Ambient And Design Temperature; Working Principle - OBL X9 Series Operating Manual

X9 Series metering pumps
... follows
In case of special execution machines the constructive variations may differ from the above mentioned codes.
5.3

AMBIENT AND DESIGN TEMPERATURE

Unless differently agreed with the customer, the ambient design temperature range "Ta" of X9 pump can be:
–10°C Ta +40°C:
GB
–10°C Ta +60°C:
The table below illustrates the maximum allowed temperature of pumped fluid based on pump head material.
HANDLED FLUID
Max. temperature
Only on metallic pumpheads can be coupled to a warming jacket. The table below illustrates the maximum allowed temperature of
warming fluid (additional code RF).
NOTE: During periodic inspection always check that temperatures respect limits here indicated !
The values contained in these tables are applicable equally for each of the allowable ambient temperatures "Ta".
5.4

WORKING PRINCIPLE

The L series version X9 hydraulic diaphragm metering pumps are all double hydraulic diaphragm (sandwich) with diaphragm
rupture detector. The "basic" detector is a pressure gauge placed directly on the head. During normal pump operation, it must
indicate "zero (0) pressure", confirming that the diaphragms are intact.
NOTE: THE DETECTOR PRESSURE GAUGE DOES NO INDICATE THE PUMP OPERATING PRESSURE !
X9 hydraulic diaphragm pumps consist of a pumphead made of material (plastic or metallic) chemically compatible with the fluid to be
handled and coupled to a mechanism body that incorporates the transmission reduction gear, the plunger thrust system and the flow
rate adjustment system.
The pump sectional drawing is usually attached to the present operating manual. In case of it is not attached or missing, see the point
"Hydraulic system oil filling" to consult pumphead section drawing or at least contact OBL customer service to receive an updated copy.
They are normally powered by an electric motor through a reduction gear type "endless screw and worm wheel" joined to a duct
mechanism. The latter consists of a connecting rod system with variable eccentricity which determines the axial reciprocated movement
of the plunger; both the mechanisms are in oil bath.
When moving, the connecting rod generates both pump phases. During the discharge phase the connecting rod forces the plunger to
move forward, putting pressure on the oil chamber hydraulic circuit and determining the controlled deformation of the diaphragm,
subsequently the fluid in the pumphead moves to the discharge pipeline. During the suction phase the connecting rod pulls the plunger
back which, creating a vacuum on the oil chamber, deforms the diaphragm again and causes the entrance of fluid in the pumphead.
The check valve on the pumphead controls input and output of fluid from the pumphead, determining flow direction.
A safety valve is installed on the oil chamber hydraulic circuit to safeguard the pump. If an excess of pressure exceeding its calibration
is detected during operation, the valve opens, discharging a quantity of oil in the expansion tank equal to the displacement of the
plunger.
The flow rate adjustment system controls the volume of fluid pumped by varying the connecting rod eccentricity and, therefore, plunger
return stroke length. Standard adjustment is manual with graduate knob and linear vernier; alternatively (upon request), an automatic
adjustment system can be applied (see "Flow rate adjustment system").
X9 pumps fall into the family of alternative volumetric pumps characterized by adjustable displacement.
The construction material of external components ensures high impact protection. With the exception of pumphead, the external pump
surfaces are treated to ensure high protection against corrosion. Metal parts are assembled to ensure correct and proper grounding.
Page 10
...MC motors supplied by the customer to OBL to be assembled on the pump
...M0 pump supplied to the customer WITHOUT a motor.
Standard temperature range for all pump types
Standard temperature range for only some pump types
"STANDARD" pumpheads characteristics
METALLIC
material pumphead
+100 °C
HANDLED FLUID
Max. temperature
METALLIC
material pumphead
Copyright © - OBL Metering pumps - All rights reserved
PLASTIC material pumphead
PVC (P) PVDF (S)
+40 °C +60 °C
"RF" pumpheads characteristics
WARMING FLUID
Max. temperature
≤+100 °C +130 °C
Operating manual
PTFE (T) PP (PP)
+30 °C +40 °C
File: UT-4336 – Rev.0