Gas regulator fitting

A gas regulator fitting for a gas-fired heating device, the gas-fired heating device including a main burner, the gas regulator fitting comprising:

• a housing (1) defining a gas flow path in a gas-conducting area of the housing (1);
• a main valve accommodated in the housing (1) and disposed in the gas flow path;
• at least one second valve accommodated in the housing (1) and disposed downstream of the main valve in the gas flow path;
• a switching system accommodated in the housing (1) and operative to regulate the volume of gas flowing to the main burner;
• the switching system comprising a longitudinally moveable tappet (7), a temperature-sensitive element (8) and a setting element (17);
• the setting element (17) comprising an aperture, wherein the temperature-sensitive element (8) is coupled to the setting element (17) and operates to alter the position of the longitudinally movable tappet (7);
• the switching system further comprising a threaded element (12) and a latching part (14), the threaded element (12) in threaded engagement with the housing (1), the latching part (14) rigidly secured to the threaded element (12), the latching part (14) including a projecting stop element (16) extending in a direction opposite the threaded element (12), the setting element (17) coupled to the latching part (14) such that the projecting stop element (16) protrudes into the aperture, wherein a removable locking device (22) secures the setting element (17) to the threaded element (12).