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Product List for Bearings, Seals & Crossflon PTFE Sliding Systems

CrossflonŽ PTFE Sliding Systems

> What are CrossflonŽ Slide Bearings?
> What are CrossflonŽ Skidway Plates?
> CrossflonŽ PTFE Sliding Systems Experience List
> CrossflonŽ PTFE Sliding Systems Typical Configurations
> CrossflonŽ PTFE Sliding Systems Technical Data


We offer a specialist service based on over 25 years experience in the design and manufacture of PTFE sliding systems. Our production facility has the capabilities to formulate, blend, mould, sinter, skive and chemically etch PTFE along with hot cure bonding, machining and finishing work.


Production is constantly monitored by a Quality Control Department approved by many major engineering contractors and the facility is accredited to BS EN ISO 9001:2000 and BS EN ISO 14001:2004.

 
Liquefied petroleum (LPG) plant utilising PTFE sliding systems
Liquefied petroleum (LPG) plant utilising PTFE sliding systems

We are committed to providing the highest quality products and services to all our clients. For further information please call our dedicated PTFE sliding systems sales line on +44 (0) 1204 675710, or email us at slide@beldamcrossley.co.uk.



What are CrossflonŽ PTFE Slide Bearings?

CrossflonŽ PTFE slide bearings are used to solve the problems of movement caused by temperature change and differential material thermal expansion, settlement and natural forces encountered by high winds and even seismic activity.

Typical Applications Include:


  • Pipe lines
  • Heat exchangers
  • Pressure vessels
  • Storage tanks
  • Industrial machinery
  • Buildings and bridges

 
Petroleum Pipeline and Suspension Bridge
Petroleum pipeline utilising PTFE slide bearings (main image)
Suspension bridge utilising PTFE/elastomeric slide bearings (inset)


A CrossflonŽ PTFE slide bearing normally comprises of an upper element and a lower element, which operate by sliding against one another. The upper element is generally larger than the lower element by the amount of the anticipated movement. This ensures that the lower element is subjected to uniform load throughout motion and excludes foreign matter from the sliding interface.

We offer CrossflonŽ PTFE slide bearings in a range of configurations although each is designed to suit the specific application. A typical slide bearing element consists of 2.5mm thick CrossflonŽ 1025 or CrossflonŽ 1000 hot cure factory bonded under controlled conditions of temperature and pressure to a 3mm thick steel backing plate for welding to the installation. Alternative material thicknesses can be supplied.

Substantial deviations from parallel or rotational movement of the structure can be accommodated by incorporating an elastomeric element within the CrossflonŽ PTFE slide bearing.

CrossflonŽ PTFE slide bearings are able to operate through a temperature range from -195°C (-319°F) to 260°C (500°F).

CrossflonŽ PTFE slide bearings employ either CrossflonŽ 1025 (a specially compounded reinforced PTFE) or CrossflonŽ 1000 (virgin PTFE) at the operating surface. CrossflonŽ 1025 and CrossflonŽ 1000 are capable of accommodating loads of 18 Mpa (184 kg/cm2) and 7 Mpa (71 kg/cm2) respectively. The load bearing capacity of these materials can be increased by containing them in a recessed steel backing plate.

For special considerations or difficult conditions, please contact us for assistance.



Installation of CrossflonŽ PTFE Slide Bearings

CrossflonŽ PTFE slide bearings can be fixed to the installation by full welding, tack welding, mortar embedment or bolting. The appropriate slide bearing configuration should be selected to suit the method of installation. Care should be taken to adequately protect the surface of the PTFE during installation.



CrossflonŽ PTFE Slide Bearings Selection Guide

  • Calculate the overall load of the structure as this will indicate the total area of the CrossflonŽ PTFE slide bearing required at an appropriate temperature and pressure.
  • Consider the function and rigidity of the structure to determine the quantity and positions of the CrossflonŽ PTFE slide bearings.
  • Take account of any unusual conditions that will affect the CrossflonŽ PTFE slide bearings during operation, such as the temperature at the sliding interface, angular misalignment and the need for acoustic or vibration damping.
  • The type of adhesive used is determined by the temperature range at which the CrossflonŽ PTFE slide bearings will be operating. We ask therefore that this information is specified on all enquiries.
  • Determine the most suitable method of fixing the CrossflonŽ PTFE slide bearings to the installation.
  • Consider the operating environment and select the type of steel for the backing plates accordingly.

If you have any difficulty in specifying your CrossflonŽ PTFE slide bearings please contact us for assistance.




Advantages of CrossflonŽ PTFE Slide Bearings:

  • PTFE has the lowest coefficient of friction of any solid material and there is no stick / slip action.
  • Operating temperature ranges from -195°C (-320°F) to 260°C (500°F).
  • The life of PTFE is indefinite as it is unaffected by chemicals and weather.
  • Maintenance is not required. Capable of operating completely dry as PTFE will never cold weld to itself.
  • Ease of installation.
  • Shear value of the bond exceeds that of the PTFE.
  • Far less bulky than alternative assemblies.
  • PTFE is unaffected by water as the moisture absorption is less than 0.01%.
  • Not subject to fatigue failure.
  • Provides electrical and thermal insulation thereby preventing galvanic corrosion and reducing heat loss.
  • Vibration dampening.
  • Able to absorb small particles without increasing the coefficient of friction.
  • PTFE is chemically inert.
  • Able to accommodate some misalignment.


Contact Us:

Beldam Crossley Limited
P.O. Box 2141
Lostock Lane Industrial Estate
Lostock
Bolton BL6 4SB
England

tel: +44 (0) 1204 675710
fax: +44 (0) 1204 675701
email: slide@beldamcrossley.co.uk



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