Merkel PTFE U-rings for high level applications Product information Merkel PTFE U-rings
Simrit, Your Global Technology Specialist for Seals and Vibration Control Simrit, Your Global Technology Specialist for Seals and Vibration Control offers you a complete service package. A unique range of products and services guarantees you numerous advantages over the competition. Simrit acts as a partner to general industry. Its position as a market leader is achieved through continuous research, development and manufacture. We have the world s widest range of seals and vibration control products, and can offer you solutions based on the demands of state-of-the-art-technology, solutions which set standards. This way we secure competitive advantages for you based on experience all around the world: Simrit has a presence throughout Europe, America and Asia, either directly or through its affiliated companies NOK (Japan) or Freudenberg-NOK (USA). The transfer of knowledge between these markets is incorporated directly into the Simrit service package. With our many Simrit Service Centres and Simrit distribution Partners, we serve and supply more than 100,000 customers worldwide. Our Simrit Partners ensure rapid availability from stock. This means spare parts quickly arrive when and where they are needed. There is a Simrit Partner near you as well. Make the most of Simrit s service package and give yourself a real competitive edge: Constant innovations Uniquely wide range of products Strong product brands Unique materials expertise A wide range of value added services Simrit offers a complete package of products and services, including leading brands such as Simmerring, Merkel, Integral Accumulator, Lederer and ISC O-Ring. Vibration Control Special Sealing Products: Bellows, Diaphragms, Elastomer Composite Parts and Precision Mouldings Lederer Liquid Silicone Products ISC O-Ring Integral Accumulator Merkel Hydraulics / Pneumatics Simmerring 2
Merkel PTFE U-rings, practical in a wide range of applications PTFE U-rings are designed to be pressurised from one side. A metal spring acts as a pre-load component of the sealing lips and prevents the loss of contact pressure due to thermal expansion. In operation the pre-load of the metal spring is overridden by the system pressure. Benefits of Merkel PTFE U-rings Smaller housing space Variants available for high pressures and vacuum; optimised versions for lifting, rotary and pivoting motion and for static applications Universal chemical resistance due to PTFE basic materials and springs made of non-rust CrNi steel Wide temperature range Good dry-running characteristics possible thanks to application specific selection of most suitable PTFE compounds Spring variants with different spring characteristic curves influence the friction force at the sealing lip. No occurrence of stick-slip Resistance to ageing High functional reliability due to the permanent elasticity of the metal spring Examples of use Valve engineering General chemicals Mechanical engineering Food processing industry Pharmaceuticals Petrochemicals e.g.: ball valves, flanges/lids, screwed connections, rotary joints and distributors, hot water and steam valves, valve spigots, control shafts, reciprocating pumps, mounts Delivery forms PTFE U-rings are supplied with three different types of spring: V-spring Bridges gap and tolerances with relatively large spring displacement Soft spring characteristic curves for minimum friction forces Dimensions permit usage in O-Ring housings (without NRVD-9489) Can be used in U-rings for dynamic and static applications U-ring versions for radial/axial direction of action, also available as rotary seals Special version with protected spring Spring force Round spring High spring force with relatively low spring displacement A special U-ring design distributes the force over several sealing lips Can be used in U-rings for dynamic and static applications U-ring versions for radial/axial direction of action U-spring Bridges sizeable gaps and bearing play with increased spring rate in conjunction with relatively large spring displacement Can be used in U-rings for dynamic and static applications Version with protected spring (NRVR-9499) Maximum resistance to media and sterile spring version provides for sole usage between axial sealing surfaces (flanges, lids, rotary joints) Types of spring and their characteristic curves (diagram) Spring displacement 3
