14.2, shaft seals are complex shapes that require advanced mold design and molding techniques (see Section 7.3 for discussion of fluoroelastomer molding). 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. 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 conform to DIN 3760. It doesn’t matter if the sleeve becomes worn as the new seal is in a new position on the shaft. 2) Metal Case (Outer) 3) Housing. Most oil sealed rotary vane pumps that are in use are made in Europe and will have shaft seals made to metric dimensions. Again, the slightly wider sealing area helps reduce shaft wear. Chicago Rawhide was bought by SKF in 1990 and the name and CR logo was eliminated around 2006. Nitrile, Fluorocarbon, etc. 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. For some time, most shaft seals were made in the United States by compression molding. 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. It is a simple device for excluding dust, dirt, water or any other contaminant whilst retaining lubricant in rotary shaft equipment. Press-fit seals into the bore around the shaft. 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. On larger pumps that tend to last twenty years or more, this will occur even on a hardened shaft. Common examples include strut seals, hydraulic pump seals, axle seals, power steering seals, and valve stem seals. The primary function is to retain the bearing or system lubricant in the system to avoid leakage. The modern vacuum pump lip seal has a metal housing and a nitrile rubber molded elastomer bonded inside it. Each part contains a very smooth “face” and the two faces are held against each other by a compressed spring. Copyright Howard Tring, Tring Enterprises LLC Vacuum & Low-Pressure Consulting. R – Used with rubber covered O.D as a separator between style and material. One design incorporates a thin wavy line at the seal edge. Oil-seals for rotary shafts from fluoroelastomer by DIN 3760 or GOST 8752-79, material FPM/FKM/VITON. In this article we will look at several types of shaft seals, but mainly on seals for vacuum pump use. 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. We offer a range of different sizes and two different types – R21 and R23. In the late 1920’s, a self contained shaft seal was cre-ated from oil resistant leather assembled into a metal case. Silicone – Used in specific applications where only light loads are applied. The advent of modern elastomers replaced rawhide, … Grease seals are used to seal more viscous grease lubricants in rotary shaft applications. 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. Common configurations include single lip, double lip, triple lip, and four or more lips. 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. 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. 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. Press-fit seals into the bore around the shaft. 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. 2.2.2) or a part-coated type (see par. 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. The •FP• oil seals provide the right solution to every sealing problem. 2. A spring secures the lip against the shaft, preventing messy leaks. Also known as oil seals, use these to retain oil on rotating shafts in motors, pumps, bearings, and gearboxes. The rotary shaft oil seal is an indispensable component in any lubricated rotating equipment.. (Fig. Rotary shaft seals provide sealing and wiping functionality for rotating and swiveling movements under low pressure and high velocity. These are then followed by the style or type of design. An oil seal can also called flexible lip, radial lip, or rotary shaft seal. OD paint color designations. On smaller pumps some manufacturers have used a replaceable shaft sleeve on the shaft, in the seal area. For many small and medium shaft size applications in the vacuum pump industry the mass produced “lip seal” is now the seal of choice. Ground OD parts will not come painted unless specially requested and approved. 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. Fig. Rotary Shaft Seals/ Oil Seals. • Manufacturing. The seals are used in a full range of equipment in the following industries: • Automotive. RADIAL SHAFT SEAL NOMENCLATURE. Finally there are designations for material and an other design preferences. Each part contains a very smooth “face” and the two faces are held against each other by a compressed spring. In the early days, before nitrile rubber was available, radial shaft seals were made of a leather ring held in a metal outer housing. Another design has angled overlapping lines molded on the sealing area which tend to push the oil back into the pump. 2.2.3). •FP• rotary shaft oil seals are produced according to modern engineering techniques with high-performing materials, as requested by industry specifications. Material used for Oil Seal : Based on the application of the oil seal, the outer skin layer tends to differ. 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). Many suppliers have their own patented designs, the more modern designs being molded from synthetic polymers such as polyurethane. 3. • Off-highway. Download: FP-ATS_G-M-Info-Data-Sheet_EN-Rev02_15-11-16.pdf Axial seals, also called mechanical seals and face seals, have two parts a stationary part and a rotating part. Although the spring allows for some misalignment, both parts need to be installed squarely for a long life and correct operation. 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. What is a shaft Duramax uses an oil-impregnated nylon bearing while Nautical Specialties and PYI incorporate a carbon-graphite bearing. 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. (Fig. This article describes what is an oil seal, types of oil seal materials, lip seals, shaft seals, Viton Seals, construction of oil seal. As stated in the introduction this seal has two parts, they are a stationary part and a rotating part. 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. 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. 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. 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. Most modern rotary vane direct drive oil sealed vacuum pumps have a pressurized oil circuit. All rights reserved. Nitrile shaft seals are used as oil seals and are designed to keep your equipment running smoothly. • Power transmission. 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. 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. Part Number DescriptionAll of our oil seal part numbers are comprised of the shaft, bore and width dimensions,. Shaft seals are a common component in machines and industrial equipment. 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. A bearded seal. The rubberized housings are designed to eliminate this problem. 2.2.1), an outer (see par. Specialists in Vacuum Furnace Technology - High Quality Vacuum Furnace Manufacturer, © Copyright 2016 VAC AERO - 4. Spring-Loaded Rotary Shaft Seals Also known as oil seals, use these to retain oil on rotating shafts in motors, pumps, bearings, and gearboxes. 2.2 Metal case. Oil Seals are also known as a Rotary Shaft Seal, shaft seal, lip seal, elastomeric lip seal or any variation of these. 5) Outer Face. 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. 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. Find your oil seal; M: Metal cased standard Oil Seal with vulcanised sealing lips. The pump may incorporate a drip tray or drain under the stuffing box to handle the leakage. The rubber covered housing provides good sealing capacity even with rough housing bores. They're used in automotive, rail and marine applications as well as in pumps and mining. Example applications include: 1. 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 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). 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. 4) The metal stationary part is mounted in the seal cover and the sealing face is highly polished. 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. They tend to be used more on the larger sizes of vacuum pumps and also on Roots booster pumps. 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. 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. • 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. Axial seals, also called mechanical seals and face seals, have two parts a stationary part and a rotating part. The inner seal can be more difficult to service. 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. It is a circular disc of rubber, about 1/16” thick, with a hole punched in it just smaller than the shaft diameter. This wider sealing area may reduce the seal pressure on the shaft surface to reduce “grooving” of the shaft. Oil Seal Selection Guide. 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. Shaft – the diameter of the shaft where the seal … 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. As can be seen from the seal cross-section shown in Fig. Seals are a diverse group of semi-aquatic mammals in the Order Carnivora. 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