Issue 1 Spring-energised engineered plastic seals Spring-energised for high capability sealing Low friction for smooth operation Static, rotary & reciprocating applications Excellent performance at high & low pressures Wide temperature range High Performance Sealing Technology
spring-energised seals With the range, James Walker provides industry worldwide with the high-performance answer to fluid sealing problems where conventional products fail to give the integrity or reliability required. Spring-energised seals are far from new we have been manufacturing them since the 1940s. But we now offer a full range of Unilion precision-engineered products that meet the following parameters: Used successfully on applications at up to 103MPa/15,000psi. Cryogenic duties down to -260 C. Temperature excursions up to +300 C. Resistance to corrosive media. Efficient dynamic operation following long stationary periods. Based on these operational benefits, we recommend Unilion for applications that preclude the use of more conventional elastomeric/polymeric seals on arduous duties in areas such as: Oil and petrochemical. Cryogenic plant. Aerospace. Food and pharmaceutical processing. Automotive and general industry. Moreover, Unilion seals have no storage period limitation. They can safely be held in stock on-site to meet OEM and maintenance requirements. As a single Unilion can often perform three sealing duties static, reciprocating and rotary this can also reduce your stockholding requirements and simplify inventory control. Contents Page Unilion introduction 3 Seal jacket materials 4-5 Seal spring materials 6 Unilion seal diameter details 6 Seal technical details 7 Unilion types J01 to J10 standard profiles 8 Unilion types J20 to J29 standard profiles 9 Unilion types J30 & J31 standard profiles 10 How to order/specify your seals 10 Unilion back-up rings 11 Hardware design Rod sealing 12 Hardware design Piston sealing 13 Hardware design Rod or shaft sealing with flange 14 Hardware design Axial sealing 15 Appendix 1: Unilion Fitting Guide 16-17 Appendix 2: Engineering in Fluolion PTFE 18-19 Unilion enquiry form 20-21 Technical guides 22 General information 23 James Walker worldwide support & distribution 24 2 To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz
introduction Background to success James Walker has vast experience of working with PTFE and engineering polymers to exacting specifications. We have been solving industry s fluid sealing problems by the design, development and manufacture of products in these materials since 1948, when PTFE was classed as a strategic material and available only on a special licence from the USA. Since then, our research and development teams have identified prime roles for fluoropolymers and other engineering polymers in high integrity seals for static and dynamic mechanisms that need to operate in the harshest of environments. Our chemists and engineers regularly push back the boundaries of materials technology to develop new techniques for making, forming and machining polymers.. How the seal works seals are based on the U ring principle. The lips of each seal are initially energised by corrosion resistant metal springs of helicoil, U spring, or U finger spring design, according to the seal type. Helicoil spring U finger spring Full contact spring The spring energises the Unilion seal by providing resilience to the PTFE lips. This radial stress keeps the sealing lips in contact with the shaft/piston and cylinder before system pressure is applied. It also compensates for any slight eccentricity cause by misalignment in the equipment, manufacturing tolerances, bedding-in wear or thermal movement. When applied, the system pressure enhances the spring action and increases fluid sealing efficiency. Thus radial stress always exceeds the pressure to be sealed. The flat heel of the seal sits firmly in the machined housing groove to keep the lips set at the correct angle for efficient operation. The expertise for this exacting work is vested in our sites near Greenock, Scotland and Antwerp, Belgium. At these locations, we have technologists, skilled workforces and specialised plant all dedicated to PTFE and engineering plastics. Our manufacturing capabilities range from prototype development to large scale production using fully automated CNC machinery required for achieving the precision needed for production. spring energised Spring & pressure energised The result is a long-life, low-friction seal with negligible leakage even under physically demanding operating conditions involving highly corrosive fluid media. 3 To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz 3
