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. The rubberized housings are designed to eliminate this problem. For many small and medium shaft size applications in the vacuum pump industry the mass produced “lip seal” is now the seal of choice. Rotary shaft seals provide sealing and wiping functionality for rotating and swiveling movements under low pressure and high velocity. The design also includes a metal “lantern ring” installed between the rings of packing to allow for lubrication or flushing. Poly acrylate. The inner seal can be more difficult to service. • Power transmission. In the late 1920’s, a self contained shaft seal was cre-ated from oil resistant leather assembled into a metal case. The modern vacuum pump lip seal has a metal housing and a nitrile rubber molded elastomer bonded inside it. It was a very simple design and worked well. If you can feel the wear with your finger nail it indicates that the shaft should be polished, refinished or replaced. 3 with the molded rubber edge being held onto the shaft surface by the garter spring. Oil seals are used to seal around a rotating shaft and keep an oil-based lubricant inside an axle, engine, etc. The •FP• oil seals provide the right solution to every sealing problem. On any machine that has a rotating shaft there will be a shaft seal of one type or another. Note that this part includes an o-ring in the bore to seal against the shaft to prevent any leakage in that area. The seal sits stationary in its housing and the shaft turns. This seal is unidirectional and has to be selected for clockwise or anti-clockwise rotation. 2.2 Metal case. Press-fit seals into the bore around the shaft. 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. Most oil sealed rotary vane pumps that are in use are made in Europe and will have shaft seals made to metric dimensions. 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. 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. 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. For some time, most shaft seals were made in the United States by compression molding. 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. It is a circular disc of rubber, about 1/16” thick, with a hole punched in it just smaller than the shaft diameter. The Different Types of Seals. The type AS shaft seal according to DIN3760 is the second most commonly used oil seal for low pressure radial sealing. • Manufacturing. Oil Seals are also known as a Rotary Shaft Seal, shaft seal, lip seal, elastomeric lip seal or any variation of these. A bearded seal. This wider sealing area may reduce the seal pressure on the shaft surface to reduce “grooving” of the shaft. Common examples include strut seals, hydraulic pump seals, axle seals, power steering seals, and valve stem seals. On larger pumps that tend to last twenty years or more, this will occur even on a hardened shaft. Having the correct tools makes the seal change a lot easier. 4) Inner Case. 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. These are then followed by the style or type of design. 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. Like all types of seals, they are designed to prevent substances — typically oil or other fluids — from leaking. 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. A spring secures the lip against the shaft, preventing messy leaks. 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. The most significantdevelopment in the evolution of the radial lip seal happened toward the end of World War II. 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. 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. Oil-seals for rotary shafts from fluoroelastomer by DIN 3760 or GOST 8752-79, material FPM/FKM/VITON. We cannot change paint color for any stock parts. Chicago Rawhide was bought by SKF in 1990 and the name and CR logo was eliminated around 2006. Common configurations include single lip, double lip, triple lip, and four or more lips. 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. What is a shaft Each part contains a very smooth “face” and the two faces are held against each other by a compressed spring. 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. 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. 3. The advent of modern elastomers replaced rawhide, … Part Number Description All of our oil seal part numbers are comprised of the shaft, bore and width dimensions,. 1. 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. 2) A gland is used to adjust the pressure on the rings if there is leakage. 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. Shaft seals are a common component in machines and industrial equipment. They are inexpensive and when installed correctly have a life of several years. •FP• rotary shaft oil seals are produced according to modern engineering techniques with high-performing materials, as requested by industry specifications. 5) Outer Face. Rubber types available are Nitrile, Viton ®, Silicone and EPDM. They tend to be used more on the larger sizes of vacuum pumps and also on Roots booster pumps. 2.2.3). Silicone – Used in specific applications where only light loads are applied. 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. Stock parts which are not painted can have a color added after manufacture, by request. Find your oil seal; M: Metal cased standard Oil Seal with vulcanised sealing lips. (Fig. Providing long-lasting sealing efficiency, they consist of a rubber sealing lip, metal case and a spiralled tensioning spring. 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. Other designs of the seal lip area are available to help lengthen the life of the seal and prevent leakage. 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. 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. 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 … 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 Available with or without external dust lip, they are self-retained in an open groove to ISO 6194 and DIN 3760. 