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The butterfly valve (English: butter flyvalve) refers to the closing part (disc or butterfly plate) is a disc, revolving around the valve shaft to achieve the opening and closing of a valve, mainly used in the pipeline to cut off and throttle. Butterfly valve opening and closing parts is a disc shaped butterfly plate, in the valve body around its own axis rotation, so as to achieve the purpose of opening and closing or adjustment. Butterfly valve fully open to fully closed is usually less than 90° butterfly valve and butterfly rod itself has no self-locking ability, in order to the positioning of the butterfly plate, to install worm gear reducer on the valve stem. Using worm gear domain speed device, not only can make the butterfly plate with self-locking ability, make the butterfly plate stop in any position, but also can change the valve performance. The characteristics of the industrial butterfly valve can withstand high temperature, the applicable pressure range is higher, the nominal diameter of the valve is large, the valve body is made of carbon steel, the sealing ring of the valve plate (the butterfly valve is sealed) is made of metal ring instead of rubber ring.
ZHM molybdenum alloy is a new type of molybdenum alloy. Zirconium and hafnium play both solid solution strengthening and dispersion strengthening with composite carbides, and their strengthening effect and high temperature stability are far better than titanium and zirconium alloys, which are marked as ZHM molybdenum alloys.
FFKM perfluoroether rubber O-ring
It is a terpolymer of perfluoro(methyl vinyl) ether, tetrafluoroethylene and perfluoroolefin ether. Also known as perfluororubber
The principle of achieving "self-sealing" effect: The pressure type seal in the contact dynamic seal is the contact pressure formed between the seal and the coupling surface through the pressing force generated by the pre-compression force and the medium pressure. The higher the medium pressure, the greater the contact pressure, which makes the seal The parts are tightly fitted with the coupling to block the leakage channel and achieve a "self-sealing" effect. The self-sealing self-tightening seal uses the back pressure generated by the deformation of the seal itself to increase with the increase of the medium pressure, so as to achieve the "self-sealing" effect.
The valve core of the dome valve is a spherical dome. During the opening and closing process of the dome valve, there is a gap of about 2mm between the valve core and the rubber sealing ring, so that the valve core and the rubber sealing ring can move in a non-contact manner. The purpose is to There is no friction between the valve core and the sealing ring to reduce wear. The pneumatic actuator of the dome valve is a fully enclosed rotary push rod type cylinder, which directly drives the dome valve to rotate, effectively preventing the occurrence of wear and leakage caused by dust entering it.
Polyurethane
Fluorine rubber
Nitrile rubber
POM support ring
Phenolic cloth support ring
Under the condition of low pressure, the U-shaped Y-shaped sealing ring only relies on the interference deformation of the lip to generate the seal. Due to the small contact area, the friction force is relatively low. As the pressure increases, the elastic deformation of the lip increases, stretching, When the compression and bending stress increases, the radial pressure of the U-shaped ring automatically increases, and the length of the contact with the sealing surface continues to increase until the entire axial length of the U-shaped ring is in contact with the sealing surface, thereby ensuring good sealing performance under high pressure. The U-shaped Y-ring is the most commonly used oil seal in hydraulic cylinders. It is a typical lip seal and can obtain a good seal whether it is used for the piston or the piston rod.
The wide variety of sealing materials increases the general adoption of the performance characteristics of the Y-shaped sealing ring. At the same time, the design of the sealing structure, through the skillful hands of Dongsheng designers, produces various types of seals to form the pursuit of the machinery and equipment industry. Select the correct sealing ring material according to the working equipment conditions of the hydraulic seal. The commonly used rubber materials for the hydraulic Y-shaped sealing ring include nitrile rubber (NBR) and fluorine rubber (FKM) with strong heat resistance and oil resistance; The polyurethane rubber material is selected for the requirements of abrasion resistance and pressure resistance.
