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TB1394 – Air Brake Dryer.

The Filter Guys

We are currently offering a one time special offer for fifteen units of the air brake dryer TB1394 at the knockdown price of £30.00 per unit.

This filter is the equivalent to:

  • Baldwin – BA5566
  • Donaldson – P951415
  • Knorr Bremse – K005686
  • Knorr Bremse – K014712
  • Knorr Bremse – K039453
  • Mahle – AL26
  • Mann Filter – TB1394/5
  • Renault – 5001865404
  • Renault – 7421267793
  • Schupp – ST1393
  • Volvo – 20754416
  • Volvo – 21267818
  • Wabco – 4329012452

Call now and save yourself a small fortune on your air brake dryer requirements.

This offer is a first-come first-served, whilst stocks lasts, limited offer. So don’t delay, call Sterling Filtration, today.

– 10th March 2017.

Ultra-Web® Cartridge – Donaldson Torit Filters.

The Filter Guys

A Genuine Torit-Built® Filter Engineered for Dust Collection

  • Nanofiber layer ensures longest filter life at a significantly lower pressure drop.

  • Substrate media features increased rigidity, higher durability, and superior cleanability.

  • MERV* 13 filtration efficiency rating per ASHRAE 52.2-1999.

  • Start-up efficiency of 99.9% on 0.2-2 μm dust particles reflects highest industry standard (BIA Class M).

  • Superior particle release due to surface filtration.

  • Lightweight and easy to install.

  • Flame retardant media available.

  • Stainless steel construction available.

Above: Ultraweb Media magnified 600x


  • Premium performance on extremely fine, dry, and nonfibrous dust.
  • Durable for more abrasive dust.
  • Outer liner available for most applications.
  • Outer liner removed for agglomerative dust applications.

Call Sterling Filtration on 01902 491118 with your Donaldson Torit filter enquiries.

Pre-line Fuel Filtration Housing.

The Filter Guys

Today, diesel vehicles are fitted with the latest high performance fuel injection systems. As a result, fuel filtration must meet far more demanding requirements. Pre-Line is a universal and practical pre-filter system, based on the spin-on filter concept, which provides an ideal, cost-saving retrofit solution.

Features and advantages

  • Use with diesel fuel DIN ISO 590 (5% FAME), DIN 51 628 (7% FAME)
  • Up to 600 l/h volume flow rate
  • Use of multigrade high performance media
  • 93% water separation
  • Modular system with excellent flexibility
  • Easy to service
  • Integrated, effective and easy to handle hand pump with 45 degree position to drain off water and for priming during service
  • Integrated water collector
  • Parallel operation possible with a number of systems

These filter housings from Mann Filter are available from Sterling Filtration Ltd.


Air Filter Servicing, Best Practises, Part 4 of 4.

The Filter Guys
  1. Installing RadialSeal™ filters
  • Donaldson RadialSeal filters have a dry lubricant on the seal which aids in installation and removal during air filter servicing. Do not remove the lubricant.
  • No cover pressure is required to hold the seal in place and one should NEVER use the service cover to apply pressure.
  • Forcing a cover could damage the housing, filter and fasteners and void the warranty.
  • If the service cover presses against the filter before the cover is fully in place, remove the cover, push the filter further into the air cleaner by hand and then the cover will go on with no extra force.

  1. Filter service & maintenance records
  • Vehicle and engine manufacturers provide filter maintenance practices for the equipment they sell. Make sure to follow their recommendations for routine filter service. Being able to show/reveal your maintenance records for potential warranty claims is essential.
  • Like all components, air intake systems have evolved and older styles and filters have different maintenance procedures. Make sure your maintenance personnel are familiar with the proper service techniques.
  • Log or track your filter changes. Whether your are going to service by miles, hours or restriction.
  • Many maintenance shops find it helpful to record the date of filter change directly on the filter.
  • If you have to replace an entire air cleaner housing, consider designs that offer improved filtration performance (high efficiency filtration) or enhanced sealing (Donaldson RadialSeal™ housings).


  1. Avoid cross contamination during filter service. When a dirty filter is at its service point — the inlet side of the filter is loaded with contaminant — take these precautions to eliminate contaminant from getting on the outlet side of your new filter or clean sealing surfaces (gaskets or RadialSeal™ end caps).
  • If you wear gloves during service, remove them prior to handling the new filter.
  • If you don’t use gloves, wash or clean your hands before handling the new filter.
  • Keep your new filter in its box until your ready to replace.
  • If product box has layers of contaminant, take care that the contaminant doesn’t get

on the new filter as you remove it from the box.