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. 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. Oil Seal Selection Guide. August 13, 2013 by VAC AERO International. Besides o’rings, rotary shaft seals are some of the most common type of seals to be found on machinery. OD paint colors are generally our standard blue, however a color can be specifically requested for new tools. 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. For certain applications PFPE and EPDM elastomers are used. Generally, it has been developed as a means of protecting the bearings of rotating shafts. It doesn’t matter if the sleeve becomes worn as the new seal is in a new position on the shaft. R – Used with rubber covered O.D as a separator between style and material. Seals are a diverse group of semi-aquatic mammals in the Order Carnivora. 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. Radial shaft seals exert pressure on the pump shaft due to the garter spring, and this helps with the sealing action. Pay Your Invoice | Polices & Terms | Follow Us on Facebook! This article describes what is an oil seal, types of oil seal materials, lip seals, shaft seals, Viton Seals, construction of oil seal. Radial oil seals are designed for sealing shafts and spindles. • 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. 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). 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. 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. 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). One design incorporates a thin wavy line at the seal edge. F.ex., TCR2 is TC style, NBR material, the ‘R’ is a place holder, R & L are also used with helix designs. Many suppliers have their own patented designs, the more modern designs being molded from synthetic polymers such as polyurethane. An oil seal can also called flexible lip, radial lip, or rotary shaft seal. There are two main groups of seals, radial and axial. S. Sizes of surface conditions. Axial seals, also called mechanical seals and face seals, have two parts a stationary part and a rotating part. 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. Part Number DescriptionAll of our oil seal part numbers are comprised of the shaft, bore and width dimensions,. Download: FP-ATS_G-M-Info-Data-Sheet_EN-Rev02_15-11-16.pdf 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. Grease seals are used to seal more viscous grease lubricants in rotary shaft applications. Specialists in Vacuum Furnace Technology - High Quality Vacuum Furnace Manufacturer, © Copyright 2016 VAC AERO - 3) The outer housing can be metal or can have a thin layer of rubber over the metal. Here are some types of the materials used for the outer skin of the oil seal. Installing a new shaft seal onto a “grooved” shaft is not recommended as it may shorten the life of the new seal. This was the firstradial lip seal to be press fitinto an outside diameter (OD) bore. 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. Radial shaft seals, also known as lip seals, are used to seal rotary elements, such as a shaft or rotating bore. Its function is to offer the shaft seal the necessary rigidity to enable a stable coupling with its relative housing seating. The seal type for oil seals and grease seals can be oil seals or other types. All rights reserved. Where lubrications is doubtful, abrasive matter is present, or shaft speed is greater than 4m/sec, 55 HRC is preferred. 2. 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. A shaft seal will create a secure mating surface so that fluids can travel through them in a hollow passage. An H will proceed the design for Helix, F.Ex., HTCR is TC style, right helix. As can be seen from the seal cross-section shown in Fig. The edge of the punched hole forms a seal on the shaft. Press-fit seals into the bore around the shaft. Oil seals find great deal of usage in gearboxes, hydraulic cylinders, etc. 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. 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. One downside is that this pressure can also wear a groove in the shaft after years of running. 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. 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. it doesn’t matter which way the shaft rotates. 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). 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 rubber covered housing provides good sealing capacity even with rough housing bores. 2.2.1), an outer (see par. This type of seal generally needs little or no maintenance for small motors from ¼ to perhaps 10 HP. Axial seals, also called mechanical seals and face seals, have two parts a stationary part and a rotating part. RADIAL SHAFT SEAL NOMENCLATURE. Also known as oil seals, use these to retain oil on rotating shafts in motors, pumps, bearings, and gearboxes. Nitrile, Fluorocarbon, etc. 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. Early radial shaft seals utilized rawhide as the sealing element, and many elastomeric seal companies today once were tanneries. Each part contains a very smooth “face” and the two faces are held against each other by a compressed spring. 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. 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. (Fig. OD paint color designations. Finally there are designations for material and an other design preferences. The seal sits stationary in its housing and the shaft turns. The seals are used in a full range of equipment in the following industries: • Automotive. Material used for Oil Seal : Based on the application of the oil seal, the outer skin layer tends to differ. 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. The rotary shaft oil seal is an indispensable component in any lubricated rotating equipment.. 2.2.2) or a part-coated type (see par. 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. The minimum hardness on the area where the sealing lip contacts the shaft should be 45 HRC. 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