seal jacket materials Material name and description Jacket material code Colour Applications Temperature range continuous use ( C) Fluolion 01 Virgin PTFE 01 White Excellent for light dynamic and static service. Low gas permeability. Good cryogenic properties. Conforms to FDA 21 CFR 177.1550. -250 to +260 Fluolion 02 PTFE/inorganic filler 02 Blue Similar properties to Fluolion 01, but with improved wear resistance. -260 to +260 Fluolion 03 PTFE/carbon/graphite 03 Black Excellent material for heat and wear resistance. Recommended for dry and poorly lubricated applications. Suitable for duties in water and steam. -250 to +260 Fluolion 05 PTFE/carbon/graphite 05 Black Similar to Fluolion 03, but offers superior wear resistance. Excellent in steam and water under severe conditions. Very good extrusion resistance at high temperature. Excellent for back-up rings. -250 to +260 Fluolion 06 PTFE/carbon/MoS 2 06 Black Excellent for extreme dynamic conditions, with combinations of high temperature, pressure, speed, and dry running. Excellent in water and water-based solutions. Abrasive when running against soft metal counterfaces. -250 to +260 Fluolion 07 PTFE/bronze 07 Brown Excellent in reciprocating hydraulic applications: not recommended for rotary use. Good for high pressure applications. Good abrasion resistance. -150 to +260 Fluolion 08 PTFE/polymer 08 Light brown Special grade for high temperature applications. Recommended for low to medium speed applications running against soft metals. -240 to +260 Fluolion 09 PTFE/aromatic polyester 09 Brown Special grade with superior heat and wear resistant characteristics. Non-abrasive; recommended for low to high speed applications running against soft metals. Not recommended for use in water. -250 to +260 UHMWPE 10 White Fluolion 11 PTFE/glass/MoS 2 11 Grey Excellent low-wearing material, being highly abrasive resistant. This sturdy material offers limited heat and chemical resistance. Ideal for improved sealing at lower pressures. Can be abrasive when running against soft metal counterfaces. -250 to +80-250 to +260 Fluolion 12 PTFE/graphite 12 Black General purpose grade with good heat and wear resistance. Good in water and non-lubricating fluids; compatible with all common hydraulic fluids and most chemicals. -250 to +260 4 To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz
seal jacket materials Material name and description Jacket material code Colour Applications Temperature range continuous use ( C) PEEK 13 Light brown A high modulus material with excellent high temperature resistance. Used for anti-extrusion and other support rings. -70 to +260 Fluolion 15 PTFE/inorganic filler 15 White Food-compatible filled PTFE. Typically used for bearing/ support ring duties. -250 to +260 Fluolion 18 PTFE/glass filler 18 Off-white Higher modulus material ideal for anti-extrusion support rings. Can be abrasive when running against soft metal counterfaces. -250 to +260 Fluolion 22 Modified PTFE 22 White Excellent for static and intermittent dynamic applications. Particularly good at cryogenic applications. Conforms to FDA requirements. -260 to +260 Fluolion 22C Modified PTFE/25% carbon 22C Black Similar to Fluolion 22, but offers increased wear resistance. Excellent for extreme dynamic applications with combinations of high temperature, pressure, speed, and dry running. -260 to +260 PCTFE 28 Colourless High mechanical strength, chemical resistance and low shrinkage rate at low temperatures makes this material ideal for cryogenic applications. -250 to +160 POM 30 White The combination of high strength and low coefficient of friction results in POM being perfectly suited as a material for bearings, bushes and guide bands. -50 to +100 Other material compounds are available on request to meet specific applications, for example Norsok M-710 approved grades. To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz 5
