Integral regulated hand torch

Claim 1

A fuel flow control assembly for use in conjunction with a portable gaseous hydrocarbon-burning torch having a delivery tube and burner head, and a cannister containing a supply of liquid petroleum fuel under pressure, said assembly comprising: a. a body having a passage extending therethrough for feeding fuel from the cannister to the delivery tube, said passage including an enlarged portion thereof providing an expansion chamber; b. first valve means mounted on said body upstream of said Expansion chamber and operative to open and close said passage to fuel flowage therethrough; c. second valve means in said passage downstream of said first valve means and upstream of said expansion chamber to vary the volume of fuel passing through said passage; d. spring means contacting said second valve means to force the latter toward an increased fuel flow rate position; and e. a diaphragm extending across said expansion chamber to form a flexible wall thereof, said diaphragm contacting said spring means and said diaphragm being exposed to fuel pressure variations occurring in said expansion chamber and flexible in response thereto, flexure of said diaphragm in response to increased fuel pressure in said expansion chamber being operative to lower the force of said spring on said second valve means to thereby lower the volume of fuel flowing into said expansion chamber.