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4.1.2 Operating
principle
Arranged in a pump casing a gear pump has two gears that mesh to provide its pumping action through
rotation in opposite senses. The gears are mounted on two shafts which, in turn, are supported in the pump
casing and the pump cover. One of the two gears is driven through a shaft, with the former also driving
the second gear in mesh. As the space between any two teeth opens a pressure below atmospheric is
generated, drawing the fluid into the pump and advancing it between the tooth spaces and the casing wall.
In the area where the teeth re-mesh the fluid is forced from the tooth gaps and into the outlet. Thus, the fluid
can also be delivered against a higher pressure.
The figure above shows the liquid as it advances through the pump; the point where the teeth come out of
mesh governs the phase of the liquid entering between the rotors and is, therefore, physically located
close to the suction zone. The liquid is carried between the teeth and the steady and the discharge opening
developing as the teeth come into mesh eject the liquid.
The permanent-magnet coupling guarantees operation that requires no maintenance, it is without leakage,
and prevents air entrainment, e.g., when product is drawn in from a vacuum.
4.2 Designation
4.2.1 Marking of the pump
SAXMAG V 80-2 G - K +Y
Magnetic coupling
V6,V12,V20,V25-2,
V30-2, V60-2, V80-2
second shaft
extension
G all grey cast iron,
with carbide plain
bearing
K stainless steel with
carbide plain bearing
+R:
Pump casing with heating jacket (or cooling jacket). From V50-3 with flange or flange
with groove to DIN 2512 (+RN).
+R2: Heating jacket on casing cover. Specifically used on pumps made of S.S.
+Y:
Pressure relief valve (bypass).
+YY: Double block and bleed valve (bypass).
Summary of Contents for V 100-2
Page 1: ...Operating Manual V Series Internal Gear Pumps with Magnetic Coupling ...
Page 34: ...Page 34 ...
Page 35: ...Page 35 ...