A cutting nozzle for a gas torch, such as a postmixed oxy-fuel gas torch, comprising a body with a torch end adapted to engage the gas torch, a discharge end, and a peripheral surface between the torch end and the discharge end. The body has a plurality of bores for respectively conducting fuel gas, preheat oxygen and cutting oxygen through the nozzle, each of the plurality of bores extending from the torch end and terminating in a respective discharge orifice at the discharge end of the body. A set of the plurality of bores are preheat oxygen bores connected to an oxygen source at the torch end for discharging the preheat oxygen at the discharge end. A plurality of air bores each have an inlet orifice located on the peripheral surface of the body and open to an air source, and a discharge orifice in or proximal to the discharge end.

Provided herein are flashback arrestors disposed proximate the head of a cutting torch for restricting flashback into the torch head. In one approach, a torch assembly is provided including a torch head having a gas passageway formed within a body of the torch head, and a tip coupled to a distal end of the torch head. In some approaches, the tip has a proximal end and a distal end, the distal end of the tip including an exit orifice and the proximal end of the tip having a set of openings in fluid communication with the gas passageway for delivering a gas towards the exit orifice. The torch assembly further includes a filter coupled to the tip at the proximal end thereof, the filter disposed between the set of openings and the gas passageway for restricting flashback into the torch head.

Provided herein are flashback arrestors disposed proximate the head of a cutting torch for restricting flashback into the torch head. In one approach, a torch assembly is provided including a torch head having a gas passageway formed within a body of the torch head, and a tip coupled to a distal end of the torch head. In some approaches, the tip has a proximal end and a distal end, the distal end of the tip including an exit orifice and the proximal end of the tip having a set of openings in fluid communication with the gas passageway for delivering a gas towards the exit orifice. The torch assembly further includes a filter coupled to the tip at the proximal end thereof, the filter disposed between the set of openings and the gas passageway for restricting flashback into the torch head.

A cutting nozzle assembly and associated method of making same includes a nozzle having a central bore extending therethrough along a longitudinal axis through which an associated cutting gas is discharged. A plurality of spaced fuel gas bores are arranged around the central bore, and preheat passages are arranged around both the central bore and the fuel gas bores. A retaining nut receives at least a portion of the nozzle therein, and the retaining nut includes a shroud extending axially outward from a discharge end of the nozzle. At least one of an inner surface of the shroud and the additional preheat passages are angled inwardly toward the longitudinal axis. The fuel gas bores and the preheat passages each have the same cross-sectional dimension, and twice the number of preheat passages as fuel gas bores are provided.

A cutting nozzle assembly and associated method of making same includes a nozzle having a central bore extending therethrough along a longitudinal axis through which an associated cutting gas is discharged. A plurality of spaced fuel gas bores are arranged around the central bore, and preheat passages are arranged around both the central bore and the fuel gas bores. A retaining nut receives at least a portion of the nozzle therein, and the retaining nut includes a shroud extending axially outward from a discharge end of the nozzle. At least one of an inner surface of the shroud and the additional preheat passages are angled inwardly toward the longitudinal axis. The fuel gas bores and the preheat passages each have the same cross-sectional dimension, and twice the number of preheat passages as fuel gas bores are provided.

A gas flow safety device, such as a flashback arrestor, with flow indication includes a main body and a safety element. The main body has a flow capacity and is configured to direct a flow of gas from an inlet to an outlet. The safety element is disposed within the main body and prevents at least one of flashbacks and reverse flows of gas. The flashback arrestor may also include at least one of: an indicator assembly that automatically provides an indication when the flow capacity of the main body diminishes by a predetermined amount; and a movable internal mechanism that causes the apparatus to provide an indication when the flow capacity of the main body diminishes by the predetermined amount.

Provided is a torch including a body having a first portion and a second portion angled relative to the first portion, a control knob at a top of the second portion for adjusting a flow of fuel through the torch, a trigger at a top of the first portion that is movable from an off position to an on position to at actuate an igniter, and a burn tube extending from an end of the second portion away from the first and second portions.

Provided is a torch including a body having a first portion and a second portion angled relative to the first portion, a control knob at a top of the second portion for adjusting a flow of fuel through the torch, a trigger at a top of the first portion that is movable from an off position to an on position to at actuate an igniter, and a burn tube extending from an end of the second portion away from the first and second portions.

Provided is a backfire preventing gas cutting apparatus for cutting a workpiece by heating the workpiece using a preheating flame and injecting cutting oxygen and comprises: a nozzle bundle which is coupled with a valve bundle wherein the nozzle bundle comprises: a tip having a flame outlets formed at the front end thereof; and a head frame coupled with the tip. An injecting unit is formed on the inside of the head frame for enabling the laminar flow of the fuel gas through the injecting flow path by increasing a flow rate of the preheating oxygen introduced into the injecting flow path.

Provided is a backfire preventing gas cutting apparatus for cutting a workpiece by heating the workpiece using a preheating flame and injecting cutting oxygen and comprises: a nozzle bundle which is coupled with a valve bundle wherein the nozzle bundle comprises: a tip having a flame outlets formed at the front end thereof; and a head frame coupled with the tip. An injecting unit is formed on the inside of the head frame for enabling the laminar flow of the fuel gas through the injecting flow path by increasing a flow rate of the preheating oxygen introduced into the injecting flow path.