GMN Paul Müller Industrie GmbH & Co. KG Non-Contact Seals Äußere Bayreuther Str. 230 · D-90411 Nuremberg Phone: +49 911-5691-0 · Fax: +49 911-5691-221 www.gmn.de Non-Contact Seals: Phone: +49 (0) 911-56 91-616 · Fax: +49 911-5691-569 Mail: [email protected]

Non-contact seals - Introduction - Classification - Comparisons to contact seals - Need to know information - Function - Non-Contact Seal benefits - Application examples - Characteristics of sealing system - Parameters of a non-contact seals Pages 4–13 GMN Labyrinth Metal Seals GMN Labyrinth Plastic Seals - Technical data - Product characteristics - Dimension table - Specials - width, material, etc. - Dimensional tolerances - Technical data - Product characteristics - Dimension table - Specials - width, material, etc. - Dimensional tolerances - General information - Surrounding construction -...

The machine tool industry and its end users are continuously demanding the most in quality in every aspect of their machine. Highly specialized components are resulting in shorter process time, higher rotating speed, flexible material characteristics and a huge range of operating conditions. Simultaneously, new energysaving solutions and maintenance-free characteristics are increasing economic efficiency of modern machine systems. Based on decades of experience, GMN has specialized in producing extremely high quality machine tool components. Through this strategy, GMN manufactures a wide range...

Classification GMN Non-Contact Seals Varying industrial processes and demands require specialized sealing systems which could be classified into several product groups. GMN provides efficient, economical, quality sealing components made of metal or plastic for concentric rotating parts. The design of GMN Non-Contact Seals offers - compared to conventional contact seals - operation without any friction, an essential advantage for many seal applications. Seals (Classification) Comparisons of Non-Contact Seals vs. Contact Seals Dynamic seals Static seals Linear movement Characteristic GMN Non-Contact...

Non-Contact Seals Basics In correlation with the application’s design, non-contact seals also: - Protect/shield inner workings of the application - Throttling/switching - Back transport of application medium(s) - Optional draining within the seal design The seal itself as well as the specific design encompassing the seal satisfies only parts of the sealing requirement. Function The maximum efficiency of a GMN labyrinth seal is achieved with an optimised interaction of the seal-component and the surrounding construction/design. Sealing function at machine standstill The functions of protecting,...

GMN Non-Contact Seals Benefits and applications Benefits The specific design of GMN Labyrinth Seals allows operation without any friction. Many different applications are taking advantage of this major benefit: - High-speed (no-wear operation) Technical benefits - Sealing against dust (Pre-greased GMN Labyrinth Seal made of plastic) - No wear - Rated for high rotating speeds - Sealing efficiency is independent from direction of rotation - No abrasion, no contamination - No frictional heat increase - No thermal effects to the surrounding application Functional benefits - Maintenance free - Constant...

www.gmn.de The performance of any seal in various machines is extremely important to the life and efficiency of the complete system. Because of this, GMN prefers to help customers early in the design phase to ensure that everything will perform as planned and the correct design choices are made. Different applications require specialized and individual solutions; there is a large variety of products on the market. The table below includes some general information to help find the best seal for your application. In many cases the combination of different sealing systems provides the perfect solution....

GMN Labyrinth Metal Seals Type L and M Against splashing liquids for rotating shafts and housings Type M with drain grooves Against heavy splashing liquids (optimized back transport) for rotating shafts only

Technical data Material Outer ring: Aluminium (GD AlSi 12) Inner ring: Non-alloy steel Design Shaft diameter: Width: Gap height: Sealing gap: Axial clearance: 15-210 mm 10, 14, 15, 20, 22 mm (depending on size) Constantly 0.2 -0.5 mm (Depending on size) Horizontal Sax (see table of dimensions) = total axial movement of the seals inner and outer ring in relation to each other; from one end position to the other. Increased axial clearance: Radial clearance: Type M On request all types are also available with increased axial clearance: S ’= 1.5 xS ax ax (order example: LdxDxB with increased axial...

ID = Inner diameter [mm] W = Width [mm] c = Groove width [mm] Sax = Axial clearance [mm] OD = Outer diameter [mm] e = Gap diameter [mm] Max. speed [rpm] Weight [kg]

GMN Labyrinth Plastic Seals Type S and SA Against normal splashing liquids For rotating shafts and housings Type SA with drain groove Against heavy splashing liquids For rotating shafts only (increased back transport)

Labyrinth Plastic Seals Type S and SA Technical Data Characteristics Material Outer- and inner ring: high quality Polyoxymethylene plastic (POM) Temperature range: Design Shaft diameter: Width: Sealing gap: Axial clearance: Greased seals: -40o-140oF (-40o-60oC) special design with O-ring up to 170oC (80oC) 10-160 mm (customized solutions available upon request) 10, 12, 15 mm (depending on size) Conical S = 0.8 mm ax Total axial movement of the seals inner and outer ring in relation to each other from one end position to the other. Heavy and direct splashing liquids could be drained through an...

Weight Type Part name Type Part name Weight Type Part name Type Part name ID = Inner diameter [mm] OD = Outer diameter [mm]

General information Standard assembly Face-mounting with pre-assembled bearing Assembly inside the unit When installing a GMN Non-Contact Seal, one must be certain that both the inner and outer races are axially aligned. Furthermore, the races need to be unrestricted by any shoulder, nut(s), and/or other restrictions from axial movement. Non-Contact Seal (metal) Type L Non-Contact Seal (plastic) Type S Surrounding construction An additional disc in front of the seal protects the gap against strong and direct splashing liquids. The disc should be assembled in front of the seal with sufficient...