Boiler temperature control system

Claim 1

A DEVICE FOR CONTROLLING FLOW TO A SWIMMING POOL BOILER COMPRISING A HOUSING HAVING A FIRST, A SECOND AND A THIRD CHAMBER ARRANGED IN LINE THEREIN WITH AN ANNULAR OPENING BETWEEN SAID FIRST CHAMBER AND SAID SECOND CHAMBER AND BETWEEN SAID SECOND CHAMBER AND SAID THIRD CHAMBER, MEANS FOR INTRODUCING WATER INTO SAID FIRST CHAMBER, MEANS FOR DIRECTING WATER THROUGH A HEATING MEANS TO SAID THIRD CHAMBER AND AN OUTLET COMMUNICATING WITH THE SECOND CHAMBER, A FLOW GOVERNOR HAVING VALVE MEANS COOPERATING WITH EACH ANNULAR OPENING; SAID GOVERNOR HAVING A THERMOSTATIC POWER ELEMENT RESPONSIVE TO TEMPERATURE OF WATER ENTERING SAID THIRD CHAMBER TO SIMULTANEOUSLY MOVE SAID VALVE MEANS CONTROLLING FLOW FROM SAID INLETS TO SAID OUTLET, A BY-PASS CHAMBER FORMED IN SAID HOUSING THROUGH WHICH SAID FIRST AND SECOND CHAMBERS COMMUNICATE, MANUALLY POSITIONED VALVE MEANS IN SAID BY-PASS CHAMBER.