Delivery forms If universal resistance to media is not a priority, O-Rings made of elastomer materials can be used in place of metal springs. Use with high pressures and/or a large gap behind the seal at the same time makes it necessary to use back-up rings with a special geometry for the application. The version with a metal locking ring is often chosen to produce housings with relatively little effort. When using the U-ring version for rotation, the locking ring is the most reliable way of preventing twisting. The correct sealing type as a function of the installation situation Version Pressure direction axial Pressure direction radial V-spring Round U-spring V-spring Round U-spring spring spring Dynamic sealing NRVI-9492 NRVD-9489 lip inside (rod) NRRI-9442 Dynamic sealing NRVA-9490 NRRA-9474 lip outside (piston) Seal open inwards NRVR-9494 NRRR-9459 NRVR-9486 (pressure mode) NRVR-9499 Seal open outwards NRVR-9493 NRRR-9485 NRVR-9487 (vacuum) The correct sealing type as a function of the installation situation Version Covers/ Rotating Rotating Journals flanges and swiveling joints and spindles movements NRVA-9490 NRVR-9494 V-spring NRVR-9493 NRVD-9489 NRVI-9492 NRRA-9474 NRRR-9459 Round spring NRRR-9485 NRRI-9442 NRVR-9487 U-spring NRVR-9486 NRVR-9499 = very well suited = well suited 4
Standard materials of Merkel U-rings PTFE, pure PTFE-pure, modified PTFE/glass fibre PTFE/carbon PTFE/carbon fibre PTFE/glass/molybdenum PTFE/Ekonol PTFE/aramide UHMW PE (polyethylene) PEEK Spring materials 1.4310 (AISI 301) 2.4711 (Elgiloy) For our PTFE products only uncut materials are used as semi finished products. This means that the mechanical loading capacity is not impaired by the addition of PTFE ground material that has already been sintered. Virtually all compounds are also available on the basis of modified PTFE. Benefits can be seen in an improved incorporation of fillers and thus also further improvement in the mechanical loading capacity as well as the reduced diffusion of media along the filler surfaces. Duty Limits Pressure Temperature Sliding speed Dynamic Static Oscillating Rotating < 45 MPa < 120 MPa -200 to 260 C < 10 m/s < 2.5 m/s Surface Quality Roughness depth R a Sealing surfaces, dynamic/static see diagram Lead-in bevels* < 1.6 µm Groove edge* < 2.5 µm * Rounded edges burr-free For dynamic sealing the aim is surfaces with a high percentage contact area (tpi 50-90% with 50% cutting depth Rz/2). From 25 MPa (depending on the gap width, temperature, pressure, material) or also with gaps caused by the expansion of components it may be necessary to use back-up rings. When considering the operating parameters listed, please bear in mind that they stand in relation to each other and represent maximum values. Please agree the type of seal and permissible maximum values with us in relation to your application. Average roughness height Ra of the sealing surface Ra max. 1.5 1.0 0.5 0.1 Hydrogen Steam Air motor oils SAE 10-50 Water Grease Bitumen Dust Granules static dynamic gaseous liquid solid State of aggregation of the medium Achievable surface quality as a function of production process, see DIN 4766 5
