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Commonly used sealing engineering plastics1. Polytetrafluoroethylene (PTFE) and its filling modificationThe melting point of PTFE is 327 °C, the density is 2.18～2.3g/cm3, the Shore hardness is D50～65, and it has excellent chemical stability and self-lubrication. Has excellent comprehensive properties, such as: high and low temperature resistance, corrosion resistance, aging resistance, non-adhesion, high insulation, high lubrication, non-toxic. However, PTFE has poor creep resistance, poor wear resistance, and large expansion coefficient of products, so it is usually necessary to overcome these shortcomings by filling and modification. Commonly used fillers are copper powder, carbon fiber, glass fiber, graphite, molybdenum disulfide, polyphenylester, polyether ether ketone, etc. One or more substances can be filled according to different working conditions and uses1. Pure PTFE productsPure PTFE can process seals such as retaining rings and gaskets. It has the characteristics of high temperature resistance, corrosion resistance and self-lubrication. However, it is prone to creep under load and causes leakage. It is usually used in the food, pharmaceutical and chemical industries.2. PTFE filled copper powder modified productsCopper powder is the most commonly used filler for PTFE. The PTFE seals modified by filling with copper powder have great improvements in compression resistance, wear resistance, thermal conductivity and creep resistance. According to different performance requirements, different copper powder composition, particle size and filling ratio can be selected to make its performance meet the actual needs. This product is usually used to make wear-resistant guide rings, wear-resistant belts, oil/cylinder seals, etc. Copper powder may be corroded in strong acid environment, so it is not recommended to use in strong acid service.3. PTFE filled carbon fiber modified productsThe modified polytetrafluoroethylene seals filled with carbon fibers have great improvements in compression resistance, wear resistance, creep resistance and tensile strength, and at the same time increase the hardness of the products, which are suitable for rotary seals. It is used in the production of spring energy storage plug seals, automobile gearbox oil rings, etc. Carbon fiber may be oxidized and decomposed in strong acid environment, so it is not recommended for use in strong acid conditions.4. PTFE filled glass fiber modified productsThe modified PTFE seals filled with glass fibers have great improvements in compression resistance, wear resistance, creep resistance and tensile strength, and at the same time increase the hardness of the products, suitable for rotary seals, usually It is used to make gaskets, spring energy storage plug seals, automobile gearbox oil rings, etc. Glass fibers may decompose in alkaline environments and are therefore not recommended for use in alkaline or water-containing applications. Foshan Damanson Seald5. PTFE-filled graphite or molybdenum disulfide modified productsThe main purpose of filling graphite or molybdenum disulfide modification is to improve the compression resistance, wear resistance and creep resistance of PTFE seals while maintaining the low friction coefficient and self-lubrication of PTFE to a large extent. Features. It is usually filled in combination with other fillers, or it can be filled alone. It is mainly used to make spring-energy storage pan plug seals, cylinder seals, self-lubricating shaft sleeves, etc. It is suitable for working conditions requiring low friction coefficient or inconvenient to add lubricant.6. Polytetrafluoroethylene filled polyphenylester or polyether ether ketone modified productsThe PTFE seals modified by filled polyphenylester or polyetheretherketone have great improvement in compression resistance, wear resistance, creep resistance and high temperature resistance, especially in high temperature environment. Toughness and hardness have been greatly improved. Suitable for static seals, dynamic seals and compressor self-lubricating piston rings for long-term operation in high temperature environments.2. Polychlorotrifluoroethylene (PCTFE)The melting point of polychlorotrifluoroethylene is 210～230°C, the density is 2.1～2.18g/cm3, and the Shore hardness is D75～D90. Polychlorotrifluoroethylene has excellent rigidity and corrosion resistance, and its mechanical properties at room temperature are better than that of polytetrafluoroethylene. It has high compressive strength and small creep. Under the low temperature environment, the compression rebound rate is large, and it has good elastic recovery force. It still maintains a certain elasticity at -265°C. It is one of the known polymer materials with excellent ultra-low temperature comprehensive performance. Polychlorotrifluoroethylene is a crystalline polymer, so its mechanical properties are greatly affected by temperature, and there are certain differences due to the degree of crystallinity and molecular weight. Its tensile strength and hardness will follow the advancement of crystallization. increase, but the elongation will decrease. The grades with large molecular weights are usually formed by molding and cannot be formed by extrusion due to poor melt fluidity. Polychlorotrifluoroethylene is an ideal sealing material under low temperature and high pressure