction resistance and with the increase of pressure. Therefore, the U-shaped seal lower working pressure is only suitable for low speed or movement of the hydraulic cylinders used.
V-ring: V-ring must be compatible with the supporting ring and pressure ring, V-ring cable sealing performance is better, according to the size of the working pressure seals used to determine the number of adjustments can be compensated by means of the pressure ring seals wear, V-shaped ring disadvantage is the complex structure, the friction resistance. Therefore, the V-shaped ring appropriate only relatively low velocity higher working pressure of the hydraulic cylinder used.
YX-ring: YX-ring with a cross-sectional width height ratio greater than 2, and based on the use of stability requirements, YX-ring work lip lip is shorter than the non-working, whereby the shaped seal into hole YX YX-shaped ring and shaft seal, YX-rings can be used without rolling, so YX-ring suitable for high-pressure, high-speed selection of the hydraulic cylinder.
Hydraulic Seals-O-Ring
O-ring cross-section of the O-simple shape, made of rubber, wear resistance as polyurethane, so that the hydraulic system is mainly used for static sealing.

Hydraulic oil on the performance of the seal

Regardless of what kind of material, should have the following properties:
1, with some mechanical and physical properties: such as tensile strength, elongation strength, elongation;
2, there is a certain degree of flexibility, hardness fit and compression set;
3, the working media, not prone to swelling, decomposition, hardening;
4, wear, there are some anti-tear properties;
5, high temperature, low temperature aging.
However, there is no sealing materials include all of the above properties, the need to work environment, such as temperature, pressure, media and sport mode to select the suitable sealing material, and through the development of materials with recipe to meet certain requirements. Or the use of composite materials or a combination of two or more structures in the form of play to their strengths, to achieve more comprehensive results.
Seal formation: dynamic security seal is divided into non-contact seals and contact seals. Non-contact seal mainly a variety of mechanical seals, such as: graphite packing ring, floating ring seals; rubber composite seals and rubber seals belong portfolio contact seals, relying on filling in a sealed chamber in the pre-compression force, leakage channel blocking sealing effect is obtained. Seals used in hydraulic systems are mostly static seal (seal), reciprocating seals (piston, piston rod seal) and rotating Meter seal.
Factors affecting the sealing effect: seal structure selection and film formation, pressure, temperature, material compatibility, dynamic sealing contact with the working surface of the material, hardness, geometry, surface finish.

Seals buy common sense of one-component epoxy-modified products

A density ranging from 1.1 to 2.8, the curing time is 50 degrees / 4 hours or 110 degrees / 30 minutes or 110 degrees / 50 minutes;
2 has a moderate thixotropic, Phi complex on the circuit board for electronic components can be covered and wrapped glue overcome on their own, but not flowing, bake curing process is not flowing,security seal keep the original shape;
3 cured black or amber light on the circuit board and electronic components adhesive power, and resistance to high temperature 200-300 ℃ and strong acid corrosion and erosion resistance to various solvents;
4 high adhesive strength, good heat resistance, excellent solvent resistance, adhesion strength can reach the device damage, damage to the device's temperature can be cured product from professional solvent erosion, and electronic circuit can element to get favorable protection to prevent technology leakage inside the device;
5 This product suitable for potting electronic devices confidentiality, after curing with a strong solvent resistance, can withstand long-term immersion of the organic solvent;luggage seals with a high heat distortion temperature, resistance to heat damage; also has good hardness and resistance to wear resistance, resistance to general cutting etch destruction.
6 potting electronic circuits using this product, with excellent anti-decryption sex.
7 product easy to use, long shelf life, high bonding strength, fast curing, low shrinkage, non-toxic characteristics.
8 70 days stored at room temperature, refrigerator storage than six months.

Oil sealing material (liquid) performance testing assessment

Rubber strap seals oil (liquid) performance, generally using standard test oil, according to test standard temperature conditions and the test time was immersed, through the comparison test values ​​before and after immersion (such as material hardness change, tensile strength change rate, Elongation change rate, volume change rate, compression, etc.), evaluation of its performance;
No1 Standard Oil is "low volume increased oil", a component of a mixture of mineral oil by solvent extraction, chemical treatment, dewaxed paraffinic residues and neutral oil;
No3 Standard Oil is a "high volume increased oil", by a selected naphthenic crude product obtained after vacuum distillation of two lubricating composition.
Different uses of the material is not the same evaluation index value.

