Pioneer Weston. Dynamic Metal Face Seals. Contact. At Pioneer Weston our goal is to deliver a world class service in every area of our operations.

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1 Pioneer Weston Dynamic Metal Face Seals Contact At Pioneer Weston our goal is to deliver a world class service in every area of our operations. Pioneer Weston 206 Cavendish Place, Birchwood Park, Warrington, Cheshire. WA3 6WU Tel +44 (0) Fax +44 (0) sales-technical@pioneerweston.com Web An Company

2 Pioneer Weston Dynamic Metal Face Seals

3 Company Overview Metal Face Seals Pioneer Weston has been at the forefront of sealing technology for over 60 years and enjoys an enviable reputation with blue chip OEM s. We work in close partnership with our customers to innovate, design and manufacture bespoke solutions to suit a diverse range of applications, no matter how arduous the environment. We are proud to hold ISO9001:2008 quality accreditation for dynamic sealing solutions and specialist products. We continue to invest heavily in our research and development facility forging partnerships with both materials suppliers and academia to expand the boundaries of what is possible with technical sealing solutions, which in turn ensures Pioneer Weston always delivers unrivalled product performance and value to all of our customers. Quality At Pioneer Weston we are quite rightly proud of our high quality standards. Quality is at the core of everything we do; in process, our people and our product. All our employees take personal responsibility for the quality in their sphere of activity and with a Right First Time culture - essential in any Total Quality Management operation. Metal face seals offer bearing protection and lubricant retention on any relatively slow moving rotary shaft, predominantly found in tracked vehicles such as earth movers, mobile cranes and large off-highway vehicles. The new range from Pioneer Weston is designed at our dedicated UK sealing technology centre in Warrington, and assembled in the UK. Products from this range can be adapted and re-engineered to match virtually any custom application. Pioneer Weston s range of seals excel under extreme environments in severe service applications, where the exclusion of contaminants such as sand, rock, mud and water is of vital importance to the protection of your equipment. Therefore providing a robust, efficient solution with long service life and low maintenance. Typical examples of these heavy duty applications include; construction, mining and tracked agricultural equipment, in fact virtually all tracked vehicles rely on these robust seals. Sales and technical support is available globally via our own technical specialists, the ERIKS service centre network and via other leading international distributors and technical partners. Whether the requirement is for small batch samples for test and validation or volume production, Pioneer Weston s quality systems ensure that each product meets the highest quality standards. As the preferred sealing partner of many global manufacturing companies, we have an unrivalled insight into the quality standards that need to be attained. 1

4 Advantages / Benefits Applications Many manufacturers have discovered the benefits offered by Pioneer Weston s range of metal face seals, with reliable supply, consistently high quality and competitive pricing, everybody wins. Corrosion resistant seal rings Special seal and load ring materials to match application requirements Self centering to compensate for shaft eccentricity or misalignment Cost savings from extended machinery life Easy to assemble and minimal maintenance Wide temperature tolerances from -40 C to 200 C Tracked vehicles such as excavators, bulldozers and cranes Conveyor systems Heavy trucks Military vehicles Axles Tunnel boring machines Agricultural machines Mining machines Heavy plant mixers and grinders 2

5 Seal Types There are two common types of metal face seals on the market, the most popular form is the 5000 Series which is more compact while the 5500 Series offers a slight pressure advantage Series The 5000 Series provides a more compact, cost effective sealing solution, but requires precise machining of the housing bore. The secondary sealing element in this series is characterised with the use of an O Ring, and effectively excludes, sand, dirt and water, and is widely used in bulldozer and excavator undercarriage applications Series This seal allows for simpler housing design and construction, the housing is easier to machine but more housing space is required and fewer tooled sizes are available. The secondary sealing element is of a special washer design instead of an O Ring, which also allows a higher pressure capability. The design provides an ideal solution for agricultural equipment and other field machinery. Method of Operation The O Ring and the elastomeric washer provide three different functions: They provide uniform axial pressure for the metallic sealing surfaces to mate effectively whilst self centering the rings. They act as a static seal at the inner diameter against the sealing ring and outer diameter against the housing bore. They transmit the torque from the rotating half of the housing through the faces to the static half and prevent the metal ring from turning with the shaft. The metallic seal surfaces are produced by an automated extremely accurate grinding and lapping process, one of the rings rotates against the other at a right angle to the shaft to provide a leak proof seal. Interchangability and Availability Our range of metal faced seals includes all the popular sizes used today so replacement parts are available for when you upgrade to Pioneer Weston and no matter where you manufacture, we can supply you direct or via our Authorised Distributor. The rings are designed in such a way that they open out from the lapped faces towards the shaft giving a wedge shape gap. This enables easy lubrication to the faces by capillary action and centrifugal force. Lubrication is essential to the life of the seal it keeps running temperatures down and keeps the faces from cold welding together. 3

