Pressurised spray can with variable vol. - has inner container sliding in spring connected outer container

摘要

The outer container is closed by a lid contg. a valve and at the top a support (2) for a spring (5). The inner container has filling and discharge valves, as well as a pressure or delivery tube (4). A piston (7) separates the liq. from the propellant gas. The spring, which connects the inner and outer containers, ensures that the delivery pressure and delivery vol. are constant during discharge. A heat source, projecting into the pressure container, can be used to heat the pressurised gas. USE/ADVANTAGE - For aerosol or piston operated spray cans, with constant gas pressure.