Oxy-cutting machine with mass flow controlled supply to the cutting burner

An Oxy-cutting machine, comprising:

• a cutting burner;
• separate supply line for supplying heating gas, heating oxygen and cutting oxygen to said cutting burner;
• a pressure reducer on said heating gas supply line;
• a pressure reducer connected to said oxygen supply lines and having a first outlet connected to said cutting oxygen supply line and a second outlet connected to a heating oxygen mass flow control valve;
• and
• said heating oxygen mass flow control valve includes a body having a gas inlet, a first chamber in communication with said gas inlet, a second chamber, a gas outlet in communication with said first chamber, and a valve passage connecting said second chamber and said gas outlet, a flexible diaphragm positioned between said first chamber and said second chamber and preventing unrestricted flow of gas between the two chambers, a compensation opening positioned in said diaphragm and permitting restricted flow of gas through the diaphragm between the two chambers, a cock opening connecting said first chamber and said outlet, a cock piece connected to an underside of said diaphragm and positioned to be received into said cock opening, spring means urging said cock piece into said cock opening, a first end of said spring means in communication with an upper surface of said diaphragm, and adjustable spring stop means positioned above and in communication with a second end of said spring means opposite said end in communication with said diaphragm for adjustably positioning said second end of said spring means, whereby gas pressure differential between said first chamber and said second chamber will urge said diaphragm to move against the spring means and lift said cock piece out of said cock opening to allow gas to flow from said lower chamber to said gas outlet.