Mechanical seal assembly technology dimension checking

1) Measurement of the size of the static ring sealing surface. This data is used to verify the static ring radial width, was elected with different friction materials, hard materials should be higher than the radial width of the friction surface soft big 1 ~ 3mm, otherwise easily lead to hard material embedded in soft material edges face the end go up.
2) Check the static ring and the shaft or sleeve of the gap, the stationary ring bigger than the shaft diameter generally 1 ~ 2mm, the ring, in order to ensure the volatility, the internal diameter than the shaft large 0.5 ~ 1mm, to compensate for shaft vibration and skewed, but the gap is not too large, otherwise it would snap ring seals and cause damage to the mechanical seal performance.
3) check the mechanical seal tight force. We usually talk about the mechanical seal tight end than the pressure force that is, face to the right than the pressure is too large, mechanical bolt security seals friction surface heating will accelerate the face wear, increased friction power; too small, easy to leak. Face than the pressure is determined when the mechanical seal design, we can only rely upon assembly clamping force measurement to determine the mechanical seal. Typically the measurement measuring method stationary ring mounted to the vertical distance gland face, and then measuring the gland ring end face to the vertical distance from the difference between the clamping force is the mechanical seal.
4) whether the length measurement compensation spring is changed. Spring changes will directly affect the performance of mechanical seal face pressure ratio. Under normal circumstances the length of the spring in the long run will be shortened to compensate for spring mechanical seal ring on the reasons but also because of the centrifugal force and deformation.
5) measuring static ring anti-rotation pin sub pin hole depth and length to prevent excessive static ring pin can not be assembled in place. This situation will damage the mechanical security seals.

Makeup along with seal wear is resolved

Conventional switching devices for water sealing principle defects has been improved, developed the automatic switch-type water makers. It is understood that most of the traditional sealing gaskets or seals used, set the switch on the moving parts, seals and close integration between moving parts, there must be no gap to achieve seal.

Switch on the reciprocating motion of the cargo seal wear large, over time there will be leaking. Fukuda fungi Machinery Co., Ltd. developed the water is breaking the traditional switch sealing principle, designed for frequent replenishment switch operation devised a new switch, the switch only change the traditional sealing principle in order to fundamentally solve the problem of seal wear can really realize the switch never leaks.

Sealing elements should be stored in dark, clean, dry and ventilated warehouse, the temperature should be maintained at between 0-25 ℃, humidity should be maintained at about 65%. Keep away from electrical equipment, fuel, chemicals and so on. To seal a good package, flat place, to prevent deformation, if stored correctly, rubber luggage seal with polyurethane sealing device performance can be maintained longer (3-5 years) does not change. If stored in the hydraulic oil, rubber sealing element storage period will be longer (up to 5-10 years), polytetrafluoroethylene (PTFE) and PTFE filler material without storage period.

Valve seal material classification

Valve seal material mostly mixed material, mixing the different components have different effects, be sure to say when customers buy clearance purposes. Valve seal material can be divided into two major categories of metal and nonmetal. Here are several common valve gasket material conditions of use:

Non-metallic valve seal material:

Valve seal material there are three main categories of non-metallic: Nylon, Teflon and synthetic rubber, let them explain the use and features:
Nylon has a low coefficient of friction, good corrosion resistance and other characteristics. Nylon used for temperature t ≤ 90 ℃, nominal pressure PN ≤ 32MPa ball valves, globe valves.
PTFE used for temperature t ≤ 232 ℃, nominal pressure PN ≤ 6.4MPa cut-off valve, gate valve, ball valve and so on.
Synthetic rubber, oil, temperature, corrosion and other comprehensive performance is better than natural rubber. General synthetic rubber temperature t ≤ 150 ℃, natural rubber t ≤ 60 ℃, nominal pressure PN ≤ 1MPa rubber for the cut-off valves, gate valves, diaphragm valves, butterfly valves, check valves, pinch valves and other valves seal.