seal spring materials spring-energised seals are available with a selection of spring designs and materials. The materials are compatible with most media. Other spring materials are available, but minimum production quantities may be required. If necessary, please contact James Walker for advice regarding your specific applications. Spring material code Material description Types J01 to J10 Types J20 to J29 Types J30 & J31 01 301 stainless steel Optional Standard 02 Corrosion resistant cobalt alloy Standard Standard Full specifications for these materials are available on request. Alternative alloys are available on request to meet specific applications, for example NACE approved grades. seal diameter details Types J01 to J08 Types J09, J10 + J28, J29 Types J20 to J27 Types J30, J31 Cross Section Code Minimum rod diameter Minimum bore diameter Cross Section Code Minimum ID Minimum OD Cross Section Code Minimum rod diameter Minimum bore diameter Cross Section Code Minimum ID 1 2 5 1 6 10 1 5 8 3 20 26 2 4 9 2 12 15 2 10 15 4 40 45 3 7 13 3 20 28 3 12 18 5 85 95 Minimum OD 4 15 25 4 45 50 4 16 25 6 100 120 5 60 72 5 85 96 5 65 77 7 120 150 6 85 105 6 100 110 6 100 120 - - - All dimensions in mm For diameters outside the ranges quoted, please contact the James Walker Technical Support Team. 6 To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz
seal technical details is a spring-actuated and pressure-assisted sealing device comprising a thermoplastic jacket and a corrosion-resistant metal spring. When the Unilion is seated in a gland, the spring will be in compression forcing the jacket against the hardware. The spring compensates for jacket wear and eccentricity. The system pressure assists the spring pressure. The spring load can be tailored to meet special low friction requirements in dynamic applications, and loading can be increased for cryogenic sealing duties where thermal contraction of the seal may be an issue. Temperature, pressure and extrusion gap Graph for guidance only MPa / bar Material 70 / 700 Pure PTFE 0.10 0.07 0.05-60 / 600 Filled PTFE 0.15 0.10 0.07 - L0 width 50 / 500 Pure PTFE 0.15 0.10 0.07-40 / 400 Filled PTFE 0.20 0.15 0.10 0.07 L1 width 30 / 300 Filled back-up 0.20 0.15 0.10 0.07 20 / 200 PEEK back-up 0.20 0.15 0.10 0.07 L2 width 10 / 100 Filled back-up 0.25 0.20 0.15 0.10 0 PEEK back-up 0.35 0.25 0.20 0.15-100 -50 0 50 100 150 200 250 L2 width Temperature C All dimensions in mm If application conditions fall outside the specified range, please contact the James Walker Technical Support Team. Maximum recommended diametral extrusion gap When sealing at high pressure and/or high temperature, the clearance between the hardware extrusion gap becomes highly significant. In these conditions, the jacket material can extrude into the gap causing premature sealing failure. The extrusion gap should be held to the minimum practical and ideally should not exceed the values shown above. For these reasons the anti-extrusion rings are manufactured of a harder material than the seal jackets. Surface finishes and hardness Dynamic sealing The quality of the surface finish influences the relative wear of the jacket material. The transfer of a thin film of PTFE from the seal jacket to the mating dynamic surface will improve seal life. Relatively rough finishes wear the jacket material too rapidly, whereas smooth surfaces can result in insufficient material transfer to form the thin film. As a general rule, the higher the sealing surface hardness the better the seal performance. Greater hardness reduces wear and increases seal life. A 40 HRC or higher value is recommended for slow to moderate movements. Ensure that the seal s counterfaces are free from scores and spiral machining marks. Static sealing Ensure that the seal s counterfaces are free from scores and spiral machining marks. Fluid being sealed Surface finish Dynamic surface Static surface Cryogenics 0.05 to 0.2 Ra 0.1 to 0.2 Ra Helium gas Hydrogen gas Air Nitrogen gas Argon gas Natural gas Petrol Water Hydraulic fluid Crude oil Greases All dimensions in µm 0.05 to 0.2 Ra 0.15 to 0.3 Ra 0.15 to 0.4 Ra 0.3 to 0.8 Ra 0.2 to 0.4 Ra 0.4 to 1.6 Ra To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz 7
