States that automatic flow-limiting (self-actuated) valves have been in the HVAC market for some time. Their operating principle is based on fluid momentum and Bernoulli's theorem. Basically, they absorb pressure to keep the flow rate constant. Outlines the application and interaction of these valves with other system components, when installed in hydronic distribution networks. Analyses a simple, multilevel piping network consisting of a pump, connecting piping, an automatic temperature control valve, a coil and balancing valves.

KEYWORDS: year 1996, Valves, regulating, networks, water flow, heating, ventilation, flow rate, air conditioning, automatic