The wide variety of sealing materials increases the general adoption of the performance characteristics of the Y-shaped sealing ring. At the same time, the design of the sealing structure, through the skillful hands of Dongsheng designers, produces various types of seals to form the pursuit of the machinery and equipment industry. Select the correct sealing ring material according to the working equipment conditions of the hydraulic seal. The commonly used rubber materials for the hydraulic Y-shaped sealing ring include nitrile rubber (NBR) and fluorine rubber (FKM) with strong heat resistance and oil resistance; The polyurethane rubber material is selected for the requirements of abrasion resistance and pressure resistance.
The wide variety of sealing materials increases the general adoption of the performance characteristics of the Y-shaped sealing ring. At the same time, the design of the sealing structure, through the skillful hands of Dongsheng designers, produces various types of seals to form the pursuit of the machinery and equipment industry. Select the correct sealing ring material according to the working equipment conditions of the hydraulic seal. The commonly used rubber materials for the hydraulic Y-shaped sealing ring include nitrile rubber (NBR) and fluorine rubber (FKM) with strong heat resistance and oil resistance; The polyurethane rubber material is selected for the requirements of abrasion resistance and pressure resistance.
The wide variety of sealing materials increases the general adoption of the performance characteristics of the Y-shaped sealing ring. At the same time, the design of the sealing structure, through the skillful hands of Dongsheng designers, produces various types of seals to form the pursuit of the machinery and equipment industry. Select the correct sealing ring material according to the working equipment conditions of the hydraulic seal. The commonly used rubber materials for the hydraulic Y-shaped sealing ring include nitrile rubber (NBR) and fluorine rubber (FKM) with strong heat resistance and oil resistance; The polyurethane rubber material is selected for the requirements of abrasion resistance and pressure resistance.
The wide variety of sealing materials increases the general adoption of the performance characteristics of the Y-shaped sealing ring. At the same time, the design of the sealing structure, through the skillful hands of Dongsheng designers, produces various types of seals to form the pursuit of the machinery and equipment industry. Select the correct sealing ring material according to the working equipment conditions of the hydraulic seal. The commonly used rubber materials for the hydraulic Y-shaped sealing ring include nitrile rubber (NBR) and fluorine rubber (FKM) with strong heat resistance and oil resistance; The polyurethane rubber material is selected for the requirements of abrasion resistance and pressure resistance.
The wide variety of sealing materials increases the general adoption of the performance characteristics of the Y-shaped sealing ring. At the same time, the design of the sealing structure, through the skillful hands of Dongsheng designers, produces various types of seals to form the pursuit of the machinery and equipment industry. Select the correct sealing ring material according to the working equipment conditions of the hydraulic seal. The commonly used rubber materials for the hydraulic Y-shaped sealing ring include nitrile rubber (NBR) and fluorine rubber (FKM) with strong heat resistance and oil resistance; The polyurethane rubber material is selected for the requirements of abrasion resistance and pressure resistance.
The installation and assembly of the step seal is also to install the O-ring first, and then install the wear ring of the step seal. When installing the wear ring, first press the wear ring inward in the diameter direction, and then install the wear ring to the groove. inside the groove, and then smooth out the deformation by hand. When installing in winter in the north, first heat the wear-resistant ring and then put it on the shaft. After cooling, install it according to the above method. When placing the shaft, you must pay attention to observe whether the shaft is completely inserted into the wear-resistant ring. At the same time, pay attention to the guide belt not to get stuck. Keep the shaft, otherwise the STE seal may be crushed because the guide belt is squeezed out of the groove.
The Gree ring is composed of a rubber O-ring and a polytetrafluoroethylene ring. The material is PTFE + NBR. In special cases, the rubber elastomer nitrile rubber NBR adopts fluorine rubber FKM. It can be divided into grid ring for hole and grid ring for shaft, but its sealing effect is the same. According to its own deformation, it will produce higher initial contact stress on the sealing surface, preventing the leakage of pressureless liquid. When the hydraulic cylinder is working, the pressure liquid squeezes the square sealing ring to the maximum extent through the elastic deformation of the o-shaped sealing ring, so that it is close to the sealing surface and generates a higher additional contact stress that increases with the pressure of the pressure liquid. Together with the initial contact stress, the leakage of the pressurized liquid is prevented.
