The design also includes a metal “lantern ring” installed between the rings of packing to allow for lubrication or flushing. One manufacturer supplies a spacer ring with a new shaft seal kit which, when installed, will move the shaft seal to a new location on the shaft. Inch: 05001000-250, SB2P2 = .0500" shaft, 1.000" bore, .0250" width SB2 style (single lip with spring), blue painted ODMetric: 10 x 20 x 7, TCR2 = 10mm shaft dia, 20mm bore dia., 7mm width, TC style,Nitrile material, Home | Linecard | Online-Store | Contact Us/Request Quote. Oil Seals are also known as a Radial Lip Seals, Shaft Seal, Elastomeric Lip Seal, Grease Seals, and Dust Seals our Rotary Shaft Seals help prevent lubricant leakage by retaining the fluid within the application while simultaneously protecting it from the intrusion of harmful external contaminants. When a vacuum pump is running constantly the oil seal elastomer will slowly harden due to the heat of the pump and after two or three years may start to leak. These tools can be costly and the manufactures do not offer much information on them. Nitrile shaft seals are used as oil seals and are designed to keep your equipment running smoothly. It was a very simple design and worked well. For many small and medium shaft size applications in the vacuum pump industry the mass produced “lip seal” is now the seal of choice. On any machine that has a rotating shaft there will be a shaft seal of one type or another. If the pump moves liquids, such as a centrifugal water pump, it is important that the seal doesn’t leak although in some applications a small amount of leakage can be tolerated. it doesn’t matter which way the shaft rotates. Common configurations include single lip, double lip, triple lip, and four or more lips. The size of seals ranges from 3 feet 3 inches for the Balkan seal to 16 feet for the southern elephant seal which ranks as the largest carnivoran. The minimum hardness on the area where the sealing lip contacts the shaft should be 45 HRC. The Different Types of Seals. Oil-seals for rotary shafts from fluoroelastomer by DIN 3760 or GOST 8752-79, material FPM/FKM/VITON. If the machine is a simple electric motor, for example, the seal may be used just to retain the lubricant in the bearings and to prevent dust and dirt from entering the bearing. The individual rings of packing are cut from a larger roll and on installation the joints are staggered from ring to ring to eliminate any direct leak path. Finally there are designations for material and an other design preferences. Seals are necessary when a shaft extends from a housing (enclosure) containing oil, such as a pump or a gear box. A bearded seal. Rotary shaft seals (aka oil seals) are commonly low pressure seals designed to seal between a rotating shaft and body to prevent the loss of lubricating fluids and prevent the ingress of dirt and other contaminates. F.ex., TCR2 is TC style, NBR material, the ‘R’ is a place holder, R & L are also used with helix designs. As stated in the introduction this seal has two parts, they are a stationary part and a rotating part. To seal water at low surface velocities, stainless steel is more suitable. The inner seal can be more difficult to service. The most significantdevelopment in the evolution of the radial lip seal happened toward the end of World War II. What is a shaft If the liquid being pumped is hydraulic fluid, it may be at high pressure and the seal would be designed to withstand that pressure without failing. Oil Seals or Shaft seals are an integral part in any rotating and moving part assembly. It is a simple device for excluding dust, dirt, water or any other contaminant whilst retaining lubricant in rotary shaft equipment. Shaft – the diameter of the shaft where the seal will operateBore – the diameter of the bore where the seal will operateWidth or Depth – Actual width of the seal, or if not specified, the depth of the boreStyle – Refer to catalog pagesLip Material- Material of sealing element, 70/75 durometer. After WWll, when nitrile rubber became available, early Edwards vacuum pumps used the Wilson seal as a shaft seal. This was the firstradial lip seal to be press fitinto an outside diameter (OD) bore. As can be seen from the seal cross-section shown in Fig. These are then followed by the style or type of design. This article describes what is an oil seal, types of oil seal materials, lip seals, shaft seals, Viton Seals, construction of oil seal. The seals conform to DIN 3760. Rotary Shaft Seals/ Oil Seals. A common type of shaft seal consists of an elastomer (elastic rubberlike) ring bonded to a metallic ring that is a press (tight) fit in the hole in the housing through which the shaft extends. Pay Your Invoice | Polices & Terms | Follow Us on Facebook! A spring secures the lip against the shaft, preventing messy leaks. 