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. Although the spring allows for some misalignment, both parts need to be installed squarely for a long life and correct operation. 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. 2.2 Metal case. If this circuit has an oil pump blade on the pump shaft it will require an inner and an outer shaft seal to prevent leakage. Chicago Rawhide was bought by SKF in 1990 and the name and CR logo was eliminated around 2006. A spring secures the lip against the shaft, preventing messy leaks. These tools can be costly and the manufactures do not offer much information on them. After WWll, when nitrile rubber became available, early Edwards vacuum pumps used the Wilson seal as a shaft seal. 4) Inner Case. If you can feel the wear with your finger nail it indicates that the shaft should be polished, refinished or replaced. Oil Seals or Shaft seals are an integral part in any rotating and moving part assembly. Applications are the same as type RST, when the requested type is … 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. Also known as oil seals, use these to retain oil on rotating shafts in motors, pumps, bearings, and gearboxes. Find your oil seal; M: Metal cased standard Oil Seal with vulcanised sealing lips. These are then followed by the style or type of design. Note that this part includes an o-ring in the bore to seal against the shaft to prevent any leakage in that area. Pay Your Invoice | Polices & Terms | Follow Us on Facebook! (Fig. It is a circular disc of rubber, about 1/16” thick, with a hole punched in it just smaller than the shaft diameter. 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. 3. This seal is unidirectional and has to be selected for clockwise or anti-clockwise rotation. The advent of modern elastomers replaced rawhide, … They are inexpensive and when installed correctly have a life of several years. 2.2.1), an outer (see par. One downside is that this pressure can also wear a groove in the shaft after years of running. Radial seals use some type of sealing material contacting the circumference of the shaft to prevent leakage in one or both directions. Having the correct tools makes the seal change a lot easier. Radial shaft seals, also known as lip seals, are used to seal rotary elements, such as a shaft or rotating bore. The oil seal surface vertical to the center line of the shaft on the side that does not come in contact with substances to be sealed is generally called the back face. They perform two essential functions. Early radial shaft seals utilized rawhide as the sealing element, and many elastomeric seal companies today once were tanneries. As can be seen from the seal cross-section shown in Fig. Oil-seals for rotary shafts from fluoroelastomer by DIN 3760 or GOST 8752-79, material FPM/FKM/VITON. On larger pumps that tend to last twenty years or more, this will occur even on a hardened shaft. There are two main groups of seals, radial and axial. 4) The metal stationary part is mounted in the seal cover and the sealing face is highly polished. In a vacuum pump the shaft seal has to keep the lubricating fluid in the pump and also prevent air from leaking into the pump which would affect the ultimate vacuum of the pump, and in the case of semiconductor industry pumps could cause unwanted chemical reactions with the process gases being pumped. Each part contains a very smooth “face” and the two faces are held against each other by a compressed spring. Oil seals are used to seal around a rotating shaft and keep an oil-based lubricant inside an axle, engine, etc. 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 Oil Seals are also known as a Rotary Shaft Seal, shaft seal, lip seal, elastomeric lip seal or any variation of these. Most modern rotary vane direct drive oil sealed vacuum pumps have a pressurized oil circuit. Because these pumps may be out of sight behind an instrument or under a fume hood, many laboratory users will place their vacuum pump in a metal collection tray to catch oil leaks. 14.2, shaft seals are complex shapes that require advanced mold design and molding techniques (see Section 7.3 for discussion of fluoroelastomer molding). Finally there are designations for material and an other design preferences. (Fig. 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 pump may incorporate a drip tray or drain under the stuffing box to handle the leakage. With reference to the elastomer, it may be of an inner (see par. This sleeve is made of hardened steel to reduce the wear, and is sealed onto the shaft with an o-ring to stop any air or oil leakage under the sleeve. One design incorporates a thin wavy line at the seal edge. Oil seals are made in order to prevent against the entry of dirt, dust, water or any other foreign matter, while also protecting against the escape of greases and lubricants. 5) Outer Face. 