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Air filters: What is the purpose of a safety filter?

The Filter Guys

What is the purpose of a safety filter? Safety filter, secondary filter, inner filter; there are many names, we prefer to call it a safety filter.

A safety filter backs up the primary filter, and protects the clean air ducting while the primary is out of the housing during service. The engine should never be run with only a safety filter in place.

The safety filter is NOT a spare filter! Its purpose is to protect the engine if something goes wrong with the primary (main) filter. Until then, all it does is take up space and add a little bit of restriction.

What can go wrong with the primary filter?

It may have hidden damage from shipping that you missed when you inspected it before installation; damage from cleaning (if you carry out such an unrecommended procedure); maybe even a manufacturing glitch; mis-installation by the mechanic (but this never happens, right?); a ‘will-fit’ that doesn’t quite fit; or it’s the wrong part altogether and doesn’t fit at all into the housing (but mechanics would never try this, would they?)

All of these things happen more often than any of us like to think. We determined many years ago that a really good way to provide additional protection for large engines operating in heavy dust conditions was to always offer and for you to always use a safety filter.

There are some characteristics about the safety filter which you should be aware of, so you understand what it does and doesn’t do for your engine:

  • is smaller than the main filter, with less media.
  • is more open and less efficient for lower restriction.
  • has less contaminant-holding capacity so that it will plug rapidly if any engine-damaging dust particles get past a damaged primary filter.

A safety filter offers protection against mistakes when fitting and reduces the need to open the clean air side of the system by 66% (they usually only need changing once every three main filter changes) compared to systems without a safety filter. They are an excellent insurance against contaminants entering your engine and upon a critical failure of the main element can save your engine from serious damage.

Draper Tools are available through us.

The Filter Guys

People often are unaware of the additional goods and services that we can offer. As a filtration company people don’t realise we offer extra services such as Draper Tools.

So with the weather on the up maybe it’s time to look at those garden improvements that you’ve been dreaming about all winter and spring. Shovels, rakes, lawn edgers, hoes, leaf collectors and everything else you may need to get your green fingers working are available through us.

Draper weed matting is an affordable and simple way to keep away unwanted growth so that the plants you want to grow can thrive.

Draper loppers and hand trimmers are a must to help you maintain those out of control overgrown bushes, so go on give your bush a trim this summer.

And for later in the year you’ll need a Draper leaf blower to help you clear away the autumn blues.

And when you’ve finished working hard you’ll need to put your feet up with a burger and a beer; but at the end of the summer don’t forget to get a Draper barbecue cover to keep things in tip top condition so you can do it all again next year.

How Filter Media Functions In a Filtration System

The Filter Guys

How Filter Media Functions. The job of the media is to capture particles and allow the fluid to flow through. For fluid to pass through, the media must have holes or channels to direct the fluid flow and allow it to pass. That’s why filter media is a porous mat of fibers that alters the fluid flow stream by causing fluid to twist, turn and accelerate during passage.

The fluid changes direction as it comes into contact with the media fibers, as illustrated above. As the fluid flows through the media, it changes direction continuously as it works its way through the maze of media fibers. As it works its way through the depths of the layers of fibers, the fluid becomes cleaner and cleaner. Generally, the thicker the media, the greater the dirt-holding capacity it has.

Looking at a cross-section view of the fibers:

we can see how the flow stream is accelerated as it flows into the spaces between the fibers.

This is applies to all liquid filters, be they oil, fuel, water of water glycol. For more information on filtration products and replacement elements please contact us for a chat. We’re here to help.

Vacuum Pump Filters

The Filter Guys

Air filters are an important part of any vacuum pump filters system. They prevent dirt from being sucked into the vacuum pump, and help avoid unnecessary wear. They offer minimum pressure losses and guarantee energy efficiency and long service life and can ensure your vacuum pump continues to operate at optimum performance levels.

The airtight vacuum air cleaners available at Sterling Filtration Ltd are designed for installation in air and gas pipes. They are airtight up to 1000 mbar negative pressure and equipped with a filter element. They are also used as intake filters in vacuum pumps.

Complete vacuum housings and replacement elements are available at Sterling Filtration Ltd. Tel: 01902 491118.

Donaldson Lube Filters and Hydraulic Filtration.

The Filter Guys

Spin-on Filters

Donaldson durable lube filters keep your equipment running at its best to let you focus on what’s most important, getting your job done.

Donaldson Endurance Plus Additive Replenishment Technology Filters

These filters are designed for today’s emissions compliant EGR engines, use a controlled chemical release process to replenish the additives in the engine oil and deliver extended drain intervals, often double that of standard filters. These filters are a direct replacement and require no system modifications or special maintenance.

Cartridge-style Filters

Donaldson offers a complete line of cartridge-style lube filters for all makes of equipment.

Continous Product Development

Donaldson has applied its patented radial sealing technology to spin-on style lube filters. The radial seal design provides a consistent, reliable seal, enhanced structural performance and optimum protection.