Referred to as star ring, also known as X-shaped ring, its size is represented by inner diameter d1 and section diameter d2. The star ring is a sealing element that can seal in two directions. It is installed in various forms of grooves and its radial or axial pre-compression gives the star ring the initial sealing ability, which increases with the increase of pressure. Great sealing force. Under the action of pressure, the cross-sectional shape of the star ring will make the pressure evenly transmitted to all sides, so it has a good sealing effect.
V-type fluororubber cloth oil seal
The V-shaped sealing ring has a V-shaped section and is also a lip-shaped sealing ring. The V-shaped sealing device consists of three parts: support ring, sealing ring and pressure ring. The standard angle of the V-shaped seal is 90°, and 60° is also used in special occasions. The support ring is an important part to support the V-shaped sealing ring. Its section is thick and strong, the size is accurate, and the concave angle is the same (90°) or slightly larger than that of the V-shaped sealing ring, so that the sealing ring can be placed stably. The function of the pressure ring is to create an initial compression amount for the V-shaped sealing ring to make it fully contact with the sealed surface, and to adjust the compression amount of the V-shaped sealing ring. EUB Industrial Design. China In the free state, the outer diameter of the lip of the V-ring is larger than the inner diameter of the packing cavity, and the inner diameter of the lip is smaller than the outer diameter of the piston rod. In this way, there will be some deformation after assembly. Due to the action of the support ring, this deformation occurs only at the tip of the lip and at its junction...)
V-type nitrile rubber cloth combination sealing ring
Product use: used for the sealing of the piston and the piston rod of the reciprocating ultra-high pressure hydraulic cylinder Scope of application: hydraulic cylinders for metallurgy, mining, general equipment
UPi Oil Seal
TDI type shaft sealing ring is composed of a high-performance polyurethane U-shaped oil seal and a PTFE slip ring added with bronze powder. Its special design can reduce the friction at the root of the oil seal and reduce the residual oil carried out of the piston rod. Used in conjunction with a single-acting wiper ring. There is interference at the PTFE ring, and it will generate stronger pressure on the piston rod after being subjected to oil pressure. Its function is similar to the step seal, so sometimes a single TDI oil seal can replace the main oil seal + buffer ring.
Performance and use : SYPGW piston seal has good wear resistance, low friction coefficient and easy installation. Material : The main sealing material is imported composite PTFE, the support ring is POM, and the rubber is NBR (or FKM) 70Shore A. Working conditions: Working pressure: ≤50Mpa. Working temperature: -40~+110℃. Working speed: ≤1.2m/s. Medium: commonly used hydraulic medium. design standards: Groove dimensions conform to B+S's PHD and Parker's CT groove standards.
KDAS combination sealing ring is a two-way acting piston sealing ring. This combination sealing ring is composed of an elastic rubber ring, two additional retaining rings and two wear-resistant rings. This design provides a compact combination of sealing and guiding, and is suitable for combined sealing rings installed in closed grooves. The combined sealing ring includes an elastic toothed sealing ring, two retaining rings and two wear-resistant rings. There is a real sealing element in the middle; a retaining ring and a wear ring are placed on each side. The retaining ring prevents the sealing ring from being squeezed into the gap; the sealing ring in the middle is a toothed sealing ring, which can play a good sealing role when it is stationary and moving. The function of the wear ring is to guide the piston in the cylinder and bear the radial force.
This product has a good dust-scraping effect, and even has a good dust-proof effect on firmly bonded dust. Wear-resistant, long service life, has the function of saving and returning the residual oil in reverse, using elastic material, which can reduce the friction force. Suitable for reciprocating, oscillating or rotary motion systems.