  1. Inspect the entire air induction system The last step to any air filter service, is to inspect and tighten all air cleaner system connections.
  • Immediately replace or repair any visible holes or damaged components.
  • Inspect all air ducting for worn spots or damage — elbows, connections and seals.
  • Check all clamps, making sure they’re secure and tight.
  • Inspect your pre-cleaners or inlet hoods (if equipped).
  • Annual replacement of air cleaner system gaskets is recommended.
  • Reset manual filter indicators.
  • Record action items taken in your filter service records.

Air Filter Servicing, Best Practises, Part 3 of 4.

The Filter Guys
  1. Do not judge the filter’s remaining life by looking at it. A dirty-looking filter may still have plenty of life left.
  • On the other hand, a clean-looking filter can also be deceiving.
  • You can’t see the dirt that’s embedded deep within the filter media, and carbon contamination may not be visible to the eye.
  • One of the best options for lowest filter maintenance costs and best engine protection is to monitor air filter life with a restriction indicator.
  • It’s a low-cost and smart investment.

  1. Don’t ignore a worn or damaged gasket. If your air cleaner has a cover gasket, replace it with a new one when changing filters.
  • Some air cleaners, such as the EBA and ERA models, specifically call for a new gasket with each filter change-out.
  • Never reuse the old one. Replace it according to the service instructions.


  1. Don’t take chances with weatherworn Vacuator™ Valves which can admit dirt instead of expelling it.
  • Replace any missing or damaged Vacuator Valves and any air cleaner fasteners.
  • Make sure the valve is flexible and not inverted, damaged or plugged. Replace it if damaged or if it looks like any of these images. A damaged or missing Vacuator Valve will disrupt the designed flow of air through the air cleaner.


  1. A water manometer is the most accurate method to verify airflow restriction.
  • For testing of initial restriction and confirming remaining filter life, we recommend the greater accuracy of a clock type restriction gauge or water manometer.
  • Use the restriction tap provided on the air cleaner or at the transfer pipe.
  • Replace the filter only when the restriction level has reached the maximum recommended by the engine or equipment manufacturer.
  • Restriction indicators that are mounted on the air cleaner system are recommended for keeping an eye on restriction levels and indicating when servicing is due.

Air Filter Servicing, Best Practises, Part 2 of 4.

The Filter Guys
  1. Do not clean a primary or safety filter instead of replacing it.
  • Heavy-duty air filtration manufacturers do not recommend any type of cleaning process to be used on their products.
  • Once an air filter has been cleaned or washed, the Donaldson filter warranty is no longer valid.
  • The dirt holding capacity of a filter is reduced 20 – 40% with each cleaning attempt.
  • There is also the real risk of dirt reaching the clean side of the filter if cleaning is attempted.
  • The risk of filter damage from washing, tapping, high pressure water, or compressed air cleaning is very real.
  • The potential savings from risky attempts at filter cleaning won’t come close to offsetting potential damage to engine components.
  • Increased engine wear and damage is the result of the ingression of contaminant over time.


  1. Don’t use a dented or damaged filter.


  1. Check any intake hoods and pre-cleaner devices during maintenance routines.
  • A missing inlet hood will significantly shorten filter life. If your unit had a hood or pre-cleaner originally, make sure you replace it.
  • Check openings and tubes on pre-cleaners to make sure they are not plugged
  • Replace any units that are damaged. Damaged or dented units will not operate properly.

  1. Never leave an air cleaner open longer than necessary. An open air cleaner with filter removed is a direct entry to the engine.
  • Keep your engine protected during filter changes.
  • Contaminants that are smaller than the eye can see can be damaging to an engine.
  • If the air cleaner housing is not going to be reassembled immediately, be sure to cover the opening.

Air Filter Servicing, Best Practises, Part 1 of 4.

The Filter Guys
  1. Don’t remove an air filter from its housing simply to inspect it.
  • Removing and replacing the same filter during air filter servicing can do more harm than good.
  • Ridges of dirt on the gasket sealing surface can drop on the clean filter side when the gasket is released.


