A hose peristaltic pump uses rollers or sliding shoes to
compress the hose thus driving liquid forward, and then the automatic
relaxation of the hose creates a vacuum which pulls fluid in. This process periodically
continues and continuously pump fluids.
A hose peristaltic pump simply consists of three parts: a
hose, a peristaltic pump head, and a driver body. The hose inner and outer
diameters are required to match the housing requirement of the pump head. A
peristaltic pump head includes casing, rollers, and a main rotor carrying
rollers. A driver body is the essential drive part with an electric motor enclosed
in a plastic or metal case. The motor rotating speed and direction are
controllable by a digital or analog program.
To properly use a
hose peristaltic pump, the following points should be considered:
- The selected hose material should be compatible with the
fluid being pumped. Otherwise, the fluid would get contaminated by the
dissolved hose material, and the hose operating life would be shortened. Also, the operating temperature is critical
for the compatibility of the hose and fluid.
- The discharge side should be always open when a positive
displacement pump is in operation. Otherwise, there is risk of hose rupture due
to the over-pressure.
- A ruptured hose should be replaced immediately. Otherwise,
liquid leaking from the rupture may damage the peristaltic pump head including
rollers, casing and the rotor.
- The rubber hose may become stressed or out of shape by the
repeating squeezing, which may influence the pumping flow rate because the flow
rate is affected by the relaxation strength of the hose. To recover the pump
efficiency, a fresh part of the hose should be shifted into the roller track by
adjusting the shims, or replaced with a new hose.
- A strainer may be installed to the inlet of the hose if
there are large and hard solid particles. Otherwise, these particles would be
drawn in and rip the inside of the hose.
- The hose should be flushed with water after use. Otherwise,
the fluid contained in the hose could possibly cause deterioration of the hose material.
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