Using this trainer the function of a normal expansion vessel is examined and a pressure-volume characteristic recorded. The expansion vessel is filled with water from a supply tank. The pressure is generated using a small compressor and adjusted
using a pressure regulating valve. The amount of water taken up by the expansion vessel is read on a scale on the supply tank.
Learning Objectives / Experiments
Function and operation of a diaphragm expansion vessel
Displacement volume of an expansion vessel as a function of the pressure
Specification
Trainer on heating systems and plumbing
Small compressor for pressure generation
Measuring tank with scale
Expansion vessel
Manometer
Ball valve in connecting pipe between measuring tank and expansion vessel
Adjustable safety valve
Pressure controller for air with overpressure protection
Cutaway model of an expansion vessel
Technical Data
Expansion vessel
Volume: 2L
Filling pressure: 1.4bar
Measuring tank
Volume: 3.75L
Max. pressure: 2.5bar
Compressor
Power consumption: 65W
Max. flow rate: 11.5L/min
Max. pressure: 2bar
Final vacuum: 240mbar
Pressure controller for air, adjustable: 0.06...2bar