A dual filtration system consists of a coarse filter of felt on steel gauze followed by a fine ceramic filter with a pore diameter of 15 to 20 mm ensures that minimal fatigue debris reaches the contact area. The temperature of the oil leaving the test washer contact zone is measured by means of thermocouples situated in the oil throwout path. The oil condition-viscosity, acidity, moisture content, specific gravity, and particle content-is monitored regularly and maintained within strict limits.
Dual Flow Vacuum Valve is limited by a small orifice. These are used only in non-porous parts or for slightly porous lightweight parts. It uses a blow-off pulse of compressed air to break the vacuum and release the part more quickly. The non-sealing cups will leak and cause the associated dual-flow valves to close to orifice flow only.
Dual-fuel burners are of fan-assisted or forced-draught type and incorporate the features of both natural gas & oil burners necessary for the safe and efficient combustion of either fuel. The burner mechanisms and their control are able to achieve the correct fuel/air ratios for firing with either fuel and at any firing rate that the burner is capable of. Dual fuel burners are configured with an oil nozzle down the center of and concentric with the gas nozzle. These burners are designed to operate typically on either gaseous or liquid fuels. They are used for economic reasons, where the customer need to switch between a gaseous fuel like natural gas and a liquid fuel like oil. These burners operate on one fuel or the other and sometimes on the fuels simultaneously. Dual-fuel burners efficiently fire gas or any grade of light or heavy oil with quick changeover.