Diaphragm Pump

Overview

An air-operated double-diaphragm pump moves fluid using compressed air instead of a rotating shaft, which lets it handle abrasive slurries, viscous liquids and shear-sensitive products that would damage or clog other pump types. Two diaphragms share a common shaft: as compressed air pushes one diaphragm out on its discharge stroke, the shaft pulls the opposite diaphragm in on its suction stroke, so the pump delivers flow on every stroke. It is seal-less and self-priming, runs dry without damage, and stalls safely against a closed discharge.

How it works

The heart of the pump is the Center Section, an air-motor body housing the connecting shaft and a pilot valve. The Air Valve Assembly spool alternately pressurizes one chamber and exhausts the other; at the end of each stroke the pilot valve shifts the spool to reverse direction, and spent air leaves through the Exhaust Muffler. Each Diaphragm Assembly separates air from fluid and is clamped to the shaft between inner and outer plates.

On the wet end, the two Fluid Cap chambers bolt over the diaphragms to form the pumping cavities. Four Ball Check Valve ball checks, two per chamber, control direction: a chamber on its suction stroke draws fluid through its lower check while its upper check holds, then reverses on the discharge stroke. The Inlet Manifold feeds both lower checks and the Outlet Manifold collects from both upper checks. A Pulsation Dampener smooths the inherently pulsing discharge, and the pump sits on a Foot Mount. An optional Stroke Controller counts strokes for batching and run-dry detection.