Gardner Denver APEXVS7-11A, Руководство по эксплуатации и обслуживанию

Страница: 32 / 71

13-25-603 Page 31
Never paint, lubricate or alter a pressure relief valve. Do not plug vent or
restrict discharge.
Operation of the unit with improper pressure relief valve setting can result in
severe personal injury or machine damage. Ensure properly set valves are
installed and maintained.
Oil Level Gauge - This gauge is located on the oil reservoir and indicates the oil level. See “Oil Level
Gauge”, Figure 5-4, page 44, for how to read oil level.
Minimum Discharge Pressure/Check Valve - An internal spring-loaded minimum pressure valve is used
in the final discharge line to provide a positive pressure on the coolant system of the compressor even if
the air service valve is fully open to atmospheric pressure. This valve also functions as a check valve to
prevent back flow of air from the shop air line when the unit stops, unloads, or is shut down.
The valve incorporates an orifice which, when air is flowing through it, maintains pressure in the oil
reservoir. A spring-loaded piston valve senses air pressure on the upstream (reservoir) side of the valve.
When the system pressure rises, the spring is overridden and the valve opens to full porting.
The valve does not require adjustment. If the Valve fails to function, check the valve for dirt, burrs, worn
o-rings or seals. See the Parts List 13-25-503, for a listing of the kits available for rebuilding or replacing
the valve. Repair kits are available from your local authorized Gardner Denver distributor.
Inlet Valve This device is located at the intake flange of the compressor, and allows the compressor to
remain pressurized and ready for quick response to air demand when the latter is not running.
During compressor operation, the underside of the poppet is vented to atmosphere via a 3-way solenoid
valve, allowing it to fall (open) and feed fresh air to the compressor inlet. An internal self-actuated blow-
off valve helps to quickly vent the air signal trapped below the poppet. During stopped operation modes
(e.g., commanded from the key pad or initiated by protective shutdowns), the 3-way solenoid valve feeds
sump air to the underside of the poppet, forcing it upward (closed) and blocking-off the compressor
intake. The internal blow-off valve is also forced closed by the sump air signal.