Plastic Air Operated Double Diaphragm Pumps

Corrosion-resistant plastic construction with broad chemical compatibility for aggressive fluid transfer

Plastic air operated double diaphragm pumps are designed for transferring corrosive, abrasive and chemically aggressive fluids in industrial processes where metallic pumps may not provide suitable chemical resistance. Manufactured with non-metallic wetted components such as polypropylene (PP), conductive polypropylene and PVDF, these pumps are commonly used with acids, alkalis, solvents, cleaning chemicals, wastewater and other demanding process fluids. The appropriate pump body, diaphragm, valve ball and valve seat materials should always be selected according to the chemical composition, concentration and operating temperature of the fluid. In chemical processing plants, plastic AODD pumps are widely used for unloading chemicals from drums, intermediate bulk containers and storage tanks. They can also transfer fluids between processing vessels, feed chemicals into mixing systems and circulate liquids through filtration equipment. Their air-powered design provides adjustable flow control by regulating the air supply and eliminates the need for an electric motor at the pump. Before operation in a potentially explosive atmosphere, users must confirm that the complete pump installation and all accessories comply with the applicable safety and grounding requirements. Plastic diaphragm pumps are also suitable for water and wastewater treatment applications. Typical duties include transferring treatment chemicals, filter-press feed, sludge handling, sump drainage and moving contaminated water containing suspended solids. The diaphragm operating principle allows the pump to handle fluids containing particles without using a rotating mechanical seal. Self-priming capability makes the pump practical for emptying tanks and containers, while dry-running capability helps protect the pump during intermittent transfer operations. Actual priming height, particle size and flow performance depend on the selected model, fluid properties and installation conditions. In electroplating, surface treatment and electronics manufacturing, plastic AODD pumps can transfer acids, alkalis, etching solutions, cleaning fluids and plating chemicals. Their non-metallic wetted construction helps reduce corrosion risks when handling compatible aggressive liquids. PVDF models may be selected for applications requiring greater chemical or temperature resistance, while polypropylene models provide a practical solution for many general chemical-transfer duties. Material compatibility must be verified before each application because chemical resistance can change with temperature, concentration and exposure time. These pumps are also used in lithium battery material processing for transferring compatible cathode precursor slurry, electrolyte-related chemicals, wastewater and cleaning liquids. For slurry applications, the selected diaphragm and valve configuration should be evaluated according to viscosity, solids concentration, particle size and abrasiveness. Correct pump sizing is important to maintain stable flow, reduce excessive cycling and extend diaphragm service life. Additional applications include transferring inks, adhesives, water-based coatings, detergents, fertilizers, ceramic slurry and process chemicals. Plastic AODD pumps can be installed for drum unloading, tank-to-tank transfer, batching, circulation, filtration and equipment cleaning. Flow can be adjusted to suit changing process requirements, and the pump can operate against a closed discharge for limited periods without requiring a separate bypass system, subject to the specified air-pressure and system limits. OVELL plastic AODD pumps are available in multiple connection sizes and configurations for different flow-rate and installation requirements. Options include polypropylene and PVDF pump bodies together with a selection of diaphragm, ball and seat materials. When choosing a pump, users should consider fluid compatibility, viscosity, temperature, solids content, required flow rate, discharge pressure, air quality and connection size. Before installation or maintenance, isolate the compressed-air supply, release all system pressure, drain the pump safely and follow the applicable workplace procedures. Contact OVELL Pump with the fluid name, concentration, temperature, required flow and operating pressure for assistance selecting a suitable plastic air operated double diaphragm pump.

Excellent chemical resistance, self-priming operation, dry-running capability, adjustable flow control and non-metallic wetted construction