conditions, and can be used for a long time in the range of -200 to 125°C. Polychlorotrifluoroethylene seals have special uses in high-tech fields, and are recommended for use in tube pumps, valves and joints in ultra-low temperature conditions such as liquid oxygen, liquid nitrogen, and liquefied natural gas.3. Ultra-high molecular weight polyethylene (UHMWPE)The melting point of high molecular weight polyethylene is 130～136°C, the density is 0.94g/cm3, and the Shore hardness is D40～D60. It combines the superior properties of almost all plastic materials: impact resistance, wear resistance, chemical corrosion resistance, low friction coefficient, good self-lubricating properties, and still has excellent mechanical properties in ultra-low temperature environments, -70°C is still very good. High impact performance, still maintains toughness and strength at -196°C, hardly absorbs water and does not swell, has better wear resistance and creep resistance than PTFE materials, and is proved to be wear-resistant by mortar wear test The resistance can reach 6.6 times that of ordinary carbon steel. Ultra-high molecular weight polyethylene with a molecular weight of less than 5 million can be extruded after technical treatment, and can only be molded with a molecular weight of more than 5 million. The long-term operating temperature range of UHMWPE seals is -180°C to 70°C. It is recommended for conditions with high sliding performance requirements or poor lubrication, high wear resistance requirements, or water-containing media and dry friction prone conditions. It is also commonly used for sealing in ultra-low temperature environments. Its disadvantages are insufficient tensile strength, poor high temperature resistance, low hardness, and low thermal conductivity. Foshan Damanson Seal4. Polyetheretherketone (PEEK)The melting point of polyetheretherketone is 334°C, the density is 1.265～1.32g/cm3, the Shore hardness is D82～D90, and the tensile strength is higher than 92MPa. Polyetheretherketone is a special polymer material with high mechanical strength, high temperature resistance, impact resistance, flame retardant, acid and alkali resistance, hydrolysis resistance, wear resistance, fatigue resistance, radiation resistance and good electrical insulation properties. Polyetheretherketone resin has good high temperature performance and high melting point. The continuous use temperature can reach 260°C, and the load heat deflection temperature after adding glass fiber or carbon fiber is up to 316°C. Polyetheretherketone resin has good toughness and rigidity, and it has excellent fatigue resistance to alternating stress comparable to alloy materials. Due to its excellent high temperature resistance, self-lubrication, wear resistance and fatigue resistance, it has become one of the most popular high-performance engineering plastics today. It is mainly used in aerospace, automotive industry, electrical and electronic and medical equipment and other fields. Because of its good mechanical properties, high temperature resistance, wear resistance and high pressure resistance, polyether ether ketone is often used to manufacture compressor valve plates, piston rings, high temperature seals, sliding bearings, etc.Commonly used sealing rubber1. Nitrile rubber (NBR)Nitrile rubber is a synthetic rubber produced by low temperature emulsion polymerization of butadiene and acrylonitrile. It has excellent oil resistance, high wear resistance, water resistance, air tightness and excellent bonding properties. The operating temperature range of nitrile rubber is -30°C to 100°C, and the service life will decrease when used at 120°C. It is widely used in the production of various oil-resistant rubber products, O-rings, gaskets, casings, cable rubber materials, etc. It is also an essential elastic material in the automotive, aviation, petroleum and other industries. The disadvantages of nitrile rubber are poor low temperature resistance, poor ozone resistance, poor insulation performance, and slightly lower elasticity.2. Fluorine rubber (FKM/FPM)Fluorine rubber is a synthetic rubber containing fluorine atoms. It has the characteristics of high temperature resistance, oil resistance, medium resistance and resistance to various chemicals. At the same time, it has a high degree of chemical stability. Its operating temperature range is -20°C～200°C, and when used for dynamic sealing, the low temperature resistance range is -20°C～-15°C. Mainly used to make oil seals, O-rings, gaskets, fluororubber strips, fluororubber plates, sealing rings, etc. The disadvantage of fluororubber is that it has poor low temperature resistance and high density.Three, ethylene propylene diene rubber (EPDM)EPDM rubber is a terpolymer of ethylene, propylene and non-conjugated dienes. Its main polymer chain is completely saturated, this feature makes EPDM rubber resistant to heat, light, oxygen, especially ozone, so it has very good aging resistance, good weather resistance, excellent electrical insulation properties, and resistance to It has the characteristics of good chemical corrosion and good impact elasticity. It is mainly used in the fields that require aging resistance, water resistance, corrosion resistance, electrical insulation and other fields to make heat-resistant conveyor belts, cables, anti-corrosion linings, sealing gaskets, door and window sealing strips, plastic modification, etc.