Metal valve metal seal material:
Valve seal material non-metallic metal analogy lot more, let's enumerate and describe its parameters.
There are seven kinds of metal materials:
1, chrome steel
Chromium stainless steel commonly used grades are 2Cr13, 3Cr13 quenched, good corrosion resistance. Commonly used in the temperature t ≤ 450 ℃, nominal pressure PN ≤ 32MPa water, steam and oil and other media valve.
2, cast iron
Cast iron is used for temperature t ≤ 100 ℃, nominal pressure PN ≤ 1.6MPa, gas and oil used in gate valves, globe valves, plug valves, etc.
3, a copper alloy
Copper alloy commonly used materials are 6-6-3 and 58-2-2 bronze manganese brass. Copper alloy wear resistance, suitable for temperatures t ≤ 200 ℃, nominal pressure PN ≤ 1.6MPa water and steam, commonly used in gate valves, globe valves, check valves, plug valves, etc.
4, nitriding steels
Nitriding steel commonly used grades are 38CrMoAlA, carburizing treatment, with good corrosion resistance and scratch resistance. Commonly used in the temperature t ≤ 540 ℃, nominal pressure PN ≤ 10MPa power station gate valve.
5, chromium-nickel stainless steel titanium
Chrome-nickel stainless steel commonly used titanium grades 1Cr18Ni9ti, its corrosion resistance, erosion resistance and heat resistance is better. For temperature t ≤ 600 ℃, nominal pressure PN ≤ 6.4MPa steam, nitric acid and other media for the cut-off valve, ball valve and so on.
6, babbitt
Babbit for temperature t -70 ~ 150 ℃, nominal pressure PN ≤ 2.5MPa of ammonia shutoff valve.
7, Boronizing
Boronizing from the valve body or valve body material is directly machined sealing surface, then Boronizing surface treatment, security seal face wear very well. Used in power station blowdown valve.

Seal leaks treatment

Security seals of agricultural machinery and all kinds of mechanical equipment on the important parts, feeler IKO bearings are inserted into the above two between the roller and the outer circle around the center and the relative IKO bearings are widely used. This situation has seriously affected the agricultural machinery and a variety of mechanical equipment efficiency, not only increases fuel consumption and production costs, but also pollute the environment.

An oil seal works

1, the lubricant to the contact of the internal friction, and lubricant film formed by mixing and extruding by the fluid surface tension, the outer edge of the shaft and the seal edge to form a "new moon" face to prevent oil spill, play seal.
2, the work, the lip strap seals under pressure in the radial direction, is formed from 0.25 to 0.5 mm wide ring sealing contact. In the lubricating oil under pressure, the fluid penetrate between the seal edge and the shaft form a very thin film of oil.
3, free state, the oil seal lip smaller diameter than the shaft, with a certain amount of interference. After installation, the seal edge of interference and pressure from the tight contraction of the spring force on the rotation axis produce a certain radial pressure.

Second, the main factors causing oil seal leak

Seal Mifengbuyan is a major factor in causing oil spills. Forming a groove when the shaft is worn, even if still can not replace the seal when the seal is a lip seal with the shaft as the contact pressure drop, causing the lip seal after installation shaft diameter is too small amount of interference. Now with diesel engine crankshaft, for example, to analyze the Mifengbuyan is mainly due to: ① poor manufacturing quality seal; ② IKO bearing shaft or of poor quality; ③ using improper maintenance; IKO bearings measurement error does not mean that 10% of test tolerances can be relaxed ④ improper installation; ⑤ improper storage, adversely affected by environmental pollution.