The JA type dust ring is a seal used for dustproofing at the exposed part of the piston rod or valve rod of the reciprocating oil cylinder. Or it can be used anywhere as long as it plays a role in preventing dust. Wide range of use, easy installation and low cost are its biggest features.
The JA type dust ring is a seal used for dustproofing at the exposed part of the piston rod or valve rod of the reciprocating oil cylinder. Or it can be used anywhere as long as it plays a role in preventing dust. Wide range of use, easy installation and low cost are its biggest features.
The JA type dust ring is a seal used for dustproofing at the exposed part of the piston rod or valve rod of the reciprocating oil cylinder. Or it can be used anywhere as long as it plays a role in preventing dust. Wide range of use, easy installation and low cost are its biggest features.
This product has a good dust-scraping effect, and even has a good dust-proof effect on firmly bonded dust. Wear-resistant, long service life, has the function of saving and returning the residual oil in reverse, using elastic material, which can reduce the friction force. Suitable for reciprocating, oscillating or rotary motion systems.
The double lip seal is double duty: Seal the lubricating oil in the bearing cavity to ensure the formation of a continuous oil film (the oil film plays a bearing role and bears the weight of the roll and the working load of the rolling mill). Seal the external cooling water, rolling oil, iron filings, dust and other sundries to prevent them from infiltrating into the bearing cavity, avoid the contamination and failure of the lubricating oil in the cavity and cause the bearing to burn out, and maintain the normal operation of the bearing.
QY series sealing ring is the most commonly used sealing ring in oil cylinder, it is a typical lip sealing ring. In the case of low pressure, the seal is only produced by the interference deformation of the lip, and the friction force is relatively low due to the small contact surface. As the pressure increases, the elastic deformation of the lip increases, the tensile, compressive and bending stresses increase, the radial compression force of the sealing ring automatically increases, and the length of contact with the sealing surface continues to increase until the entire axial length of the sealing ring Contact with the sealing surface to ensure good sealing under high pressure
QY series sealing ring is the most commonly used sealing ring in oil cylinder, it is a typical lip sealing ring. In the case of low pressure, the seal is only produced by the interference deformation of the lip, and the friction force is relatively low due to the small contact surface. As the pressure increases, the elastic deformation of the lip increases, the tensile, compressive and bending stresses increase, the radial compression force of the sealing ring automatically increases, and the length of contact with the sealing surface continues to increase until the entire axial length of the sealing ring Contact with the sealing surface to ensure good sealing under high pressure
Main advantage: It acts as a one-way valve in the entire sealing system, so it is no longer necessary to add other one-way valves to the system to automatically select the best buffer stroke. Very good cushioning even in the case of slight eccentricity due to automatic centering
The EU-type piston rod dust-proof sealing ring for the cylinder is formed by a single part, and its main functions are sealing, dust-proof and fixing.
The TB iron shell oil seal is the exposed skeleton oil seal. Compared with the inner skeleton oil seal, the iron shell oil seal has the characteristics of good rigidity, easy installation, safe use, accurate positioning, high coaxiality, good heat conduction and heat dissipation, and saving glue. The outer skeleton oil seal is the centerless grinding of the skeleton of the oil seal to improve the coaxiality of the outer wheel and the inner wheel after the oil seal is assembled, thereby improving the dynamic sealing accuracy of the skeleton oil seal and better preventing oil leakage. The outer frame oil seal requires higher installation machining accuracy. Rubber and plastic material: nitrile rubber (letters represent NBR) heat-resistant 120 degrees, good oil resistance, EPDM rubber (letters represent EPDM) heat-resistant 150 degrees, not oil-resistant silicone material (letters represent VMQ) heat-resistant 220 degrees oil-resistant general poly4 Fluoroethylene (letters represent PTFE), heat-resistant 280 degrees, good oil resistance, fluorine rubber (letters represent FKM), heat-resistant 200 degrees, good oil resistance, polyurethane (letters represent PU), heat-resistant and 90 degrees wear-resistant.