Everyone should have heard of the pan plug seal, which is a sealing part with excellent use effect. Today, the editor of Damonson will share with you the relevant knowledge of Pan-Seal. Do you know what are the characteristics of the use of the pan-plug seal? What are the components of the pan-plug seal? The following is an introduction to "the description of the use of the pan-plug seal and the detailed introduction of the components.【Composition and application characteristics of pan-plug seal】Pan plug seal (full name: Pan plug spring tension energy storage support seal, also known as spring tension seal, spring energy storage seal) is a seal made of polytetrafluoroethylene or other high-performance materials with special springs built in. The force plus the system fluid pressure pushes the sealing lip (face) out and lightly presses the sealed metal face to produce a very good sealing effect. 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. It can be used for oil, water, steam, air, solvent, medicine, food, acid and alkali, chemical solution, etc.PTFE is the main material of the pan-plug sealing body, its chemical resistance is better than that of perfluororubber, and it is a sealing material with good heat resistance. It can be used in most chemical fluids, solvents, hydraulic oils and lubricating oils. Its expansion is small, so it can exert sealing performance for a long time. Various special springs are used to overcome the elasticity of Teflon or other high-performance rubber and plastics. Problems, developed to replace the vast majority of seals used in static or dynamic (reciprocating or rotary motion). The description of the use characteristics of the pan-plug ring and the detailed introduction of the components. Reasonable shell materials and support springs plus professional sealing design can make the temperature range of the pan-plug seal reach -200°C to 260°C, and the pressure can be from vacuum to ultra-high pressure. 200Mpa, the line speed is as high as 15m/s, so it can be used in various high and low temperature corrosive fluids and other occasions.The pan plug seal can be made according to the AS568A standard O-ring groove (such as radial shaft seal, piston seal, axial face seal, etc.), completely replacing the general O-ring, or our company can provide a reasonable groove design. Due to the lack of expansion, the pan-plug seal can maintain good sealing performance for a long time. For example, for mechanical shaft seals used in high-temperature corrosive environments in petrochemical processes, in addition to uneven wear of the sliding ring, the common cause of leakage is the deteriorating cracking damage of the O-ring. , surface roughening, wear and other problems, thus greatly improving the service life of the mechanical shaft seal. In addition to the above-mentioned sealing applications in high temperature and corrosive environments, because of its low friction coefficient of sealing lip, stable sealing contact pressure, high pressure resistance, large radial runout and groove size error, Therefore, it is very suitable for sealing parts of air-hydraulic cylinders, replacing U-shaped or V-shaped tightening to obtain excellent sealing performance and service life.Product features: The sealing performance is not affected by insufficient lubrication during startup, effectively reducing wear and frictional resistance. Through the combination of different sealing materials and springs, different sealing forces can be exhibited to meet various application requirements. It is processed by dieless CNC and has high dimensional progress, especially suitable for large quantities and various seals. The chemical corrosion resistance and heat resistance are far superior to the commonly used rubber seals, the dimensions are stable, and there is no problem of deterioration of the sealing performance caused by volume expansion or shrinkage. Compact structure, can be installed in standard O-ring groove. Because the sealing material is polytetrafluoroethylene or other high-performance materials, it is very clean, does not pollute, and has a very low friction coefficient, even in very low-speed applications, and there is no stagnation effect. Low starting friction resistance, even if the shutdown time is long or intermittent operation, it can maintain low starting power performance.The main application of the pan plug seal:The pan-plug seal is a special seal developed for the application environment of high temperature corrosion, difficult lubrication and low friction. The combination of different Teflon composite materials, engineering plastics and corrosion-resistant metal springs can fully meet the increasingly stringent industrial requirements. Diversity requirements, typical applications are as follows:1. Axial seals for rotary joints of loading and unloading arms2. Paint valve parts or seals for other paint systems3. Seals for vacuum pumps4. Beverage, water, beer filling equipment (such as filling valve) and seals for food industry5. Seals for traditional industries of automobile, aerospace, chemical industry and petroleum6. Seals for metering equipment (low friction, long life)7. Seals for other equipment or pressure vessels (liquefied gas)Sealing principle:Teflon or other high-performance materials combined with appropriate spring, spring tension plus system fluid pressure, push the sealing lip out and lightly press the sealed metal surface to form a very good sealing effect. Oil, water, steam, air, solvent, medicine, food, acid and alkali, chemical solution, etc.