New Filters for Oil and Petrol Engines
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TO meet varying demands for commercial-vehicle engines, C. G. Yokes, Ltd. Vokesacess House, 95-97, Lower Richmond Road, London, .W.15, has produced a standardised filter, which, with optional filtering 'elements, can be used for filtering petrol, fuel oil or lubricating oil.
A solid drawn-steel cup-shaped container is held up to the light-alloy diecast dome by means of four swing bolts with wing nuts. For incorporation in a petrol-feed line, one or more layers of copper gauze in a finned cylindrical formation are used for the filtering element, or, alternatively, one of the company's other special elements can be employed.
For filtering oil-engine fuel, the Yokes patent five-ply medium is used, this comprising three plies of galvanized steel gauze with, interposed, two plies of special fabric. This element can be washed in paraffin or petrol, and has a finned or corrugated section to give a big area. It is inexpensive and can, therefore, be replaced, say, yearly.
For use with lubricating oil the element has much deeper fins, so as to give the greater area necessary for the thicker liquid, and it is composed of special fabric mounted on the outside of a gauze frame of star formation. This, again, is cheap to replace. A similar type of filter in a perforated brass container is available for immersion in the crankcase sump.
An ingenious filtering medium of new and patented design has just been produced at the Yokes works. This consists
The latest Vokes filters for commercial vehicles. (1) The new wound. cable filter with (inset) an explanatory sketch of one of the coils. (2) The standardized model equipped for lubricating oil and (3) for Diesel oil. (4) The oil filter for immersion in the crankcase sump.
of numerous tubes made from spirally wound galvanized steel wire of rectangular section, having slightly rounded edge s. The wire is actually coiled in compression, so that there is no apparent gap between the coils. In fact, it is only the minute irregularities in the surface of the wire that allow any gas or liquid to pass through.
A new patent filter, consisting of 120 i-in. tubes of this design in a 10-in, by cylindrical container weighing 8-10 lb., is now produced for the fuel systems of oil engines, and could be used for lubricating oil, petrol or air. The liquid or gas is drawn into the i-in. tubes and filtration is claimed to be so good that ethyl petrol can actually be deeolorized, whilst dust, water and oil are removed from gases. The filter tubes are flexible and the swirling of liquid around them causes dirt to fall to the base of the container, which, of course, is quickly detachable. being made of solid-drawn steel.