2) A gland is used to adjust the pressure on the rings if there is leakage. Again, the slightly wider sealing area helps reduce shaft wear. Having the correct tools makes the seal change a lot easier. Generally, it has been developed as a means of protecting the bearings of rotating shafts. OD paint colors are generally our standard blue, however a color can be specifically requested for new tools. On the larger oil sealed rotary piston pumps that are frequently used on heat treating furnaces there are also removal and insertion tools needed for seals and sometimes bearings. RADIAL SHAFT SEAL NOMENCLATURE. By Joyce Chepkemoi on October 12 2017 in Environment. Oil seals find great deal of usage in gearboxes, hydraulic cylinders, etc. Most oil sealed rotary vane pumps that are in use are made in Europe and will have shaft seals made to metric dimensions. Although the spring allows for some misalignment, both parts need to be installed squarely for a long life and correct operation. 4) The metal stationary part is mounted in the seal cover and the sealing face is highly polished. Its function is to offer the shaft seal the necessary rigidity to enable a stable coupling with its relative housing seating. The seal sits stationary in its housing and the shaft turns. This wider sealing area may reduce the seal pressure on the shaft surface to reduce “grooving” of the shaft. This design is unidirectional, i.e. The seal sits stationary in its housing and the shaft turns. 3. Poly acrylate. The edge of the punched hole forms a seal on the shaft. A bonus was that if the seal had not hardened with heat and age it could be turned over to use the other seal edge if the first edge started to leak. 1) The small leakage from this type of seal helps to lubricate the shaft and packing but requires regular checks to adjust the seal as the packing rings wear. 2.2 Metal case. Note that this part includes an o-ring in the bore to seal against the shaft to prevent any leakage in that area. For some older Roots booster pumps in the marketplace that have lip seals, there are conversion kits available to upgrade them to have mechanical seals. Providing long-lasting sealing efficiency, they consist of a rubber sealing lip, metal case and a spiralled tensioning spring. They perform two essential functions. Rotary shaft seals provide sealing and wiping functionality for rotating and swiveling movements under low pressure and high velocity. 20 Shaft seal: Centrifugal seal (1) with back-up mechanical seal as standstill shaft seal (2) The actual centrifugal seal (fitted as an auxiliary impeller using a liquid ring at the outer diameter) operates contact- and wear-free. 1) Seal Width. The references for mechanical seal systems are found in API 610—Centrifugal Pumps and API 682— Shaft Sealing Systems.Piping systems are required for mechanical seals to provide a flushing fluid across seal faces, establish flow paths for various seal configurations, and establish location of components (e.g., coolers, reservoirs, pressure switches). A shaft seal will create a secure mating surface so that fluids can travel through them in a hollow passage. Most people in engineering for a few years would have heard of the company Chicago Rawhide and seen the CR logo on their products. It the outer housing is bare metal it should be installed with a thin layer of liquid gasket on it to prevent leaks around the housing. An oil seal can also called flexible lip, radial lip, or rotary shaft seal. Applications are the same as type RST, when the requested type is … Shaft seals are a common component in machines and industrial equipment. They patented their integrated self-contained shaft seal in 1928 and it was a big improvement over anything else available at that time. 4) Inner Case. Oil seals are used to seal around a rotating shaft and keep an oil-based lubricant inside an axle, engine, etc. The rubber covered housing provides good sealing capacity even with rough housing bores. Radial oil seals are designed for sealing shafts and spindles. Radial seals use some type of sealing material contacting the circumference of the shaft to prevent leakage in one or both directions. The lip of the expanding collet can be placed behind the seal housing and then the tool is tightened to grip and then withdraw the old seal. With reference to the elastomer, it may be of an inner (see par. Nitrile rubber – The commonly used material for oil seals. Seals need to be installed squarely in the housings for correct operation and using tools of the right size will make the seal change easier. 