21 NOMENCLATURE
TOP AIR: The top air line is an added feature to the standard blow down line. Using the same plumbing to the top of the tank as the blow down, it is used to add air pressure to the tank on top of the product. Some products need top air pressure to optimally discharge. The top air supply is
valve. Not all trailers have a top air line.
CHECK VALVES: Check valves are installed upstream of the discharge to protect against air reversing in the lines. installation technique and orientation is important for a check valve to work properly. These valves can contain springs and gaskets that require maintenance. Keep these valves in proper working order so they can properly protect the air system.
DISCHARGE VALVES:
the handles are extended for easier access. The disc, stems, seats, and seals of these discharge valves are in contact with the product should be properly matched for the product to prevent contamination. GRAVITY DISCHARGE: Sometimes products are discharged by gravity and provision may be provided such as a drop tee at the bottom of the hoper allowing product to empty straight out the bottom of the trailer. Other designs might use a gravity discharge valve with a dust cover to do this same operation. DISCHARGE: Discharge lines may run the length of the trailer connected to all the hoppers or it might be a single discharge in the case of single hopper trailers. The discharge outlet is typically a cam and grove outlet that the operator attaches the discharge hose to and also connects to a silo or some other form of product storage Y-BRANCH DISCHARGE: This design can typically be found on a single hopper trailer. It allows air to be introduced to the product down stream of the discharge valve. This design includes a check valve at the y-branch. SILENCER: Silencers are optional devices installed in the air system to help quiet the noise of the air movement upstream of the product introduction points. These can be mounted on the truck or trailer and can be inlet or outlet silencers. Typically silencers are mounted on the trailer down stream of the blower. PRESSURE RELIEF DEVICE: A pressure relief device is part of the air system and protects the tank from being over pressurized.
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