German servrovalve seals servrovalve models servrovalve prices

servrovalve seals are devices that prevent fluid leakage, consisting of at least one pair of end faces perpendicular to the axis of rotation. These faces remain in contact and slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, along with the assistance of auxiliary seals. Mechanical seals where the elastic loading mechanism and auxiliary seal are metal bellows are referred to as metal bellows seals. In light-duty seals, rubber bellows are also used as auxiliary seals; since the elastic force of rubber bellows is limited, springs are generally required to supplement the loading force. Mechanical seals are commonly abbreviated as "mechanical seals".

servrovalve seal classification

Oil seals are generally classified into single-piece and assembled types. Assembled types allow free combination of the cage and lip material, and are generally used for special oil seals. Based on sealing function, characteristics, structural type, operating state, and sealing mechanism, oil seals can be divided into various forms with different names. However, by convention, rotating shaft lip seals are called oil seals, while seals for static and dynamic (generally reciprocating) applications are called seals. The representative form of an oil seal is the TC oil seal, which is a double-lip oil seal with a self-tightening spring fully encapsulated in rubber. The term oil seal commonly refers to this type of tc caged oil seal.

servrovalve seal materials

Common materials for oil seals include: nitrile rubber, fluorocarbon rubber, silicone rubber, acrylic rubber, polyurethane, and polytetrafluoroethylene. 1) Nitrile rubber (NBR): It has good heat and wear resistance, and is resistant to various lubricating oils, greases, and oil-gas mixtures. The applicable temperature range is -30 to 120 degrees Celsius. However, it cannot be used in phosphate ester hydraulic fluids or gear oils containing extreme pressure additives. It performs stably in gasoline and mineral oils with low aniline points. 2) Polyacrylate rubber (ACM): It has superior oil and heat resistance, wear resistance, ozone resistance, and UV radiation resistance. It is especially resistant to lubricating oils, gear oils, motor oils, engine oils, and petroleum-based hydraulic fluids containing extreme pressure agents. It is suitable for operation in the range of -30 to 150 degrees Celsius. 3) Fluorocarbon rubber: It offers aging, heat, and oil resistance, and is suitable for almost all lubricating oils, fuel oils, and gasoline. It does not harden easily in oils containing extreme pressure additives. However, it has poor cold resistance and high-temperature wear resistance, and exhibits significant permanent compression set. It is suitable for temperatures from -20 to 250 degrees Celsius. 4) Silicone rubber: It has outstanding high and low-temperature resistance. It can be used long-term at 150 degrees Celsius without performance change; it can be used continuously at 200 for 10000h. It maintains its unique elasticity, ozone resistance, and weather resistance within the operating temperature range of -70 to 260. 5) Polytetrafluoroethylene: It has outstanding chemical stability, thermal stability, friction reduction, and self-lubrication properties, with a decomposition temperature above 400. Therefore, it can operate normally in the temperature range of -200 to 300 degrees Celsius. Except for free fluorine and alkali metals, it has excellent corrosion resistance to chemicals, solvents, hydroxides, and acids. Nitrile rubber and fluorocarbon rubber are widely used oil seal materials. The former is low-cost, while the latter offers significant improvements in temperature resistance and sealing performance but is more expensive. It still retains some common disadvantages of ordinary rubber materials, such as poor wear resistance, short service life, and high sensitivity to shaft eccentricity, so leakage phenomena remain relatively common. PTFE oil seals are high-tech products and represent the future direction of oil seal development [2]. When selecting oil seal materials, compatibility with the working medium, adaptability to the operating temperature range, and the lip's ability to follow the rotating shaft at high speeds must be considered. Generally, the lip temperature of an oil seal during operation is 20 to 50℃ higher than the working medium temperature, which should be noted when selecting materials. The operating range of an oil seal depends on the material used: for nitrile rubber (NBR), it is -40 to 120℃; for acrylic rubber (ACM), it is -30 to 180℃; for fluorocarbon rubber (FPM), it is -25 to 300℃.

servrovalve seal precautions

1) Before designing grooves, please carefully read the product descriptions for each series to distinguish whether the product uses an integral groove or a split groove. During the installation of seals, avoid sharp edges. Seals for bore applications must be installed into integral grooves using installation tools. Designers must consider parameters such as groove dimensional accuracy, surface roughness, and extrusion gap. Please refer to the product instructions, diagrams, and dimension tables for details. 2) Before installing seals, ensure that there are no impurities or cracks in the sealing groove. Apply assembly oil to both the sealing groove and the seal surface. Install the seals gradually in sequence. Avoid sharp edges during installation, align the seal properly, and avoid twisting or tilting. If using a split groove, tighten the pressure cover last.

Weidou Intelligent Technology specializes in the sale of German servrovalve seals, servrovalve sealing rings, servrovalve sealing strips, servrovalve pipe seals, servrovalve cable seals, servrovalve rubber seals, servrovalve mechanical seals, servrovalve gaskets, servrovalve oil seals, servrovalve shaft seals, servrovalve metal seals, servrovalve high-pressure seals, servrovalve spiral seals, servrovalve centrifugal seals, servrovalve sealing rings. servrovalve original imports from Germany. Welcome customers to inquire and order.