MULLER FILTER, with 30 years experience in OE filter development , places itself like an European Independent After market key supplier, offering an original quality range with a continuous product extension.
The MULLER FILTER product line, with over 1400 types of oil, fuel , air and cabin air filters, covers about 95 percent of European and Asiatic passenger car and light commercial vehicles applications.
MULLER FILTER proposes a wide range of filters for the automotive industry, machines and engines, updated with continuous program extension.
Our product line consists in over 1400 types of Fuel , Oil , Air, Cabin Air filters covering about 95 percent of European and Asiatic passenger car and light commercial vehicles applications.
What makes in a Muller filter an elevated performance products of guaranteed quality :
- continuous R & D investments;
- modern production machinery;
- quality control systems according to the international ISO requirements;
- a professional staff with long time experience;
- partners homologated from OE manufacturers;
- a quality policy aimed at environmental protection according to ISO 14001.
FUEL FILTER
TYPOLOGY
Fuel filters can be designed as:
Petrol carburettor filter
Petrol injection filter
Diesel injection filter
FUNCTION
Their objective is to prevent the premature wear and breakage of the injection system components
- retaining any particle or impurity suspended as dust, rust, etc
- eliminating the water deriving from fuel tank condense
WHEN SHOULD THE FUEL FILTER BE REPLACED
Following the vehicle manufacturer recommendation; however Muller Filter suggests to replace fuel filter at least once per year.
DELAYED OR MISSED REPLACEMENT CAUSES
- breakage of fuel injection system
- wear of fuel injection systems components
- difficult starting caused from irregular fuel burning or irregular fuel flow
- high consume
- less engine power
HOW DOES IT WORK?
The fuel pump aspirates the fuel from the tank and via a fuel filter pumps it to the carburettor/injection system. Fuel Filter prevent that contaminants plug the nozzles causing the engine stutters or stops altogether.
FILTERING MEDIA
Usually fuel filters are manufactured with cellulose filtering media. Faithfully following the specifications of vehicle manufacturers, Muller Filter uses several different types of filtering media to produce its fuel filters.
Pressure drop and filter-life (dust loading capacity) are designed according the OE requirements.
Dedicated to resolve the strict efficiency requirements of New Common Rail Diesel Injection systems, Muller Filter has manufactured a new generation of high efficiency fuel filter using new multi layer media, reinforced with synthetic material.
The results are:
- great dirt holding capacity
- high efficiency
- great water separation
The most relevant technical specifications of filtering media
Technical Specifications Minimum Maximum
Grammage (grs./m²); 80 320
Maximum Pore (µ) 18 60
Micron Rating 90% (µ) 2 20
PETROL
CARBURETTOR FILTER
The
fuel pump aspirates the fuel from
the tank and pumps it in the
filter situated before the
carburettor .
Usually the carburettor filter is
a small element in nylon housing
with connecting pipes ; frequently
the housing is transparent so
contamination can be verify.
The carburettor filter is situated
between tank and carburettor to
prevent that contaminants plug the
nozzles in the carburettor.
The filtration rating is about 20
microns
PETROL
INJECTION FILTER
The
fuel pump is usually mounted in
the tank and pumps fuel via the
filter element to the injectors.
Petrol Filter prevent that
contaminants plug the injector
nozzles .
The element is sited usually in a
metal housing with connecting
pipes or screw nuts .
The filter is mounted at the
underside of the car.
The injection system components
are much sensitive to
contamination, therefore is
necessary that filter element is
finer than the carburettor system.
For this reason filtration rating
is about 5-7 microns
DIESEL
INJECTION FILTER
The
fuel pump aspirates the fuel from
the tank and pumps it to the
high-pressure injection pump via a
diesel filter.
The injection system components
are manufactured with high
precision and working to high
pressure (up to 2500 bar) in the
injection system. Therefore is
required that filter element is
able to retain abrasive particles
as well as water present in the
diesel fuel.
The filter element is mounted in
metal or nylon housing that also
serves as water separator.
The specific weight of water is
higher than diesel fuel so the
water is deposited at the bottom
of the housing to be drained .