The split skeleton oil seal is a kind of industrial seal. Simply put, it is a sealing element used to seal the medium, and it can also prevent external dust and dirt from entering the internal contamination medium. Moreover, its convenient and quick disassembly and assembly method has become a commonly used mechanical equipment sealing product in the industry.
The split skeleton oil seal is a kind of industrial seal. Simply put, it is a sealing element used to seal the medium, and it can also prevent external dust and dirt from entering the internal contamination medium. Moreover, its convenient and quick disassembly and assembly method has become a commonly used mechanical equipment sealing product in the industry.
Fluorine rubber opening oil seal
The split skeleton oil seal is a kind of industrial seal. Simply put, it is a sealing element used to seal the medium, and it can also prevent external dust and dirt from entering the internal contamination medium. Moreover, its convenient and quick disassembly and assembly method has become a commonly used mechanical equipment sealing product in the industry.
Split skeleton oil seal is a kind of industrial seal. Simply put, it is a sealing element used to seal the medium, and it can also prevent external dust and dirt from entering the internal contamination medium. Moreover, its convenient and quick disassembly and assembly method has become a commonly used mechanical equipment sealing product in the industry.
Stainless Steel Shell Oil Seal
The function of the skeleton oil seal is generally to isolate the parts that need to be lubricated in the transmission parts from the output parts, so as not to allow the leakage of lubricating oil. The skeleton is like the steel bars in the concrete member, which acts as a reinforcement and enables the oil seal to maintain its shape and tension. According to the skeleton type, it can be divided into inner skeleton oil seal, outer skeleton oil seal, and inner and outer skeleton oil seal. The skeleton oil seal is made of high-quality nitrile rubber and steel plate, with stable quality and long service life. Widely used in automobiles, motorcycle crankshafts, camshafts, differentials, shock absorbers, engines, axles, front and rear wheels and other parts.
The function of the skeleton oil seal is generally to isolate the parts that need to be lubricated in the transmission parts from the output parts, so as not to allow the leakage of lubricating oil. The skeleton is like the steel bars in the concrete member, which acts as a reinforcement and enables the oil seal to maintain its shape and tension. According to the skeleton type, it can be divided into inner skeleton oil seal, outer skeleton oil seal, and inner and outer skeleton oil seal. The skeleton oil seal is made of high-quality nitrile rubber and steel plate, with stable quality and long service life. Widely used in automobiles, motorcycle crankshafts, camshafts, differentials, shock absorbers, engines, axles, front and rear wheels and other parts.
NBR nitrile rubber skeleton oil seal
The function of the skeleton oil seal is generally to isolate the parts that need to be lubricated in the transmission parts from the output parts, so as not to allow the leakage of lubricating oil. The skeleton is like the steel bars in the concrete member, which acts as a reinforcement and enables the oil seal to maintain its shape and tension. According to the skeleton type, it can be divided into inner skeleton oil seal, outer skeleton oil seal, and inner and outer skeleton oil seal. The skeleton oil seal is made of high-quality nitrile rubber and steel plate, with stable quality and long service life. Widely used in automobiles, motorcycle crankshafts, camshafts, differentials, shock absorbers, engines, axles, front and rear wheels and other parts.
FKM fluorine rubber skeleton oil seal
The function of the skeleton oil seal is generally to isolate the parts that need to be lubricated in the transmission parts from the output parts, so as not to allow the leakage of lubricating oil. The skeleton is like the steel bars in the concrete member, which acts as a reinforcement and enables the oil seal to maintain its shape and tension. According to the skeleton type, it can be divided into inner skeleton oil seal, outer skeleton oil seal, and inner and outer skeleton oil seal. The skeleton oil seal is made of high-quality nitrile rubber and steel plate, with stable quality and long service life. Widely used in automobiles, motorcycle crankshafts, camshafts, differentials, shock absorbers, engines, axles, front and rear wheels and other parts.
