Manual butterfly valve for Gas and Air

1122 Manual Butterfly Valves feature a knurled knob locking device that prevents accidental shifting of valve setting. It is easily released, then relocked, if a new setting is desired. To discourage unauthorized tampering with the valve setting, the knob can be replaced with a socket head screw as the locking device. The socket head screw is conveniently supplied in the side of the knob.

Manual Butterfly Valves can be used on gas as well as air. The locking device makes them advantageous as limiting orifice valves, often preferable to fixed orifices, which are difficult to select in advance or change in the field.

In most cases, an 1122 Valve should be the same pipe size as the burner connection it serves and/or other items in the line. If valve capacity is critical, reducing fittings could create enough additional pressure drops to cause a problem.