Valve leak detecting method and combustion equipment

A valve leak detecting method through combustion equipment comprising:

• a first valve that is connected to a pipe of a fuel supplying system and controls a fluid flow rate within the pipe;
• a second valve that is connected in series to the pipe on the downstream side of the first valve and controls a fluid flow rate within the pipe;
• a pressure detecting portion that detects pressure within the pipe between the first and second valves;
• and
• a leak detecting portion that performs leak detection for the first and second valves, based on a pressure within the pipe, detected by the pressure detecting portion, by controlling the first and second valves individually, wherein:
• the leak detecting portion performs:
• a pressure setting step for setting the pressure within the pipe between the first and second valves to no less than a specific threshold value or to less than a specific threshold value, by closing the first and second valves individually when the combustion equipment stops combustion;
• a first threshold value evaluating step for evaluating whether or not the pressure within the pipe, detected by the pressure detecting portion after a first time interval has elapsed, is at least the specific threshold value, after the pressure within the pipe has been set to at least the specific threshold value in the pressure setting step;
• a second valve normalcy evaluating step for evaluating the second valve as operating properly if the evaluation in the first threshold value evaluating step was that the pressure within the pipe is at least the specific threshold value, and for evaluating that the second valve is faulty if the evaluation was that the pressure within the pipe is less than the specific threshold value;
• a second threshold value evaluating step for evaluating whether or not the pressure within the pipe, detected by the pressure detecting portion after a second time interval has elapsed, is less than the specific threshold value, after the pressure within the pipe has been set to less than the specific threshold value in the pressure setting step;
• and
• a first valve normalcy evaluating step for evaluating the first valve as operating properly if the evaluation in the second threshold value evaluating step was that the pressure within the pipe is less than the specific threshold value, and for evaluating that the first valve is faulty if the evaluation was that the pressure within the pipe is no less than the specific threshold value.