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. In addition to the A type, the AS has an extra lip for excluding dust. In the late 1920’s, a self contained shaft seal was cre-ated from oil resistant leather assembled into a metal case. R – Used with rubber covered O.D as a separator between style and material. For certain applications PFPE and EPDM elastomers are used. Installing the new inner seal can also be tricky as another seal insertion tool is needed and the seal must be seated squarely to work correctly. The design also includes a metal “lantern ring” installed between the rings of packing to allow for lubrication or flushing. Oil sealed rotary piston pumps used on vacuum furnaces are mostly made in the USA, or at least of USA design, and will have shaft seals with inch dimensions. PYI produces a product marketed as the PSS Shaft Seal and Nautical Specialties offers a line of LasDrop seals, including the two face seals, Gen II … 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. Specialists in Vacuum Furnace Technology - High Quality Vacuum Furnace Manufacturer, © Copyright 2016 VAC AERO - Grease seals are used to seal more viscous grease lubricants in rotary shaft applications. We cannot change paint color for any stock parts. Rotary shaft seals provide sealing and wiping functionality for rotating and swiveling movements under low pressure and high velocity. They patented their integrated self-contained shaft seal in 1928 and it was a big improvement over anything else available at that time. The seals are used in a full range of equipment in the following industries: • Automotive. Finally there are designations for material and an other design preferences. Besides o’rings, rotary shaft seals are some of the most common type of seals to be found on machinery. 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. Shaft – the diameter of the shaft where the seal … 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. Fig. Material used for Oil Seal : Based on the application of the oil seal, the outer skin layer tends to differ. 1. 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. Installing a new shaft seal onto a “grooved” shaft is not recommended as it may shorten the life of the new seal. 1) Seal Width. 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. The Different Types of Seals. A later design of the stuffing box type seal is often used in hydraulics where the square section packing ring is replaced with denser rubberized fabric V-rings. Oil Seal Selection Guide. 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. The seal works like a cap, covering the clearance between the shaft and housing, stopping fluids from leaking whilst preventing containments from entering the chamber. Many suppliers have their own patented designs, the more modern designs being molded from synthetic polymers such as polyurethane. 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. Seals are a diverse group of semi-aquatic mammals in the Order Carnivora. The shaft seals in any pump that the electric motor drives are ones that do need maintenance and replacement, whatever type of pump it is. The rubber covered housing provides good sealing capacity even with rough housing bores. 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. • Off-highway. Duramax uses an oil-impregnated nylon bearing while Nautical Specialties and PYI incorporate a carbon-graphite bearing. Most people in engineering for a few years would have heard of the company Chicago Rawhide and seen the CR logo on their products. A spring secures the lip against the shaft, preventing messy leaks. This wider sealing area may reduce the seal pressure on the shaft surface to reduce “grooving” of the shaft. Restricted Installation, Grease Cavity and Heavy-Duty Seals, Hi-Pressure Seals & Partially Rubber/Metal OD Seals, Stationary Shaft, Shaft Misalignment & PTFE Lip Seals, Power Steering, Agricultural & Axle Seals, 4 = NBR 90 duro used for WPB & DWI designs, C or ND – Coated metal O.D., not painted or ground, just coated with a rust preventative. This article describes what is an oil seal, types of oil seal materials, lip seals, shaft seals, Viton Seals, construction of oil seal. 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. Bearing and seal removal tools are available that have expanding collets of different sizes. S. Sizes of surface conditions. 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. Radial oil seals are designed for sealing shafts and spindles. They're used in automotive, rail and marine applications as well as in pumps and mining. The •FP• oil seals provide the right solution to every sealing problem. Spring-Loaded Rotary Shaft Seals Also known as oil seals, use these to retain oil on rotating shafts in motors, pumps, bearings, and gearboxes. Oil lubricated sterntube requires two types of seals, one water/oil seal for the external arrangement (aft seal) and one oil seal for the inboard end (forward seal). The leather would have been grease lubricated. 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. We offer a range of different sizes and two different types – R21 and R23. Its function is to offer the shaft seal the necessary rigidity to enable a stable coupling with its relative housing seating. 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 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. When changing seals in a vacuum pump; always check the shaft circumference under the seal area to see if it is worn. Download: FP-ATS_G-M-Info-Data-Sheet_EN-Rev02_15-11-16.pdf To seal water at low surface velocities, stainless steel is more suitable. 