Pressurized sprayer

Claim 1

A DISPENSER COMPRISING IN COMBINATIN: A TANK FOR A LIQUID SUBSTANCE TO BE EXPELLED, SAID TANK HAVING A BOTTOM AND A VALVE CONTROLLED OUTLET THROUGH WHICH THE LIQUID SUBSTANE IS EXPELLED UNDER THE INFLUENCE OF A PROPPELLANT AT A PREDETERMINED PRESSURE; A SEPARATE POWER CAPSULE HAVING A LOWER PART AND BEING MOUNTED INTERIORLY OF SAID TANK SUCH THAT THE LOWER PART THEREOF IS ADAPTED TO BE IMMERSED IN SAID LIQUID SUBSTANCE AT THE BOTTOM OF THE TANK AND HAVING A DISCHARGE END COMMUNICATING WITH THE INTERIOR OF THE TANK, SAID CAPSULE HAVING WALLS OF GOOD THERMAL CONDUCTIVITY, SAID CAPSULE ADAPTED TO CONTAIN SAID PROPELLANT AT A PRESSURE ABOVE PREDETERMINED PRESSURE AND IN A LIQUID-VAPOR PHASE; A REGULAR VALVE AT THE DISCHARGE END OF SAID CAPSULE FOR CONTROLLING THE INTRODUCTION OF THE PROPELLANT IN SAID CAPSULE INTO THE TANK INTERIOR WHEN THE PROPELLANT PRESSURE IN THE TANK FALLS BELOW A PREDETERMINED VALUE; HEAT TRANSFER MEANS BETWEEN THE CAPSULE AND THE LIQUID SUBSTANCE FOR MAINTANINING THE TEMPERATURE OF THE PROPELLANT DURING THE OPERATION OF SAID VALVE AT SUBSTANTIALLY THE TEMPERATURE OF SAID LIQUID SUBSTANCE; AND FURTHER HEAT TRANSFER MEANS FOR MAINTAINING THE TEMPERATURE OF SAID VALVE AT SUBSTANTIALLY THE TEMPERATURE OF THE PROPELLANT.