Diagrampumpar

Diagrampumpar, commonly known as diaphragm pumps, are a type of positive-displacement pump that uses a flexible diaphragm to move liquids. The diaphragm is driven by a mechanical linkage, compressed air, or hydraulic pressure, which causes the pump chamber to expand and contract. This action draws fluid in through an inlet valve and pushes it out through an outlet valve. The design provides a sealed, contact-free fluid path on the drive side, which makes diaphragm pumps suitable for handling aggressive, viscous, or particulate-laden fluids, depending on the diaphragm material.

There are several drive methods. Mechanical diaphragm pumps use a crank or cam-driven mechanism to flex the diaphragm. Air-operated diaphragm (AODD) pumps use a dual-diaphragm arrangement controlled by compressed air, enabling dry running and safe operation in flammable or hazardous environments. Hydraulic diaphragm pumps use fluid pressure to actuate the diaphragm. Each type offers different advantages in terms of flow rate, pressure, maintenance, and suitability for hazardous areas.

Construction and materials vary with application. The essential components include the diaphragm, pump housing, inlet and outlet valves, and a drive mechanism. Diaphragms are made from elastomers or polymers such as nitrile, EPDM, neoprene, Viton, or PTFE, chosen for chemical compatibility and temperature resistance. Wetted parts and housings are often stainless steel, aluminum, or engineering plastics to match service conditions. Some designs include leak-sensitive seals and safety features to protect against diaphragm rupture.

Applications span multiple industries. Diagrampumpar are used in chemical processing, food and beverage, pharmaceuticals, cosmetics, water and wastewater treatment, and mining. They are favored for handling viscous fluids, shear-sensitive substances, slurries, and liquids with particulates, as well as for systems requiring gentle pumping and isolated containment.