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5.4
PRESSURE CONTROL VALVE MOUNTED ON THE PUMP
Pump group unit
The pump has a pressure control valve, mounted on the
manifold unit on the right side of the pumping
elements. It is calibrated by turning the bypass pressure
adjustment nut:
clockwise (increase of pressure)
anticlockwise (decrease of pressure)
Once the bypass has been calibrated, the position of the
pressure adjustment nut is locked using a lock nut. It is
important to bear in mind that line inversion is
controlled by closing the contacts of the pressure
switch. Adjusting the pressure switch provides an
operating pressure which is lower than the maximum
pressure controlled by this valve
.
Photo 6
5.5 MAXIMUM AND MINIMUM GREASE LEVEL INDICATORS
Standard grease pumps have two types of level:
Minimum capacitive level;
Maximum visual level (float).
5.5.1 Minimum laser level
The minimum level is produced by a laser probe. The capacitive probe is normally closed when it reaches the minimum level the
probe indicates a lack of lubricant. The minimum level contact is indicated by a light signal on the control panel. In addition it
controls any command for the pump to automatically refill the tank.
5.5.2. Maximum visual level (floating)
The phase for loading the lubricant into the tank is carried out by the operator, with an appropriate pump. Once the maximum
level of lubricant has been reached, the small rod which indicates that the tank is full intervenes.
5.6 INDICATORS OF MINIMUM AND MAXIMUM OIL LEVE
Standard oil pumps have two types of level:
Minimum and maximum level float;
Maximum visual level (float).
5.6.1 Minimum and maximum level float
A probe rod with dual float mounted on the pump cover provides a reading of the minimum oil level (reserve) and the maximum
level (which allows the automatic refilling of the tank to be halted).
The minimum level contact is indicated by a light signal on the control panel. In addition it controls any command for the pump
to automatically refill the tank
5.7
STIRRING PADDLE FOR GREASE AND OIL (STANDARD PERFORMANCE)
Four tanks are provided with a capacity of 30 and 100 kg. (22 – 66.1 – 220.4 lb) two for oil and two for grease.
The tanks have a stirring paddle and scraper as standard, and they must not be dismantled when they are being assembled and
replaced. Under the stirring paddle a galvanized steel mesh with 0.5 mm holes (0.02 in.) is provided as standard. In this way the
pump is protected from any foreign bodies which might be inadvertently present during the tank refilling process.
5.8
PRESSURE GAUGE
The pressure gauge is of the glycerine filled type, so it is protected from any pressure leaks which might damage its functioning.
It is mounted directly in the manifold group (positioned on the front of the pump).
5.9
ELECTRICAL CONTROL PANEL
“DROPSA” electrical control panel has been designed to provide a system complete with all the controls necessary for automatic
functioning controlled by safety signals from centralized lubrication installations. The primary voltage is 400 VAC and 50 Hz, the
other voltages are on request.
Extractible pumping elements
Bypass pressure
adjustment
Photo 6