Spring Seal/ spring energized seal/ Variseal is a U-shaped Teflon high-performance seal with a special spring inside. By the appropriate spring force plus the system fluid pressure, the sealing lip (surface) is pushed out. Gently press down on the metal surface being sealed to create a very good seal. The actuation effect of the spring can overcome the slight eccentricity of the metal mating surface and the wear of the sealing lip, while maintaining the expected sealing performance.
PTFE gaskets are also called PTFE gaskets or Teflon (Teflon) gaskets abroad. Flat gaskets, V-shaped gaskets, piston rings are machined or cut from PTFE rods, tubes, and plates. , ball valve gaskets, etc. have good characteristics such as corrosion resistance, aging resistance and non-conductivity. PTFE pH 0-14 (except molten alkali metals and fluorine at high temperature and high pressure). It can have good mechanical strength between -100°C and 100°C. Use pressure 10Mpa. At temperatures below -185°C, PTFE gaskets become brittle. Pure PTFE gaskets are a clean sealing product that will not contaminate anything they come in contact with.
The PTFE composite gasket is made of high-grade EPDM EPDM rubber body, and a 100% pure PTFE shell that has been specially activated at its effective sealing part is compounded.
Metal spiral wound gaskets are made of high-quality SUS304, SUS316 ("V" shape or "W" shape) metal strips and other alloy materials and graphite, asbestos, PTFE, non-asbestos and other soft materials alternately overlapped and spirally wound. The metal strips are fixed by spot welding at the beginning and end. Metal spiral wound gasket is the gasket with the best resilience among semi-metal gaskets
The octagonal metal ring gasket is installed in the trapezoidal ring groove on the flange surface. When the connecting bolt is tightened, it is axially compressed and tightly attached to the upper and lower trapezoidal grooves, resulting in plastic deformation, forming an annular sealing band and establishing the initial seal. After boosting, under the action of medium pressure, the ring gasket is radially expanded. The gasket and the inclined surface of the trapezoidal groove are more tightly fitted, resulting in a self-tightening effect. However, the increase of the medium pressure will also deform the flange and the connecting bolt, resulting in the relative separation between the sealing surfaces and the relative decrease in the gasket sealing ratio. Therefore, the ring gasket can be considered as a semi-self-tightening seal. The octagonal metal ring gasket is mainly in surface contact with the flange groove. Compared with the oval ring gasket, although it is not easy to achieve close contact with the flange groove, it can be used again and is easy to process because the cross section is composed of straight lines. At the same time, the hardness of the octagonal metal ring gasket should be 15~20HB lower than the flange surface.
Nitrile-butadiene rubber is a synthetic rubber suitable for good corrosion resistance to oils, solvents, aromatic hydrocarbons, basic hydrocarbons, oil and natural gas over a wide temperature range. Good corrosion resistance to hydroxides, salts and near neutral acids. However, in strong oxidizing media, chlorinated hydrocarbons, ketones and lipids, its corrosion resistance is poor, and the recommended working temperature is 51℃~121℃.
Fluoroelastomer has a high degree of chemical stability and is one of the medium-resistant properties of all elastomers at present. Type 26 fluororubber is resistant to petroleum-based oils, diester oils, silicone ether oils, silicic acid oils, inorganic acids, most organic and inorganic solvents, pharmaceuticals, etc., only low molecular weight ketones, ethers, Ester, not resistant to amine, ammonia, hydrofluoric acid phosphoric acid hydraulic oil. The dielectric properties of type 23 fluorine rubber are similar to those of type 26, and it is more unique. Its resistance to strong oxidizing inorganic acids such as fuming nitric acid and concentrated sulfuric acid is better than that of type 26. It is immersed in 98% HNO3 at room temperature. Its volume expansion is only 13% to 15%.
EPDM rubber is a copolymer of ethylene, propylene and a small amount of non-conjugated diene. It only contains unsaturated double bonds in the side chain, so it has excellent aging resistance such as ozone resistance, heat resistance and weather resistance. , automotive seals and other fields.