Contact area hardness HRC 20-65 The hardness of the contact area is a key factor for the functionality of the seal. For many applications standard constructional, tempering and hardened steel also offer a sufficient level of surface hardness. A minimum hardness penetration depth, (see installation data) of 300 µm should be observed. Otherwise a relatively soft shaft material may give way under the hardening layer, something which may quickly destroy a seal. In principle, the hardest material that is practical in technical terms should be used. Housing tolerances See article lists Fitting instructions Installation preferably in axially accessible grooves. If clipping or snapping in position is necessary, e.g. in half-enclosed housings, please consult our application engineers. Please remember rods and housings should be installed at an angle. Please avoid sharp edges. Lightly oil components before fitting. Housings must be clean and free of foreign bodies. The dependence on the following items should also be borne in mind: type of movement running speed media (lubricating, abrasive, dry running) sealing material (hard, soft) temperature pressure 6
U-rings with V-shaped spring Dimensional recommendation U-ring NRVI-9492 Standard material PTFE-carbon Spring material 1.4310 (AISI 301). Sealing lip inside, dimensions can be replaced by O-Rings as per AS 568A, installation identical to MIL-5514 Range of dimensions d available S H L C from to >10 20 2.25 3.1 3.6 >1.0 >20 40 3.10 4.3 4.8 >1.2 >40 150 4.70 6.5 7.1 >1.5 >150 2000 6.10 8.5 9.5 >2.0 The following dimensional recommendations are in addition to our article lists. They are used when the article lists do not contain suitable sizes. 7
Article list U-ring NRVI-9492 Article No. d D S H L PTFE-carbon/1.4310 10 14.5 2.25 3.1 3.6 24316031 12 16.5 2.25 3.1 3.6 24316032 14 18.5 2.25 3.1 3.6 24316033 15 19.5 2.25 3.1 3.6 24316034 16 20.5 2.25 3.1 3.6 24316035 18 22.5 2.25 3.1 3.6 24267655 20 24.5 2.25 3.1 3.6 24316036 22 28.2 3.10 4.3 4.8 24316011 25 31.2 3.10 4.3 4.8 24316012 28 34.2 3.10 4.3 4.8 24316013 30 36.2 3.10 4.3 4.8 24316014 32 38.2 3.10 4.3 4.8 24316015 35 41.2 3.10 4.3 4.8 24316016 36 42.2 3.10 4.3 4.8 24316017 40 46.2 3.10 4.3 4.8 24316018 42 51.4 4.70 6.5 7.1 24315981 45 54.4 4.70 6.5 7.1 24315982 50 59.4 4.70 6.5 7.1 24315479 55 64.4 4.70 6.5 7.1 24315983 56 65.4 4.70 6.5 7.1 24315984 60 69.4 4.70 6.5 7.1 24315985 63 72.4 4.70 6.5 7.1 24315986 65 74.4 4.70 6.5 7.1 24315987 70 79.4 4.70 6.5 7.1 24315988 75 84.4 4.70 6.5 7.1 24315989 80 89.4 4.70 6.5 7.1 24315990 85 94.4 4.70 6.5 7.1 24315973 90 99.4 4.70 6.5 7.1 24315974 100 109.4 4.70 6.5 7.1 24315975 110 119.4 4.70 6.5 7.1 24315976 115 124.4 4.70 6.5 7.1 24315977 125 134.4 4.70 6.5 7.1 24315978 140 149.4 4.70 6.5 7.1 24315979 150 159.4 4.70 6.5 7.1 24315980 160 172.2 6.10 8.5 9.5 24315967 180 192.2 6.10 8.5 9.5 24315968 200 212.2 6.10 8.5 9.5 24315969 8
Dimensional recommendation U-ring NRVA-9490 Standard material PTFE-carbon Spring material 1.4310 (AISI 301). Sealing lip outside Dimensions can be replaced by O-Rings as per AS 568A, installation identical to MIL-5514 Range of dimensions D available S H L C from to >15 25 2.25 3.1 3.6 1.0 >25 45 3.10 4.3 4.8 1.2 >45 155 4.70 6.5 7.1 1.5 >155 2000 6.10 8.5 9.5 2.0 9
Article list U-ring NRVA-9490 Artcle No. D d S H L PTFE-carbon/1.4310 15 10.5 2.25 3.1 3.6 24297797 16 11.5 2.25 3.1 3.6 24315800 18 13.5 2.25 3.1 3.6 24315802 20 15.5 2.25 3.1 3.6 24315803 22 17.5 2.25 3.1 3.6 24315804 25 20.5 2.25 3.1 3.6 24315805 28 21.8 3.10 4.3 4.8 24315868 30 23.8 3.10 4.3 4.8 24315869 32 25.8 3.10 4.3 4.8 24315783 35 28.8 3.10 4.3 4.8 24315870 36 29.8 3.10 4.3 4.8 24315871 40 33.8 3.10 4.3 4.8 24315872 42 35.8 3.10 4.3 4.8 24315873 45 38.8 3.10 4.3 4.8 24315874 50 40.6 4.70 6.5 7.1 24315816 55 45.6 4.70 6.5 7.1 24315817 56 46.6 4.70 6.5 7.1 24315818 60 50.6 4.70 6.5 7.1 24315819 63 53.6 4.70 6.5 7.1 24315820 65 55.6 4.70 6.5 7.1 24315821 70 60.6 4.70 6.5 7.1 24315822 75 65.6 4.70 6.5 7.1 24315823 80 70.6 4.70 6.5 7.1 24315824 85 75.6 4.70 6.5 7.1 24306946 90 80.6 4.70 6.5 7.1 24315825 100 90.6 4.70 6.5 7.1 24315826 110 100.6 4.70 6.5 7.1 24315827 115 105.6 4.70 6.5 7.1 24315828 125 115.6 4.70 6.5 7.1 24315829 140 130.6 4.70 6.5 7.1 24315830 150 140.6 4.70 6.5 7.1 24315831 160 147.8 6.10 8.5 9.5 24315908 180 167.8 6.10 8.5 9.5 24315910 200 187.8 6.10 8.5 9.5 24315911 10
