Diesel Filters

In addition to filtering out contaminants, diesel filters are used to separate water contained in the diesel fuel. Since water is heavier than diesel, it collects in the water accumulation chamber of the diesel filter. After filtration, the lighter diesel fuel flows to the interior of the filter towards the outlet.

Types of Diesel Filters

Cloth Type (Primary)

• Consists of several layers of cloth wound over a layer of link cloth on a perforated metal tube
• Flow direction - From outside to inside
• Filtered fuel collects in the centre tube and is delivered to the pump
• Removes non-dissolving impurities like dust, foreign particles etc.

Coil Type (Secondary)

• Consists of a corrugated filter paper around a central tube with alternative layers glued
• Flow direction - Radial and axial
• Dual particles are held in the v-shaped folds

Star Type (Secondary)

• Formed out of pleated filter paper
• Paper is pleated along the breadth to provide a framework for filter dust
• Flow direction - Radial from outside to inside
• Filtered fuel collects at the centre and is delivered to the pump
• Dust particles are deposited on the filter paper or settle down as sediments at the bottom of the filter housing
• Removes impurities of less than 2 microns

Advantages

• Integration of water separation, fuel heating and fuel cooling in one module
• Pressure stability at very high injection pressures
• Special filter media achieves high storage capacity and separation of fine particles
• Effective water separation from fuel prevents corrosion damage