In some diesel injection system,
the Diesel filter has automatic
water sensor: when the maximum
water level in the housing filter
is reached, on the dashboard
starts to light up an apposite
lamp which informs the necessity
to drain.
The Diesel filter is located at
the highest circuit point
therefore can catch air bubbles
present in the circuit and drain
them through a unscrew-bolt .
The adoption of new Common Rail
Diesel Injection systems (or
Electronic Unit Injection ),
working to pressure up to 2500
bar, requires highest performance
from Diesel Filter .
Reason for Muller Filter to
develop and manufacture a new
generation of high efficiency
diesel filter media .
This particular media is produced
to pair one or more synthetic
melt-blown media layers on one
distinctive paper media layer,
guarantying greater dirt holding
capacity, higher efficiency, and
improved water emulsion removal
characteristics.
Filtration rating is about 2 to 8
microns.
OIL FILTER
TYPOLOGY
Oil filters can be designed as:
Spin-on Filter ( Metal Oil filter) which is replaced completely after its useful life;
Cartridge-Filter ( Metal Free) only the cartridge needs to be replaced because housing is fixed into engine.
FUNCTION
Their objective is to prevent the premature wear and breakage of the engine components :
- retaining any particle or impurity suspended in the oil (as dust, abraded metal, carbon deposits, soot particles, etc.) of a diameter which is superior to the lubricating film thickness
- eliminating the resulting product from the combustion which goes into the oil sump
- cooling : absorb and transport heat from engine
- sealing : the rings between liner and piston, etc
WHEN SHOULD THE OIL FILTER BE REPLACED
Following the vehicle manufacturer recommendation; however Muller Filter advises to replace oil filter every oil change or at least once per year.
DELAYED OR MISSED REPLACEMENT CAUSES
- breakage of engine
- wear of the engine components
- noise of mechanical components and combustion process
HOW DOES IT WORK?
The oil present in the carter is aspirated from the pump and once purified by oil filter arrives to all engine components that need lubrication.
There are different types of oil filters:
Full-flow filters
By-pass filters
Full-flow/ By-pass filters (combination)
Full-flow filters
All the oil, aspired by the pump, pass through the filter before going to the places that need lubrication.
The oil pump incorporate an overpressure valve that limits the oil pressure between 3 to 5 kg/cm2.
If the pressure exceed this limit the gaskets are pressed out of their sittings or the oil filter is blown out of its sitting and oil starts leaking out..
A by-pass valve is mounted to prevent a too high pressure difference between the clean and dirty side the of the filter element.
This valve opens at a pressure difference from 0,5 to 3 Bar so the oil can still lubricate the engine. An additional anti-drain valve prevents the filter to drain oil to the carter when the engine is stopped. Some filters are provided with an anti-siphon pipe to avoid oil siphoning out of the filter when the engine is stopped.
By-pass aspirated/ combination filters
The oil aspired from the carter is pumped directly to the engine components that need lubrication. In another line, where the by-pass filter is putted in, about 10% of the main oil flow passed to be filtered.
The main oil flow (about 90%) goes unfiltered to the engine, but the efficiency of the by-pass filter is however very high because the same oil is repeatedly passing the filter element, permitting to by-pass system to catch all particles ( multi-pass oil filter).
FILTERING MEDIA
100% of the oil filters are manufactured with cellulose filtering media. Faithfully following the vehicle manufacturer specifications , Muller Filter uses several different types of filtering media for the manufacturing of its oil filters.
Pressure drop and filter-life (dust loading capacity) are designed according to OE requirements.
The most relevant technical specifications of filtering media:
Technical Specifications Minimum Maximum
Grammage (grs./m²); 80 320
Maximum Pore (µ) 18 60
Micron Rating 90% (µ) 2 20
AIR FILTER
TYPOLOGY
Air filters can be designed as:
Panel air filter
Circular air filter
Cylinder air filter
Usually only the air filter element needs to be replaced because housing is fixed into engine.
FUNCTION
Their objective is to purify the air, so as to obtain a perfect mix with fuel , permitting an efficient combustion.
Air filter elements prevent also the premature wear and breakage of the engine components retaining the impurity as abrasive dust, dirt, etc.