【Meaning and application characteristics of pan-plug seal】Spring Seal is a kind of U-shaped Teflon high-performance seal with special spring inside, and the sealing lip (surface) is pushed out by appropriate spring force plus system fluid pressure. And lightly press the sealed metal surface to generate a very good sealing effect. The actuation effect of the spring can overcome the slight eccentricity of the metal mating surface and the wear of the sealing lip, and the flooded seal is more durable to maintain the expected sealing performance. The working conditions of the equipment are different between the step seal and the pan plug seal, and the pan plug seal is suitable for some environmental conditions with high product requirements. The special seals and pan-plug seals made by Dongsheng Seal and Youquan Seal are better.Features1. The sealing performance is not affected by insufficient lubrication at start-up2. Effectively reduce wear and friction resistance3. Through the combination of different sealing materials and springs, different sealing forces can be displayed to meet various application requirements. It is made by CNC machining machine without mold cost - especially suitable for a small amount of various seals.4. The chemical corrosion resistance and heat resistance are far superior to the commonly used seal rubbers, the dimensions are stable, and there is no deterioration of the sealing performance caused by volume expansion or shrinkage.question1. Compact structure, can be installed in standard O-ring groove2. Significant lifting capacity and service life3. The groove of the seal can be filled with any anti-pollution material (such as silicone) - but not suitable for radiation environments4. Because the sealing material is Teflon, it is very clean, will not pollute the process, and the friction coefficient is extremely low5. Very, no "slip effect"6. Low starting friction resistance, even if the shutdown time is long or intermittent operation, it can maintain low starting power performance.The above descriptions of "components and application characteristics of pan-plug seals" and "meaning and application characteristics of pan-plug seals" hope to help you understand "the description of the use characteristics of pan-plug seals and the detailed introduction of components".

   It is suitable for valves suitable for medium temperature -40℃～-196℃. It is called low temperature valve. Low temperature valve includes low temperature ball valve, low temperature gate valve, low temperature globe valve, low temperature safety valve, low temperature check valve, low temperature butterfly valve, low temperature needle valve, low temperature valve Throttle valve, low temperature pressure reducing valve, etc., mainly used in ethylene, liquefied natural gas plant, natural gas LPG LNG storage tank, receiving base and satellite station, air separation equipment, petrochemical tail gas separation equipment, liquid oxygen, liquid nitrogen, liquid argon, Carbon dioxide low-temperature storage tanks and tankers, pressure swing adsorption oxygen production and other devices. The output liquid low-temperature medium, such as ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas, liquefied petroleum products, etc., is not only flammable and explosive, but also needs to be gasified when heated up, and its volume expands hundreds of times when gasified.    The material of liquefied natural gas valve is very important. If the material is not qualified, it will cause external leakage or internal leakage of the casing and sealing surface; the comprehensive mechanical properties, strength and rigidity of the parts cannot meet the requirements of use or even break. Leakage of liquefied natural gas medium causes explosion. Therefore, in the process of developing, designing and developing LNG valves, the material is the primary and key issue. After many years of manufacturing, it has accumulated rich experience, and has become more and more mature from design, technology to manufacturing, and has developed a series of low-temperature valve products.1. Product specifications and design parameters of cryogenic valves:1. Pressure rating: 150, 300, 600Lb, 900LB, 1500LB (45MPa)2. Valve diameter: 15～1200 mm (1/2～48").3. Connection form: flange type, welding type, thread.4. Valve material: LCB, LC3, CF8.5. Working temperature: -46°C, -101°C, -196°C, -253°C6. Applicable medium: LNG, ethylene, propylene, etc.7. Drive mode: manual, bevel gear drive, electric.2. Low temperature valve standard and product structure:1. Design: API6D, JB/T77492. Valve routine inspection and test: according to API598 standard.3. Valve low temperature inspection and test: according to JB/T7749.4. Drive mode: manual, bevel gear drive and electric drive.5. Valve seat form: The valve seat adopts a welded structure, and the sealing surface is surfacing with cobalt-based hard alloy to ensure the sealing performance of the valve.6. The gate adopts an elastic structure, and a pressure relief hole is designed at the pressure inlet end.7. The valve body with one-way seal is marked with the flow direction mark.8. Low temperature ball valve, gate valve, globe valve, butterfly valve adopt long neck structure to protect packing.9. Ultra-low temperature ball valve standard: JB/T8861-20043.low temperature valve material selection:1. Valve body and bonnet adopt: LCB(-46℃), LC3(-101℃), CF8(304)(-196℃)2. Gate: stainless steel surfacing cobalt-based cemented carbide3. Seat: stainless steel surfacing cobalt-based carbide4. Stem: 