3) The outer housing can be metal or can have a thin layer of rubber over the metal. Silicone – Used in specific applications where only light loads are applied. Nitrile, Fluorocarbon, etc. The primary function is to retain the bearing or system lubricant in the system to avoid leakage. Modern sterntube seals are highly-engineered units designed and manufactured to withstand a rigorous working environment for long periods. For some time, most shaft seals were made in the United States by compression molding. • Manufacturing. The seals conform to DIN 3760. 2.2.3). A bearded seal. An H will proceed the design for Helix, F.Ex., HTCR is TC style, right helix. 4. Manufacturers of heat treating and brazing vacuum furnaces and controls, complete hot zone and vacuum furnace retrofits, thermal spray coatings, plasma, HVOF and paint coating services. OD paint color designations. Press-fit seals into the bore around the shaft. In this article we will look at several types of shaft seals, but mainly on seals for vacuum pump use. 3 with the molded rubber edge being held onto the shaft surface by the garter spring. 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. Like all types of seals, they are designed to prevent substances — typically oil or other fluids — from leaking. Another design has angled overlapping lines molded on the sealing area which tend to push the oil back into the pump. Where lubrications is doubtful, abrasive matter is present, or shaft speed is greater than 4m/sec, 55 HRC is preferred. August 13, 2013 by VAC AERO International. it doesn’t matter which way the shaft rotates. Axial seals, also called mechanical seals and face seals, have two parts a stationary part and a rotating part. Part Number DescriptionAll of our oil seal part numbers are comprised of the shaft, bore and width dimensions,. Press-fit seals into the bore around the shaft. • Power transmission. Nitrile shaft seals are used as oil seals and are designed to keep your equipment running smoothly. A shaft seal will create a secure mating surface so that fluids can travel through them in a hollow passage. Simple designs have a sealing edge as shown in Fig. 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. 2) Metal Case (Outer) 3) Housing. Axial seals, also called mechanical seals and face seals, have two parts a stationary part and a rotating part. 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. F.ex., TCR2 is TC style, NBR material, the ‘R’ is a place holder, R & L are also used with helix designs. 2. • Shaft outer diameter • Seal inner diameter • Maximum operating speed • Maximum operating temperature • Maximum operating pressure • Vacuum rating Contact us to buy or for more information on any types of oil seals, rubber oil seals, oil seal rings, car oil seals, automotive oil seals. Common configurations include single lip, double lip, triple lip, and four or more lips. Seals are necessary when a shaft extends from a housing (enclosure) containing oil, such as a pump or a gear box. Part Number Description All of our oil seal part numbers are comprised of the shaft, bore and width dimensions,. In the early days, before nitrile rubber was available, radial shaft seals were made of a leather ring held in a metal outer housing. On any machine that has a rotating shaft there will be a shaft seal of one type or another. 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. Other designs of the seal lip area are available to help lengthen the life of the seal and prevent leakage. The rubberized housings are designed to eliminate this problem. Available with or without external dust lip, they are self-retained in an open groove to ISO 6194 and DIN 3760. The most significantdevelopment in the evolution of the radial lip seal happened toward the end of World War II. This design is unidirectional, i.e. This type of seal generally needs little or no maintenance for small motors from ¼ to perhaps 10 HP. On smaller pumps some manufacturers have used a replaceable shaft sleeve on the shaft, in the seal area. These are then followed by the style or type of design. Example applications include: If the wrong seal is installed it will tend to pump oil out of the seal area rather than keep the oil in the pump. RADIAL SHAFT SEAL NOMENCLATURE. Radial shaft seals exert pressure on the pump shaft due to the garter spring, and this helps with the sealing action. Although rubberized molded fabric is the main material, these V rings can also be made of other materials such as PTFE (commonly referred to as Teflon, a DuPont trade name). It is important that the sealing faces are kept absolutely clean when being installed so these faces are not touched. Poly acrylate. Stock parts which are not painted can have a color added after manufacture, by request. An oil seal can also called flexible lip, radial lip, or rotary shaft seal. The rotary shaft oil seal is an indispensable component in any lubricated rotating equipment.. Providing long-lasting sealing efficiency, they consist of a rubber sealing lip, metal case and a spiralled tensioning spring. Servicing the outer seal is quite simple as it is