Product Overview | Butterfly Valves
1122A butterly valves control and balance flow rates by way of a swing thru disc design operated with a manual dial. For motorized versions, see 1126 series valve bulletin. 1122A Butterfly Valves feature a knurled knob locking device that prevents accidental changing 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 (see picture to the right). 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. Caution: 1122A Series Valves are not designed for tight shutoff, use an approved ball, plug, needle, or other valve for tight shutoff.
knob with socket head screw 5⁄32 " hex size
SPECIFICATIONS
SELECTION
Medium
Air, natural gas, propane NPT threaded and ISO 7-1 threaded (M versions)
1122A valves to be sized for a recommended pressure drop across the valve of approximately 1/5 to 1/6 of the total system pressure drop.
Connection Sizes
Rotation angle
0-90°
Maximum Temperature Minimum Temperature
200 °F (93 °C) -H 700 °F (371 °C)
-5 °F (-15 °C)
Maximum Pressure
25 psi (1.7 bar) (-0 to -4 sizes) 15 psi (1.0 bar) (-5 to -8 sizes)
MATERIALS OF CONSTRUCTION
Component
Material
6061-T6 Aluminum -H uses 304 SST 303 Stainless Steel
Body
Shaft
Disc
Steel
FKM -H uses graphite rings
Shaft Seal
Bulletin 1122 Page 2
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