The plate heat exchanger is a new type of high-efficiency heat exchanger made of a series of metal sheets with a certain corrugated shape. Thin rectangular channels are formed between various plates, and heat is exchanged through the plates. Plate heat exchanger is an ideal equipment for heat exchange of liquid-liquid, liquid-vapor. It has the characteristics of high heat exchange efficiency, small heat loss, compact and lightweight structure, small footprint, convenient installation and cleaning, wide application and long service life. Under the same pressure loss, the heat transfer coefficient is 3-5 times higher than that of the tubular heat exchanger, the floor area is one third of that of the tubular heat exchanger, and the heat recovery rate can be as high as 90% or more. There are three main types of plates: herringbone corrugated plate, horizontal straight corrugated plate and tumor-shaped plate.
It has good weather resistance, odor resistance, water resistance and chemical resistance. It is suitable for alcohols and ketones, and can also be used for sealing in high temperature water vapor environment. It is suitable for sanitary equipment, automobile radiator and automobile braking system. Not suitable for food use or exposure to mineral oil. The general operating temperature range is -55℃~150℃.
The volume of the O-ring being squeezed into the gap should be less than the maximum allowable value for the rubber ring to be squeezed into. For different kinds of fixed sealing or dynamic sealing applications, O-ring provides designers with an effective and economical sealing element. The o-ring is a double-acting sealing element. The initial compression in radial or axial aspects upon installation, imparts the initial sealing capability of the o-ring itself. The sealing force generated by the system pressure and the initial sealing force are combined into the total sealing force, which increases with the increase of the system pressure. O-rings play a prominent role in static sealing occasions. However, o-rings are also often used in dynamic appropriate applications, but are limited by the speed and pressure at the seal.
The volume of the O-ring being squeezed into the gap should be less than the maximum allowable value for the rubber ring to be squeezed into. For different kinds of fixed sealing or dynamic sealing applications, O-ring provides designers with an effective and economical sealing element. The o-ring is a double-acting sealing element. The initial compression in radial or axial aspects upon installation, imparts the initial sealing capability of the o-ring itself. The sealing force generated by the system pressure and the initial sealing force are combined into the total sealing force, which increases with the increase of the system pressure. O-rings play a prominent role in static sealing occasions. However, o-rings are also often used in dynamic appropriate applications, but are limited by the speed and pressure at the seal.
The O-ring is a circular rubber ring with a circular cross-section. It is mainly used for mechanical parts to prevent leakage of liquid and gaseous media under static conditions. In some cases, it can also be used for axial reciprocation and low-speed rotation. Moving dynamic sealing element. According to different conditions, different materials can be selected to suit it.
O-rings are the most widely used seals in hydraulic and pneumatic transmission systems. Generally, O-rings are rarely used in rotary motion sealing devices. The O-ring is generally installed in the groove with a rectangular cross-section on the outer or inner circle to play a sealing role.
Nitrile-butadiene rubber is a synthetic rubber suitable for good corrosion resistance to oils, solvents, aromatic hydrocarbons, basic hydrocarbons, oil and natural gas over a wide temperature range. Good corrosion resistance to hydroxides, salts and near neutral acids. However, in strong oxidizing media, chlorinated hydrocarbons, ketones and lipids, its corrosion resistance is poor, and the recommended working temperature is 51℃~121℃.
Fluorine rubber compound is made by mixing binary and ternary fluorine raw rubber with compounding agent and vulcanizing agent. In addition to excellent heat resistance, medium resistance, and good physical and mechanical properties, it also has low compression set, good elasticity and long service life. Fluorine rubber has outstanding heat resistance (200 ~ 250 ℃), oil resistance, can be used to manufacture cylinder liner seals, rubber bowls and rotating lip seals, which can significantly improve the service time. Recommended working temperature -40℃~232℃.
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