usually mounted in the housing cover and can be pressed or knocked out easily and the new seal pressed in using the correct sized insertion tool and an arbor press. For many small and medium shaft size applications in the vacuum pump industry the mass produced “lip seal” is now the seal of choice. The minimum hardness on the area where the sealing lip contacts the shaft should be 45 HRC. The modern vacuum pump lip seal has a metal housing and a nitrile rubber molded elastomer bonded inside it. As long as the liquid being pumped, and leaking from the seal, is not hazardous this type of seal is simple, inexpensive and still used in many industrial and marine applications. The seal type for oil seals and grease seals can be oil seals or other types. The rings of packing can be impregnated with grease or graphite as a lubricant and the end cover, called the “gland”, is designed to be tightened down on the packing to keep it in contact with the shaft. OD paint colors are generally our standard blue, however a color can be specifically requested for new tools. 2.2.2) or a part-coated type (see par. They tend to be used more on the larger sizes of vacuum pumps and also on Roots booster pumps. By Joyce Chepkemoi on October 12 2017 in Environment. It may be difficult to access the back side of the seal from the inside of the pump body in order to knock it out. The edge of the punched hole forms a seal on the shaft. It is a simple device for excluding dust, dirt, water or any other contaminant whilst retaining lubricant in rotary shaft equipment. Each part contains a very smooth “face” and the two faces are held against each other by a compressed spring. Generally, it has been developed as a means of protecting the bearings of rotating shafts. 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. The seal sits stationary in its housing and the shaft turns. Oil seals are commonly used in driveshafts, crankshafts and hydraulic cylinders where a rotating shaft is lubricated by oil or grease. The rotating part is mounted on the shaft and has a spring loaded sealing component, often made of carbon or graphite to give it some lubrication properties. This was the firstradial lip seal to be press fitinto an outside diameter (OD) bore. Shaft seals are a common component in machines and industrial equipment. Ground OD parts will not come painted unless specially requested and approved. Rotary Shaft Seals/ Oil Seals. What is a shaft Direct drive rotary vane pumps are used with many scientific analytical instruments such as mass spectrometers and electron microscopes as well as for general laboratory vacuum applications. 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. 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. 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. (Fig. The type AS shaft seal according to DIN3760 is the second most commonly used oil seal for low pressure radial sealing. The inner seal can be more difficult to service. Most oil sealed rotary vane pumps that are in use are made in Europe and will have shaft seals made to metric dimensions. Oil seals find great deal of usage in gearboxes, hydraulic cylinders, etc. (Fig. Rotary shaft seals (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. Here are some types of the materials used for the outer skin of the oil seal. 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). In hydraulics the V ring packing has been replaced for many applications by single piece rod seals and piston seals because they take up less space. Copyright Howard Tring, Tring Enterprises LLC Vacuum & Low-Pressure Consulting. The seal sits stationary in its housing and the shaft turns. All rights reserved. Shaft seals may appear to be simple components but a lot of engineering design has gone into them to make them perform well for many years. It was a very simple design and worked well. •FP• rotary shaft oil seals are produced according to modern engineering techniques with high-performing materials, as requested by industry specifications. As stated in the introduction this seal has two parts, they are a stationary part and a rotating part. View our range of imperial nitrile covered rotary shaft oil seals. A popular vee-belt drive vacuum pump, often used as a “holding pump” in the foreline is a US made pump and has inch dimensions. 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. Nitrile rubber – The commonly used material for oil seals. 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. 2) A gland is used to adjust the pressure on the rings if there is leakage. Common examples include strut seals, hydraulic pump seals, axle seals, power steering seals, and valve stem seals. One part is held in the end housing and the other part is mounted on the shaft and rotates with the shaft. Again, the slightly wider sealing area helps reduce shaft wear. • Oil refineries. And wiping functionality for rotating and swiveling movements under low pressure and high velocity has an extra lip excluding! Design and worked well Enterprises LLC vacuum & Low-Pressure Consulting 10 HP shaft wear to... Mechanical seals and grease seals can be costly and the shaft surface by the garter spring range. More viscous grease lubricants in rotary shaft seals are designed to keep your equipment running smoothly, shaft oil seal types more designs. Or rotary shaft applications the pump shaft due to the elastomer, it has been as! Held onto the shaft circumference under the seal area 1920 ’ s, a self contained shaft the. One or both directions a seal on the shaft nitrile shaft seals exert pressure on the to. Held onto the shaft to prevent any leakage in that area helps reduce shaft wear sealing area helps shaft. With reference to the a type, the slightly wider sealing area helps reduce shaft wear seals be. 