Instantaneous water heater which includes safety devices separately or in combination to prevent the explosion of the heat exchanger in the event of an excessive heating of the water in the heating coil and to shut-off the flow of gas to the burner

A gas control valve for an instantaneous water heater, the water heater including devices for regulating and controlling hot water temperature, devices for lighting a pilot flame, a burner, a heat exchanger and a heating coil, said control valve comprising:

• a body,
• a settling chamber for separating gas entrained solid particles disposed in a lower portion of said body;
• a temperature regulation knob coupled to said body;
• a gas flow modulating valve coupled to said regulation knob, said gas flow modulating valve including an aperture, setting a size of said aperture being controlled by a first cam mounted on a shaft of the gas control valve, said first cam actuating against a second complementary cam affixed to a body of said gas flow modulating valve;
• a thermostatic actuator coupled to said modulating valve;
• a temperature sensor operatively associated with said thermostatic actuator;
• means for preventing explosion of the heat exchanger in event of excess heating of the water in the heating coil;
• and
• means for interrupting gas flow to the burner when ambient air around the water heater has an oxygen deficiency, said interrupting means being actuated by the pilot flame.

A gas control valve for an instantaneous water heater, the water heater including devices for regulating and controlling hot water temperature, devices for lighting a pilot flame, a burner, a heat exchanger and a heating coil, said control valve comprising:

• a body,
• a settling chamber for separating gas entrained solid particles disposed in a lower portion of said body;
• a temperature regulation knob coupled to said body;
• a gas flow modulating valve coupled to said regulation knob;
• a thermostatic actuator coupled to said modulating valve;
• a temperature sensor operatively associated with said thermostatic actuator;
• means for preventing explosion of the heat exchanger in event of excess heating of the water in the heating coil;
• and
• means for interrupting gas flow to the burner when ambient air around the water heater has an oxygen deficiency, said interrupting means being actuated by the pilot flame, said gas flow interpreting means including atmosphere analyzer means disposed in a pilot flame nozzle and a thermocouple, said thermocouple being heated by said pilot flame, said thermocouple generating a voltage to energize a solenoid control valve, the pilot flame moving outward of said analyzer means when the atmosphere is oxygen deficient so that said thermocouple cools down and said solenoid control valve is de-energized.

A gas control valve for an instantaneous water heater, the water heater including devices for regulating and controlling hot water temperature, devices for lighting a pilot flame, a burner, a heat exchanger and a heating coil, said control valve comprising:

• a body,
• a settling chamber for separating gas entrained solid particles disposed in a lower portion of said body, said solid settling chamber including a screen filter positioned upstream of an inlet gas passage controlled by a solenoid control valve;
• a temperature regulation knob coupled to said body;
• a gas flow modulating valve coupled to said regulation knob;
• a thermostatic actuator coupled to said modulating valve;
• a temperature sensor operatively associated with said thermostatic actuator;
• means for preventing explosion of the heat exchanger in event of excess heating of the water in the heating coil;
• and
• means for interrupting gas flow to the burner when ambient air around the water heater has an oxygen deficiency, said interrupting means being actuated by the pilot flame.