types J01 to J10 Standard profiles Radial seals Type Features Type J01 J03 J05 Radial seal for static and dynamic duties; suitable as rod or piston seal. Medium to high spring load for positive sealing, but with some friction. Suitable for service with medium to high system pressure. Type J01: Standard profile Type J02: As J01, but with extended heel for higher pressure service. As Type J01, but for reciprocating action only. Contains scraper lip on inside diameter. Type J03: Standard profile. Type J04: As J03, but with extended heel for higher pressure service. As Type J01, but for reciprocating action only. Contains scraper lip on outside diameter. Type J05: Standard profile. Type J06: As J05, but with extended heel for higher pressure service. J02 J04 J06 J07 Radial flange seals As Type J01, but has flange that is clamped to prevent undesirable movement of the seal. Rotation can occur with standard designs, due to thermal expansion. J08 As Types J01 and J07, but for reciprocating action only. Contains scraper lip on inside diameter. Axial seals J09 Axial seal for static applications as in Type J01. Used as an internal face seal. J10 Axial seal for static applications as in Type J01. Used as an external face seal. 8 To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz
types J20 to J29 Standard profiles Radial seals Type Features Type J20 J22 J24 Radial seal for dynamic duties as rod or piston seal. Low spring load and high deflection provides low friction sealing and compensates for minor eccentricity or misalignment. Suitable for service with low to medium system pressure and/or speed. Type J20: Standard profile. Type J21: As J20, but with extended heel for higher pressure service. As Type J20, but for reciprocating action only. Contains scraper lip on inside diameter. Type J22: Standard profile. Type J23: As J22, but with extended heel for higher pressure service. As Type J20, but for reciprocating action only. Contains scraper lip on outside diameter. Type J24: Standard profile. Type J25: As J24, but with extended heel for higher pressure service. J21 J23 J25 J26 Radial flange seals As Type J20, but has flange that is clamped to prevent the seal rotating with the shaft. Rotation can occur with standard designs, due to thermal expansion and other effects with dynamic applications. J27 As Types J20 and J26, but for reciprocating action only. Contains scraper lip on inside diameter. Axial seals J28 Axial seal for static or dynamic applications as in Type J20. Used as an internal face seal. J29 Axial seal for static or dynamic applications as in Type J20. Used as an external face seal. To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz 9
types J30 & J31 Standard profiles Our axial face seals Type J30 and J31 contain a heavy duty, higher load spring. We recommend these seals for extreme static sealing conditions. Axial seal for internal pressure: J30 Axial seal for external pressure: J31 Note: please specify OD for J30, and ID for J31. How to order/specify your seal Please follow the Order example as shown below, and quote your equivalent of the seal designation: J02 3 1-01250- 03 02 Order example J02 3 1-01250 - 03 02 Product type Cross section code Hardware indicator 0 = Axial seal 1 = Radial shaft seal 2 = Radial piston seal Hardware diameter (eg, 125.0 mm) Seal jacket material Spring material Note that maximum temperature, pressure and speed ratings may not be applied simultaneously. Please consult the James Walker Technical Support Team for recommendations, particularly where applications are close to the recommended performance limits. 10 To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz
back-up rings Solid back-up rings Back-up rings are used in combination with axial and radial seals when the extrusion gap is too large for the required pressure and temperature. Please refer to page 7 for information on the use of these back-up rings (L2 width). For further information, please contact the James Walker Technical Support Team. Bespoke products If a bespoke sealing solution is required, please contact the James Walker Technical Support Team. To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz 11
Hardware design Rod sealing Cross Section Code H Types J01, J02, J03, J04, J05, J06 + J20, J21, J22, J23, J24, J25 ØA (B + 2H) T1 K Min L0 +0.30-0.00 L1 +0.30-0.00 1 1.42 B + 2.84 0.05 3.50 2.40 3.80 5.30 2 2.26 B + 4.52 0.05 4.50 3.60 4.60 6.20 3 3.07 B + 6.14 0.05 6.00 4.80 6.00 7.70 L2 +0.30-0.00 4 4.72 B + 9.44 0.06 7.50 7.10 8.50 10.80 5 6.05 B + 12.10 0.07 8.50 9.50 12.10 14.70 6 9.35 B + 18.70 0.08 10.00 13.50 15.00 18.00 All dimensions in mm L0 L1 L2 ØA (B+2H) +T1/-0.0 ØB Rod +0.0/-T1 12 To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz
Hardware design Piston sealing Cross Section Code H Types J01, J02, J03, J04, J05, J06 + J20, J21, J22, J23, J24, J25 ØA (A - 2H) T1 K Min L0 +0.30-0.00 L1 +0.30-0.00 1 1.42 A - 2.84 0.05 3.50 2.40 3.80 5.30 2 2.26 A - 4.52 0.05 4.50 3.60 4.60 6.20 3 3.07 A - 6.14 0.05 6.00 4.80 6.00 7.70 L2 +0.30-0.00 4 4.72 A - 9.44 0.06 7.50 7.10 8.50 10.80 5 6.05 A - 12.10 0.07 8.50 9.50 12.10 14.70 6 9.35 A - 18.70 0.08 10.00 13.50 15.00 18.00 All dimensions in mm L0 L1 L2 ØA Cylinder ØB +T1/-0.0 (A-2H) +0.0/-T1 To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz 13
Hardware design Rod or shaft sealing with flange Cross Section Code C (±0.15) H Types J07, J08 + J26, J27 ØA (B + 2H) T1 J (±0.15) 1 3.40 1.42 B + 2.84 0.05 0.80 3.50 3.80 2 4.30 2.26 B + 4.52 0.05 0.90 4.50 4.60 3 5.50 3.07 B + 6.14 0.05 1.30 6.00 6.00 4 8.50 4.72 B + 9.44 0.06 1.80 7.50 8.50 K Min L1 +0.30-0.00 5 11.50 6.05 B + 12.10 0.07 2.30 8.50 12.10 6 15.50 9.35 B + 18.70 0.08 3.30 10.00 15.00 All dimensions in mm L1 ØB Rod +0.0/-T1 ØA (B+2H) +T1/-0.0 14 To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz
Hardware design Axial sealing Cross Section Code Types J09, J10 + J28, J29 H T1 T2 L3 +0.30-0.00 1 1.42 0.05 0.13 2.40 2 2.26 0.05 0.13 3.60 3 3.07 0.05 0.15 4.80 4 4.72 0.06 0.15 7.10 5 6.05 0.07 0.20 9.50 6 9.35 0.08 0.20 13.50 All dimensions in mm Cross Section Code Types J30, J31 H T1 T2 L3 +0.30-0.00 3 3.07 0.05 0.15 4.80 4 4.72 0.06 0.15 7.10 5 6.05 0.07 0.20 9.50 6 9.35 0.08 0.25 13.50 7 12.40 0.08 0.30 16.50 All dimensions in mm A DIA +T2/-0.0 B DIA +0.0/-T2 H +T1/-0.0 To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz 15
Appendix 1: Fitting Guide spring-energised PTFE/plastic lip seals. Please read these instructions before starting to fit the seal Fitting techniques should be considered at the design stage of any equipment using spring-energised PTFE lip seals. They cannot be stretched or squeezed into position as easily as elastomeric seals. Take care not to damage or permanently distort the PTFE/plastic element during installation. For Health & Safety reasons, shut down the fluid handling system before installing your new seal. Please wear all required PPE to ensure a safe working environment. Check the seal and seal housing. Ensure that the seal is suitable for the operating parameters of the equipment, and that the seal and housing are the correct sizes. Remove old seal, and thoroughly clean the seal housing and lead-on/lead-in surfaces where seal must pass during installation. Always install a with its open face towards the pressure media to be retained Split-type housings For high-integrity sealing and cryogenic applications, we always recommend the use of a split housing, as it virtually eliminates the need to distort the Unilion during installation. Expose the seal housing cavity by removing the gland follower or retaining plate. Insert the seal fully into the exposed cavity, with the seal's open face towards the system pressure. Ensure the seal is evenly seated around the entire circumference. Replace the gland follower or retaining plate, and carefully reassemble the equipment. A 20 to 30 lead-on/lead-in chamfer is required to ensure that the seal is not damaged when passing the cylinder/bore entrance, or piston head/shaft end. 16 To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz
spring-energised PTFE/plastic seals. Piston with partially enclosed housing Use this method only when the inside diameter of the seal is at least 25 times its nominal radial section. If you require advice on fitting a seal in this housing configuration, please contact the James Walker Technical Support Team technical.unilion@jameswalker.biz. This operation requires a 15 lead-on chamfer to the housing groove from the pressure side of the system. A locking lip of A/4 is needed to ensure the seal seats securely (where A is the nominal radial section of the seal). A/4 15 A To install the seal, gently feed it up the chamfer, with the seal's open face towards the system pressure. Then swiftly press it over the locking lip and into the housing groove, thus minimising any distortion. Partially enclosed cylinder housing Use this method only when the