Dimensional recommendation U-ring NRVR-9494 Range of dimensions d available B L S from to 30 150 3.1 2.25 3.6 50 500 4.3 3.10 4.8 70 1000 6.5 4.70 7.1 100 1400 8.5 6.10 9.5 Dimensional recommendation U-ring NRVR-9493 Range of dimensions d available B L S from to 40 250 3.1 2.25 3.6 50 500 4.3 3.10 4.8 70 1000 6.5 4.70 7.1 100 1400 8.5 6.10 9.5 11
Dimensional recommendation U-ring NRVD-9489 Range of dimensions d available S H D 4 L 2 L 3-0,1 C from to 10 20 2.50 3.1 d+ 9.0 +0.15 3.6 0.85 1.0 >20 40 3.50 4.3 d+12.5 +0.2 4.8 1.35 1.2 >40 200 5.25 6.5 d+17.5 +0.3 7.1 7.80 1.5 12
U-rings with U-spring Dimensional recommendation U-ring 9487 Available dimensional range Range of dimensions d available B L* S from to from to 60 1400 11.5 10.0 13.0 B+0.5 75 1400 14.5 12.0 15.0 B+0.5 100 1400 17.0 14.0 18.0 B+1.0 150 1400 20.0 17.5 21.0 B+1.0 * medium heights should be preferably used Dimensional recommendation U-ring NRVR9486 and U-ring NRVR-9499 Range of dimensions D available B L* S from to from to 60 1400 11.5 10.0 13.0 B+0.5 75 1400 14.5 12.0 15.0 B+0.5 100 1400 17.0 14.0 18.0 B+1.0 150 1400 20.0 17.5 21.0 B+1.0 * medium heights should be preferably used 13
U-rings with round spring Dimensional recommendation U-ring NRRI-9442 Standard material PTFE-carbon and PTFE/glass/MoS2 Spring material 1.4310 (AISI 301). Sealing lip inside, dimensions suitable for housings as per DIN ISO 5597 (rod seal) Range of dimensions d available S H L C from to 10 70 3.0* 4.2 4.7 >2 12 100 4.0* 5.0 5.5 >2 12 200 5.0* 7.5 8.0 >3 20 300 6.0 8.0 8.5 >3 40 500 7.5 11.0 11.5 >3 50 1000 10.0 15.0 15.5 >4 70 1400 12.5 8.0 18.5 >4 100 1400 15.0 22.5 23.0 >5 100 2000 20.0 30.0 30.5 >6 * with a profile dimension > 5 mm one sealing edge The following dimensional recommendations are in addition to our article lists. They are used when the article lists do not contain suitable sizes. 14
Article list U-ring NRRI-9442 Article No. d D S H L PTFE/glass/ PTFE-carbon/ MoS2/1.4310 1.4310 12 20 4.0 5.0 5.5 24168696 24315601 12 22 5.0 7.5 8.0 24151581 24161103 14 22 4.0 5.0 5.5 24164130 24161326 16 24 4.0 5.0 5.5 24233728 24159482 18 28 5.0 7.5 8.0 24314093 24315599 20 28 4.0 5.0 5.5 24216344 24203310 20 30 5.0 7.5 8.0 24156032 24168974 20 32 6.0 8.0 8.5 24314101 24315614 22 32 5.0 7.5 8.0 24151794 24315572 25 35 5.0 7.5 8.0 24314095 24266496 28 38 5.0 7.5 8.0 24204174 24315573 28 43 7.5 11.0 11.5 24314130 24291760 32 42 5.0 7.5 8.0 24314097 24315574 36 46 5.0 7.5 8.0 24314098 24315575 40 50 5.0 7.5 8.0 24203543 24292110 40 55 7.5 11.0 11.5 24202938 24291467 45 55 5.0 7.5 8.0 24151825 24267237 50 60 5.0 7.5 8.0 24168144 24296137 50 65 7.5 11.0 11.5 24151830 24240928 56 71 7.5 11.0 11.5 24314132 24315646 56 76 10.0 15.0 15.5 24314195 24315674 63 78 7.5 11.0 11.5 24314134 24315647 70 85 7.5 11.0 11.5 24314136 24315648 70 90 10.0 15.0 15.5 24167957 24315675 80 95 7.5 11.0 11.5 24314140 24315650 80 100 10.0 15.0 15.5 24203458 24168519 90 105 7.5 11.0 11.5 24314142 24315651 90 110 10.0 15.0 15.5 24204970 24155751 100 120 10.0 15.0 15.5 24217881 24168754 110 130 10.0 15.0 15.5 24163084 24233246 125 145 10.0 15.0 15.5 24232697 24315676 125 150 12.5 18.0 18.5 24314200 24315688 140 160 10.0 15.0 15.5 24314198 24315677 160 185 12.5 18.0 18.5 24314201 24315689 160 190 15.0 22.5 23.0 24155969 24315696 180 205 12.5 18.0 18.5 24314202 24315690 180 210 15.0 22.5 23.0 24314213 24315697 200 225 12.5 18.0 18.5 24314203 24315691 200 230 15.0 22.5 23.0 24314214 24315698 220 250 15.0 22.5 23.0 24314215 24315699 250 280 15.0 22.5 23.0 24314216 24315700 280 310 15.0 22.5 23.0 24314217 24315701 15