Doors and windows sealing strip Selection Guide

The key to seal windows and doors. The effect of sealing, tape plays a key role.
Commercially used steel doors and windows sealed PVC material is generally modified, which played a key role is added plasticizers, plasticizers are currently relatively stable dioctyl phthalate, dibutyl, but the market higher prices. So some manufacturers to use unjust some cheap stuff instead: waste oil, the rest of the oil refinery base, etc., planted a big risk to future users.
Special Note: in the purchase of steel doors and windows Fixed Length plastic seal  strip should pay attention to the following aspects:
1, with the nose smell is the smell, the normal PVC material a little alcohol taste, very small, almost smell.
2, summer doors and windows sealed contact surface is stained with color profiles, yellow oil leakage.
3, see gravity. The same amount of doors and windows sealed with quality feel to light, contrary to weight. Regular manufacturers generally use a small proportion of calcium carbonate as a filler, some manufacturers are using talcum powder, TSP, to increase the proportion of products. Because when sales are priced by weight.
Inferior steel doors and windows sealed hazards:
1, environmental damage, odor, air pollution.
2, reducing tightness. Poor quality of the sealing strip containing plasticizers or use inferior substitutes, easy to aging winter harden, shrink. A gap between the glass and profiles, resulting in leakage, leakage of dust. Many users often find the rainy season layering plastic window parts inside out red liquid, that is between the window glass and the sealing strip steel liner corrosion caused by water entering. Not only greatly reduce the plastic window of the beautiful, but also greatly affect the life of doors and windows.
Although the proportion of small container security seals doors and windows, but the effect can not be discounted. Inferior seal doors and windows not only environmentally friendly, containing the odor, your body will cause harm, pollute the air.

Optional aluminum door four principles

Principle 1, the thickness of 1 mm or more appropriate
Aluminum alloy with high strength, corrosion resistance, not easy to deformation characteristics. Why not use some aluminum doors to a year left out of shape? After analysis, under normal usage, aluminum doors of the deformed, probably because of the use of aluminum profiles too thin due.
It is understood that the building materials market to consumers altar aluminum interior doors, profiles are 0.8 mm, 1.0 mm, 1.2 mm other thicknesses. Wherein the thickness of 1.0 mm or more better strength aluminum doors, in normal use, under the premise of 5-8 years will not be deformed. However, some small manufacturers cut corners in order to reduce production costs, even with a thickness of only 0.6 mm of aluminum profiles made bathroom door. Such aluminum doors because of insufficient thickness of the material, easily lead to deformation.
Reminder: thickness profiles, aluminum doors directly determine the merits. Consumers buy aluminum doors, do not choose to use freeloaders too thin aluminum door profiles.
Principle 2, watch wire seals, seal the glass layer was observed
Aluminum doors is also characterized by a strong decorative. Reporters visited some building materials stores found that most aluminum doors are inlaid with various colors of art glass. These glasses have a single layer, but also three-dimensional sense of strong, sound effects good double insulating glass.
Aluminum doors experts, selected aluminum doors with inlaid glass, especially the use of hollow glass design of products, be sure to pay attention to its sealing performance. If the seal is not good, it will lead to a hollow layer of filth, affect the appearance. Brand products of high quality sealing tape, sealing technology with advanced hot-round sealed, can effectively dustproof, waterproof and outstanding sound effects.
Reminder: Check the tightness of aluminum door glass compartment, in addition to viewing the front glass, plastic coatings are tight, we should also check the door strap seals on the back of the glass is flat, requiring no curling, no off slots.
Principle 3, the welding process to see whether the defects
"Aluminum doors of the production process is relatively simple, a lot of small manufacturers can produce, but the quality depends mainly on the production process is fine." Aluminum door experts, reflects the level of welding aluminum door quality. High quality aluminum doors, fine processing, welding stress, especially in some parts of stitching is very smooth. The poor quality of aluminum windows and doors, aluminum blind selection series and specifications, processing shoddy, door frames and other locations can not be spliced ​​corner flat, sometimes even larger gap.
Consumers purchase, should pay special attention to check for welding defects, such as open-welding, weld and so on. Depends on whether the closed door and the door frame dense, space is uniform, whether open and flexible.
Reminder: the consumer to check the welding aluminum doors, they still paint products are carefully inspected bright colors, texture is clear, note the paint does not rub obvious scratches, bubbles and other defects.
Principle 4, pick accessories hardware quality with stress
Aluminum door is usually installed in the bathroom, kitchen and other moist environment, metal hinges, door handles and other accessories quality is good or bad, is the key to life guaranteed aluminum doors.