inside diameter of the seal is at least 10 times its nominal radial section. If you require advice on fitting a seal in this housing configuration, please contact the James Walker Technical Support Team technical.unilion@jameswalker.biz. 15 A A/4 This operation requires a 15 lead-in chamfer to the housing groove from the pressure side of the system. A locking lip of A/4 is needed to ensure the seal seats securely (where A is the nominal radial section of the seal). To install the seal, distort it slightly into an ellipse and insert it into the bore, with the seal's open face towards the system pressure. When the back of one quadrant of the seal is located firmly in the housing, feed the remainder of the seal down the 15 lead-in and into the housing. To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz 17
Appendix 2: Engineering in Fluolion PTFE Outstanding properties C F Fillers include the following in varying percentages by weight: Glass fibre Bronze Graphite and/or carbon Molybdenum disulphide (MoS 2 ) Ceramics and mineral oxides Other additives to meet specific requirements. Filler content is typically between 5% and 40% by weight. Below 5% the effect of the filler is usually insignificant. Above 40% the physical properties of the base material are likely to be impaired, except with very high density fillers. Manufacturing techniques Fluolion products are manufactured from prime grades of raw materials obtained from major international suppliers. Polytetrafluoroethylene (PTFE) is a remarkable engineering material that was discovered in 1938 by DuPont (USA) and given the trade name Teflon. Fluolion is the registered trade name for PTFE compounds and material products manufactured to exacting standards by James Walker. Fluolion PTFE has many outstanding physical, chemical and electrical properties that make it invaluable to industry today: Resistance to virtually every known chemical and solvent. Only molten alkali metals, fluorine and some fluorine compounds at elevated temperature will attack it. Lowest coefficient of friction for a solid engineering material. Extremely high electrical resistance. High dielectric strength. Low dielectric constant over a wide frequency range. Extremely wide temperature tolerance: -250 C to over +300 C depending on application circumstances. Ease of machining. Does not support combustion or spread of flame. Excellent weatherability: does not degrade under UV radiation. No chemical swell when subjected to moisture or fluids. Moderate cost. Operational properties Although the properties of pure PTFE are generally excellent, they can be improved or modified to meet specific operating conditions by the addition of fillers at the raw material stage. By this means PTFE can be given: Improved creep resistance. Increased surface hardness. Reduced frictional wear. Increased rigidity. Increased thermal conductivity. Increased thermal dimensional stability. Increased electrical conductivity. In its unprocessed state PTFE is a granular fine powder. Fillers are added and combined intimately with the powder when particular properties need modification. This is usually carried out on the raw materials by suppliers. Moulding To manufacture solid PTFE, a precisely metered quantity of the pure or filled powder is compressed to the desired shape and preformed using a technique similar to that for shaping powdered metals. During this procedure the powder compacts to between onehalf and one-fifth of its original volume. As PTFE has no liquid state it passes from crystalline solid to amorphous gel at 327 C it cannot be injection moulded like most polymers. It must therefore be moulded within the bounds of powder technology where no fluid pressure transfer characteristics exist. After preforming, the compacted dry powder resembles a stick of chalk: brittle and with little cohesion or strength. The moulded powder material is then sintered in an oven at between 360 C and 380 C well into its amorphous state where the granules coalesce. The material is cooled slowly to a hard, tough stress-relieved crystalline solid. The shapes can be: Finished mouldings. Blanks for machining. Stock bar, tube or sheet. 18 To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz
