Gespasa BDP Instruction Manual

1. INTRODUCTION
The vane pumps use a rotor with sliding blades that push the liquid behind each blade from the inlet opening and move it to
the pumping chamber. When the rotor turns, the liquid is transferred among the vanes to the outlet opening being
discharged, while the pumping chamber is compressed. Each blade applies a positive mechanical thrust to the liquid it has.
The blade contact with the chamber walls is kept by three forces:

The centrifugal force of the rotor rotation.

Thrust rods that act between the opposed pairs of vanes.

The liquid pressure that gets in the slots of the vanes and acts in their top.
Each revolution of a pump displace a constant volume of fluid. The pressure variation has a minimum effect. The losses
and turbulences are reduced at minimum while the high volumetric output is guaranteed.
They are heavy duty pumps, made of cast iron and stainless steel, with single-race grease-lubricated ball bearings and
isolated from the pumping product by mechanical seals with nitrile or Viton joints, according their needs.
All the pumps has built in a safety valve. They are perfectly adapted to the truck service and transport, in general,
tank load and unload, storage of fuel or any other non-corrosive liquid free of particles in suspension.
TECHNICAL DATA
BDP
MODELS
Maximum pump speed ( rpm)
Maximum viscosity¹
Maximum temperature²
Maximum differential pressure
Maximum working pressure
(1) The viscosity shown is in SSU (cP). cP= cSt for a fluid with a density of 1 kg/dm³.
(2) The maximum surface temperature of the pump in potentially explosive atmospheres is 135 ºC.
BDP · HIGH FLOW PUMPS
INSTRUCTION MANUAL
1"
1,400
PUMP SIZE
1.5" 2.5" 3"
740 640 640
20,000 (4250)
356 ºF (180 ºC)
125 psi (862 kPa)
175 psi (1207 kPa)
4"
520
P P a a g g e e 1 1 o o f f 2 2 4 4