Hollow doors to see how to identify seal glance

Essence of the problem is that the businesses will not necessarily use the same door pocket and door material, solid wood doors with solid wood Door does not mean that it will. If you do a solid wood door with MDF Door, because it does not contain wood fibers, water prone to foaming, can cause deformation of the door frame, so the best time of purchase ask whether the merchant Door and door of a material.
The selection is not solid wooden door, they usually go hand knocking method determines whether solid, but there are not many doors you knock on whether solid, filled with stuffing inside, knocked up with solid doors no difference, but also Some owners use to experiment with ways to move the weight, in fact, try not to come out the same effect, because there are a lot of manufacturers put on weight like wood filler to fill in the door, do not come out the same identification.
First, the color of the porter whether their home matches, and then tap, weigh judge the quality of the door. Filler door is generally divided into solid and partially solid, solid filler is certainly heavy, the price also expensive, and some solid relatively light, relatively cheap. However, the market also has some sinister business of some scraps as filler to increase the weight, be careful when consumers buy.
Secondly, you can consult the tightness of the door staff. That is, we say, "security seal", it's in the door pocket and door contact part, feels relatively soft. Formal enterprises will add Bolt seal , thus avoiding the seam after closing there is always a problem.
Again, that is asking Door material, because most doors if there are problems, mainly Door out of the question. Essence of the problem is that the businesses will not necessarily use the same door pocket and door material, solid wood doors with solid wood Door does not mean that it will. If you do a solid wood door with MDF Door, because it does not contain wood fibers, water prone to foaming, can cause deformation of the door frame, so the best time of purchase ask whether the merchant Door and door of a material.

Traditional inferior PVC seal symptoms of their products

1 show surface permeability precipitation phenomena, those fundamental and PVC waste oil is not compatible solution, seal surface is prone to grease, light-colored wooden door leaf surface of infected files and traces of yellow, resulting in contamination of the product, not even There are many environmental volatile substances, air pollution.
(2) When the so-called volatile or plasticizer exudation after the seal will lose its original softness and become very rigid, and quickly aging of contraction, the length contraction, broken cross-section contraction, so that part of the closed door there was a great gap tightness becomes poor (leakage, leakage of dust) until we lose sealing insulation effect, increasing the cost of air conditioning and heating, without the buffering effect, the doors of life will be greatly reduced.
Inferior PVC seal and advanced silicon rubber seal identification method:
One, with the smell whether there smell, the general PVC seal will be very pungent odor, normal silicone rubber sealing strip material will only have a little something alcohol taste, taste is very small, almost smell.
Second, while the PVC seal and silicone rubber cable seals  a period of time at a high temperature (on the roof or a sunny place), PVC sealing strip short time become very soft, grease seal surface precipitation, contamination dust, and yellow (very easy to suck the oil soil) permeability, left the dirty hands; silicone rubber seal did not change the physical properties, the family used a pressure cooker ring is silicone rubber, silicone rubber is the use of high temperatures and Non-toxic environmental performance, silicone rubber 200 ℃ working environment, no significant changes in physical properties.
Third, while the PVC seal and silicone rubber seal on the freezer, place a few hours, PVC sealing strip will become feel very stiff, easily broken, the physical properties of silicone rubber sealing strip unchanged. -50 ℃ silicone rubber physical properties without significant change.
Fourth, some of the cheaper prices will be a lot of filler seal, so the surface will not be very bright, dull, cut off seal off sections will be very rough, feel stiff, stretched almost inelastic, silicone rubber seal bright colors, texture soft, stretched extremely flexible sealing strip cut, broken section into a delicate sheen.
Five, burning, PVC sealing strip combustion blistering, shrinkage, take black acrid smoke, combustion is not sufficient, leaving hard plastic residue.
Six, look at the proportion of how much energy per kilogram of rice. PVC seal traders in the use of fillers made a great play tricks, some manufacturers for the pursuit of greater yields, (save a little electricity) using talcum powder, TSP do things like fillers, greatly increasing the proportion of seal products, (Our users generally buy mostly in kilograms, according to the length of use) so that virtually has actually increased costs severely reduced the quality Debu attempt. Add TSP PVC seal, you stretched by hand back and forth several times, the surface will be a small amount of a white powder. PVC seal the density should be 1.4-1.6. Silicone rubber tamper seal applications nanoscale silica as a filler reinforcing effect, light texture, density, specific gravity 1.1- 1.25 between, so the volume ratio than PVC sealing strip 20% more.
Silicone rubber seal burning almost smokeless, odorless, combustion, burning substance was a white powder.

