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Factors to consider when using FDA food grade stainless steel nitrile rubber O-rings

by:ORK      2022-11-21
In the application of O-rings, the actual working conditions and application standards must be considered. Temperature and working pressure will both cause the effectiveness and wear of the O-ring seal. When the YXUV type ring is used to rotate the fitness sports seal, it is only for low-speed rotary seal equipment. The sealing ring is generally installed in the pipe groove with a rectangular frame on the outer circle or the inner and outer circles to play a sealing effect. The sealing ring still has excellent sealing and shock-absorbing effects in natural environments such as acid and alkali resistance, strong acid and alkali resistance, grinding, and organic chemical corrosion. Therefore, the following 5 points must be considered in the application of O-type rubber seals: 1. Substances in work (chemical substances that play a decision-making role) and standards in work; 2. Commodities and substances in work (decision-making substances) The compatibility of the effective chemical substances), and then considering the working pressure, temperature, continuous working time, operation cycle time and other standards at the seal, the application in the rotating place must also take into account the heat caused by friction. 3. Sealing method: when the shaft seal is installed axially, the error between the inner diameter of the O-ring and the diameter to be sealed should be as small as possible; for the hole seal, the inner diameter should be equal to or slightly lower than the pipe groove (gōucáo) Diameter. The food-grade stainless steel sealing strip seals an item so that it is not easy to open. Sealing strips are made of rubber, paper, metal, plastic and other materials. When installing radially, it is also necessary to consider the pressure direction. When the internal working pressure is used, the diameter of the O-ring (edge ​​diameter) should be about 1%~2% larger than the diameter of the pipe groove (edge ​​diameter). When the diameter is working pressure, it should be The inner diameter of the O-ring is about 1% to 3% smaller than the pipe groove. 4. Other factors that affect the sealing performanceáo) Larger allowable extrusion gap; 2) Extrusion gap: the working pressure of the system software, the cross-sectional diameter of the O-ring and the strength of the raw material are related. The selection of sealing ring raw materials has key practical significance for its sealing performance and service life. The properties of the raw material immediately compromise the application properties of the seal. The most suitable and common raw material is rubber, so most of the sealing rings are made of rubber raw materials. There are many types of rubber, and new types of rubber seals continue to appear. When designing and adopting, you should master the characteristics of various rubbers and select them effectively. 3) Reduce permanent deformation: under the condition of working pressure, in order to avoid permanent plastic deformation. The rubber parts have high-quality sealing performance, long service life in operation, and long service life in dynamic working pressure sealing, and can have the same service life as the sealing base material under some standards. It is suitable for being installed on a variety of industrial equipment, under the required temperature, working pressure, and different liquid and gaseous substances, and has a sealing effect in a static or moving state. The maximum reduction allowed by the O-ring is about 30% for static seals and about 20% for dynamic seals. 4) Pre-shrinkage: In order to better ensure the groove of the O-ring (gōucáo) The sealing performance should be pre-buried with an original reduction amount, relative to the pre-reduction amount of the cross-sectional diameter, generally about 15%~30% in static sealing, and about 9%~25% in dynamic sealing. The rubber parts have high-quality sealing performance, long service life in operation, and long service life in dynamic working pressure sealing, and can have the same service life as the sealing base material under some standards. It is suitable for being installed on a variety of industrial equipment, under the required temperature, working pressure, and different liquid and gaseous substances, and has a sealing effect in a static or moving state. Food grade stainless steel O-ring O-ring (O ring manufactures) is a kind of rubber sealing ring with annular cross section. O ring manufactures are the most common mechanical design for sealing due to their low price, simple manufacturing, reliable function, and easy installation requirements. 5) Pulling and shrinking: For the hole seal, the O-ring is in the pulling state, and the maximum allowable pulling amount is 6%. For the shaft seal, the O-ring is reduced along the diameter direction, and the larger allowable diameter is reduced. The amount is 3%. 5. The O-ring is used for low-speed rotation and fitness movement and the rotating shaft seal with a short operating cycle time. When the speed on the circle is less than 0.5m/s, the selection of the O-ring can be based on all normal design specifications; when the speed on the circle exceeds 0.5m/s When the temperature is 0.5m/s, the condition of the rubber ring that becomes longer must be considered when it is heated, and the sealing ring should be selected so that the inner diameter is about 2% larger than that of the sealed journal. The food-grade stainless steel sealing strip seals an item so that it is not easy to open. Sealing strips are made of rubber, paper, metal, plastic and other materials. The selection of sealing ring raw materials has key practical significance for its sealing performance and service life. The properties of the raw material immediately compromise the application properties of the seal. The most suitable and common raw material is rubber, so most of the sealing rings are made of rubber raw materials. There are many types of rubber, and new types of rubber continue to appear. When designing and adopting, you should master the characteristics of various rubbers and select them effectively.
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