0Cr18Ni94. Manufacturing and testing of cryogenic valves:   Maezawa has formulated strict manufacturing processes and special equipment for the cryogenic valves produced, and carries out strict quality control on the processing of parts. After special low temperature treatment, the rough machined parts are placed in the cooling medium for several hours (2-6 hours) to release the stress, ensure the low temperature performance of the material, and ensure the finishing size to prevent the valve from being damaged due to low temperature conditions. Leaks caused by deformation due to temperature changes. The assembly of the valve is also different from that of ordinary valves, and the parts need to be strictly cleaned to remove any oil stains to ensure the performance.5. Low temperature valve test equipment:1. Low temperature valve test device2. Liquid nitrogen storage device3. Low temperature treatment tank4. Low temperature test bench to ensure the performance of the valve under low temperature conditions 5. Others6. Low temperature valve test and inspection: The main parts of the low temperature valve are treated at low temperature and each batch is sampled for low temperature impact test to ensure that the valve is not brittle under low temperature conditions and can withstand the impact of low temperature media.The following tests are performed on each valve:1. Normal temperature shell strength test;2. Normal temperature and low pressure upper sealing test;3. Normal temperature and low pressure sealing test;4. Low temperature upper sealing air tightness test (when there is upper sealing);5. Low-temperature gas sealing test, etc., to ensure that the entire low-temperature valve meets the requirements of the standard;6. The main parts of the low-temperature valve are treated at low temperature and each batch is sampled for low-temperature impact test to ensure that the valve is not brittle under low temperature conditions and can withstand the impact of low-temperature media;  Other parameters of cryogenic valve:  The valve body is light and small in size. In order to reduce the heat loss of the valve body, especially to ensure the use of the valve under ultra-low temperature, the valve body is specially designed to be light in weight and small in size.The long-shaft valve has a valve through which low-temperature fluid flows, and adopts the form of a long valve stem, which can avoid the effect of external heat and keep the gland at normal temperature to prevent the performance of the cover seal from being degraded. This length is obtained by calculation and experimentation.    Ideal valve seat soft sealing structure: In SW and BW forms, the valve body cannot be removed from the piping, in order not to replace the valve body valve seat, a soft contact valve seat is used. The valve core seal is made of Teflon or Teflon containing 15% glass fiber with good low-temperature characteristics and stability, and can also be replaced according to needs. Hard metal seal structure: metal seals are used on gate valves and valves with fire protection requirements. It is to add a stellite metal bushing to the contact surface of the valve seat to improve the surface hardness and improve the anti-burn and wear resistance.   The gasification and boosting structure gate valve adopts a flexible structure and is completely sealed. Therefore, at this time, the liquefied gas inside the valve body is sealed, and when the temperature rises after absorbing external heat, the phenomenon of regasification will occur, causing the internal pressure of the valve to rise. In order to prevent this phenomenon, a structure in which a decompression hole is opened in the valve body is adopted. The gland packing with excellent durability adopts Nanchang Teflon ring packing with good durability in the gland part. This packing has self-pressure sealing properties depending on the internal pressure, so it can be easily controlled with a small tightening torque. And the friction is small, so the operation is easy.   Gasket Gasket is made of Teflon material containing ceramic filler material with stable sealing performance. In addition, a gasket with a scroll-shaped metal surface is also used, which has frequent switching at normal temperature and low temperature and sealing stability against temperature changes.

1. performance and useIt is suitable for one-way sealing of hydraulic reciprocating piston rod, and has good sealing performance at high, medium and low pressure.The working pressure is suitable for a wide range, and can be used for high pressure and ultra-high pressure sealing. Can be installed in series in the same direction to increase theIncrease pressure capacity.Small friction coefficient, can work with or without lubrication, wear resistance and long life.The working medium of the sealing sleeve has a wide range of adaptability.Wide operating temperature range, can be used for -30 ° C ~ +160 ° C (depending on the O-ring).It can be used in special working conditions such as very high speed, very low speed and micro-travel.The grooves are open.The biggest feature is that the leakage is small and the service life is long.2.materialGland: Filled with polytetrafluoroethylene (PTFE). According to different working conditions and sealing requirements, you can choose differentFilling material and filling process, please inquire for details.O-ring: NBR or FKM, according to the specific working conditions, the default is NBR, for special working conditions, please inquire and explain before ordering.