6 Selection and Material Specification Steel Composition and Selection Ensuring the correct material composition is paramount to successful performance, Pioneer Weston can work with you to analyse your requirement and recommend the most suitable seal to fit your design criteria even helping your engineers to design the installation and provide electronic drawings to speed up the process. Below are the main factors in ensuring the correct selection, the most critical being the correct metal or seal ring material. C Corrosion Resistant Cast Iron This is the most widely used seal face material and is a high alloy, corrosion resistant cast iron with a natural hardness of 58 HRC, after casting it is increased to HRC by heat treatment. These castings are then processed by grinding, lapping and polishing. Maximum operating parameters are 2 bar pressure and 3m/s circumferential speed when lubricated. F Forged Roller Bearing Steel Size Temperature Speed Pressure Media Typical Seal Reference: AM5084-C-NB60 A cheaper alternative to cast iron. Seals made from this material are manufactured by copy turning followed by an induction hardening. After the hardening process the faces will be >58 HRC. Maximum operating parameters for these seals are 1.5 bar pressure and 2 m/s circumferential speed when lubricated. X Casting Alloy Size ref. Metal Ring Elastomer Hardness Developed for the most X-treme applications where high abrasion resistance is necessary to prevent high speed scoring of the faces. Maximum operating parameters for these seals are bar pressure and 3-4 m/s circumferential speed when lubricated. This material is widely used in Mining, Bulldozer and excavator applications. X C F Process Cast Cast Forged Cost High Medium Low Wear Life High Medium/High Low Corrosion Resistance High Low/Medium Low Abrasion Resistance High Medium/High Medium 4

7 Load Ring Materials Selecting the correct material for the O-ring or washer is equally if not more important than the correct metallic face. As part of the ERIKS group (acknowledged as the largest manufacturer and supplier of O-rings throughout Europe) you can be sure Pioneer Weston metal face seals have the compound to meet your requirements. The 4 most common elastomer types for this family of seals are; Nitrile (NB) Chemically, is a copolymer of butadiene and acrylonitrile. Due to its excellent resistance to petroleum products, relative low cost and its ability to be compounded for service over a temperature range of -35 C to +120 C, Nitrile is the most widely used elastomer in the seal industry today. Hydrogenated Nitrile (HN) Was developed to meet higher temperatures than standard NB while retaining resistance to petroleum based oils. HN is resistant to mineral oil-based hydraulic fluids, animal and vegetable fats, diesel fuel, ozone, sour gas, dilute acids and bases. HN also resists new bio-oils (biological oils). HN is suitable for high dynamic loads and has a good abrasion resistance. HN is suitable for temperatures from -30 C to +150 C. Silicone (VMQ) Silicones are a group of elastomeric materials made from silicone, oxygen, hydrogen, and carbon. Extreme temperature range and low temperature flexibility are characteristics of silicone compounds. Silicones possess excellent resistance to extreme temperatures -50 C to +232 C although as a group have poor tensile strength, tear resistance and abrasion resistance. Fluorocarbon (FKM) Fluorocarbon elastomers are highly fluorinated carbon-based polymers used in applications to resist harsh chemical and ozone attack. The working temperature range is considered to be -26 C to +205 C But for short working periods it will take even higher temperatures. Fluorocarbon elastomers have grown to major importance in the seal industry due to its wide range of chemical compatibility, temperature range, low compression set, and excellent aging characteristics. If needed we can develop a special compound to meet specific requirements or choose from over 500 compounds already developed. For more information such as datasheets please visit NB HN VMQ FKM Low Temp Range C High Temp Range C Abrasion Resitance Excellent Excellent Poor Good Oil Resistance Excellent Excellent Poor Excellent Tear Resistance Good Good Poor Good Water Resistance Excellent Excellent Excellent Fair Cost Low Medium/High Medium High 5