  1. Never hit a filter to try cleaning it.
  • Rapping hard enough to knock off dust damages the filter and can place your engine at risk for dust ingestion.
  • Deeply embedded dirt is never released by tapping.
  • It is always safer to keep operating until you can change to a new filter than to try and tap out the dirt.


  1. Never operate a system with only a safety filter in place.
  • Safety or secondary filters used alone will let harmful contaminant enter the engine.
  • Safety or secondary air filters are designed to compliment the primary filtration or provide protection during primary filtration service.


  1. For longer service between filter changes, consider upgrading to an extended service filter such as Donaldson Endurance™ air filters. Then service the filter by restriction only.

  1. Ideally, service your air filter by restriction measurement or follow

your regular maintenance schedule.

  • If you don’t trust your current filter service indicator, getting a new one is a good idea.
  • Restriction indicators, mounted on the air cleaner system are recommended for keeping an eye on restriction levels and indicating when servicing is due.
  • For testing of initial restriction and confirming remaining filter life, we recommend the greater accuracy of a clock-type restriction gauge or water manometer.

Hydraulic Filtration Pressure Drop

The Filter Guys

Hydraulic Filtration Pressure Drop


The difference between the inlet pressure and the outlet pressure is called pressure drop or differential pressure. It’s symbolized by ∆P. ∆P is an irrecoverable loss of total pressure caused by the filter, and is mostly due to frictional drag on the fibers in the media.

Differential drop drop may increase as the particulate rating or efficiency of the filter (as expressed by its beta ratio) gets better. ∆P also increases as the filter is being loaded with contaminant.


Four Major Factors Contribute to Pressure Drop


  1. Filter Media.


Media is, of course, the main factor influencing pressure drop; indeed, it causes pressure drop. That’s why having a low-friction, high-flowing media is so important. The natural cellulose or paper fibers (shown at left) typically used in filtration are large, rough, and as irregular as nature made them.

Donaldson developed a synthetic media with smooth, rounded fibers, consistently shaped so that we can control the fiber size and distribution pattern throughout the media mat, and still allow the smoothest, least inhibited fluid flow. Our synthetic media is named Synteq™.

Synteq fibers offer the least amount of resistance to fluid passing through the media. Consistency of fiber shape allows the maximum amount of contaminantcatching surface area and specific pore size control. The result is media with predictable filtration efficiencies at removing specified contaminants (i.g., 4 µm) and maximum dirt holding capacity.

Natural cellulose fibers are larger than synthetic fibers and jagged in shape, so controlling size of the pores in the media mat is difficult and there is less open volume. In most applications this results in higher ∆P as compared to synthetic filters. Higher beta ratings mean there are smaller pores in the media; smaller media pores cause more flow resistance, in turn causing higher pressure drop.


  1. Dirt.


Contaminant As dirt gets caught in the media, it eventually begins to build up and fill the pore openings. As the pore openings shrink, the differential pressure (pressure drop) increases. This is called restriction. This photo from our scanning electron microscope shows actual dirt particles building up in the media pores.

Excessive dirt in the media can cause dirt migration or even filter failure. Dirt migration occurs when the restriction is so great that the differential pressure pushes dirt deeper into the media and, eventually, through the media and back into the system. Filter failure occurs when the restriction becomes so high that the filter cartridge collapses (outside-in flow) or bursts (inside-out flow) to relieve the upstream pressure.

To avoid such catastrophe, use of a filter service indicator is recommended. It measures the pressure drop across the filter, then signals when the filter is ‘full’ and needs to be changed.


  1. Flow


Higher flows create higher pressure drop. With fast moving fluid, there will be more friction causing higher pressure drop across the media.


  1. Fluid Viscosity


Measured in centistokes (cSt) or Saybolt Seconds Universal (SSU or SUS), fluid viscosity is the resistance of a fluid to flow. As fluid viscosity increases, the cSt rating increases. Higher fluid viscosities also mean higher pressure drop because the thicker oil has a tougher time passing through the layer of media fibers. Cold start fluid is a good example of highly viscous fluid. See chart below.

Filter media, amount of contamination, the flow rate, and fluid viscosity are all factors in the importance of sizing the filter for the system requirements. Filters that are too small won’t be able to handle the system flow rate and will create excessive pressure drop from the start. The results could be filter operation in the bypass mode, filter failure, component malfunction, or catastrophic system failures. Filters that are too large for the system can be too costly. Oversized filters require more system oil and higher cost replacement filters. Optimal sizing is best.