PTFE moulding 1. Mould filled PTFE polymer in one shot 2. Pressure applied, between 15-75 MN/m 2 depending on polymer type 3. Additional compaction from both ends 4. Compacted crystalline PTFE powder (preform) removed from mould 5. Programme-sintered in an oven at 360 C in free state. Now an amorphous gel (approximately 23% larger when cold) 6. Programme-cooled to ambient temperature. Now 2-3% smaller than preform 7. To machine shop as fully stress-relieved billet for precision manufacture of seal jackets Machining Other polymeric materials Solid PTFE is an excellent material to process further. It is safe and easy to machine using common metal-cutting techniques such as: Turning Milling Shaping Stamping, etc. Our experience is not confined to PTFE. We also work with: FEP (fluorinated ethylene-propylene), PFA (perfluoroalkoxy alkanes), PCTFE (polychlorotrifluoroethylene), PVFDF/PVF (polyvinylidene fluoride), UHMWPE (ultra high molecular weight polyethylene), PEEK (polyetheretherketone), PES (polyethersulphone), polyacetals, polyamides (nylons), and polyimides. Temperature control is critical when working with PTFE with extreme accuracy. Like many polymers, PTFE has a high coefficient of thermal expansion. But, in addition, this material experiences a step in its thermal expansion at 19 C when the molecular fluorocarbon chain straightens slightly in its helical form. This typically increases volume by about 1.3%. This expansion phenomenon makes it necessary to machine PTFE at 23 C or above. Allowances must therefore be made for dimensional differences between machining temperature and final operating temperature of the seal. We maintain strict temperature control during machining and subsequent inspection to ensure the dimensional integrity of our Fluolion components. To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz 19
enquiry form Customer name Contact Contact email Contact phone Project Application/Hardware Motion Static Reciprocating Rotary Oscillating Internal pressure External pressure Operating parameters Media to be sealed Back pressure is BP ring required? Units Minimum Maximum Operating Test Temperature Pressure Stroke length (reciprocating) Cycle rate Degree of arc (oscillating) Velocity Vacuum 20 To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz
Rod Piston Face seal Units Minimum Maximum A Diameter B Diameter C Diameter D Groove width / depth E Extrusion gap F Step height Surface finish (Ra) Other rod Other piston To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz 21
Technical guides These guides give detailed information on many of the sealing products and services supplied by James Walker. Please ask for your copies, or visit our website www.jameswalker.biz where many of them can be downloaded in pdf format. Hydraulic Sealing Guide Issue 28.5 Rod/gland seals Piston seals Wipers & scrapers Bearing strips O rings O Ring Guide Compression Packings Guide Issue 7 Issue 9 Gaskets & Jointings Guide Issue 8 The comprehensive guide to compression packings for Pumps Valves Hatch lids Crucible lids Furnace doors Gland sealing duties The comprehensive guide to O ring sealing systems including O ring selection General & high performance materials Housing design & tolerances Cords, kits & lubricants Sheet jointings & soft cut gaskets Spiral wound gaskets Kammprofile gaskets API/ASME ring joints Machined metal gaskets Complementary products High Performance Sealing Technology High Performance Sealing Technology Hydraulic seals High Performance Sealing Technology O Rings High Performance Sealing Technology Compression packings Gasket & jointings assuring bolted joint integrity POWER GENERATION Elastomer Engineering Guide Designed & produced by designbrand ltd Tel: 0845 0559216 www.designbrand.co.uk Improving valve sealing performance & emissions control Issue 3 OIL & GAS CHEMICAL PROCESSING TRANSPORT High Performance Sealing Technology Elastomer engineering Expansion joints & bellows Sealing Guide for the Iron & Steel Industry Issue 3 High Performance Sealing for all Marine Applications Issue 34 RotaBolt tension control Sealing Guide for Conventional Thermal Power Generation Sealing in the Nuclear Power sector Issue 3 Custom designed & manufactured Fully researched, developed & tested With nuclear standards & certifications Global support to OEMs, contractors & utilities Global supply of: Gaskets & jointings Packings & tank lid seals Expansion joints & bellows Rotary & hydraulic seals Pipe supports & much more Iron & steel industry guide 22 Issue 1.3 World class materials & sealing products Global supply of Best-value fluid seals & gaskets Standard & custom-designed products Bolting technology Vibration damping & control High Performance Sealing Technology Valve sealing guide High Performance Sealing Technology Marine industry Global supply of Best-value fluid seals & gaskets Standard & custom-designed products Expansion joints & bellows Bolting technology Vibration damping & control High Performance Sealing Technology Conventional power generation High Performance Sealing Technology Nuclear power generation To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz
General Information Health warning: If PTFE products are heated to elevated temperatures, fumes will be produced which may give unpleasant effects, if inhaled. Whilst some fumes are emitted below 300 C from PTFE, the effect at these temperatures is negligible. Care should be taken to avoid contaminating tobacco with particles of PTFE or with PTFE dispersion, which may remain on hands or clothing. Safety Data Sheets (SDS) are available on request. Information in this publication and otherwise supplied to users is based on our general experience and is given in good faith, but because of factors which are outside our knowledge and control and affect the use of products, no warranty is given or is to be implied with respect to such information. Unless governed by type approval or contract, specifications are subject to change without notice. Statements of operating limits quoted in this publication are not an indication that these values can be applied simultaneously. To ensure you are working with the very latest product specifications, please consult the relevant section of the James Walker website: www.jameswalker.biz. Environmental statement: This document is manufactured using advanced environmentally friendly technologies and follows the strict environmental standard BS EN ISO 14001. Made from chlorine-free pulp (ECF) with post-consumer recycled fibre obtained from sustainable wood forests, and printed using vegetable based inks, by Binfield Printers Ltd. For those who wish to reduce further their impact on the environment, this publication is also available as a PDF from: www.jameswalker.biz. To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz 23
James Walker worldwide support & distribution James Walker Asia Pacific Tel: +65 6715 6300 Fax: +65 6715 6301 sales.sg@jameswalker.biz James Walker Australia Tel: +61 (0)2 9721 9500 Fax: +61 (0)2 9721 9580 sales.au@jameswalker.biz James Walker Benelux (Belgium) Tel: +32 3 820 7900 Fax: +32 3 828 5484 sales.be@jameswalker.biz (Netherlands) Tel: +31 (0)186 633111 Fax: +31 (0)186 633110 sales.nl@jameswalker.biz James Walker Brasil Tel: +55 11 4392 7360 Fax: +55 11 4392 5976 sales.br@jameswalker.biz James Walker China Tel: +86 21 6876 9351 Fax: +86 21 6876 9352 sales.cn@jameswalker.biz James Walker Deutschland Tel: +49 (0)40 386 0810 Fax: +49 (0)40 389 3230 sales.de@jameswalker.biz James Walker France Tel: +33 (0)437 497 480 Fax: +33 (0)437 497 483 sales.fr@jameswalker.biz James Walker Iberica Tel: +34 94 447 0099 Fax: +34 94 447 1077 sales.es@jameswalker.biz James Walker Inmarco (India) Tel: +91 (0)22 4080 8080 Fax: +91 (0)22 2859 6220 info@jwinmarco.com James Walker Ireland Tel: +353 (0)21 432 3626 Fax: +353 (0)21 432 3623 sales.ie@jameswalker.biz James Walker Italiana Tel: +39 02 257 8308 Fax: +39 02 263 00487 sales.it@jameswalker.biz James Walker Middle East Tel: +971 50 7599180 sales.jwme@jameswalker.biz James Walker Mfg (USA) Tel: +1 708 754 4020 Fax: +1 708 754 4058 sales.jwmfg.us@jameswalker.biz James Walker New Zealand Tel: +64 (0)9 272 1599 Fax: +64 (0)9 272 3061 sales.nz@jameswalker.biz James Walker Norge Tel: +47 22 75 75 00 sales.no@jameswalker.biz James Walker Oil & Gas (USA) Tel: +1 281 875 0002 Fax: +1 281 875 0188 oilandgas@jameswalker.biz James Walker South Africa Tel: +27 (0)31 304 0770 Fax: +27 (0)31 304 0791 sales.za@jameswalker.biz James Walker UK Tel: +44 (0)1270 536000 Fax: +44 (0)1270 536100 sales.uk@jameswalker.biz BP4659 1016/1m PIIL2927319 James Walker Sealing Products & Services Ltd Registered Office: Lion House, Oriental Road, Woking, Surrey GU22 8AP, United Kingdom. Reg no: 00264191 England James Walker 2016