Dimensional recommendation U-ring NRRA-9474 Range of dimensions D available S H L C from to 16 70 3.0* 4.2 4.7 >2 23 100 4.0* 5.0 5.5 >2 30 200 5.0* 7.5 8.0 >3 42 300 6.0 8.0 8.5 >3 55 500 7.5 11.0 11.5 >3 70 1000 10.0 15.0 15.5 >4 95 1400 12.5 18.0 18.5 >4 130 1400 15.0 22.5 23.0 >5 140 2000 20.0 30.0 30.5 >6 * with a profile dimension > 5 mm one sealing edge Article list U-ring NRRA-9474 Article No. d D S H L PTFE-glass/ PTFE-carbon MoS2/1.4310 1.4310 50 40 5.0 7.5 8.0 24314272 24316338 63 48 7.5 11.0 11.5 24314273 24316376 80 60 10.0 15.0 15.5 24314269 24316379 100 80 10.0 15.0 15.5 24312040 24316380 125 100 12.5 18.0 18.5 24314275 24316340 160 135 12.5 18.0 18.5 24314276 24316341 200 170 15.0 22.5 23.0 24314277 24316344 225 195 15.0 22.5 23.0 24314278 24316345 250 220 15.0 22.5 23.0 24314279 24316346 280 250 15.0 22.5 23.0 24314280 24316347 320 290 15.0 22.5 23.0 24314281 24316348 16
Dimensional recommendation U-ring NRRR-9459 Standard material PTFE-carbon and PTFE/glass/MoS2 Spring material 1.4310 (AISI 301). Sealing lip outside, dimensions suitable for housings as per DIN ISO 5597 (piston seal) Range of dimensions D available B L S from to 25 70 4.2 3.0 4.7 30 100 5.0 4.0 5.5 50 200 7.5 5.0 8.0 60 300 8.0 6.0 8.5 80 500 11.0 7.5 11.5 100 1000 15.0 10.0 15.5 150 1400 18.0 12.5 18.5 250 1400 22.5 15.0 23.0 500 1400 30.0 20.0 30.5 Dimensional recommendation U-ring NRRR-9485 Range of dimensions d available B L S from to 15 70 4.2 3.0 4.7 20 100 5.0 4.0 5.5 35 200 7.5 5.0 8.0 45 300 8.0 6.0 8.5 60 500 11.0 7.5 11.5 70 1000 15.0 10.0 15.5 115 1400 18.0 12.5 18.5 200 1400 22.5 15.0 23.0 440 1400 30.0 20.0 30.5 17
From a standard design to an individual solution The standard models described above cover the requirements made on seals in the case of most applications. However, there are other applications which call for a customised solution. This may involve a requirement for increased performance in terms of dynamic properties and functional reliability with frequently recurring thermal loads with high temperature gradients. Product optimisation and the simplification of components may be necessary with one or more operating parameters. Examples of requirements requirement for simplified design of housings no additional measures involving prevention of twisting or fixing constant heat influence in temperature range from 100 150 C special requirements on PTFE turned part in cooling phase and during downtimes Solution involving integrated functional elements Consideration of the functional elements of a rotary shaft seal and combination with the functional elements of a U-ring offer the following solution in line with the requirements: PTFE U-ring with optimised sealing lip geometry for rotation Metal spring for constant contact pressure of the sealing lip on the surface of the shaft, in particular to compensate for expansion caused by heat. Fixing, prevention of twisting and sealing from the housing by use of clamping ring technology. Benefits resulting from the development of seals in line with these requirements high functional reliability universal chemical resistance cost benefit regarding design of housing simplified storage due to standardisation of range Whether tried and tested standard versions or individual sealing solutions optimised according to the application; we have the right solution for every application. 18
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Product information Merkel PTFE U-rings Simrit, Your Global Technology Specialist for Seals and Vibration Control Simrit Services Your Benefits Constant innovations Technological edge Uniquely wide range of products All from one source Strong product brands Specialised technological expertise Unique materials expertise Longer unit service life A wide range of value added services Competitive advantages, efficiency and lower costs e.g. Merkel PTFE U-rings for high level applications Your Benefits Smaller housing space Wide temperature range No stick-slip Vibration Control Special Sealing Products: Bellows, Diaphragms, Elastomer Composite Parts and Precision Mouldings Lederer Liquid Silicone Products ISC O-Ring Integral Accumulator Merkel Hydraulics / Pneumatics Simmerring Headquarters Europe: Freudenberg Simrit KG 69465 Weinheim, Germany Phone +49 (0) 18 05 - Simrit Phone +49 (0) 18 05-74 6748 Fax +49 (0) 18 03-74 6748 e-mail: info@simrit.de www.simrit.com 20 GB 334 1.0 0305 D&S. ABT