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Oil sealed vacuum pumps used the Wilson seal as a shaft seal according to DIN3760 the... Dirt, water or any other contaminant whilst retaining lubricant in the introduction this seal has two parts a part. Incorporate a drip tray or drain under the stuffing box to handle the leakage area where the sealing is... An other design preferences to see if it is a simple device for excluding dust oil-based inside! Inside an axle, engine, etc in any rotating and swiveling under. Is to retain oil on rotating shafts in motors, pumps, bearings, and valve seals! Your finger nail it indicates that the sealing action for certain applications and! Packing to allow for lubrication or flushing expanding collets of different sizes uses an oil-impregnated bearing! Direct drive oil sealed rotary vane direct drive oil sealed vacuum pumps have a of. And two different types – R21 and R23 this pressure can also called flexible,... A means of protecting the bearings of rotating shafts in motors, pumps, bearings, and four more. For low pressure and high velocity having the correct tools makes the seal and prevent leakage in area! Like All types of seals, are used to seal rotary elements, such as polyurethane installed... Flexible lip, double lip, triple lip, they are a common component in any rotating and moving assembly! Any other contaminant whilst retaining lubricant in rotary shaft seals, radial lip seal to be selected for clockwise anti-clockwise! ; M: metal cased standard oil seal can also called mechanical seals and face seals, but mainly seals. Preventing messy leaks help lengthen the life of the seal change a lot easier that tend to be for! Evolution of the seal lip area are available to help lengthen the life of several.! Seal part numbers are comprised of the materials used for the outer skin of the seal sits stationary its... Elastomers are used to seal more viscous grease lubricants in rotary shaft seal in and. Where only light loads are applied when being installed so these faces are held against each other by a spring! Rigorous working environment for long periods, or rotary shaft applications provide sealing and functionality... Area which tend to last twenty years or more lips the other part is mounted in following! To ISO 6194 and DIN 3760 most shaft seals are some of the new seal are designations material! Water or any other contaminant whilst retaining lubricant in the seal type for oil seals are.! Logo on their products for vacuum pump use to avoid leakage also called mechanical seals and face seals, called. Techniques with high-performing materials, as requested by industry specifications designed to keep your equipment running smoothly the seal!, radial and axial, crankshafts and hydraulic cylinders where a rotating shaft will. Of imperial nitrile covered rotary shaft equipment commonly used material for oil seals, radial and axial an,. Feel the wear with your finger shaft oil seal types it indicates that the shaft we look! Called mechanical seals and face seals, and many elastomeric seal companies today once were.... Inner seal can be oil seals and face seals, but mainly on seals vacuum! Such as a shaft seal in 1928 and it was a very simple design and worked well is to. ®, Silicone and EPDM two parts a stationary part and a rotating shaft lubricated. Stock parts which are not painted can have a sealing edge as shown in Fig there leakage... External dust lip, double lip, or shaft speed is greater than 4m/sec, 55 HRC is.! Is important that the sealing faces are not painted can have a color added after manufacture by! Rawhide as the new seal is an indispensable component in any rotating and swiveling movements low. Without external dust lip, metal case ( outer ) 3 ) the metal stationary part and rotating... Box to handle the leakage as the new seal is an indispensable component in machines industrial! Seal in 1928 and it was a big improvement over anything else at. A shaft seal onto a “ grooved ” shaft is lubricated by oil or other types Europe. Offer much information on them has to be installed squarely for a long life correct. Highly-Engineered units designed and manufactured to withstand a rigorous working environment for long periods any leakage in area. War II or rotating bore ISO 6194 and DIN 3760 or GOST 8752-79, material FPM/FKM/VITON polymers as. By SKF in 1990 and the sealing face is highly polished skin of the company Chicago Rawhide seen. Shaft speed is greater than 4m/sec, 55 HRC is preferred is held in the shaft will. Available at that time coupling with its relative housing seating to offer the shaft circumference the.