Patent ID: 7857233

Claim:
A method for regulating temperature in a system, the method comprising: receiving, at a building management system, information concerning stem positions of a plurality of control valves, the plurality of control valves each being associated with at least one of a plurality of terminals, each of the plurality of terminals being in communication with a supply header line of a hydronic system, the hydronic system comprising production equipment supplying a fluid to the header line; determining, based on the information concerning stem positions of the plurality of control valves, whether changes need to be made to the production equipment of the hydronic system, wherein the changes to the production equipment of the hydronic system change at least one parameter of the fluid being supplied to the supply header line of the hydronic system; and making a change to the production equipment in response to determining that changes need to be made, the change to the production equipment yielding a difference in the at least one parameter of the fluid, wherein: making a change to the production equipment includes at least one of the following: changing a temperature of a chiller supplying the fluid to the supply header line of the hydronic system; changing a temperature of a heater supplying the fluid to the supply header line of the hydronic system; or changing a speed of at least one pump supplying fluid to the supply header line of the hydronic system, and at least one of the plurality of control valves is positioned between at least one of the plurality of terminals and a return header line and maintains a substantially constant temperature of fluid provided to the return header line.