Compressor Discharge Temperature Gauge
The pressure gauge monitors the temperature of the air/fluid mixture leaving the compressor unit.
The oil level gauge monitors the fluid level in the receiver/sump. The sight glass is on the side of the receiver/sump tank. The proper oil level is halfway of the sight glass.
Note: DO NOT OVERFILL. Check the level when the compressor is shut down.
Opens the electrical circuit to shut down the engine when the discharge temperature exceeds normal operating range. This circuit will flag an alarm and shutdown the machine.
The pressure regulators open a pressure line between the receiver tank and the inlet control valve allowing the inlet control valve to regulate air delivery according to demand.
Indicates required service of the main oil filter and flags an alarm when the pressure drop through the main oil filter is excessive.
Air Filter Restriction Indicator
The indicator will flag an alarm in the cab that indicates required servicing of the air filter primary element.
Separator Scavenge Line Sight Glass
The sight glass is used to indicate flow of oil going back to the compressor from the oil pickup in the receiver tank. When the compressor is running at full load, oil flow should be visible in the sight glass. There may be little to no flow when the compressor is running unloaded.
Compressor control valve controls the maximum receiver pressure. The control valve is a normally open valve so if there was failure will fail to safe. Therefore, solenoid is energized to allow the compressor to load or make air. If the compressor control solenoid valve is energized, this valve will close. Pilot signal is stopped causing the poppet valve to close and opens the running blow-down valve . The signal will purge off over orifice of the control cylinder. The set point for pressure control is a processed value on the ECM. Pressure is monitored on both the wet and dry pressure transducers. Wet is primary pressure control, with dry side as a secondary input.
The compressor run valve pilots the compressor inlet valve open when compressor is in the run state and pressure in receiver tank is below the set point. The pressure is monitored by both receiver pressure transducers and. When energized the compressor run valve opens to allow pilot pressure to port 2 on the control cylinder inlet. The pilot needs to effectively over come the spring valve in port 1 to shift piston forward allowing the butterfly valve to open.
The system blow-down valve is a 2 way normally opened valve that is piloted closed from the same pilot line that opens the oil stop valve. When the compressor first starts up, the system blow-down valve (50) is piloted closed allowing the receiver to build up pressure. When the compressor is shut down, the system blow-down valve opens and vents any remaining receiver pressure. The system blow-down valve will stay open until the compressor starts up again.
The shutdown blow-down valve vents receiver tank pressure to the atmosphere at compressor shutdown.
The running blow-down valve is a 2 way normally closed valve that is piloted open by the system pressure regulators. The blow-down valve opens when the regulator pressure is reached and the air volume drawn through the closed inlet is vented to atmosphere.
The discharge check valve cuts off the reverse flow of air/fluid mixture through the compressor discharge system during shutdown.
The oil stop valve cuts off flow of oil to the compressor unit at compressor shutdown, and allows flow of oil to the compressor unit on start-up.
The minimum pressure valve maintains required minimum pressure in the receiver tank. This valve restricts the air discharge from the receiver when pressure falls below the minimum operating pressure. However, full flow is allowed at normal operating pressures.
The safety relief valve opens receiver tank pressure to the atmosphere should pressure inside the receiver tank exceed system rating.
The thermal bypass valve is designed to maintain operating temperature, and is used for fast warm-up at start-up and to eliminate condensation during operation.
The Poppet Inlet Valve is on the intake of the compressor. The Poppet Inlet Valve gives precise control, is maintenance free, and minimizes dust entry because it is a sealed system.
The Spiral Valve Regulator is located inside the Compressor Control Panel. The function of the Spiral Valve Regulator is to reduce compressor volume by 50% by rotating a Spiral Valve. This opens a series of bypass ports at the end of the compressor rotors and reduces the effective length of the compression chamber, producing less air.
The Drill Air Ball Valve is located after the Minimum Pressure Valve and controls air going to the Drill Bit. Air is supplied to open the valve from the manifold inside the Compressor Control Panel.
Interstage Safety Relief Valve (High-Pressure System Only)
The Safety Relief Valve is located between the first and second stage on a two stage air compressor. The safety relief valve opens the receiver tank pressure to atmosphere should pressure inside the tank exceed the safety relief valve setting.
Pressure Regulators (High-Pressure System Only)
The Pressure Regulators are in various locations around the Compressed Air System. These Pressure Regulators are used to control system pressures throughout the air system.
Pressure Relief Valve (High-Pressure System Only)
The Pressure Relief Valve is located inside the compressor control panel and is set at 100 Psi.
When the compressor starts making air, a pilot signal is sent to the oil stop valve to allow lubrication. Pilot signal is sent to the shutdown blow-down valve to close this valve and allow the system to make air. At start-up the valve plate in the butterfly valve will be held closed by air pressure. As the compressor starts, the vacuum created will draw the valve plate slightly, and a small volume of air will enter through a vent in the valve plate. As the compressor builds air, pressure will increase at port 2 gradually opening the valve plate further against the spring pressure.
The system reaches a set pressure with the main air valve turned off. When the receiver tank reaches a set pressure, the system pressure regulator will open. The regulator opening sends a pilot signal to both the running blow-down and port 1 on the control cylinder . Pressure at port 1 will close the butterfly valve plate. The running blow-down valve vents excess air into atmosphere including the volume through the vent in the valve plate.
When the engine is shut down, and the compressor stops making air. The discharge check valve is forced closed by the air pressure in the receiver tank . The pilot line for both the oil stop valve and the shutdown blow-down valve is supplied from the compressor discharge before the check valve. At this point, the signal is lost. The oil stop valve closes and prevents the compressor rotor chamber from being flooded with oil. The shutdown blow-down valve opens and dumps system air to atmosphere.