The CODIP pump is operated by compressed air supplied through an independent automatic air distributor to one side of a flat rubber air-diaphragm. This diaphragm is deflected, thus displacing the inert liquid inside the pump casing. In its turn the inert liquid transmits the pressure uniformly to the tubular diaphragm without any mechanical stress.
The rubber diaphragm therefore operates with an air pressure on one side, and an equally and opposite fluid pressure on the other side, so that this diaphragm is hydrodynamically balanced.
Similarly, the tubular diaphragm (which is "the heart" of the system) operates with medium inside, and inert liquid outside, at the same internal and external pressure also this diaphragm is hydrodinamically balanced. This means that the differential pressure acting on the tubular diaphragm walls is always zero, therefore completely eliminating any diaphragm stress for which results in an extremely long tubular diaphragm life.
The dry suction lift capability ranges from 1 m RP 20 to 4 m RP 150 and Duplex pumps with standard ball check valves, subject to operating conditions (specific gravity, suction pipework, viscosity, temperature, vapour pressure and stroke frequency ).
An optional check valve with P.T.F.E. shuttle replacing the standard ball achieves higher suction lifts (3,5 m RP 20 to 5 m RP 60 Duplex based on water at 18°C) and ensures positive seating.
The fact that the process fluid is prevented from entering an exhaust port by means of a secondary containment is another important feature of the CODIP concept which addresses the continuously growing demand for sealless pumps and ensures zero leakage in the event of a diaphragm failure.
The P.T.F.E. tubular diaphragm safely handles most corrosive liquids, both hot and cold.