the sinusoidal pressure wave to obtain therefrom a differential pressure signal and applying the pressure signal to a control circuit to position a valve in the combustible fuel supply any interruption in combustion within the chamber causes a cessation of the differential pressure signal and closes the control valve the apparatus of the invention includes as the rectification facility a dynamic check valve having a funnel member which is longitudinally disposed in a conduit communicating between the pulse combustion chamber and a pressure responsive transducer the latter being operatively connected to maintain the fuel supply valve open during combustion and to close the fuel supply valve upon failure of combustion within the chamber application_number US 67279676 A description referring now to fig1 the pulse combustion system is illustrated as including a pulse combustion chamber 10 in the form of a generally elongated vessel having a discharge end 12 and bearing at its opposite end 14 combustible fuel and oxygen containing gas supply means generally indicated at 16 the combustible fuel supply 18 includes conduit 21 communicating with a source of a combustible fuel such as accumulator vessel 22 through a combustible fuel check valve 24 the combustible fuel which can be any suitable material such as natural gas gasoline kerosene benzene etc is supplied to accumulator 22 through a control valve 26 the source of the oxygen containing gas which can be any gas containing molecular oxygen such as air and the like is generally indicated at 28 and comprises a blower 30 which receives ambient air and discharges the air into the air check valve 32 communicating with conduit 34 in the fuel and air supply system 16 the respective check valves for the.