3 with the molded rubber edge being held onto the shaft surface by the garter spring. Besides o’rings, rotary shaft seals are some of the most common type of seals to be found on machinery. Download: FP-ATS_G-M-Info-Data-Sheet_EN-Rev02_15-11-16.pdf Oil Seals are also known as a Rotary Shaft Seal, shaft seal, lip seal, elastomeric lip seal or any variation of these. It is only a few thousandths of an inch high but it tends to push the oil back into the pump and leaves a slightly wider wiped area of the shaft. Example applications include: Seals are a diverse group of semi-aquatic mammals in the Order Carnivora. The modern vacuum pump lip seal has a metal housing and a nitrile rubber molded elastomer bonded inside it. A very early design of a shaft seal uses square section rings of “packing” in the end housing where the pump shaft extends from the pump body. Rubber types available are Nitrile, Viton ®, Silicone and EPDM. It doesn’t matter if the sleeve becomes worn as the new seal is in a new position on the shaft. All rights reserved. Bearing and seal removal tools are available that have expanding collets of different sizes. These are then followed by the style or type of design. Radial shaft seals, also known as lip seals, are used to seal rotary elements, such as a shaft or rotating bore. 4. For some time, most shaft seals were made in the United States by compression molding. Copyright Howard Tring, Tring Enterprises LLC Vacuum & Low-Pressure Consulting. P/N example:Inch: 10001500-250, WPBG4 = 1.000” shaft dia., 1.500” bore dia., 0.250” width, WPBstyle, ground O.D., Nitrile 90 material. If you can feel the wear with your finger nail it indicates that the shaft should be polished, refinished or replaced. Material used for Oil Seal : Based on the application of the oil seal, the outer skin layer tends to differ. Chicago Rawhide was bought by SKF in 1990 and the name and CR logo was eliminated around 2006. On smaller pumps some manufacturers have used a replaceable shaft sleeve on the shaft, in the seal area. This type is frequently replaced by type R. According to the DIN Standard 3760, category B : View all M oil seals: MST: Similar to type M but with additional dust lip. 1. There are two main groups of seals, radial and axial. This type of seal is more expensive than a lip seal, has the reputation of being more reliable and they eliminate any possibility of shaft wear. • Manufacturing. • Oil refineries. The leather would have been grease lubricated. In addition to the A type, the AS has an extra lip for excluding dust. We offer the following types of oil seals: General Purpose High Performance Oil Seal; Rubber Fabric Oil Seal; Rotary V-Seal; PTFE O-Ring Energised Oil Seal; PTFE Metal Case Oil Seal; PTFE Spring Energised Oil Seal; PTFE Lip Oil Seal; General Purpose High Performance Oil Seal Shaft – the diameter of the shaft where the seal … These are also used on hydraulic cylinder shafts that move axially instead of rotating and can also be used as piston seals with one set of V rings facing each way for a double-acting cylinder. • Off-highway. A spring secures the lip against the shaft, preventing messy leaks. Modern sterntube seals are highly-engineered units designed and manufactured to withstand a rigorous working environment for long periods. 2. On larger pumps that tend to last twenty years or more, this will occur even on a hardened shaft. The pump housing and seal cover plate were chamfered at about thirty degrees inwards within about a half inch of the shaft so that the rubber disc is held at that angle on the shaft surface. The primary function is to retain the bearing or system lubricant in the system to avoid leakage. Site Map Contact Terms and Conditions Privacy, Vacuum Heat Treating: Education & Training, Vacuum Technology with The Heat Treat Doctor, Vacuum Pump Technology: Education & Training, Specific Heat Treating & Brazing Approvals. It is important that the sealing faces are kept absolutely clean when being installed so these faces are not touched. Find your oil seal; M: Metal cased standard Oil Seal with vulcanised sealing lips. Here are some types of the materials used for the outer skin of the oil seal. Grease seals are used to seal more viscous grease lubricants in rotary shaft applications. For certain applications PFPE and EPDM elastomers are used. 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