Air operated diaphragm pumps are easy to maintain, providing a cost-effective solution for many applications. Hermetically sealed and self priming they maintain variable expulsion pressure without requiring complex operation.
The elastomer diaphragm flexes between two pumping chambers creating positive or negative pressure differences that can be used to move fluid – sucked in during discharge and pushed back during suction. This cycle is repeated continuously.
Fluid Transfer Innovation
Air operated double diaphragm pumps (AODD) are a versatile pumping solution that can transfer a wide range of liquids and viscosities. They are inherently safer than other pump types because they operate without electrical power and can be specified for ATEX zones, hygienic applications and 3A certifications.
The two diaphragms are linked through a central section that houses an air valve. The air valve directs compressed air towards the back of diaphragm number one causing it to develop a press stroke pushing the liquid out of the pump. At the same time diaphragm number two performs a suction stroke. This is accomplished by atmospheric pressure forcing the liquid to the suction ball valve. Flow is adjusted by adjusting the pump speed. This pumping motion is similar to the inhalation and exhalation concept of human breathing.
Versatile gia bom mang khi nen Pumping Solution
The positive displacement nature of AODD pumps ensures that they can be used to handle liquids across a vast range of industries. As long as there is access to a compressed air supply the pump can be installed wherever it is required.
AODD pumps are seal-less, so there is no need for complex systems to manage flow rates and pressures. The diaphragm elastomers can be selected to suit the fluid, with different durometers available to provide varying levels of resistance to chemicals and environments. The shape and molded design of the diaphragm also affects flow and pressure levels as well as lifespan. The choice of materials is crucial for a successful application. Choosing the right material for your application will help to reduce overall operating costs.
Advantages
Air Operated Diaphragm Pumps (AODD) are driven by compressed air, eliminating the risk of electricity contacting a product. They can be used in applications where it is unsafe or impossible to use electric pumps because AODD’s do not emit sparks, flashing, short circuits or leakage.
These pumps are ideal for transporting shear sensitive liquids, and are often the best choice for applications where a product needs to be pumped from below the surface. They are also very portable and can be made into a compact configuration.
The wetted construction materials can vary, with a choice of 316L Stainless Steel, Neoprene, Viton or PTFE for the diaphragms and balls. Depending on the application, a specific material selection may be needed for optimum chemical compatibility. These pumps are intrinsically safe and can be ATEX certified for use in hazardous areas.
Pump Applications Across Industries
Air operated diaphragm pumps can be used to move a variety of liquids ranging from high viscosity chemicals through to foods and fuel. They are able to cope with solids up to 40% by weight and can be adjusted to suit flow rates and pressure requirements for each installation.
During the suction cycle compressed air fills one of the inner chambers which pushes out the opposite diaphragm towards the liquid chamber and lifts the bottom valve ball to draw in fluid. Once this is complete the air switches and the process repeats, alternating between the two diaphragms creating a double acting pumping action.
Typically, these pumps are fitted with stroke counters for integrating into PLC systems to monitor pump performance and control maintenance schedules. They can also be supplied with internal pulsation dampeners to minimise water hammer and vibration.
Maintenance and Reliability
Unlike most pumps, air operated double diaphragm pumps (AODD) are able to run dry and do not require any electrical power. This makes them the workhorses of the industrial pump world. However, they must be properly cared for to ensure their long-term efficiency and reliability.
Regular inspections can help prevent common problems such as a damaged diaphragm or valve which could significantly reduce your pump’s life. The material your diaphragm is made from (EPDM rubber or PTFE) will affect its lifespan and stiffness.
Checking the position of manual valves on suction and discharge during maintenance can also help prevent issues such as a blocked pump. Insufficient lubrication or improper mounting of the pump can also cause a variety of other problems.