8 Figure A Figure B Figure C Installation and Maintenance Pioneer Weston metal faced seals can easily provide over 3000 hours of maintenance free performance without the need for oil replenishment however correct installation of the seal is critical to this long service life. Installation Method 1. Ensure that the inside of the housing is clean, free of burrs, scratches and dust. The load ring must be correctly fitted on the seal and be free from distortion (see Figure A). 2. Install the seal with load ring in the housing (Figure B). At this time, confirm that the end of the housing (1) will be parallel to the lapped surface of the seal (2). If the seal becomes out of alignment, even partially (Figure C) the seal shall have abnormal wear the o-ring will become distorted and will eventually fail prematurely. 3. After insertion, make sure that the precision lapped surfaces are absolutely free of foreign matter, then lightly apply lubricant oil to the mating surfaces. Upon completion of the seal installation, reassemble the housings to the correct setting gap (see below) and fill with lubricating oil. When properly installed, the two mated metal surfaces seal against each other, a thin film of lubrication between these two surfaces minimises wear, and the load rings provide pressure to ensure positive sealing. Setting gap The setting gap (A) determines the amount of axial pressure on the sealing faces and the compression applied to the elastomeric rings. Pioneer Weston seals are designed so a setting gap (A) of 3+/-0.5mm will provide adequate sealing force for the majority of applications. However if the seals are required to work at a continuous high peripheral speed the setting gap should be adjusted in order to prevent an excessive loading of the lubricating oil. This will reduce surface pressures and can be done by increasing the setting gap (A).In this case tests should be conducted to find the most suitable setting. Lubrication Correct installation will count for very little if the lubrication regime is overlooked or incorrectly administered. The seals will have a far greater operating life when provided with good lubricating and heat dissipating qualities when oil is used as opposed to grease. Oil Transmission oils, grade SAE 80 and SAE 90 are recommended. If necessary, lower viscosity lubricants such as engine oil 20W 20 can also be used. In cases where hydraulic fluids / Bio-oils are to be used, please contact Pioneer Weston direct for advice. The oil level should be between the axis centre line and 2/3 of the seal diameter. When filled to the correct level, the oil will generally suffice for the lifetime of the seal. Grease Although grease can be used as a lubricator it is not recommended due to the fact it will not centrifuge to the wedge gaps in the seal faces during dynamic conditions. If grease is used it will result in higher wear, shorter lifetime and can only run at slower sliding speeds. The seal should, on no account, be regreased with a grease gun, as the high pressure of the gun can dislodge the o rings and ultimately destroy them. 6

9 R H CS H2 H1 H4 R 0.5 A 10 Ø D i Ø D O Ø ID Ø D2 * No Burrs H3 Ø D4 Ø D3* Ø D1 * RZ =25-40µm Assembly Seal Set O Ring Housing Dimensions 5000 Series Specification Part No. Seal Set O-Ring Housing Dimensions A +/-0.5 ØDi ØD0 H ØID CS ØD1* ØD2* ØD3* ØD4 H1 H2 min H3 H4 R +/- Tol for * AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM All dimensions in mm 7

10 Part No. Seal Set O-Ring Housing Dimensions A +/-0.5 ØDi ØD0 H ØID CS ØD1* ØD2* ØD3* ØD4 H1 H2 min H3 H4 R +/- Tol for * AM AM AM AM AM AM AM AM AM AM AM , AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM All dimensions in mm 8

11 Part No. Seal Set O-Ring Housing Dimensions A +/-0.5 ØDi ØD0 H ØID CS ØD1* ØD2* ØD3* ØD4 H1 H2 min H3 H4 R +/- Tol for * AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM All dimensions in mm 9

12 H2 H H R 2 max H1 1,5 ±0,5 30 Ø Di Ø Do Ø ID D2 D1 CS Assembly Seal Set Washer Housing Dimensions 5500 Series Specification Part No. Seal Set Washer Housing Dimensions ØDi ØD0 H ØID CS H ØD1 ØD2 H1 H2 AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM AM All dimensions in mm 10

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