Figure 2-3. Air Compressor Assembly Controls and Indicators
Air Compressor Assembly. (Refer to Figure 2-3).
Spring-Loaded Pressure Relief Valve (1). An emergency device that relieves air pressure exceeding 200 psi.
Without this device the tank could explode.
Ball Valve (2). Shuts off all air to pumps.
Adjustable Pressure-Actuated Mechanical Control (3). Stops the compression of air when the receiver tank
pressure has reached 175 psig and starts the compression of air when the tank pressure has dropped to 140
psig. Air in excess of 175 psi is released into the atmosphere.
Spring-Loaded Interstage Pressure Relief Valve (4). Protects the low pressure cylinder of the air compressor in
the event of failure of the high pressure cylinder.
Shut-off Valve (5). When closed, will shut off air to tank and isolate tank from the adjustable pressure-actuated
mechanical control (6)
Automatic Unloading Device (6). Protects the engine from starting against either tank
pressure or compression in the compressor cylinders by relieving cylinders of air.
Condensate Removal Valve (7). Completely drains the tank of all moisture. Drain daily.
Air Receiver Tank (8). Stores compressed air created by compressor.