Types of Hydraulic Fluid

The Filter Guys


Types of Hydraulic Fluid

There are many kinds of fluids used for power, but they can basically be called petroleum-based fluids, biodegradable fluids, and fire-resistant fluids. A brief description of some of the types in each category are listed below; for details on these or others, consult your filter supplier or refer to a reputable manual on hydraulics, such as the Lightning Reference Handbook, published by Berendsen Fluid Power, Whittier, CA 90601.


Petroleum Based (Hydrocarbon)

These are the most commonly used fluids in hydraulic systems. Their major advantages are low cost, good lubricity, relatively low/non-toxicity, and common availability. This type of fluid is not just plain oil; rather, it is a special formulation with additives that make it suitable for hydraulic systems. Mostly, the additives inhibit or prevent rust, oxidation, foam and wear.



  • Straight oils: same as petroleum-based oil but without the additives.
  • Automatic transmission fluids (ATF): excellent low temp viscosity and very high VI.
  • Military hydraulic fluids (ie: MIL-H-5606 and MIL-H-83282): also called ‘red oil’ because of the colour. Low viscosity, good for cold temp operations, but may have to be modified for pumps.


Fire Resistant Fluids.

There are two types of fire-resistant fluids commonly used in hydraulic applications: Phosphate Esters and High Water Based Fluids (HWBF). Although generally not as viscous at cold temperatures as petroleum-based fluids, they are fire resistant due to their high content of non-combustible material. Very useful in overcoming the likelihood of fire caused by a broken hydraulic line spraying petroleum fluid into a pit of molten metal, onto a hot manifold, into a heat treating furnace, or other ignition source.


Some types of HWBF:

  • Oil-in-water emulsions (HFA): typically 95% water and 5% oil, with the oil droplets dispersed throughout the water. Provide some fire resistance, but due to oil content, other fluids are superior.
  • Water-in-oil emulsions (invert emulsion HFB): typically 40% water and 60% oil, with the water dispersed in the oil. Provide some fire resistance, but due to oil content, other fluids are superior.
  • Water-glycol (HFC): typically 40% water and 60% glycol. Excellent fire resistance. Since glycol is an antifreeze, water-glycol can be used at lower temps. NOTE: HWBF may require reduced pressure rating of pumps and other components.


HFD Fluids.

The HFD group is a classification given to several different types of synthetic products that do not contain petroleum oil or water. Phosphate ester fluids were the first HFD fluids and are the most fire resistant within the HFD family. Not as popular today, their use declined due to poor environmental performance, limited compatibility, and high cost.

Certain phosphate esters have very high auto-ignition temperatures and are still used in specific applications, such as aircraft and power generation.


A common brand is known as Sydrol® (registered trademark of Solution, Inc.). Skydrol requires EPR seal for chemical compatibility. Today most phosphate esters have been replaced by polyol esters. Based on organic esters, polyol esters are the most common HFD fluids used today. They offer good inherent fire resistance, good compatibility with system materials, excellent hydraulic fluid performance, and easy conversion from petroleum oil. In addition, the organic nature of these fluids gives them good environmental performance in biodegradability and aquatic toxicity. Another type of synthetic, fire resistant fluids have been formulated for certain niche markets.


Water free polyalkylene glycols (PAGs) feature extended fluid life and good environmental performance. Technically an HFD fluid, PAGs (also known as polyalphaolefins (PAOs) are more often used for their biodegradability and overall environmental friendliness. This group also contains the synthetic silicone (siloxane) oils, known for their anti-foaming properties.



With increasing concern about the environmental impact of hydraulic system leaks and spills, biodegradable fluids are receiving expanded usage, particularly in Europe. There are two types of common biodegradable hydraulic fluids: 1) vegetable-based oils, such as sunflower or rapeseed oils, and 2) synthetic oils like diesters, etc. Generally, systems using biodegradable fluids are derated for maximum and minimum temperatures. Users who replace standard hydraulic oils with biodegradable oils must check with filtration component manufacturers to confirm that the fluid and components are compatible.



The Filter Guys

Schupp filters are now available from Sterling Filtration Ltd. Schupp are a worldwide brand offering 1000’s of aftermarket air, lube oil, fuel and hydraulic filters for many common on and off highway applications. We can offer competitively priced Schupp original filters, what ever your current Schupp original requirements may be.

If you require Schupp filter replacement elements please give us a call today.

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