Operations & maintenance manual – ASTRA evo (DDE)
ARGALAIR 2020 | Rev. 6
16
In particular: the overpressure that is created in the chamber (A) (fig.1) closes the suction valve and opens
the discharge valve, so that the fluid is sent to the discharge pipe. The valve opens as soon as the pressure
to which it is subjected exceeds the one existing in the discharge pipe. Simultaneously in the chamber (B),
the pressure decrease causes the opening of the suction valve and the closing of discharge valve.
The flow rate is given exclusively by the product of the number of cycles per unit of time and the volume
aspirated, and then relaunched, at each cycle, so it is adjustable in an extremely precise manner.
This type of pumps allows to confer heads directly proportional to the supply pressure.
A PUMPING CYCLE
The pneumatic distribution system sends compressed air behind one of the two diaphragms (A), which
deforming causes a reduction in volume in the chamber than pushes the fluid towards the discharge circuit.
Simultaneously, the opposite diaphragm (B) is in the intake phase since it is dragged by the shaft that
connects it to the other diaphragm (A) that is under pressure; air present behind it is discharged into the
environment through the flow rate regulator present on the pump, while a pressure drop is created in the
fluid chamber which sucks the fluid from the suction circuit. When the diaphragm (A) under pressure,
reaches the stroke limit, the distributor switches the two inputs to the chamber on the diaphragms air side,
putting diaphragm (B) under pressure and diaphragm (A) in discharge.
When the pump reaches its original starting point, each diaphragm has carried out one air discharge stroke
and one fluid discharge stroke. This sequence of movements makes up a complete pumping cycle.
1. SAFETY: WARNINGS FOR TRANSPORT – INSTALLATION – USE – STOP OF THE
PUMP
0.1
TRANSPORT
•
Mount
pressure plugs
, furnished with the pump, on the hydraulic connections and keep them for a
future use.
•
Lift the pump without mechanical stress (shocks, jolts and vibrations can cause permanent
damage).
•
For transport on irregular roads, cushion the pump with suitable support plane.
•
Blows and impacts may damage parts that are important to machine operation and safety.
SUPPLIED AIR
EXHAUSTED AIR
FLUID DRAWN
FLUID DELIVERED
Summary of Contents for ASTRA Evo DDE 030
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