.[.The cooking appliance (1) having a control panel (2) is equipped with one or more gas flow (Q) regulating valves, wherein the rotary regulating plug (6) is provided with various peripheral through holes (16-19). The control knob (9) being interchangeable for fitting to the actuating shaft (7), is chosen from the two units available, one and the other permitting different angular limit positions of the regulating plug (6) for the supply of a constant minimum gas flow Qmin, adjusted each one for a different type of gas N gas or LP gas. The outlet conduit (5) of the valve is equipped with a further injector nozzle (21,23) for adjusting a constant gas flow Qmax to be fed into the conduit (25) of the correspondent burner, when the cooking appliance is supplied with a LP gas..]. .Iadd.A valve adapted to regulate the flow of both a natural gas and a liquefied petroleum gas. According to one implementation the valve includes a valve body having a rotatable regulating organ positioned between a valve inlet and a valve outlet, the valve outlet having a first restriction and a second restriction successive to the first restriction, the first restriction including a first hole calibrated to provide a given maximum flow rate of the natural gas at a first pressure in the absence of the second restriction, the second restriction removeably attached to the valve outlet, the second restriction including a second hole calibrated to provide a given maximum flow rate of the liquefied petroleum gas at a second pressure..Iaddend.

An adjustable valve includes a main valve body having a first end portion, an oppositely disposed second end portion, and an endless cylindrical wall extending therebetween. Oppositely disposed flanges, including respective flange apertures, are formed in the endless cylindrical wall for accepting cylindrical fluid conduits. A fluid flow volume is positioned within the main valve body and disposed between the aperture flanges. A plug is controllably insertable through the first end portion into the valve to at least partially obstruct the fluid flow volume. An at least partially hollow cylindrical drum is rotatably connected within the main valve body, wherein the drum has a pair of oppositely disposed drum apertures formed through a wall thereof. The drum is rotatable to at least partially align the pair of oppositely disposed flange apertures to define an unobstructed fluid flow path through the valve body.

A valve device capable of fast switching and fine adjustment of flow includes a valve seat unit. The valve seat unit has a chamber therein. The chamber is provided with a switch unit and a fine adjustment unit. The switch unit is used to open or close the valve device. The fine adjustment unit is used to adjust the flow passing the valve device. The user may individually operate the switch unit to quickly open and close the valve device and to operate the fine adjustment unit to adjust the flow passing the valve device so as to enhance the convenience of use.

An adjustable valve includes a main valve body having a first end portion, an oppositely disposed second end portion, and an endless cylindrical wall extending therebetween. Oppositely disposed flanges, including respective flange apertures, are formed in the endless cylindrical wall for accepting cylindrical fluid conduits. A fluid flow volume is positioned within the main valve body and disposed between the aperture flanges. A plug is controllably insertable through the first end portion into the valve to at least partially obstruct the fluid flow volume. An at least partially hollow cylindrical drum is rotatably connected within the main valve body, wherein the drum has a pair of oppositely disposed drum apertures formed through a wall thereof. The drum is rotatable to at least partially align the pair of oppositely disposed flange apertures to define an unobstructed fluid flow path through the valve body.