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Here are some useful information about Double-Diaphragm Air-Operated Pumps
What is an Air-Operated Double Diaphragm Pump?
A Double-Diaphragm Pump (Air-Operated Double Diaphragm) is a type PD pump. The pumping chambers are filled alternately and then discharged using flexible diaphragms. To create the pumping action, compressed air is alternately fed into and vented out of air chambers located on opposite sides.
AODD pumps can be used in transfer applications. They can handle a variety of fluids, including sludges and slurries as well as abrasive, shear sensitive, and sludge-sensitive fluids. They are reliable, robust, and easy to maintain, but they can also be noisy and prone to icing.
What is the working principle of an AODD pump?
An AODD pump is a fluid-moving device that uses the back-and-forth motion (strokes) of two flexible membranes, or diaphragms, mounted on a common shaft. While diaphragm pumps may be driven directly with the shaft connected to a motor, an AODD Pump uses compressed air with a sophisticated distribution network that directs the air alternately between two chambers on opposite sides of the diaphragms.
What are the main benefits and features of an AODD pump
AODD pumps are virtually leak-free. The only thing that can cause leakage is failure of one or both of the diaphragms. Regular replacement of diaphragms is part of a regular maintenance program. Follow the manufacturer's instructions. An AODD pump has a lower wear rate than a mechanically driven pump. This is due to the compressed air supply's pressure balancing.
AODD pumps can handle abrasive, viscous fluids such as sludges and slurries. They are also ideal for handling shear-sensitive fluids due to their gentle pumping action. Four internal check valves can be either a cone, ball, or flap design. Flap designs are more susceptible to wear and seal better than those made of ball valves. Flap-type valves can become fatigued at the flexing point due to their hinged design. Ball valves wear evenly because the ball can rotate freely during operation and settle in a different place on the seat. Flap-type check vales have the advantage of being able to pass larger solids that are contained in the pumped fluid more easily.
An AODD pump is free from moving parts or internal seals that require cooling and lubrication. It can run dry indefinitely with no damage. AODD pumps can be self-priming, and some have a suction lift up to 8m.
Because they use compressed air rather than electricity, AODD pumps can be used in hazardous locations. An AODD pump can also be submerged if the air vent is not below the liquid level.
What are the limitations to an AODD pump
An AODD pump's efficiency and stability are dependent on the compressed air supply. The compressed air supply must have the same pressure or higher than the fluid being pumped. This limits the use of AODD pump to low pressure applications (typically 120psi). Pump speed is affected by the differential pressure between the air supply fluid and the pumped fluid. Pumping speed increases when the compressed air supply pressure is increased or decreased. Additional flow control and pressure control may be required if a constant flow is needed.
An AODD pump's power and control is provided by the air distribution system. It is simple, inexpensive and easy to maintain. In some cases, however, expelled air may need to be filtered to remove oil and other contaminants.
Poorly designed air distribution systems can lead to icing. Air distribution systems that are poorly designed can cause cooling. In extreme cases, this can lead to ice buildup around the vents and within the distribution system. You can reduce the risk of constrictions by installing heaters, reducing humidity, and lowering the pressure.
A diaphragm's cyclic action creates pulses in discharge. The fluid accelerates during compression and slows down during suction. Two cylinders can be used to reduce the pulsing of an AODD pump. One cylinder is in compression and the other is suction. Sometimes, however, damping or smoothing can be used downstream. A flexible connection at the pump outlet can reduce leakage and loose connections. Pulsing can cause vibrations that are harmful to the discharge system.