Compact, magnetic recirculating pump for wide-range temperature and pressure operation

Abstract

This article presents a design for a simple, inexpensive magnetic recirculating pump. It consists of a piston and cylinder with a separate check valve which can be either normally open or normally closed. The interior offers minimal surface area for adsorption and, with proper dimensioning and material selection, the pump can operate over wide pressure and temperature ranges. A prototype model with cylinder dimensions 22.2 mm o.d.×15.9 mm i.d. ×6.35 cm circulates at 26 cm³/sec (10 cm of H₂O differential pressure). The dimensions of the prototype allow an operable pressure range of 0⩽P⩽703 kg cm⁻² at room temperature. The temperature range is 100⩽T⩽500 K.