Abstract: A plasma arc torch with improved sealing of connections between fluid passages of adjoining parts of the torch, means for reducing current leakage through a control fluid, and an improved pilot arc electrical assembly, includes a main torch body and an insulator body which abut and each of which has a plasma gas passage and a control fluid passage which extend to the abutting end faces of the bodies and are aligned thereat. Connections between the aligned plasma gas passages are made via coupling tubes each having a first portion inserted into a receiving portion of the passage in the main torch body and a second portion inserted into a receiving portion of the passage in the insulator body. Each inserted portion includes a pair of O-rings spaced apart along the length of the tube for sealing the connection.

Abstract: A plasma arc torch with improved sealing of connections between fluid passages of adjoining parts of the torch, means for reducing current leakage through a control fluid, and an improved pilot arc electrical assembly, includes a main torch body and an insulator body which abut and each of which has a plasma gas passage and a control fluid passage which extend to the abutting end faces of the bodies and are aligned thereat. Connections between the aligned plasma gas passages are made via coupling tubes each having a first portion inserted into a receiving portion of the passage in the main torch body and a second portion inserted into a receiving portion of the passage in the insulator body. Each inserted portion includes a pair of O-rings spaced apart along the length of the tube for sealing the connection.

Abstract: A plasma arc torch with improved sealing of connections between fluid passages of adjoining parts of the torch includes a main torch body and an insulator body which abut and each of which has a plasma gas passage and a control fluid passage which extend to the abutting end faces of the bodies and are aligned thereat. Connections between the aligned plasma gas passages are made via coupling tubes each having a first portion inserted into a receiving portion of the passage in the main torch body and a second portion inserted into a receiving portion of the passage in the insulator body. Each inserted portion includes a pair of O-rings spaced apart along the length of the tube for sealing the connection. An elongate insulating conduit is sealingly received within the control fluid passages of the insulator body and main torch body, and extends through the main torch body into a control fluid connector tube.