Door seal structure and the corresponding structural Analysis

After years of development, automotive power were gradually formed their own technical characteristics and process on the basis that they are designed and manufactured products have their own characteristics and differences. As the body can best reflect the personality of the design features to better reflect this difference, particularly the design of the door structure, we can find a good variety in form and the manufacturing process of the door structure is different. After a large number of the current market, some mainstream sedan body structure analysis, summarized typical car door sheet metal structure and the corresponding door sealing (printed cable ties)system.
Door sheet metal structure and composition of the door sealing system
Door sheet metal is the most important part of the inner door panel and car door panels, they will form a closed cavity, we usually windowsill above part is called the window frames, window frames with sealing strips for fixed door glass and the guide glass lifts, window sills below the cavity can be arranged several reinforcing beams, stiffeners and some functional accessories, such as window regulator, door locks and glass.

Door seal system is mainly for two areas, one area is sealed doorway, which rely mainly installed in the side of the flange openings around a circle on the side door seal mounted on the door or the door seal to the outer circle Seal the entire doorway. Some models have a seal laps, some with only a lap seal, different models depending on the performance requirements or cost objectives to select in what sealed policies. Another door is a door area to be sealed area, which rely mainly on the window frame and glass run channel seal seals the inner and outer window to implement two meter seals  but also they serve to window glass can be smoothly up and down elevating the role, usually glass run channel seal is the most demanding vehicle sealing systems, the structure of the most complex.

Container seals in the course of the process of what precautions

security seals is a legal protection of a product, but also in related processes entirely relevant regulations, but you must use the time to pay attention to when using seals related processes.

1 seal by the dispatcher brought out from the warehouse to confirm a good seal numbers kept by the dispatch room, and the establishment of seals used ledger;
2 Use the sealing department to receive according to the number of seals, seal must be used by the receiving unit management personnel only after receiving confirmation without permission are not free to receive the seal. Seal Seal recipients must collect records indicate the time of collection, use area, volume, number, and signature;
3 Seal recipients must keep the seal collar, not free loan, transfer, copy, forgery;
4 all my company be sealed into the oil processing factory must fill seal single seal on a single seal to indicate the exact location, number and signature confirmation, etc., and metal cable ties to keep a single, non- Loss;
5 oil shipped to the destination or foreign oil into the plant, before unloading on the vehicle by hand seals to be checked. After checking the seals single handed timely dispatch room, by the scheduling staff numbered seal number and check;
6 public service area seals playing in the sale contract must have someone to follow-up examination, seals kick notify management personnel monitor or inspect squad above, the regional duty cadres must ensure that not less than ten percent of the search car rates ;
7 unloading port for individual vehicles without rear or no gasket must be equipped before the back cover for loading and unloading;
8 foreign oil must also be sealed during loading process, sealed and must be checked by the relevant person in charge confirmed.

Qiu Xiao Meng cool seals security seals

One thousand outside the bright moon, clouds thick heavy wind. No http night, a ray of autumn, thick clear worry. Resting tail moon, low tail Acacia. Cup of strong wine, leisure Gu million wild light in water. Sit fall over the first, it was getting hot down. To think, the breeze, the Indus flower pieces fall, creek gradually drip drip, door heart, a seat bamboo bed, satisfied. Autumn, an indisputable human ground scattered thoughts colorful, heat sad season.
Autumn to autumn to go, Xiao Meng to tail. Whispering this side, the heart is resting deep thoughts disintegrated, the fog seemed to fall into. Negative security seals killed trace black out days into the heavy round pace off over black out, the original go by is a fog. All quiet scary little cry, and some just flat day to tone. Like in the West Bank under the foam seals, floating like Gu Ming, quietly a hit, but it broke.Bolt seal
This was authentic, you can speak without thinking about the need to weep. Going through grief, sorrow speed, twists and turns and so on. . . The situation too, was eventually buried under the dust of past night. Its really painful, speed worries, just as cloudy, rainy, like alternation. Why should correct solution where tears fall sky.
Container seals wire seals plastic seals & n bsp; Meiko off over the side of the black day, sit dawn sky. Breathe as one old Ying space, riding death dawn, outside the circle before, people still stick to their suspicious death of a dream negative thinking, heroic lines into.Cable tie