WHEN SHOULD THE AIR FILTER BE REPLACED
Following the vehicle manufacturer recommendation; Muller Filter advises to replace air filter at least once per year and however check the filter cleanliness every oil change.
DELAYED OR MISSED REPLACEMENT CAUSES
- wear of valves, cylinders, rings, rockers and bearings
- difficult starting caused from irregular combustion
- decreased throttle response
- high consume
- less engine power
HOW DOES IT WORK?
The engine aspirates the air through a Filter element situated between carburettor/ injection system and Air Intake.
Depending on its cubic capacity, an engine could consume between 200 and 500 m3 of air per hour.
The filter element is inserted in a plastic housing sited under the car hood. Normally, Air Filter is produced with Pleated Paper media surrounded , for all his border line, from a polyurethane gasket . However other media type are used in accordance to Filtration Efficiency required.
The plastic air filter Housing avoid contact with water and it contains a temperature control sensor that regulates the Intake Air temperature , optimising the combustion efficiency.
FILTERING MEDIA
Usually the air filter elements are manufactured with cellulose filtering media. Faithfully following the specifications of the vehicle manufacturers, Muller Filter uses several different types of filtering media to produce its air filters.
Dedicated to resolve the strict efficiency requirements of New Injection systems , Muller Filter has manufactured a new generation of high efficiency air filter using new multi layer media, reinforced with synthetic material.
This particular media is produced to pair one or more synthetic melt-blown media layers on one distinctive paper media layer, guarantying greater dirt holding capacity, higher efficiency, and improved water emulsion removal characteristics.
protection from dust and dirt, preventing damage to valves, cylinders, rings, rockers and bearings.
The results are:
- great dirt holding capacity
- high efficiency
- great water separation
The filtration rating is about 10 to 30 microns.
The most relevant technical specifications of filtering media:
Technical Specifications Minimum Maximum
Grammage (grs./m²); 100 195
Maximum Pore (µ) 50 110
Micron Rating 90% (µ) 15 45
CABIN FILTER
TYPOLOGY
Cabin Air filters can be designed as:
particle cabin air filter
active carbon cabin air filter
Usually only the cabin filter element needs to be replaced because housing is fixed into engine.
FUNCTION
Their objective is ensure in the passenger compartment the maximum protection against pollutants, dust, soot, bacteria, fungi, etc .
Active carbon cabin air filters provide moreover additional defence against unpleasant odours, exhaust harmful fumes, benzene, ozone, etc.
WHEN SHOULD THE CABIN FILTER BE REPLACED
Following the vehicle manufacturer recommendation; Muller Filter advises to replace cabin air filter every 15,000 to 30,000 km or at least once per year; check the filter cleanliness every oil change.
The filter has to be replaced at short intervals, so that the pollutant particle accumulation will not cause any inconvenience to vehicle ventilation system.
DELAYED OR MISSED REPLACEMENT CAUSES
- insufficient performance of vehicle ventilation system
- offensive smells when starting up
- appearance of foggy which is difficult to remove
HOW DOES IT WORK?
The air aspirated from air-conditioner system pass trough Cabin filter before arriving into passenger compartment, ensuring protection against pollutants, dust, soot, bacteria, fungi, etc
Usually the filter element is inserted in a plastic housing sited under the car hood.
Normally, Filter element is produced with synthetic filter media surrounded from a rigid border , sometimes coated with a sponge gasket.
Moreover the Active-Carbon Cabin Filter has a layer of active carbon able to retains unpleasant smells, exhaust harmful fumes, benzene, etc.
FILTERING MEDIA
Particle cabin filter elements are manufactured with synthetic filtering media called NONWOVEN (not cellulose ). To guarantee an high filtering media efficiency, the non-woven material, during its manufacture, is subjected to a processing of electrostatic effect by means of high voltage, which guarantees the total retention of micro-particles harmful to the human organism.
Active carbon cabin air filters is produced with a particular media where the activated carbons are sandwiched between two outer layers.
Cabin Filter media guarantees a retention rate of 100% of particles greater than 3 micron and not less than 90% of 0.5 to 2 micron particles.
The filtration rating is about 0.5 to 3 micron.
MULLER FILTER
